Roll gap floating method and device for double-roll thin strip process

Abstract

The present invention provides a roll gap floating method and device for a twin-roll thin strip process. During the production process, relative motion between the two rolls is controlled to cause the roll gap to float, stabilizing the process and / or improving the quality of the blank. Compared with conventional methods, the present invention's technical solution facilitates real-time control; for materials with a narrow two-phase region, it can promote the formation of a kiss angle, utilizing the kiss angle to prevent the pressure in the molten pool from connecting with the unsolidified core area of ​​the blank exiting the molten pool, thereby avoiding defects such as "ridges" and "snake eggs"; for materials with a wide two-phase region, it can increase the molten pool pressure, inhibit the rapid development of the kiss angle, and reduce the peak molten pool pressure during long-range shear thinning interface collapse, thereby preventing various process stability issues such as side seal plate leakage, side seal plate damage, tape jamming, and tape breakage caused by excessively high pressure peaks. It also reduces the probability of problems such as cracks, wrinkles, and edge waves.

Description

Technical Field

[0001] The present invention relates to the technical field of a double-roller thin strip process, and in particular to a roller gap floating method and device for the double-roller thin strip process. Background Art

[0002] The twin-roll thin strip process was proposed by British metallurgist Bessemer around 1850. For reference, see the following literature: "On manufacture of continuous sheets of malleable iron and steel direct from fluid metal" (Journal of Metals, 1965); "Numerical Simulation of the Fluid Flow, Heat Transfer, and Solidification during the Twin-Roll Continuous Casting of Steel and Aluminum" (Metallurgical and Materials Transactions B, 2016, P740-748).

[0003] The twin-roll thin strip caster is also called a twin-roll caster, a twin-roll continuous caster, a twin-roll casting and rolling machine, a twin-roll thin strip machine, a twin-roll casting and extrusion machine, etc. The blanks produced by the twin-roll thin strip caster are not necessarily just thin strips. "Thin strip" is only a customary name formed over a long period of time in the technical field involved and belonging to the patent application document of this invention (hereinafter referred to as "the field"), and "thin strip" includes thin strips, tubes, bars, plates, or other blanks with special cross-sectional shapes.

[0004] In the double-roll thin strip process, the components constituting the molten pool include two crystallization rollers arranged oppositely and in parallel, and the "crystallization rollers" are also called roller bodies; the two crystallization rollers are respectively called the first roller body and the second roller body, and the "first roller body and the second roller body" are referred to as the "two roller bodies" for short; the axis of rotation of the roller body is referred to as the roller shaft; the roller shaft of the first roller body is called the first roller shaft, and the roller shaft of the second roller body is called the second roller shaft, and the roller shaft is a virtual straight line, and the "first roller shaft and the second roller shaft" are referred to as the "two roller shafts" for short; the surface of the roller body that is in direct contact with the material in the molten pool is called the roller working surface, and the "roller working surface" is referred to as the "roller surface". Ordinary technicians in the relevant field can directly and unambiguously know the "roller surface"; the surfaces at both ends of the roller body that are perpendicular to the roller shaft are called "end surfaces". When a contact side sealing plate is used, part of the "end surface" of the roller body is in periodic or non-periodic direct contact with the contact side sealing plate; a gap is left between the two roller bodies, and the minimum distance between the two roller bodies is called the roller gap; the two roller bodies The minimum distance between the two rollers is called the roll gap opening; the roll gap opening can be less than 1 mm; the roll gap opening can also exceed 10 mm; normally, for thin steel strips, the roll gap opening is in the range of 0.5 to 3 mm; the midpoint of the roll gap is called the Nip point; when the molten pool depth is large, a side sealing device is required to support the formation of the molten pool; normally, the contact side sealing device is made of refractory material and needs to be in close contact with the end of the roller under a certain pressure; a cooling water channel can be provided inside the roller; during the preparation process, the two rollers rotate in opposite directions, and material needs to be added to the molten pool. The material is moved out of the molten pool from the roll gap under the driving force of the rollers to become a blank with certain specifications; the material entering the molten pool includes liquid metal, which can enter the molten pool through a flow distribution device; the material may include solid matter, for example, when preparing a multi-layer material using a double-roll method and a solid-liquid composite method, solid matter needs to be added to the molten pool.

[0005] The molten pool geometry and technical basis of the twin-roll thin strip process are completely different from those of conventional continuous casting processes. In the twin-roll thin strip process, the geometry of the rollers causes the molten pool to gradually narrow along the direction of roller rotation. The molten pool is wedge-shaped, and the area of ​​the free liquid surface of the molten pool is dozens of times, or even more than a hundred times, the area of ​​the molten pool outlet. Over the years, major economies have invested in research on the twin-roll thin strip process. Although a few steel companies have commercialized a few types of steel, they still have stability problems when preparing steel strips, and the types of steel that can be prepared are very few. This is because, in the absence of experimental means, the field firmly believes that the growth law of the solidified shell in the molten pool is as follows: Figure 1 As shown, Figure 1The solidified shell development process shown in the reference is: "Progress in twin roll casting of magnesium alloys, a review" (Journal of Magnesium and Alloys, 2021, P362-391). Figure 1 As shown in the figure, the thickness of the two solidified shells gradually increases from the meniscus until they are welded together to form a kiss point.

[0006] The instability mechanism and stability control of the twin-roll thin strip process are century-old problems.

[0007] Chinese patent application number 2021101226378 discloses a method for characterizing transport behavior within the molten pool during twin-roll casting. The theoretical basis for this tracing method is the laminar-turbulent partitioning phenomenon within the molten pool, first discovered by the inventors. For reference, see "Physical and computational study of a novel submerged entrynozzle design for twin-roll casting process" (Journal of Iron and Steel Research International, 2021, pp. 1390-1399).

[0008] Based on the discovered "molten pool laminar-turbulent zoning phenomenon," the inventors combined the "turbulent diffusion theory" with the "solid-liquid diffusion theory" to propose a tracing method. In addition, the Chinese patent document with application number 2021112909655 discloses a method for measuring the kiss angle in a twin-roll casting molten pool disclosed by the inventors. The inventors have experimentally clarified the advantages and disadvantages of the tracing method. To remedy the shortcomings of the tracing method, the inventors proposed a kiss angle measurement method based on the "segregation theory" and the fact that "macro-segregation is difficult to eliminate through post-processing." Thus, the transmission process within the twin-roll thin strip molten pool can finally be studied experimentally in the world.

[0009] The background for proposing the tracer method is that: in the existing technology, there is no technology to study the actual shell development process and the molten pool environment in which the shell develops; the leakage method and radioactive element method in conventional continuous casting are not applicable to the twin-roll thin strip process; the mathematical model in the numerical simulation lacks a reliable assumption system. The technical purpose of the tracer method is to directly study the shell development process and the environment in which the shell develops; by analyzing the shell development process and the environment in which the shell develops, the process instability mechanism is revealed. The physical principle of the tracer method is: turbulent diffusion theory. The application basis of the tracer method is: turbulent zoning phenomenon, specifically, turbulence only exists in the velocity boundary layer of the roller surface; turbulent and laminar areas are relatively stable. The preferred tracer delivery strategy for the tracer method is to utilize the solid-liquid diffusion principle. For example: solid copper-liquid aluminum.

[0010] The background for the proposal of the Kiss angle measurement method is that the tracing technology cannot capture the Kiss point; the tracing technology cannot capture the development process of the billet shell when it passes through the two-phase region at the bottom of the molten pool; and the results obtained by the tracing technology still cannot explain the actual process instability phenomenon. The technical objectives of the Kiss angle measurement method are: to capture the Kiss point; to capture the development process of the billet shell when it passes through the two-phase region at the bottom of the molten pool; and to further explore the actual process instability mechanism. The physical principle of the Kiss angle measurement method is: segregation; macro-segregation is difficult to eliminate through heat treatment. The application basis of the Kiss angle measurement method is: the roller body is a cooling substrate; the solidification process occurs in the molten pool.

[0011] Before the inventors proposed the above-mentioned tracing method and kiss angle measurement method, there was no experimental strategy in the world to directly study the actual transport process in the molten pool.

[0012] The transport behavior in the molten pool involved in the patent application documents of the present invention includes the transport of momentum, heat and mass.

[0013] The inventors have found that the actual development process of the "solidified shell" in the molten pool is as follows: Figure 2 As shown in .

[0014] like Figure 2 The “solidified shell” shown is different from the solidified shell in the traditional sense; Figure 2 The “solidified shell” shown does not have a clear solid phase ratio characteristic as traditionally understood.

[0015] The inventors found that Figure 1 As shown and Figure 2 The difference between the development laws of the solidified shell shown in Figure 1 As shown, the two curves converge into a kiss point; Figure 2 As shown, the two straight lines converge into a kiss point. Figure 2The experimental results shown in the figure show that Figure 1 The understanding shown is essentially wrong, as Figure 2 The theoretical diagram of the actual transmission process is shown in Figure 3 shown.

[0016] like Figures 1 to 3 The common thread among the melt pool transport behaviors shown is that, under ideal conditions, the transport process within the twin-roll thin strip process is stable. Unsteady transport behavior within the melt pool is attributed to external factors, or in other words, process stability issues and / or billet quality issues are caused by external factors. These external factors include known process parameters such as melt pool depth, nozzle geometry, nozzle immersion depth, roll speed, roll diameter, roll cooling intensity, superheat, and roll gap opening. In short, the conventional wisdom holds that instability and / or billet quality issues in the twin-roll thin strip process are caused by external factors; that process instability and / or billet quality issues are due to improper matching of existing process parameters; and that process instability and / or billet quality issues are simply due to the difficulty of matching process parameters, i.e., the narrow process window of the twin-roll thin strip process.

[0017] For a century and a half, the field has held to unproven ideas, including Figure 1 The solidified shell development process shown in the figure is not known to the art. In fact, the art does not know that the transport behavior in the molten pool that they firmly believe in is actually one-sided. Figure 1 The development process of the solidified shell and the key influencing factors shown are wrong; some technical personnel in the relevant field firmly believe that there is such a "basic fact", and this "basic fact" is that the change of the roll gap opening can affect the solidification process in the molten pool; based on this firmly believed "basic fact", some technical personnel in the relevant field have proposed a technical solution for adjusting the development process of the solidified shell by using the roll gap opening.

[0018] The implementation method of the "technical solution for regulating the development process of the solidified shell by using the roller gap opening" is as follows: a driving device drives at least one of the two rollers to become a moving roller, so that the two rollers move relative to each other, and the distance between the two rollers changes periodically and / or non-periodically; during the relative movement between the two rollers, the moving roller reciprocates near the equilibrium position. Figure 4 The zero-angle roll gap bidirectional floating method shown in the figure is detailed in the Chinese patent document with application number 2017800317704, which discloses a method for operating a twin-roll thin-strip continuous casting machine to reduce vibration; its technical solution is mainly that relative movement occurs between the two rolls to change the opening of the roll gap; its technical effect is mainly to reduce the vibration of the casting machine by sacrificing the uniformity of the billet thickness and promoting bidirectional fluctuations in the casting and rolling force.

[0019] The casting force is also called the roll clamping force.

[0020] Based on the traditional understanding of the "technical solution for regulating the development process of the solidified shell by using the roller gap opening", some technicians in the field believe that unilateral roller vibration can refine the grains, and unilateral roller vibration will cause relative movement between the two rollers; during the relative movement between the two rollers, the moving roller reciprocates near the equilibrium position. Figure 5 The single-sided roller shown vibrates in a direction perpendicular to the reference plane. For details, see the Chinese patent document with application number 2007101853779, which discloses a vibrating twin-roll thin strip casting and rolling mill. Its technical solution is mainly the vibration of the single-sided roller, which will cause bidirectional fluctuations in the roller clamping force and changes in the thickness of the billet; its technical effect is mainly to refine the grains.

[0021] In the patent application documents of the present invention, the inventors believe that the relative movement between the two rollers will cause changes in the roll gap. The inventors collectively refer to the changes in the roll gap caused by the relative movement between the two rollers as roll gap floating; the roll gap floating in the prior art refers to the bidirectional floating of the roll gap; that is, during the relative movement between the two rollers, one roller moves back and forth near the equilibrium position; in fact, what kind of impact the bidirectional floating of the roll gap can have on the development process of the solidified shell in the molten pool is actually unknown in the relevant field.

[0022] The relative movement between the two rollers causes the Nip point movement. Therefore, in the patent application document of the present invention, roller gap floating can also be referred to as roller gap movement, roller gap movement, Nip point floating, Nip point movement or Nip point movement, etc.

[0023] Normally, due to the presence of side sealing plates and / or considerations of the quality of the edges of the blanks and / or the uniformity of the thickness of the blanks and / or the uniformity of the initial solidification, during the relative movement between the two rollers, the component of the floating speed of the Nip point in the direction of the roller axis is equal to zero; that is, when it comes to roller gap floating, ordinary technicians in the relevant field can directly and unambiguously determine that during the relative movement of the two rollers to cause the roller gap floating, the two roller axes always remain parallel.

[0024] After the inventors used the tracer method and the kiss angle measurement method to study the transmission behavior in the molten pool, the inventors believed that the growth law of the solidified shell in the molten pool is as follows: Figure 2 When the development status shown in FIG. 1 is reached, the inventor proposes the following in the Chinese patent document with application number 2022101047141: Figure 6 The inclined roller gap bidirectional floating method shown in the application number is proposed in the Chinese patent document 2022110378783. Figure 7The fixed gap roll gap bidirectional floating method shown.

[0025] The inventor disclosed a method for yielding motion of a crystallization roll for enhancing the stability of a twin-roll casting process in a Chinese patent application numbered 2022101047141. Figure 6 As shown, the technical solution is mainly to control the relative movement between the two rollers so that the roller gap floats obliquely in both directions. This technical solution will cause bidirectional fluctuations in the roller tightening force and changes in the thickness of the blank.

[0026] The inventor disclosed a method for moving the crystallization roll angle for twin-roll casting and extrusion in Chinese patent document No. 2022110378783, such as Figure 7 As shown, the technical solution is mainly that one roller rotates bidirectionally around another roller. This technical solution is to enhance the uniformity of the thickness of the blank. However, this technical solution still causes bidirectional fluctuations in the tightening force of the rollers.

[0027] like Figures 4 to 7 The roll gap floating methods shown are all bidirectional floating, and the position of the roll gap changes around the equilibrium position; the traditional roll gap bidirectional floating is proposed based on the above-mentioned "basic facts" in order to control the solidification process.

[0028] Current industrial practice shows that the application of traditional technology has to face the following technical difficulties: the two-phase zone of the steel grade cannot be too wide or too narrow. Moreover, although a few steel grades can be produced commercially, the production process is very sensitive to process parameters, and there are various process stability problems and billet quality problems, and the production cost is high. The reason why technical difficulties have existed for a long time and have not been solved is that for a century and a half, due to the lack of corresponding experimental technology, the relevant field has not known what is happening in the molten pool. Due to the lack of understanding of the actual transmission process, the relevant field has not realized the scientific mechanism of the effect of bidirectional floating of the roll gap. Summary of the Invention

[0029] As the inventors continued to conduct in-depth and systematic experimental and theoretical research on the real transmission behavior of the twin-roll thin strip molten pool using the tracer method and the Kiss angle measurement method, the inventors found that: Figure 3 The shown melt pool transport behavior is also one-sided.

[0030] The inventors have found that the transport behavior in the molten pool is quasi-periodic, such as Figure 2 and 3The molten pool transmission behavior shown is only a state that is easily captured by the tracer method and the kiss angle measurement method during the quasi-periodic transmission process. For a century and a half, the field including the present inventors has always believed that the transmission process in the molten pool can be carried out stably under ideal conditions. The technical personnel in the field including the present inventors have made breakthroughs in the following aspects. Figure 1 The traditional understanding shown is very difficult.

[0031] The inventors have studied and mapped the periodic transmission behavior in the molten pool when preparing the alloy billet with a wide two-phase region, as shown in FIG. Figures 8 to 12 shown.

[0032] It should be noted that the "quasi-periodic" in "the transmission behavior is quasi-periodic" means that the transmission behavior has a certain regularity, but at present, this regularity is difficult to express using a periodic function.

[0033] It should be noted that "quasi-periodic" and "cyclical" are completely different: although in many cases "cyclical" transmission behavior cannot guarantee the stable progress of the process and / or the quality of the blank, the "cyclical" transmission behavior is a relatively stable process, and the "cyclical" transmission behavior can continue to be substantially optimized by adjusting the existing process parameters to achieve the process stability and / or blank quality required for actual production; that is, in traditional understanding, the relevant field firmly believes that it is because a more suitable matching relationship of process parameters has not been found that the double-roll thin strip process cannot achieve the required process stability and / or blank quality; however, the "quasi-periodic" transmission behavior is an absolutely unstable process, and the "quasi-periodic" transmission behavior cannot achieve the required process stability and / or blank quality by optimizing the existing process parameters; for the "quasi-periodic" transmission behavior, it is necessary to start from the cause of the "quasi-periodic" transmission behavior and suppress or eliminate the occurrence of the "quasi-periodic" transmission behavior from the source.

[0034] like Figure 8 The stage shown in the figure cannot exist stably and continuously. Due to multiple factors including the heat transfer process, the two-phase region in the lower part of the molten pool becomes wider, and the semi-solid material in the lower part of the molten pool exhibits unequal competition, resulting in the formation of a long-range shear thinning interface. The long-range shear thinning interface converges into a kiss point\angle, forming a Figure 9 The tip of the kiss angle is what those skilled in the art consider to be the kiss point. Since the two long-range shear-thinning interfaces that converge into the kiss line are planes with different velocity directions, the kiss line or point does not actually exist. However, even if the kiss point is merely a virtual point, it still has some value.

[0035] like Figure 9As shown in the figure, the long-range shear thinning interface hinders the transmission of the roller driving force, resulting in the material in the kiss angle area sandwiched between the two long-range shear thinning interfaces having no force required to move out of the molten pool. Therefore, the kiss angle material is not easily updated. The difficulty in updating the kiss angle material will promote the further development of the long-range shear thinning interface, forming the following Figure 10 The kiss angle is formed by the convergence of two long-range shear-thinning interfaces and has dual properties. That is, the kiss angle has both advantages and disadvantages for process stability and green body quality. The advantage is that it prevents the pressure of the molten pool from connecting (or communicating) with the green body core exiting the molten pool, while the disadvantage is that it promotes the development and collapse of long-range shear-thinning interfaces.

[0036] like Figure 10 As shown, the long-range shear thinning interface continues to develop, the low-temperature zone in the molten pool expands, and the temperature in the low-temperature zone continues to decrease. The depth of the molten pool is certain, and the heat carried by the melt entering the molten pool is also certain. When the low-temperature zone increases and the temperature decreases, the high-temperature zone shrinks accordingly and the temperature increases. The temperature difference between the low-temperature zone and the high-temperature zone further increases, and the molten pool transmission environment becomes extreme. The continuous development of the long-range shear thinning interface shows an inhibitory effect on the flow range of the melt. In other words, the solidification process has a limiting effect on the flow area, which is also the shortcoming of the hydraulic model experiment. The shear thinning behavior of semi-solid metals is unstable. The long-range shear thinning interface is formed by shear thinning of semi-solid metals. Due to the continuous decrease in the enthalpy of the semi-solid material at the bottom of the molten pool, in the absence of external disturbance factors, the long-range shear thinning interface naturally collapses, forming a Figure 11 The status shown.

[0037] like Figure 11 As shown in the figure, the long-range shear thinning interface that converges into the kiss point\angle collapses, and the semi-solid materials on both sides of the long-range shear thinning interface are instantly welded (or the materials in the kiss angle area are welded to the "solidified shell"). The kiss point\angle disappears, the shear zone in the molten pool instantly becomes the rolling zone, and the shear process instantly becomes the rolling process. This phenomenon causes a sudden increase in the molten pool pressure, forming a pressure peak.

[0038] The inventors have found through research that the excessive molten pool pressure peak generated by the collapse of the excessive development of the kiss angle can easily cause leakage at the side sealing plate, damage to the side sealing plate, and falling off of the side sealing plate attachments, etc.; the excessive molten pool pressure peak will also aggravate the wear and accidental damage of the roller body, and the roller body is the core component of the twin-roll thin strip caster and is expensive.

[0039] The inventors have found through research that an excessively large peak value of the molten pool pressure can also lead to wavy features on the edge of the billet.

[0040] The inventors have found that long-range shear interface collapse may lead to three possible consequences: roller rotation stops; a strong rolling process with consequences sufficient to interrupt the process; and a strong rolling process without consequences sufficient to interrupt the process.

[0041] The inventors have found through research that the heat transfer process is the direct cause of the long-range shear thinning interface collapse, the shear thinning characteristics of semi-solid materials are the fundamental reason, and external disturbance factors can promote the "long-range shear thinning interface collapse" process to occur earlier.

[0042] like Figure 12 As shown in the figure, the low temperature zone is the intense rolling zone, the material in the rolling zone moves out of the molten pool, the area of ​​the low temperature zone shrinks, the high temperature zone moves downward, the temperature of the flow zone decreases, and the temperature of the low temperature zone increases. Figure 12 The status shown returns to Figure 8 In the state shown, due to the higher temperature in the hot zone, "hot areas" may appear across the blank. The presence of "hot areas" can prove that the transmission process is synchronous along the roller axis. Of course, the presence of diagonal cracks on the edge can also indicate that the length of the cycle varies along the roller axis.

[0043] For a description of "bright lines," please refer to the literature: "Strip formation and process stability in twin roll strip casting" (Steel Research International, 2001, P484-489). The appearance of "bright lines" is detrimental to the uniformity of the green body structure because the grains at the "bright lines" are significantly coarser than those in normal areas.

[0044] After research, the inventors found that the existence of oblique cracks on the edge of the blank can indicate that there are differences in the time scale of the quasi-periodic transmission process along the roller axis; that is, along the roller axis, the quasi-periodic transmission process in the molten pool has a certain degree of synchronization, but it is not strictly synchronized; "there are differences in the time scale of the quasi-periodic transmission process along the roller axis" will lead to the occurrence of oblique cracks on the edge of the blank.

[0045] The inventors have found through research that suppressing the quasi-cyclic transmission process can suppress the occurrence of oblique cracks on the edges of the blank.

[0046] The inventors have found through research that: Figures 8 to 10 As shown in the figure, the roller's top tightening force oscillates gently and rises slightly; Figures 10 to 11 As shown in FIG, the roller pressing force suddenly increases, and the twin-roll thin strip casting machine vibrates as described in the Chinese patent document with application number 2017800317704; Figures 11 to 12 As shown, the roller's tightening force oscillates downward.

[0047] like Figure 10 The stage with the richest characteristics of the quasi-periodic transmission process in the molten pool is shown in Figure 2. The detailed transmission process in the molten pool at this stage is shown in Figure 2. Figure 13 shown.

[0048] like Figure 13 As shown in the figure, the separation point is the boundary between the distribution zone and the transition zone; the separation point is the starting point of the separation flow formed after the fast-flowing material carried by the roller (or the roller surface drag flow) encounters the molten pool two-phase area. The separation flow will disturb the distribution zone; after passing the separation point, there is no pure liquid phase and the viscosity of the material increases sharply. Figure 13 As shown in the figure, the compensation point is the boundary between the transition zone and the shear / rolling zone. Past the separation point, the tracer inner layer moves with the roller. Due to resistance, its thickness gradually decreases. When the thickness reaches its minimum and begins to stabilize, this point of minimum thickness is defined as the compensation point. After passing the compensation point, the thickness of the tracer inner layer remains constant. The drag flow inner layer is also called the tracer inner layer.

[0049] like Figure 13 As shown, from the meniscus to the separation point (or, flow distribution area): the drag flow on the roller surface is formed and developed; the drag flow is divided into an outer layer and an inner layer. The outer layer of the drag flow returns to the flow distribution area near the separation point, causing disturbance to the flow distribution area, and the inner layer of the drag flow passes the separation point with the roller surface.

[0050] like Figure 13 As shown, from the separation point to the compensation point (or, transition zone): the moving speed of the inner layer of the roller drag flow gradually decreases, and the farther the material in the inner layer of the roller drag flow is from the roller surface, the greater the speed reduction; the thickness of the inner layer of the roller drag flow gradually becomes thinner; the two-phase region material outside the inner layer of the roller drag flow is driven by the inner layer of the roller drag flow.

[0051] like Figure 13 As shown in the figure, from the compensation point to the Kiss point (or shear zone): the long-range shear thinning interface hinders the transmission of the driving force of the roller body; the Kiss corner material lacks driving force and is not easy to move out of the molten pool smoothly and is difficult to update; the shear zone cannot exist stably and will be transformed into a rolling zone.

[0052] like Figure 13 As shown, from the Kiss point to the Nip point (or, rolling zone): the end of solidification may appear in this area; rolling deformation occurs; the rolling zone is not an area that must always exist.

[0053] According to Figures 8 to 13 The inventors found that the kiss point and corner are not features that always exist in the molten pool. When the long-range shear thinning interface collapses, the kiss point and corner will disappear.

[0054] The inventors have found through systematic experiments and theoretical studies that the "basic fact" assumption on which the conventional roll gap bidirectional floating is based is inappropriate.

[0055] The inventors have discovered that, in conventional bidirectional roll gap floating, only one direction can stabilize the process and / or improve billet quality. However, for a given alloy composition, floating the roll gap in the other direction can deteriorate process stability and negatively impact billet quality. In other words, for a given alloy composition, achieving greater process stability and higher billet quality requires either continuously applying pressure to the melt pool while maintaining the same alloy composition, or continuously reducing the melt pool pressure while maintaining the same alloy composition.

[0056] The inventors have found through research that: for materials with a narrow two-phase region, it is more difficult to generate a kiss angle, which makes it difficult to use the kiss angle to prevent the pressure in the molten pool from connecting with the core of the billet exiting the molten pool; for materials with a wide two-phase region, the kiss angle tends to develop rapidly, resulting in excessive development of the long-range shear thinning interface, and the collapse of the long-range shear thinning interface after excessive development will bring a larger pressure peak to the molten pool.

[0057] The inventors have found through research that for materials with different two-phase region widths, when using the roll gap floating method to improve process stability and enhance green body quality, the float of the roll gap should show a certain preference:

[0058] For materials with a narrow two-phase region, the Nip point should be controlled to move farther away from the free surface of the molten pool or the flow distribution device to promote the formation of the Kiss angle. The Kiss angle can be used to prevent the pressure in the molten pool from connecting with the core of the billet shell after it leaves the molten pool, thereby avoiding billet quality defects such as "ridges", "snake eggs", and "egg-filled pancakes".

[0059] For materials with a wider two-phase zone, the Nip point should be controlled to move farther toward the free liquid surface of the molten pool or the flow distribution device to increase the pressure in the molten pool, promote the renewal of the Kiss angle material, and inhibit the rapid development of the Kiss angle to prevent a high pressure peak from being generated when the long-range shear thinning interface collapses, and avoid various process stability problems such as side sealing plate leakage, side sealing plate damage, tape jamming, and tape breakage caused by excessively high molten pool pressure peaks.

[0060] Through research, the inventors discovered that the instability of the twin-roll thin strip process and / or the quality defects of the blank are common problems. The root cause of these common problems is the quasi-periodic evolution of the long-range shear thinning interface. The quasi-periodic evolution of the long-range shear thinning interface is influenced and determined by the nature of the material, rather than being entirely caused by changes in external process parameters. This may overturn the fundamental understanding of the stability of the twin-roll thin strip process and / or the quality of the blank in the field for the past century and a half.

[0061] The inventors have discovered through research that the kiss angle has dual properties, and the vast majority of steel materials have one of the "dual properties," with only a few falling somewhere between the two. This explains why only a few steel materials have achieved commercial production. Therefore, rationally utilizing the dual properties of the kiss angle can expand the range of steel materials that can be produced using the twin-roller thin strip process.

[0062] The inventors have discovered through research that, in conventional bidirectional floating of the roll gap, although only one direction can stabilize the process and / or improve the quality of the blank, if only one direction is used, the roll tightening force will continue to increase or decrease over a long period of time. This trend in the change of the roll tightening force is not conducive to real-time control.

[0063] In order to solve the current technical problems, the patent application document of the present invention provides a roll gap floating method for a twin-roll thin strip process, wherein a roll system is arranged on a twin-roll thin strip caster, and the roll system includes a first roll body and a second roll body arranged opposite to each other for preparing a blank, the roll axis of the first roll body is called the first roll axis, and the roll axis of the second roll body is called the second roll axis; the plane where the first roll axis and the second roll axis are located is called the placement plane of the roll system; the minimum distance between the first roll body and the second roll body is called the roll gap; the midpoint of the roll gap is called the Nip point; the moving speed of the blank at the Nip point is called the preparation speed; the moving speed of the Nip point caused by the relative movement between the first roll body and the second roll body is called the floating speed of the Nip point; the first roll body and / or the second roll body are movably arranged on the twin-roll thin strip caster to allow the roll gap to be adjustable;

[0064] The method comprises the steps of:

[0065] During the preparation process, the relative movement between the first roller and the second roller is controlled to cause the placement plane to undergo multiple selective movements; in each of the selective movements, the placement plane undergoes one adjacent first rotation and one adjacent second rotation; in each of the first rotations, the inner product of the floating speed and the preparation speed is called the first inner product; in each of the second rotations, the inner product of the floating speed and the preparation speed is called the second inner product; in the multiple selective movements, the first inner product is always greater than zero, or, in the multiple selective movements, the first inner product is always less than zero; in each of the selective movements, the product of the first inner product and the second inner product is less than zero; the angle through which the placement plane rotates in each of the first rotations is called the first angle, and the angle through which the placement plane rotates in each of the second rotations is called the second angle; in each of the selective movements, the absolute value of the first angle is greater than the absolute value of the second angle.

[0066] It's understandable that in actual processes, due to "loads generated during the manufacturing process" and / or "intentionally designed roll shapes," the axes of both rolls are approximately straight lines. In fact, when studying molten pool transfer behavior and / or roll gap fluctuation, the roller axes are typically considered to be absolutely straight lines. In other words, both rolls are considered to be ideal, rigid rotating bodies. For example, in a twin-roll strip caster with equal diameters, the rolls are cylindrical; a cylinder consists of two bases and one side; the two bases of the cylinder are identical circular surfaces; the side of the cylinder is a curved surface; the two end faces of the roll are the two bases of the cylinder, and the roll surface is the side of the cylinder.

[0067] It should be noted that, what can be directly and undoubtedly determined by ordinary technicians in the relevant field is that during the relative movement between the two rollers to cause the roller gap to float, the two roller axes are always parallel.

[0068] It should be noted that, what a person skilled in the art can directly and unambiguously determine is that "the two roller axes are always parallel" includes "the two roller axes are always nearly parallel"; wherein, "the two roller axes are always nearly parallel" means that there may be a definite but unavoidable deviation between the "parallel" that can be achieved under current technical conditions and the "absolute, idealized parallel".

[0069] It is understandable that, in the patent application documents of the present invention, "parallel" includes "nearly parallel"; that is, "parallel" should be understood as "parallel or nearly parallel", or "substantially parallel", or "approximately parallel".

[0070] It's understandable that since the two rollers are parallel, the placement plane can be determined by the plane in which the two rollers lie. Since absolute parallelism is impossible, the placement plane can also be determined by points on the two rollers that are less affected by process parameter variations. For example, the placement plane can be determined by using the four intersection points of the two rollers with the end faces of the two rollers, or any three intersection points. Another example: the placement plane can be determined by using two points on the first roller where the rollers intersect with the end faces of the rollers, and a point on the second roller closest to the center of gravity of the second roller. Another example: the placement plane can be determined by using two points on the first roller and one point on the second roller that are randomly selected.

[0071] It is understandable that a plane perpendicular to one roller axis can be selected, and then the line connecting the intersection of the plane and the two roller axes can be used to represent the placement plane.

[0072] It should be noted that the moving speed of the billet (or thin strip; or material; or cast-rolled material) at the Nip point is called the preparation speed; the preparation speed is used to measure the speed of the billet preparation process; the direction of the preparation speed is called the preparation direction.

[0073] It should be noted that the normal of the placement plane is called the placement normal; there are countless placement normals.

[0074] It can be understood that the preparation speed reflects the speed of the blank preparation process; the size of the preparation speed is only related to the counter-rotation of the two rollers, and has nothing to do with the movement of the roller system and the relative movement between the two rollers; the preparation direction is always along the placement normal and points to the direction of the blank moving out of the molten pool.

[0075] It should be noted that the component of the “floating speed” in the preparation direction is also called the “effective speed”.

[0076] It is understandable that the “floating speed” can be decomposed into “the component speed in the preparation direction” and “the component speed on the placement plane”.

[0077] It will be understood that “floating speed”, “effective speed” and “production speed” are all vector quantities.

[0078] It will be understood that "vector" is also referred to as "vector".

[0079] It should be noted that, in the natural state: the placement plane where the first roller and the second roller are located is also called the reference plane; the preparation speed is also called the reference speed; and the preparation direction is also called the reference direction.

[0080] It can be understood that the "natural state" refers to a state in which the positions of the two rollers relative to the ground do not change from beginning to end during the preparation process; that is, during the preparation process, the "roller gap floating process" mentioned in the patent application document of the present invention never occurs, nor does the "roller system movement process" mentioned in the patent application document of the present invention ever occur; in fact, it is precisely because the preparation process under the natural state has various process stability problems and / or blank quality problems that the traditional roller gap floating method has been proposed in the relevant field.

[0081] It should be noted that, in the natural state, the normal line of the reference plane passing through the Nip point is called the reference line.

[0082] It is understandable that during the preparation process in a natural state, there is no relative movement between the two rollers, and there is no roller system movement. Therefore, the floating speed is equal to zero and the placement plane does not change.

[0083] It can be understood that the reference plane is a unique plane determined by the form of the twin-roll thin strip caster. Therefore, for the horizontal equal-diameter twin-roll thin strip caster, the reference plane is parallel to or coincides with the horizontal plane; for the inclined twin-roll thin strip caster, the reference plane is a plane that forms a certain fixed angle with the horizontal plane; for the horizontal equal-diameter twin-roll thin strip caster, during the preparation process, no matter how complex the roll gap floating process and / or the roll system movement process occurs, the position of the reference plane and the reference line relative to the ground remains unchanged; the same applies to other forms of twin-roll thin strip casters.

[0084] It can be understood that, unlike the placement plane, the reference plane is a fixed plane, that is, the float of the roll gap or the movement of the roll system will not affect the position of the reference plane. This is because: the reference plane is one of the important reference objects for the float of the roll gap and / or the movement of the roll system, and the range of the float of the roll gap or the movement of the roll system is constrained by the form of the twin-roll thin strip caster.

[0085] It is understandable that in three-dimensional space, the roll gap is actually a surface, countless Nip points form a Nip line, and countless Kiss points form a Kiss line; however, in fact, "Nip line" and "Kiss line" are rarely mentioned in the relevant field; for many years, "Nip point" and "Kiss point" have been widely used in the relevant field; and when "Nip point" and "Kiss point" are used to describe the molten pool transfer behavior and / or roll gap floating involved in the patent application document of the present invention, there is no need to specifically state that it is on a plane perpendicular to the roller axis, that is, using "Nip point" and "Kiss point" to describe is actually a common practice in the relevant field; in the patent application document of the present invention, in order to describe the proposed technical solution, according to the common practice in the relevant field, a plane perpendicular to the roller axis is selected, and then the technical features of the proposed technical solution are expressed on this plane. This is the clearest way and the way that ordinary technicians in the relevant field can understand directly and without doubt.

[0086] It should be noted that ordinary technicians in the relevant field can directly and unambiguously understand that "the midpoint of the roll gap is called the Nip point".

[0087] It is understandable that when studying the roll gap floating process, the two rolls are regarded as ideal rigid rotating bodies with parallel roll axes. The floating speed law of the Nip point on any plane perpendicular to the roll axes is the same. Therefore, to study the roll gap floating process, a method that can be directly and unambiguously understood by ordinary technicians in the relevant field is:

[0088] Take any plane perpendicular to the roller axis Ω i ;

[0089] Nip Line and Planar Ω i The intersection point is called Nip point N i ;

[0090] Research Nip point N i the laws of movement.

[0091] It can be understood that, from the normal planes of the reference plane, the normal plane passing through the Nip line in the natural state is selected as the reference plane Π i ; Reference plane Π i With plane Ω i The intersection line is called the reference line π i .

[0092] It can be understood that, without considering the influence of roller system movement, during the relative movement between the two rollers, the Nip line and Nip point N i And the placement plane can move relative to the ground.

[0093] It can be understood that “not considering the influence of roller motion” can also be expressed as: “no roller motion occurs, or the influence of roller motion is eliminated”.

[0094] It can be understood that “eliminating the influence caused by the movement of the roller system”, wherein “eliminating” can also be expressed as: removing; or, removing; or, excluding.

[0095] It can be understood that during the relative motion between the two rollers, the reference plane and the plane Ω i , reference plane Π i , reference line π i Its position relative to the ground is fixed.

[0096] It is understandable that there are countless normals to the reference plane; however, in the patent application document of the present invention, the normal of the reference plane passing through the Nip point in the natural state is selected as the reference line; that is, the reference line has two characteristics, the reference line is the normal of the reference plane, and the reference line passes through the Nip point in the natural state.

[0097] It can be understood that the reference line is the normal line of the reference plane passing through the Nip point in the natural state.

[0098] It is understandable that in three-dimensional space, there are countless "Nip points" and countless reference lines, and countless reference lines form a "reference plane".

[0099] It is understandable that whether the “reference line” passes through the Nip point in the natural state does not affect the description of the protection scope in the patent application document of the present invention.

[0100] It should be noted that if Figure 14 As shown, take any plane perpendicular to the roller axis, and then display on this plane a schematic diagram of the relationship between the two roller bodies, two roller axes, the placement plane, the reference plane, the roller gap, the Nip point, the reference line, the speed at which the roller surface passes through the roller gap, the preparation speed, the preparation direction and the reference direction under different states.

[0101] It is understandable that “under different conditions” can also be expressed as: “under natural conditions or unnatural conditions”.

[0102] It should be noted that if Figure 14 As shown, "perpendicular" is a symbol used to indicate a perpendicular relationship; "perpendicular" is also called "perpendicular sign" or "perpendicular sign".

[0103] It should be noted that if Figure 14As shown in the “speed of the roller surface passing through the roller gap”, since the roller body is regarded as an ideal rigid rotating body, the “direction of the speed of the roller surface passing through the roller gap” and the “direction of the preparation speed” are always the same; that is, the “direction of the speed of the roller surface passing through the roller gap” and the “preparation direction” are always the same.

[0104] It should be noted that if Figure 14 As shown in the figure, in the natural state, the plane where the two rollers are located is called the reference plane, and the direction of the moving speed of the blank at the Nip point is called the "reference direction"; the "reference direction" is always perpendicular to the reference plane; in the natural state, the placement plane coincides with the reference plane, and the preparation direction is the same as the reference direction; that is, the reference plane is a special case of the placement plane, the reference direction is a special case of the preparation direction, and the reference line is a special case of the placement normal.

[0105] It should be noted that "each time the first rotation occurs, the inner product of the floating speed and the preparation speed is called the first inner product; each time the second rotation occurs, the inner product of the floating speed and the preparation speed is called the second inner product", among which, ordinary technicians in the relevant field can directly and unambiguously know the "inner product".

[0106] It can be understood that in the three-dimensional rectangular coordinate system (X, Y, Z), let vector U = [x1, y1, z1], let vector V = [x2, y2, z2], then the inner product of vector U and vector V is: U·V=x1x2+y1y2+z1z2.

[0107] It should be noted that the "inner product" is also called the "scalar product"; or the "dot product".

[0108] It can be understood that "during the preparation process, the relative movement between the first roller and the second roller is controlled so that the placement plane undergoes multiple selective movements", wherein the "selective movement" must be caused only by the relative movement between the two rollers, and the "selective movement" has nothing to do with the movement of the roller system.

[0109] It is understood that, “in each of the selective movements, the placement plane undergoes a first rotation and a second rotation that are adjacent to each other”, wherein “adjacent” means:

[0110] During each selective movement, there is no relative movement between the two rollers between a first rotation and a second rotation that occur adjacently.

[0111] or,

[0112] There is relative motion between the two rollers, but the effective speed is zero.

[0113] It is understandable that, further explanation, “no relative movement occurs between the two rollers between a first rotation and a second rotation that occur adjacently” includes the following situations:

[0114] For a first rotation and a second rotation that occur adjacently, the end time of the first rotation is the start time of the second rotation;

[0115] A first rotation and a second rotation occur adjacently. After the first rotation is completed, there is a pause for a period of time, and then the second rotation is performed.

[0116] It is understandable that “effective speed is equal to zero” can also be expressed as: “the component speed of the floating speed in the preparation direction is equal to zero”; or, “the placement plane does not change”.

[0117] It can be understood that “during each occurrence of the first rotation” and “during each occurrence of the second rotation”, where “during” can be expressed as: “between the starting moment and the ending moment”.

[0118] It is understandable that “between the starting moment and the ending moment” does not include the “starting moment” or the “ending moment”; that is, “between the starting moment and the ending moment” does not include the end value.

[0119] It can be understood that "each time the first rotation occurs, the inner product of the floating speed and the preparation speed is called the first inner product" and "each time the second rotation occurs, the inner product of the floating speed and the preparation speed is called the second inner product", wherein "the inner product of the floating speed and the preparation speed" can also be expressed as: "the inner product of the effective speed and the preparation speed".

[0120] It can be understood that "during the process of the multiple selective movements, the first inner product is always greater than zero, or, during the process of the multiple selective movements, the first inner product is always less than zero" can also be expressed as: "the first inner product in the multiple selective movements is always greater than zero, or, the first inner product in the multiple selective movements is always less than zero"; or, "the first inner product in each selective movement is always greater than zero, or, the first inner product in each selective movement is always less than zero".

[0121] It can be understood that "in each of the selective movements, the product of the first inner product and the second inner product is always less than zero", wherein, ordinary technicians in the relevant field can directly and undoubtably know that "product" is different from "inner product"; the object of "product" is "quantity", while the object of "inner product" is "vector"; "quantity" only has size, while "vector" has both size and direction; the result of the "product" of two "quantities" is "quantity", and the result of the "inner product" of two "vectors" is "quantity".

[0122] It can be understood that "in each selective movement, the product of the first inner product and the second inner product is less than zero" means: in each selective movement, if "the direction of the effective speed during the first rotation is the same as the direction of the preparation speed", then "the direction of the effective speed during the second rotation is opposite to the direction of the preparation speed"; or, in each selective movement, if "the direction of the effective speed during the first rotation is opposite to the direction of the preparation speed", then "the direction of the effective speed during the second rotation is the same as the direction of the preparation speed".

[0123] It can be understood that "in each of the selective movements, the product of the first inner product and the second inner product is less than zero" can also be expressed as: "in each of the selective movements, the product of the first inner product at any time during the first rotation and the second inner product at any time during the second rotation is less than zero."

[0124] It can be understood that “the angle through which the placement plane rotates each time the first rotation is called a first angle, and the angle through which the placement plane rotates each time the second rotation is called a second angle”, wherein “the first angle” and “the second angle” are both vectors.

[0125] It can be understood that, during the process of multiple different first rotations, let the preparation speed be vector U and let the floating speed be vector V; then, the inner product of vector U and vector V is always greater than zero, or always less than zero.

[0126] It is understandable that “always greater than zero” can be expressed as “always a positive value”, and “always less than zero” can be expressed as “always a negative value”.

[0127] It can be understood that, during the entire time during each first rotation, the direction of the effective speed is always the same as or opposite to the preparation direction; that is, between the start and end moments of each first rotation, the effective speed is always not equal to zero, and no roller system movement occurs (or the influence of the roller system movement is eliminated), the placement plane changes, and the change of the placement plane occurs continuously.

[0128] It is understandable that “the entire time during each first rotation” does not include the “starting moment” or the “ending moment”; that is, “the entire time during each first rotation” does not include the end value.

[0129] It is understandable that, during the entire time during each second rotation, the direction of the effective speed is always the same as or opposite to the preparation direction; that is, between the start and end times of each second rotation, the effective speed is always not equal to zero, the placement plane rotates, and the rotation of the placement plane occurs continuously.

[0130] It is understandable that “the entire time during which each second rotation occurs” does not include the “starting moment” or the “ending moment”; that is, “the entire time during which each second rotation occurs” does not include the end value.

[0131] It should be noted that a relative motion between the two rollers refers to: from the moment when the relative motion between the two rollers occurs to the end of this relative motion; and at the starting moment and the ending moment of this relative motion, the speed of one roller relative to the other roller is zero.

[0132] It can be understood that once a relative motion between the two rollers begins, as long as the relative speed between the two rollers is equal to zero, the relative motion is declared to be over.

[0133] It should be noted that the "roller system" is also called a "double-roller roll system"; the relative movement between the two rollers belongs to the internal movement of the roll system, and the internal movement of the roll system will cause the roll gap to float.

[0134] It should be noted that the rollers on the twin-roll thin strip caster can move as a whole.

[0135] It is understood that the movement mode of the roller system includes at least one of the following situations:

[0136] Translation;

[0137] Rotate.

[0138] It can be understood that the roller system only moves in translation, and the linear velocity of any point on the roller system is the same in magnitude and direction.

[0139] It can be understood that the roller system only rotates around a virtual axis, and the axis can be any straight line in space that is parallel to the first roller axis or the second roller axis.

[0140] It should be noted that the movement of the roller system will not cause a change in the relative position between the two roller bodies; that is, the movement of the roller system will neither cause the roller gap to float nor affect the roller gap to float.

[0141] It will be appreciated that the rollers move on the twin-roll strip caster, but if there is no relative motion between the two rollers, both the floating speed and the effective speed are equal to zero.

[0142] It can be understood that "the placement plane rotates" means that: when there is no roller system movement, or when the influence of the roller system movement is eliminated and there is no relative movement between the two roller bodies (or in a natural state), the two roller axes are located at the placement plane Θ 1g After the relative motion between the two rollers occurs, the two rollers are located on the placement plane Θ 2g ; plane Θ 1g and plane Θ 2g Non-coincidence, plane Θ 1g and plane Θ 2g intersect.

[0143] It can be understood that if no roller system movement occurs during the first rotation, then the "floating speed" that can actively cause the change in the molten pool pressure has the same meaning as the "speed of the Nip point relative to the ground".

[0144] It is understandable that if at a certain moment of the first rotation, the roller system movement occurs simultaneously, then the ground velocity of the Nip point (expressed by vector V T It includes two aspects: On the one hand, the ground velocity of the Nip point caused by the roller system motion is represented by vector V W On the other hand, due to the relative motion between the two rollers, the ground velocity of the Nip point is represented by vector V F Then, floating speed = V F =V T -V W .

[0145] It is understandable that, according to the above explanation, it is clear that in the patent application document of the present invention, "floating speed" (or vector V F ) is unrelated to roll motion. This is because simple roll motion will cause the Nip point's relative position to change, and simple roll gap floating will also cause the Nip point's relative position to change. However, simple roll motion and simple roll gap floating have completely different effects on the melt pool's transfer behavior. If only roll motion occurs without roll gap floating, then there is no need to discuss the Nip point's state changes. Because discussing the Nip point's state changes without roll gap floating is meaningless for the present invention.

[0146] It can be understood that, based on the above explanation of "floating speed", it can be clearly seen that: the first rotation and the second rotation must be generated solely by the relative movement between the two rollers; therefore, the first rotation and the second rotation are both determined solely by the relative movement between the two rollers; that is, the first rotation and the second rotation are unrelated to the movement of the roller system.

[0147] It can be understood that the "floating speed", "effective speed", "first angle" and "second angle" that can actively cause changes in the molten pool pressure are used to quantitatively analyze the effect of roller gap floating on the molten pool transmission process. Therefore, the "floating speed", "effective speed", "first angle" and "second angle" must be caused only by the relative movement between the two rollers.

[0148] It can be understood that when studying the "floating speed", it can be assumed that there is a three-dimensional rectangular coordinate system (X', Y', Z'), and the coordinate system (X', Y', Z') always remains relatively stationary with the roller system. Then: the speed of the Nip point in the coordinate system (X', Y', Z') is the "floating speed".

[0149] It is understandable that the “displacement of the Nip point” mentioned below must also be caused solely by the relative movement between the two rollers.

[0150] It can be understood that if there is no relative motion between the two rollers (or the first roller remains stationary relative to the second roller), and at times t1 and t2, the roller system is stationary relative to the ground, and between times t1 and t2, a relative motion occurs between the roller system and the ground, and the roller system rotates clockwise around the second roller axis without stopping through an angle ω1, and the motion of the roller system causes the position of the placement plane relative to the ground to change, then: between times t1 and t2 (or, during the relative motion between the roller system and the ground), the floating velocity is always equal to zero.

[0151] It can be understood that if no roller system movement occurs, assuming that at moments t'1 and t'2, the two rollers are relatively stationary (or, the speed of one roller relative to the other roller is zero), and assuming that between moments t'1 and t'2, a relative movement occurs between the two rollers, and the first roller rotates clockwise around the second roller axis without stopping through an angle ω'1. The relative movement between the two rollers causes the position of the placement plane relative to the ground to change. During the relative movement of the two rollers, the roller gap opening is constant. Therefore: between moments t'1 and t'2 (or, during this relative movement between the two rollers), the floating speed is always not equal to zero, and the direction of the preparation speed changes without stopping.

[0152] It should be noted that even without the above detailed explanation of the “floating speed”, a person skilled in the art can directly and without doubt know that the “floating speed” must be generated only by the relative motion between the two rollers.

[0153] It should be noted that a first rotation means that no roller motion occurs (or the influence of the roller motion is eliminated), and the angular velocity of the placement plane starts from zero and ends when it becomes zero again.

[0154] It is understood that those skilled in the art can directly and unambiguously determine that "floating speed equals zero" and "effective speed equals zero," where "equal to zero" includes "approaching zero"; "approaching zero" means that, under current technological conditions, there may be a certain but unavoidable deviation between "speed" and "zero." For example, during the manufacturing process, the two rollers may experience deformation and / or vibration under load that cannot be completely eliminated; or during roller movement, the transfer behavior in the molten pool is not ideal, which may lead to unavoidable deviations between the actual roller movement and the set movement.

[0155] It is understood that, in the present patent application documents, unless otherwise specified, "equal to zero" includes "approaching zero"; that is, "equal to zero" should be understood as "equal to zero or approaching zero" or "substantially equal to zero." For example, "angular velocity equal to zero" should be understood as "angular velocity equal to zero or approaching zero," "angular velocity substantially equal to zero," or "angular velocity approximately equal to zero."

[0156] It can be understood that one second rotation means that no roller motion occurs (or the influence of the roller motion is eliminated), and the angular velocity of the placement plane starts from zero and ends when it becomes zero again.

[0157] It can be understood that at the starting and ending moments of the "first rotation", the "effective speed" is equal to zero; at the starting and ending moments of the "second rotation", the "effective speed" is equal to zero; however, since the "effective speed" is only the component speed of the "floating speed" in the preparation direction, the "floating speed" is not necessarily equal to zero at the starting and ending moments of the "first rotation" and the "second rotation".

[0158] It can be understood that one first rotation is a non-stop rotation of the placement plane; one second rotation is a non-stop rotation of the placement plane.

[0159] It can be understood that the “first angle” and the “second angle” are defined based on the effective speed.

[0160] It is understandable that, without roller motion (or excluding the influence of roller motion), the "one relative motion between the placement plane and the ground" caused solely by the relative motion between the two rollers is equivalent to a "rotation" of the placement plane. However, "one relative motion between the placement plane and the ground" is not necessarily equal to "one relative motion between the two rollers."

[0161] It is understandable that, based on the above explanation of "a single relative motion between the two rollers", "a single relative motion between the placement plane and the ground" caused solely by the relative motion between the two rollers means: no roller motion occurs (or the influence of the roller motion is eliminated), from the moment the relative motion between the placement plane and the ground occurs until the relative motion between the placement plane and the ground ends; and, at the start and end moments of the relative motion between the placement plane and the ground, the angular velocity of the rotation of the placement plane relative to the ground is zero.

[0162] It can be understood that "the angular velocity of the rotation of the placement plane relative to the ground is equal to zero" can also be expressed as: "the effective velocity of the Nip point is equal to zero"; or, "the component velocity of the floating velocity in the preparation direction is equal to zero"; or, "the inner product of the floating velocity and the preparation speed is equal to zero".

[0163] It is understandable that during a relative movement between the two rollers, one or more selective movements may occur. Figure 15 As shown, take any plane Σ perpendicular to the first roller axis. In the natural state, the intersection of the first roller axis and the plane Σ is O1, and the intersection of the second roller axis and the plane Σ is O2. During a certain period of time in the preparation process, a relative motion occurs between the two rollers.

[0164] It is understandable that if Figure 15 As shown in the figure, during the relative motion between the two rollers, the first roller moves relative to the ground, and the second roller is stationary relative to the ground; the first roller axis starts from point O1 and moves along the trajectory O1~O 1-1 ~O 1-2 ~O 1-3 Continuous movement to point O 1-3 The Nip point starts from point N and moves without stopping along the trajectory N~N1~N2~N3 to point N3 and then stops; the Nip point at the starting moment of the relative motion between the two rollers is located at point N, and the Nip point at the ending moment of the relative motion between the two rollers is located at point N3; at points N and N3, the floating speed is zero; at points N, N2 and N3, the effective speed is zero; the first angle is vector ω1; the second angle is vector ω2.

[0165] It is understandable that if Figure 15 As shown, between the adjacent first rotation and the second rotation, the end moment of the first rotation is the starting moment of the second rotation, and the effective speed at the end moment of the first rotation and the starting moment of the second rotation is equal to zero; that is, in the process of relative movement between the two rollers, both the first rotation and the second rotation occur; in the process of the first rotation, the direction of the effective speed is always opposite to the direction of the preparation speed, that is, the inner product of the floating speed and the preparation speed is always less than zero, and the first inner product is always less than zero; in the process of the second rotation, the direction of the effective speed is always the same as the direction of the preparation speed, that is, the inner product of the floating speed and the preparation speed is always greater than zero, and the second inner product is always greater than zero; the absolute value of the first angle ω1 is greater than the absolute value of the second angle ω2.

[0166] It is understandable that if Figure 15 In the selective movement shown, the product of the first inner product and the second inner product is always less than zero; the absolute value of the first angle is greater than the absolute value of the second angle.

[0167] It can be understood that “the absolute value of the first angle ω1 is greater than the absolute value of the second angle ω2” can also be expressed as: “|ω1|>|ω2|”.

[0168] It should be noted that if Figure 15 As shown, the absolute value of the first angle ω1 and / or the absolute value of the second angle ω2 can be set in the range of 0.01 to 1 degree, or in other ranges.

[0169] It is understandable that if Figure 15 It is shown that "in the process of relative movement between the two rollers, the first roller moves relative to the ground, and the second roller is stationary relative to the ground" is used to explain the "first rotation" and the "second rotation"; a person skilled in the art can directly and unambiguously determine that in the process of relative movement between the two rollers, when the two rollers move relative to the ground at the same time, after eliminating the influence of the roller system movement that may be caused by the simultaneous movement of the two rollers relative to the ground, the relative movement between the two rollers can be further transformed (or equivalently) into: the first roller moves relative to the ground, and the second roller is stationary relative to the ground; or, the first roller is stationary relative to the ground, and the second roller moves relative to the ground.

[0170] It can be understood that, regarding the "first rotation" and the "second rotation", ordinary technicians in the relevant field can understand that "first" and "second" are only used to distinguish the rotations of the placement plane that occur in the preparation process and have different characteristics and are only caused by the relative movement between the two rollers; "first" and "second" are not used to limit the order of generation; in a selective movement, the order of occurrence of the first rotation and the second rotation is not particular; that is, in a selective movement, the first rotation may occur first and then the second rotation may occur adjacently, or the second rotation may occur first and then the first rotation may occur adjacently.

[0171] It should be noted that the "absolute value of the first angle" can also be expressed as the "magnitude of the first angle." In other words, the absolute value of a vector and the magnitude of a vector have the same meaning. The same applies to the second angle.

[0172] It should be noted that if Figure 16 The following is an example of a horizontal equal-diameter twin-roll thin strip caster; point N1 is located on line segment O. 1-1 On O2, line segment O 1-1 O2 is located in plane Ψ 1-1 On; point N2 is located on line segment O 1-2 On O2, line segment O 1-2 O2 is located in plane Ψ 2-1 Up; point O 1-3 , point N4 and point N3 are all located on line segment O 1-4 On O2, line segment O 1-4 O2 is located in plane Ψ 1-2 Up; point O 1-2 Located on line segment O 1-5 On O2, line segment O 1-5 O2 is located in plane Ψ 1-3 Up; plane 2-1 With plane Ψ 1-3 coincidence; line segment O 1-1 O 1-2 With arc O 1-2 O 1-3 Tangent at point O 1-2 , line segment O 1-3 O 1-4 With arc O 1-2 O 1-3 Tangent at point O 1-3 ; During the relative movement between the two rollers, the first roller moves relative to the ground, and the second roller remains stationary relative to the ground.

[0173] It is understandable that if Figure 16 As shown, if the first roller is from point O 1-1 Starting from O, along the trajectory 1-1 ~O 1-2 ~O1-3 ~O 1-4 Continuous movement to point O 1-4 Then the first roller stops at point O. 1-4 Starting from point O, along line segment 1-4 O 1-5 Continuous movement to point O 1-5 The Nip point starts from point N1 and moves along the trajectory N1~N2~N3~N4 without stopping to point N4 and then stops. Then, the Nip point starts from point N4 and moves along the line segment N4N5 without stopping to point N5 and then stops. The placement plane starts from plane Ψ 1-1 Rotate to plane Ψ 1-2 At this point, the first angle ω1 is generated, and then the plane is placed from the plane Ψ 1-2 Rotate to plane Ψ 2-1 At this point, a second angle ω2 is generated; during the occurrence of the first angle ω1, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; during the occurrence of the second angle ω2, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; when the first roller axis moves from point O 1-3 Starting from O, along the trajectory 1-3 ~O 1-4 Move to point O 1-4 During the process of rotation, the placement plane does not change; that is, the relative movement between the two rollers produces a first angle ω1, and the relative movement between the two rollers produces a second angle ω2; the absolute value of the first angle ω1 is greater than the absolute value of the second angle ω2, |ω1|>|ω2|; between the adjacent first rotation and the second rotation, the two rollers move relative to each other, and the first roller axis moves along the trajectory O 1-3 ~O 1-4 From point O 1-3 Move to point O 1-4 At this point, the effective velocity is zero and the placement plane does not change.

[0174] It can be understood that if a relative motion occurs between the two rollers, and this relative motion between the two rollers does not change the placement plane; that is, during the relative motion between the two rollers, the inner product of the floating speed and the preparation speed is always equal to zero; then, this relative motion between the two rollers neither causes the placement plane to produce a first angle (or a first rotation) nor causes the placement plane to produce a second angle (or a second rotation).

[0175] It should be noted that if Figure 17 The figure shows the "one-time selective motion" using the horizontal equal diameter twin-roll thin strip caster as an example; point N is the Nip point in the natural state; point O 1-2, point N1 and point N2 are located on line segment O 1-1 On O2, line segment O 1-1 O2 is located in plane Ψ 1-1 On; point N3 is located on line segment O 1-3 On O2, line segment O 1-3 O2 is located in plane Ψ 1-2 During the relative motion between the two rollers, the first roller moves relative to the ground, while the second roller remains stationary relative to the ground.

[0176] It is understandable that if Figure 17 As shown, the relative motion between the two rollers occurs three times continuously:

[0177] The first relative motion between the two rollers, the first roller axis starts from point O1 and moves along the line segment O1O 1-1 Continuous movement to point O 1-1 After that, the placement plane rotates from plane Ψ0 to plane Ψ 1-1 At this point, the first rotation occurs, generating the first angle ω 1-1 , at the first angle ω 1-1 During the process, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero;

[0178] The second relative movement between the two rollers, the first roller axis moves from point O 1-1 Starting from point O, along line segment 1-1 O 1-2 Continuous movement to point O 1-2 After the position is reached, it stops, the placement plane does not rotate, the floating speed is not equal to zero, the effective speed is always equal to zero, and the Nip point produces a displacement of N1→N2;

[0179] The third relative movement between the two rollers, the first roller axis moves from point O 1-2 Starting from point O, along line segment 1-2 O 1-3 Continuous movement to point O 1-3 Stop after placing the plane from the plane 1-1 Rotate to plane Ψ 1-2 At this point, the second rotation occurs, generating a second angle ω 1-2 , at the second angle ω 1-2 During the process, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero;

[0180] A first rotation and a second rotation occur adjacently.

[0181] It can be understood that “N1→N2” represents a vector with its starting point at point N1 and its end point at point N2, and its direction points from point N1 to point N2.

[0182] It can be understood that, in the patent application document of the present invention, the displacement N1→N2 is generated during the process of adjusting the roller gap opening.

[0183] After research, the inventors found that the significance of the displacement N1→N2 is that under the current technical conditions, it may be difficult to maintain the absolute constancy of the roll gap opening during the first displacement and / or the second displacement, although the absolute constancy of the roll gap opening is beneficial to the process stability and / or the quality of the blank; in order to enable the selective movement to be accumulated without limit according to actual needs to achieve the required technical purpose, and to reduce the impact of the cumulative effect of equipment errors and / or control errors on the roll gap opening, when the roll gap opening deviates from the set value and reaches a certain extent, the relative movement between the two rollers can be controlled without changing the placement plane to appropriately adjust the distance between the two rollers; of course, necessary adjustments can also be made to the roll gap opening while the first displacement and / or the second displacement occur, and the current technical conditions should be taken into consideration.

[0184] It should be noted that if Figure 16 and 17 As shown, in each selective movement, the first inner product is always less than zero, and the second inner product is always greater than zero; a person skilled in the art can directly and without doubt know that in other embodiments, in each selective movement, the first inner product is always greater than zero, and the second inner product is always less than zero.

[0185] Furthermore, in a roller gap floating method of a double-roll thin strip process, the multiple selective movements occur continuously or partially continuously; between two adjacent selective movements, no relative movement occurs between the first roller and the second roller, or relative movement occurs between the first roller and the second roller, but the inner product of the floating speed and the preparation speed is equal to zero.

[0186] It can be understood that "the multiple selective movements occur continuously or partially continuously"; assuming that the Nth selective movement and the (N+1)th selective movement occur continuously, and the Nth selective movement occurs first and the (N+1)th selective movement occurs later, and N is a positive integer; then, the "starting moment of the (N+1)th selective movement" is the "ending moment of the Nth selective movement", or the "starting moment of the (N+1)th selective movement" is "a moment after the ending moment of the Nth selective movement"; that is to say, the "starting moment of the (N+1)th selective movement" cannot be "a moment between the starting moment and the ending moment of the Nth selective movement".

[0187] It is understood that "continuous" means:

[0188] Between two adjacent selective movements, there is no relative movement between the two rollers;

[0189] or,

[0190] Between two adjacent selective movements, although relative movement occurs between the two rollers, the relative movement between the two rollers only makes the direction of the floating speed perpendicular to the preparation direction, that is, the effective speed is equal to zero, the inner product of the floating speed and the preparation speed is equal to zero, and the placement plane does not change (no roller movement occurs, or the influence of the roller movement is eliminated).

[0191] Furthermore, in a roll gap floating method of a twin-roll thin strip process, at least two of the selective movements occur continuously.

[0192] The inventors have found through research that, under normal circumstances, controlling multiple selective movements to occur continuously is more conducive to process stability and / or green body quality.

[0193] Furthermore, in a roll gap floating method of a twin-roll thin strip process, at least three of the selective movements occur continuously.

[0194] The inventors have found through research that, under normal circumstances, the more times the selective movements occur continuously, the more beneficial it is to the stability of the process and / or the quality of the green body.

[0195] Furthermore, in a roll gap floating method of a double-roll thin strip process, in one selective movement, the ratio of the absolute value of the second angle to the absolute value of the first angle is in the range of 0.05 to 0.95.

[0196] Furthermore, in a roll gap floating method of a twin-roll thin strip process, the frequency of the selective motion is in the range of 0.01 to 10 Hz.

[0197] It can be understood that the “frequency of occurrence of selective movement” refers to the number of times the selective movement occurs per unit time.

[0198] Furthermore, in a roll gap floating method of a twin-roll thin strip process, in each of the selective movements, the first inner product is less than zero.

[0199] Furthermore, in a roll gap floating method of a double-roll thin strip process, in one selective movement, the displacement direction of the Nip point corresponding to the first angle is perpendicular to the displacement direction of the Nip point corresponding to the second angle.

[0200] It can be understood that the “displacement of the Nip point corresponding to the first angle” refers to the displacement of the Nip point caused by the relative movement between the two rollers between the starting moment and the ending moment of “the first angle” (or the first rotation).

[0201] It can be understood that the “displacement of the Nip point corresponding to the second angle” refers to the displacement of the Nip point caused by the relative movement between the two rollers between the starting moment and the ending moment of the “second angle” (or the second rotation).

[0202] Preferably, in a roller gap floating method of a double-roll thin strip process, in one selective movement, the direction of the floating speed corresponding to the first angle does not change, the direction of the floating speed corresponding to the second angle does not change, and the direction of the floating speed corresponding to the first angle is perpendicular to the direction of the floating speed corresponding to the second angle.

[0203] It can be understood that "in one selective movement, the direction of the floating speed corresponding to the first angle does not change, and the direction of the floating speed corresponding to the second angle does not change", that is, the movement of the Nip point corresponding to the first angle is a linear motion, and the movement of the Nip point corresponding to the second angle is a linear motion.

[0204] Furthermore, in a roll gap floating method of a double-roll thin strip process, in a natural state, the direction of the moving speed of the blank at the Nip point is called a reference direction; in one selective movement, the direction of the displacement of the Nip point corresponding to the first angle is oblique or parallel to the reference direction.

[0205] Furthermore, in a roller gap floating method of a double-roller thin strip process, in the multiple selective movements, the absolute value of the first angle is the same each time.

[0206] Furthermore, in a roll gap floating method of a twin-roll thin strip process, in the multiple selective movements, the absolute value of the first angle is the same at least twice.

[0207] Furthermore, in a roll gap floating method of a double-roll thin strip process, in one selective movement, the direction of displacement of the Nip point corresponding to the first angle and the direction of displacement of the Nip point corresponding to the second angle are opposite.

[0208] It can be understood that "in one selective movement, the direction of displacement of the Nip point corresponding to the first angle and the direction of displacement of the Nip point corresponding to the second angle are opposite" can also be expressed as: in one selective movement, the angle formed by the direction of displacement of the Nip point corresponding to the first angle and the direction of displacement of the Nip point corresponding to the second angle is 180 degrees.

[0209] It is understandable that in order to further clarify the relationship between the "first angle" and the corresponding "displacement of the Nip point", the present inventors combined Figure 17 To explain, such as Figure 17 As shown, the first angle ω 1-1 The corresponding “displacement of point Nip” is: vector N→N1, and the direction is from point N to point N1.

[0210] It is understandable that in order to further clarify the relationship between the "second angle" and the corresponding "displacement of the Nip point", the present inventors combined Figure 17 To explain, such as Figure 17 As shown, the second angle ω 1-2 The corresponding “displacement of the Nip point” is: vector N2→N3, and the direction is from point N2 to point N3.

[0211] It should be noted that if Figure 17 As shown, in one selective movement, the first angle ω 1-1 The direction of the displacement N→N1 of the corresponding Nip point is oblique to the reference direction; of course, the direction of the displacement N→N1 of the Nip point corresponding to the first angle may be the same as or opposite to the reference direction.

[0212] It should be noted that if Figure 17 As shown, in one selective movement, the second angle ω of the placement plane 1-2 The direction of the displacement N2→N3 of the corresponding Nip point is oblique to the reference direction; of course, the direction of the displacement N2→N3 of the Nip point corresponding to the second angle may be the same as or opposite to the reference direction.

[0213] Preferably, in a roller gap floating method of a double-roll thin strip process, during one occurrence of the first rotation, the angle formed by the direction of the floating speed and the reference direction does not change.

[0214] Preferably, in a roller gap floating method of a double-roll thin strip process, during one occurrence of the second rotation, the angle formed by the direction of the floating speed and the reference direction does not change.

[0215] Furthermore, during one occurrence of the first rotation, the direction of the floating speed is always opposite to the direction of the preparation speed.

[0216] It can be understood that if "the direction of the floating speed is always opposite to the direction of the preparation speed", the opening of the roller gap is constant.

[0217] Furthermore, during one occurrence of the first rotation, the direction of the floating speed is always the same as the direction of the preparation speed.

[0218] It can be understood that if “the direction of the floating speed is always the same as the direction of the preparation speed”, the opening of the roller gap is constant.

[0219] Furthermore, in a roll gap floating method of a double-roll thin strip process, the absolute value of the first angle and / or the absolute value of the second angle is in the range of 0.01 to 0.1 degrees.

[0220] Furthermore, in a roll gap floating method of a double-roll thin strip process, the absolute value of the first angle and / or the absolute value of the second angle is in the range of 0.1 to 1 degree.

[0221] Furthermore, in a roll gap floating method of a double-roll thin strip process, the absolute value of the first angle and / or the absolute value of the second angle is in the range of 1 to 5 degrees.

[0222] Furthermore, in a roll gap floating method of a twin-roll thin strip process, the opening of the roll gap is constant during part or all of the time during which the selective movement occurs.

[0223] Preferably, in a roll gap floating method of a twin-roll thin strip process, the opening of the roll gap is constant throughout the entire time during which the multiple selective movements occur.

[0224] Furthermore, in a roll gap floating method for a twin-roll thin strip process, in a natural state, the plane where the first roller axis and the second roller axis lie is called a reference plane; and the relative motion between the two rollers that generates the first rotation and / or the second rotation includes one or more of the following motion modes:

[0225] The first roller body rotates around the second roller axis;

[0226] The second roller body rotates around the first roller axis;

[0227] The direction of the speed of the first roller and / or the direction of the speed of the second roller are perpendicular to the reference plane;

[0228] The direction of the speed of the first roller and / or the direction of the speed of the second roller are oblique to the reference plane;

[0229] The first roller body rotates around any axis parallel to the first roller axis;

[0230] The second roller body rotates around any axis parallel to the second roller shaft.

[0231] It can be understood that any of the above-mentioned "relative movement between the two rollers that produces the first rotation and / or the second rotation" will cause the Nip point to float and the placement plane to change. Different "movement modes" will lead to differences in the changing trend or rate of change of the effective speed; however, without considering the influence of the roller gap opening, as long as the direction of the effective speed is opposite to the preparation direction, the molten pool pressure can be sustainably increased. Conversely, as long as the direction of the effective speed is the same as the preparation direction, the molten pool pressure can be sustainably reduced.

[0232] It is understandable that ordinary technicians in the relevant field can directly and undoubtably determine that, according to the needs of the actual process, the roller gap opening is guaranteed not to change or to change within the allowable range, and the above-mentioned "movement mode" and appropriate parameters are selected for combination so that the selective movement can achieve accumulation at any time and space scale, so that the change in the molten pool pressure can achieve the desired technical effect.

[0233] It is understood that the "appropriate parameters" include the angle between the "direction of the floating speed" and the "preparation direction".

[0234] It should be understood that "the first roller rotates about the second roller axis," where "rotation" means: during the relative motion between the two rollers, the first roller moves in a circular motion about the second roller axis (or the second roller body), with the roller gap opening remaining constant. The same applies to "the second roller rotates about the first roller axis."

[0235] It should be understood that "the first roller rotates about any axis parallel to the first roller axis," where "rotation" means that during the relative motion between the two rollers, the first roller performs circular motion about an axis parallel to the first roller axis, resulting in a change in the roller gap opening. Similarly, the same applies to "the second roller rotates about any axis parallel to the second roller axis."

[0236] It can be understood that in the patent application documents of the present invention, during the relative movement between the two rollers, the first roller rotates around the second roller axis (or, the second roller; or, an axis parallel to the first roller axis), where "rotation" refers to circular motion.

[0237] Furthermore, in a roller gap floating method of a double-roller thin strip process, during one of the first rotations, with the second roller as a reference, the direction of the speed of the first roller changes continuously with time.

[0238] It can be understood that during a first rotation, if "the direction of the first roller's velocity continuously changes over time, with the second roller as a reference," then the motion trajectory of the first roller, with the second roller as the reference, is a curve. For example, if the second roller is stationary relative to the ground and the first roller rotates around it, then the motion trajectory of the first roller, with the second roller as the reference, is a circular arc.

[0239] It can be understood that "the second roller is stationary with respect to the ground, and the first roller rotates around the second roller, then, with the second roller as a reference, the motion trajectory of the first roller is a circular arc" is a situation where "with the second roller as a reference, the direction of the speed of the first roller changes continuously with time"; in the case of "with the second roller as a reference, the direction of the speed of the first roller changes continuously with time", the motion trajectory of the first roller can also be an elliptical arc, a parabola, a hyperbola, a trigonometric function, other curves that conform to functional laws, or any irregular curve, etc.

[0240] Furthermore, a device for a roll gap floating method applied to a double-roll thin strip process is provided, the device comprising a first roll body, a second roll body, a first bearing seat, and a second bearing seat; the bearing of the first roll body is installed in the first bearing seat, and the bearing of the second roll body is installed in the second bearing seat, the device also comprises a curvature adjustment track, an angle adjustment track and an outer track, the first bearing seat and\or the second bearing seat are movably arranged on the curvature adjustment track, the curvature adjustment track is movably arranged on the angle adjustment track, and the angle adjustment track is movably arranged on the outer track.

[0241] Furthermore, in a device for a roller gap floating method applied to a double-roll thin strip process, the first bearing seat and\or the second bearing seat are in contact with the curvature adjustment track and can generate relative motion, forming a kinematic pair; the curvature adjustment track is in contact with the angle adjustment track and can generate relative motion, forming a kinematic pair; the angle adjustment track is in contact with the outer track and can generate relative motion, forming a kinematic pair.

[0242] Furthermore, in a device for a roller gap floating method applied to a double-roll thin strip process, the first bearing seat, the second bearing seat, the curvature adjustment track, the angle adjustment track, and the outer track are main components, and one or more sub-components are arranged between two adjacent main components. The sub-components and the adjacent main components form a kinematic pair to allow for more complex and / or more precise movements.

[0243] Furthermore, in an apparatus for a roll gap floating method applied to a twin-roll thin strip process, two adjacent sub-components between two adjacent main components form a kinematic pair to allow for more complex and / or more precise motion.

[0244] It should be noted that in the patent application document of the present invention, there are multiple equivalent expressions for kinematic pairs, including:

[0245] "The movement of A on B constitutes a motion pair";

[0246] “A and B form a moving pair”;

[0247] "The movable connection (or, connection) of A moving on B, forming a kinematic pair";

[0248] "The movable connection between A and B that produces relative motion constitutes a kinematic pair."

[0249] It should be noted that "A" and "B" both represent components and can be replaced by specific component names.

[0250] It should be noted that the connotation of "selective movement" proposed in the patent application document of the present invention is: controlling the roll gap to produce preferential floating according to the alloy composition; "preference" refers to the effect of the floating process of the roll gap on the kiss angle.

[0251] The inventors' current research indicates that for most steel materials and countless high-value nonferrous metals, the roll gap floating method must be "selected": either to facilitate the stable formation of the kiss angle or to prevent excessive development of the kiss angle. The fundamental reasons for this "selection" are the shear-thinning properties of semi-solid metals and the pursuit of production efficiency.

[0252] Although the twin-roll thin strip process was proposed around 1845, the semi-solid shear thinning behavior in the molten pool and the resulting Figure 2 The Kiss angle shown is discovered by the inventors for the first time.

[0253] The advantages of the method proposed in the patent application document of the present invention include:

[0254] It is conducive to real-time control. By causing the roller tightening force to fluctuate slightly, it can prevent the roller tightening force from increasing or decreasing continuously with a very weak trend over a relatively long time span, which would bring unnecessary psychological pressure to the operator.

[0255] The so-called "strategy" is the "strategy" of roll gap floating that can change the molten pool pressure;

[0256] For materials with a narrow two-phase region, the kiss angle can be formed, which can prevent the pressure in the molten pool from connecting with the unsolidified core of the billet leaving the molten pool, thus avoiding billet defects such as "ridges", "snake eggs" and "egg-filled pancakes".

[0257] For materials with a wide two-phase region, it can promote the renewal of kiss angle materials, inhibit the rapid development of the kiss angle, reduce the pressure peak when the long-range shear thinning interface collapses, and prevent various process stability problems such as side sealing plate leakage, side sealing plate damage, tape jamming, tape breakage, cracks, etc. caused by excessively high molten pool pressure peaks, as well as shortened service life of key components;

[0258] Eliminate the "bright line" across the blank;

[0259] Reduce vibration of twin-roll thin strip caster;

[0260] Prepare small batches of high-end materials;

[0261] It is expected to realize the preparation of thin strips of metal materials with a wide two-phase region;

[0262] It is expected to realize the preparation of thin strips of metal materials with extremely narrow two-phase regions;

[0263] The technical solution proposed in the patent application document of the present invention can be used to prepare steel thin strips, non-ferrous metal thin strips, etc. using a double-roll thin strip process, such as: composite thin strips (for example, copper-aluminum composite thin strips; for example, titanium-aluminum composite thin strips), aluminum alloy thin strips (for example, seventh series aluminum alloys; for example, sixth series aluminum alloys), silicon steel thin strips (for example, silicon steel with a silicon content exceeding 5%), Invar alloy thin strips, copper alloy thin strips (for example, Cu-15Ni-8Sn; for example, Cu-9Ni-6Sn), high entropy alloy thin strips, composite rods, composite tubes, composite plates (for example, 10 mm thick composite alloy plates). BRIEF DESCRIPTION OF THE DRAWINGS

[0264] Figure 1 Shown is a schematic diagram of the traditional understanding of the development process of the solidifying shell in the molten pool in the field.

[0265] Figure 2 The figure shows the actual experimental results obtained by implementing the kiss angle measurement method on a laboratory twin-roll thin strip caster.

[0266] Figure 3 Shown is a theoretical schematic diagram of the experimental results obtained by implementing the kiss angle measurement method on a laboratory twin-roll thin strip caster.

[0267] Figure 4 Shown is a schematic diagram of the zero-angle roll gap bidirectional floating method in the prior art.

[0268] Figure 5 Shown is a schematic diagram of a vertical roller gap bidirectional floating method in the prior art.

[0269] Figure 6 Shown is a schematic diagram of the inclined roller gap bidirectional floating method in the prior art.

[0270] Figure 7 Shown is a schematic diagram of a fixed-gap roll gap bidirectional floating method in the prior art.

[0271] Figure 8 Shown is a schematic diagram of the molten pool transport process in the absence of a significant rolling process or the absence of a rolling process, which is a quasi-periodic transport process in the molten pool.

[0272] Figure 9 It is a schematic diagram of the formation and convergence of long-range shear thinning interface and kiss point\angle produced by the quasi-periodic transport process in the molten pool proposed by the inventor.

[0273] Figure 10 Shown is a schematic diagram of the long-range shear thinning interface development and kiss angle development in the quasi-periodic transport process in the molten pool proposed by the inventors.

[0274] Figure 11 Shown is a schematic diagram of the long-range shear thinning interface collapse and kiss point\angle disappearance in the quasi-periodic transport process in the molten pool proposed by the inventors.

[0275] Figure 12 Shown is a schematic diagram of the intense rolling stage of the quasi-periodic transport process in the molten pool proposed by the inventors.

[0276] Figure 13 Shown is a schematic diagram of the transport behavior characteristics proposed by the inventors when a long-range shear thinning interface and kiss point\angle exist in the molten pool.

[0277] Figure 14 Shown is a schematic diagram for explaining the reference plane, Nip point, first roll axis, second roll axis, placement plane, preparation direction, reference direction and reference line of a horizontal equal-diameter twin-roll thin strip caster in a natural state.

[0278] Figure 15 The figure shows a schematic diagram for explaining the selective motion caused by a relative motion between two rolls of a horizontal equal diameter twin-roll thin strip caster.

[0279] Figure 16 Shown is a schematic diagram for explaining a selective movement.

[0280] Figure 17 Shown is a schematic diagram for further explaining a selective movement.

[0281] Figure 18 It is a schematic diagram showing that the direction of the floating velocity of the Nip point in embodiment 1 of the present invention is perpendicular to the reference plane.

[0282] Figure 19Schematic diagram showing that the direction of the floating velocity of the Nip point in embodiment 2 of the present invention is obliquely intersecting with the reference plane.

[0283] Figure 20 The figure shows a schematic diagram of the relative motion between the two rollers in Example 3 of the present invention causing the Nip point to move on a circular arc trajectory.

[0284] Figure 21 It is a schematic diagram showing the alternating movement of two rollers in Example 4 of the present invention so that two selective movements occur continuously.

[0285] Figure 22 It is a schematic diagram showing the relative movement between the two rollers in Example 4 of the present invention causing the first selective movement.

[0286] Figure 23 It is a schematic diagram showing the relative movement between the two rollers in Example 4 of the present invention causing the second selective movement.

[0287] Figure 24 It is a schematic diagram showing that the relative movement between the two rollers in Example 5 of the present invention enables two selective movements to occur continuously.

[0288] Figure 25 It is a schematic diagram showing that the “direction of displacement of the Nip point corresponding to the first angle” and the “direction of displacement of the Nip point corresponding to the second angle” in a selective movement of Example 6 of the present invention are perpendicular.

[0289] Figure 26 Shown is a schematic diagram of a partial structure of an apparatus for a roll gap floating method applied to a double-roll thin strip process according to Example 7 of the present invention.

[0290] Figure 27 Shown is a schematic diagram of a partial structure of an apparatus for a roll gap floating method applied to a double-roll thin strip process according to Example 8 of the present invention.

[0291] Figure 28 Shown is a schematic diagram of a partial structure of an apparatus for a roll gap floating method applied to a double-roll thin strip process according to Example 9 of the present invention.

[0292] The corresponding relationship between the figure numbers in the following figures is as follows:

[0293] 1. First roller, 2. Second roller, 3. Roll gap, 4. Long-range shear thinning interface, 5. Molten pool, 6. Flow distribution device, 7. Blank, 8. Reference plane, 9. Direction of gravity, 10. First bearing seat, 11. Second bearing seat, 12. First curvature adjustment track, 13. First angle adjustment track, 14. Outer track, 15. Motion trajectory, 16. Second curvature adjustment track, 17. Second angle adjustment track. Implementation Method

[0294] It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0295] The present invention will now be described in further detail with reference to the accompanying drawings.

[0296] For the sake of convenience, please combine Figure 14 In the patent application document of the present invention, any plane Ω is taken, and the plane Ω is perpendicular to the first roller axis; in a natural state, the plane where the first roller axis and the second roller axis are located is the reference plane 8, and the intersection points of the first roller axis and the second roller axis with the plane Ω are points O1 and O2 respectively.

[0297] Each embodiment of the present invention adopts a horizontal equal-diameter twin-roll thin strip caster. Therefore, in the following embodiments, the reference direction is the same as the gravity direction 9.

[0298] In addition, in the following embodiments: ω represents a vector; |ω| represents the absolute value (or magnitude) of the corresponding vector. Example 1:

[0299] Example 1 of the present invention discloses a roller gap floating method for a double-roll thin strip process, such as Figure 18 shown.

[0300] like Figure 18 As shown, line segment O1O 1-3 Perpendicular to the reference plane 8; point N is the Nip point in the natural state; point O 1-1 , point O 1-2 and point O 1-4 Both are located on line segment O1O 1-3 On the line; points N, N1, N2, N3 and N4 are all on the reference line; point N1 is on line segment O2O 1-1 Above, line segment O2O 1-1 Located on the placement plane 1-1 On; point N2 is located on line segment O2O 1-2 Above, line segment O2O 1-2 Located on the placement plane 1-2 On; point N3 is located on line segment O2O 1-3 Above, line segment O2O 1-3 Located on the placement plane 2-1 On; point N4 is located on line segment O2O 1-4 Above, line segment O2O 1-4 Located on the placement plane 2-2 superior.

[0301] like Figure 18As shown, during a certain period of time in the preparation process, relative movement occurs between the two rollers, so that two selective movements occur continuously; wherein, for the convenience of description, the first selective movement is referred to as the first selective movement, and the other selective movement that occurs later is referred to as the second selective movement.

[0302] like Figure 18 As shown, during the first selective movement, the first roller 1 moves relative to the ground, and the second roller 2 is stationary relative to the ground; first, a first rotation occurs, and the first roller axis starts from point O1 and moves along the line segment O1→O 1-1 Continuous movement to point O 1-1 The Nip point starts from point N and moves along line segment NN1 without stopping to point N1 and stops. The placement plane rotates from plane Ψ0 to plane Ψ without stopping. 1-1 At this point, the first angle ω is generated. 1-1 Then, a second rotation occurs, the first roller from point O 1-1 Starting from point O, along line segment 1-1 O 1-2 Continuous movement to point O 1-2 The Nip point starts from point N1 and moves along the line segment N1N2 without stopping to point N2 and then stops. The placement plane is from plane Ψ 1-1 Rotate to the plane without stopping 1-2 At this point, a second angle ω is generated. 1-2 ; At point O1, point O 1-1 At point O 1-2 At point N, point N1 and point N2, the floating speed is zero; |ω 1-1 |>|ω 1-2 |.

[0303] like Figure 18 As shown, during the second selective movement, the first roller 1 moves relative to the ground, and the second roller 2 is stationary relative to the ground; first, a first rotation occurs, and the first roller axis moves from point O to 1-2 Starting from point O, along line segment 1-2 O 1-3 Continuous movement to point O 1-3 The Nip point starts from point N2 and moves along the line segment N2N3 without stopping to point N3 and then stops. The placement plane is from plane Ψ 1-2 Rotate to the plane without stopping 2-1 At this point, the first angle ω is generated. 2-1 Then, a second rotation occurs, the first roller from point O 1-3 Starting from point O, along line segment 1-3 O 1-4 Continuous movement to point O1-4 The Nip point starts from point N3 and moves along the line segment N3N4 without stopping to point N4 and then stops. The placement plane is from plane Ψ 2-1 Rotate to the plane without stopping 2-2 At this point, a second angle ω is generated. 2-2 At point O 1-3 At point O 1-4 At point N3 and point N4, the floating speed is zero; |ω 2-1 |>|ω 2-2 |.

[0304] like Figure 18 As shown, multiple selective movements occur continuously; in each selective movement, during the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; in each selective movement, during the second rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; in each selective movement, the product of the first inner product and the second inner product is less than zero, and the absolute value of the first angle is greater than the absolute value of the second angle.

[0305] like Figure 18 As shown, the opening of the roll gap 3 varies at all times during the occurrence of the selective movement.

[0306] like Figure 18 As shown, in the first selective movement: the first angle ω 1-1 The direction of the displacement N→N1 of the corresponding Nip point is opposite to the reference direction, and the second angle ω 1-2 The direction of the displacement N1→N2 of the corresponding Nip point is the same as the reference direction; the first angle ω 1-1 The direction of the corresponding Nip point displacement N→N1 and the second angle ω 1-2 The directions of the displacements N1→N2 of the corresponding Nip points are opposite.

[0307] like Figure 18 As shown, in the second selective movement: the first angle ω 2-1 The direction of the corresponding Nip point displacement N2→N3 is opposite to the reference direction, and the second angle ω 2-2 The direction of the corresponding Nip point displacement N3→N4 is the same as the reference direction; the first angle ω 2-1 The direction of the corresponding Nip point displacement N2→N3 and the second angle ω 2-2 The direction of the corresponding displacement of the Nip point N3→N4 is opposite.

[0308] like Figure 18 As shown, in the first selective movement, the first angle ω1-1 The direction of the displacement N→N1 of the corresponding Nip point is parallel to the reference direction, and the second angle ω 1-2 The direction of the displacement N1→N2 of the corresponding Nip point is parallel to the reference direction; in the second selective movement: the first angle ω 2-1 The direction of the displacement N2→N3 of the corresponding Nip point is parallel to the reference direction, and the second angle ω 2-2 The direction of the corresponding displacement N3→N4 of the Nip point is parallel to the reference direction.

[0309] During one selective movement, the maximum absolute value of the first angle is in the range of 0.1 to 1 degree.

[0310] The frequencies of selective movements occurred in the range of 0.05 to 5 Hz.

[0311] like Figure 18 As shown, in the first selective movement: during the first rotation, the angle between the direction of the floating velocity and the reference direction does not change; during the second rotation, the angle between the direction of the floating velocity and the reference direction does not change.

[0312] like Figure 18 As shown, in the second selective movement: the angle between the direction of the floating velocity and the reference direction does not change; during the second rotation, the angle between the direction of the floating velocity and the reference direction does not change.

[0313] Optionally, line segment O1O 1-3 Oblique to the reference plane 8.

[0314] Optionally, the selective movement occurs at a frequency in the range of 0.01 to 0.05 Hz.

[0315] Optionally, the selective movement occurs at a frequency in the range of 5 to 10 Hz.

[0316] A person skilled in the art can directly and without doubt know that in other embodiments, in each selective movement, during the first rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the first inner product is always greater than zero; in each selective movement, during the second rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the second inner product is always less than zero; in each selective movement, the product of the first inner product and the second inner product is less than zero, and the absolute value of the first angle is greater than the absolute value of the second angle.

[0317] In each embodiment of the present invention, a person skilled in the art can readily and unambiguously determine that the scale of the drawings of the first roller 1, the second roller 2, and the roll gap 3 is only to clearly illustrate the relative motion between the two rollers as described in the patent application of the present invention; typically, the diameter of the rollers far exceeds the opening of the roll gap 3. For example, in the process of producing steel strip using a constant diameter twin-roll strip caster, the roller diameter ranges from 400 to 1000 mm, but the opening of the roll gap 3 ranges from 0.5 to 3 mm.

[0318] Under normal circumstances, when using liquid metal to directly prepare a blank 7 of a metal component, there are some different opinions in the relevant field about the upper limit of the opening of the roll gap 3; however, the opening of the roll gap 3 mentioned in the public information that the inventors have been able to find is all below 8 mm; in fact, the upper limit of the opening of the roll gap 3 attempted in industrial practice does not exceed 3 mm, while the diameter of the roller body is above 400 mm; therefore, whether the opening of the roll gap 3 is "8 mm" or "3 mm", it is much smaller than the diameter of the roller body.

[0319] It is understandable that the same is true for the subsequent embodiments. The drawing scales of the first roller body 1, the second roller body 2, the roller gap 3, etc. are obviously different from the actual process. Only in this way can the characteristics of the technical solution mentioned in the patent application document of this invention be clearly demonstrated.

[0320] It is understandable that even without the above description of the drawing scale, a person of ordinary skill in the art can directly and unambiguously understand the schematic diagrams involved in the patent application document of the present invention. Example 2:

[0321] Example 2 of the present invention discloses a roller gap floating method for a double-roller thin strip process, such as Figure 19 shown.

[0322] like Figure 19 As shown, point N is the Nip point in the natural state; vector O1→O2 and vector O1→O 1-1 The angle is θ, θ∈(0 degrees, 90 degrees); point O 1-2 Located on line segment O1O 1-1 On; point N2 is on line segment NN1; point N1 is on line segment O2O 1-1 Above, line segment O2O 1-1 Located on plane Ψ 1-1 On; point N2 is located on line segment O2O 1-2 Above, line segment O2O 1-2 Located on plane Ψ 1-2 superior.

[0323] In Example 2 of the present invention, during a certain period of time during the preparation process, relative movement occurs between the two rollers, so that multiple selective movements occur continuously or partially continuously; wherein a certain selective movement is as follows: Figure 19 shown.

[0324] like Figure 19 As shown, during this selective movement, the second roller 2 is stationary relative to the ground; first, a second rotation occurs, and the first roller axis moves from point O to 1-1 Starting from point O, along line segment 1-1 O1 moves without stopping to point O1 and then stops. Point Nip moves without stopping from point N1 along line segment NN1 to point N and then stops, to generate a second angle ω 1-1 Then, a first rotation occurs, the first roller starts from point O1 and moves along line segment O1O 1-2 Continuous movement to point O 1-2 The Nip point starts from point N and moves along the line segment NN2 without stopping until it reaches point N2, thus generating the first angle ω. 1-2 ; At point O1, point O 1-1 At point O 1-2 At point N, the speed of the first roller 1 is zero; at point N, point N1, and point N2, the floating speed is zero; during the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; during the second rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; in each selective movement, the product of the first inner product at any time in the first rotation and the second inner product at any time in the second rotation is less than zero; the absolute value of the first angle is greater than the absolute value of the second angle, |ω 1-2 |>|ω 1-1 |.

[0325] like Figure 19 As shown, in this selective movement, the second angle ω 1-1 The direction of the displacement N1→N of the corresponding Nip point is oblique to the reference direction, and the first angle ω 1-2 The direction of the displacement N→N2 of the corresponding Nip point is oblique to the reference direction.

[0326] Optionally, θ∈(90 degrees, 180 degrees).

[0327] Optionally, θ=120 degrees; or, θ=145 degrees. Example 3:

[0328] Example 3 of the present invention discloses a roller gap floating method for a double-roll thin strip process, such as Figure 20 shown.

[0329] like Figure 20 As shown in the figure, "arc 1" is an arc with point O2 as the center; point O1, point O 1-1 , point O 1-2 , point O 1-3 and point O 1-4 All of them are located on "arc 1"; "arc 2" is an arc with point O2 as the center; points N, N1, N2, N3 and N4 are all located on "arc 2"; point N is the Nip point in the natural state; point N1 is located on line segment O 1-1 On O2, line segment O 1-1 O2 is located in plane Ψ 1-1 On; point N2 is located on line segment O 1-2 On O2, line segment O 1-2 O2 is located in plane Ψ 1-2 On; point N3 is located on line segment O 1-3 On O2, line segment O 1-3 O2 is located in plane Ψ 2-1 On; point N4 is located on line segment O 1-4 On O2, line segment O 1-4 O2 is located in plane Ψ 2-2 superior.

[0330] In Example 3 of the present invention, Figure 20 As shown, during a certain period of time in the preparation process, relative movement occurs between the two rollers, so that the two selective movements occur continuously.

[0331] like Figure 20 As shown, the first rotation of the first selective movement occurs: the first roller body 1 rotates clockwise around the second roller axis with a constant rotation radius, so that the first roller axis starts from point O1 and moves along "arc 1" without stopping to point O 1-1 The Nip point starts from point N and moves along the "arc 2" without stopping to point N1 and then stops; the placement plane rotates from plane Ψ0 to plane Ψ 1-1 At this point, the first angle ω is generated. 1-1 During the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; at point O1 and point O 1-1 At point N, the speed of the first roller body 1 is zero; at point N and point N1, the effective speed is zero and the floating speed is zero.

[0332] like Figure 20 As shown, the second rotation in the first selective movement occurs: the first roller body 1 rotates counterclockwise around the second roller axis with a constant rotation radius, so that the first roller axis moves from point O to 1-1 Start from point O and move along the arc 1 without stopping to point O 1-2The Nip point starts from point N1 and moves along the "arc 2" without stopping to point N2 and then stops; the placement plane starts from plane Ψ 1-1 Rotate to the plane without stopping 1-2 At this point, a second angle ω is generated. 1-2 During the second rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; |ω 1-1 |>|ω 1-2 |; at point O 1-1 At point O 1-2 At point N1 and point N2, the effective speed is zero and the floating speed is zero.

[0333] like Figure 20 As shown, the second rotation in the second selective motion occurs: the first roller body 1 rotates counterclockwise around the second roller axis with a constant rotation radius, so that the first roller axis moves from point O to 1-2 Start from point O and move along the arc 1 without stopping to point O 1-3 The Nip point starts from point N2 and moves along the "arc 2" without stopping to point N3 and then stops; the placement plane starts from plane Ψ 1-2 Rotate to the plane without stopping 2-1 At this point, a second angle ω is generated. 2-1 During the second rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; at point O 1-2 At point O 1-3 At point N2 and point N3, the floating speed is zero.

[0334] like Figure 20 As shown, the first rotation of the second selective movement occurs: the first roller body 1 rotates counterclockwise around the second roller axis with a constant rotation radius, so that the first roller axis moves from point O to 1-3 Start from point O and move along the arc 1 without stopping to point O 1-4 The Nip point starts from point N3 and moves along the "arc 2" without stopping to point N4 and then stops; the placement plane starts from plane Ψ 2-1 Rotate to the plane without stopping 2-2 At this point, the first angle ω is generated. 2-2 During the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; |ω 2-2 |>|ω 2-1 |; at point O 1-3 At point O 1-4At point N3 and point N4, the effective speed is zero and the floating speed is zero.

[0335] like Figure 20 As shown, during the first rotation, the direction of the floating speed is always opposite to the direction of the preparation speed; during the second rotation, the direction of the floating speed is always the same as the direction of the preparation speed.

[0336] like Figure 20 As shown, during the first rotation and the second rotation, the direction of the floating speed is always perpendicular to the placement plane.

[0337] In each selective movement, the product of the first inner product and the second inner product is less than zero.

[0338] An absolute value of the first angle is in the range of 0.01 to 2 degrees.

[0339] The frequencies of selective movements ranged from 0.01 to 10 Hz.

[0340] During the entire time when the first selective movement occurs, the opening of the roll gap 3 is constant; during the entire time when the second selective movement occurs, the opening of the roll gap 3 is constant.

[0341] Optionally, during a relative motion between the two rollers, one roller moves relative to the ground and the other roller is stationary relative to the ground, and the trajectory of the moving roller is a continuous arc or curve; during a portion of the time when the relative motion between the two rollers occurs, the moving roller rotates around the stationary roller; that is, during a portion of the time when the relative motion between the two rollers occurs, the opening of the roller gap 3 is constant. Example 4:

[0342] Example 4 of the present invention discloses a roller gap floating method for a double-roll thin strip process, such as Figures 21 to 23 shown.

[0343] like Figures 21 to 23 As shown, during a certain period of time in the process of preparing the blank 7, relative movement occurs between the two rollers, so that the two selective movements occur continuously.

[0344] like Figure 21 As shown in the figure, during the floating process of the roller gap 3, the speed directions of the first roller body 1 and the second roller body 2 are both perpendicular to the reference plane 8; during the first selective movement, the movement law of the first roller axis, the second roller axis and the Nip point is as follows Figure 22 As shown; during the second selective movement, the movement rules of the first roller, the second roller and the Nip point are as follows: Figure 23 shown.

[0345] like Figure 22 As shown, line segment O1O 1-1 Perpendicular to the reference plane 8; point N is the Nip point in the natural state; point O 1-1 Located on line segment O1O 1-2 On the straight line; point N 1-1 Located on line segment NN 1-2 On the straight line; point N, point N 1-1 and point N 1-2 Both are located on the reference line; point N 1-1 Located on line segment O2O 1-1 Above, line segment O2O 1-1 Located on plane Ψ 1-1 Up; point N 1-2 Located on line segment O2O 1-2 Above, line segment O2O 1-2 Located on plane Ψ 1-2 superior.

[0346] like Figure 23 As shown, line segment O2O 2-1 Perpendicular to the reference plane 8; point N is the Nip point in the natural state; point O 2-1 Located on line segment O2O 2-2 On the straight line; point N 2-1 Located on line segment NN 2-2 On the straight line; point N, point N 2-1 and point N 2-2 Both are located on the reference line; point N 2-1 Located on line segment O 1-2 O 2-1 On line segment O 1-2 O 2-1 Located on plane Ψ 2-1 Up; point N 2-2 Located on line segment O 1-2 O 2-2 On line segment O 1-2 O 2-2 Located on plane Ψ 2-2 superior.

[0347] like Figure 22 As shown, first, a first rotation in the first selective motion occurs: the second roller body 2 is stationary relative to the ground; the first roller axis starts from point O1 and moves along line segment O1O 1-1 Continuous movement to point O 1-1 Stop after the Nip point starts from point N and goes along line segment NN 1-1 Continuous movement to point N 1-1 After stopping, the placement plane rotates from plane Ψ0 to plane Ψ without stopping 1-1 At this point, the first angle ω is generated. 1-1 .

[0348] like Figure 22 As shown, then, a second rotation in the first selective movement occurs: the first roller moves from point O to 1-1 Starting from point O, along line segment 1-1 O 1-2 Continuous movement to point O 1-2 Stop after Nip point from point N 1-1 Starting from point N 1- 1N 1-2 Continuous movement to point N 1-2 Stop after placing; place the plane from the plane 1-1 Rotate to the plane without stopping 1-2 At this point, a second angle ω is generated. 1-2 .

[0349] like Figure 22 As shown, at point O1, point O 1-1 At point O 1-2 At point N, the speed of the first roller 1 is equal to zero; at point N 1-1 and point N 1-2 At this point, the effective speed is zero and the floating speed is zero; during the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; during the second rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; the first angle ω 1-1 The absolute value of the second angle ω 1-2 The absolute value of .

[0350] like Figure 23 As shown, first, a first rotation in the second selective motion occurs: the first roller body 1 is stationary relative to the ground; the second roller axis starts from point O2 and moves along the line segment O2O 2-1 Continuous movement to point O 2-1 Stop after Nip point from point N 1-2 Starting from point N 1-2 N 2-1 Continuous movement to point N 2-1 Stop after placing; place the plane from the plane 1-2 Rotate to the plane without stopping 2-1 At this point, the first angle ω is generated. 2-1 .

[0351] like Figure 23 As shown, then, a second rotation in the second selective movement occurs, and the first roller axis moves from point O to 2-1 Starting from point O, along line segment 2-1 O 2-2 Continuous movement to point O 2-2 Stop after Nip point from point N2-1 Starting from point N 2- 1N 2-2 Continuous movement to point N 2-2 Stop after placing; place the plane from the plane 2-1 Rotate to the plane without stopping 2-2 At this point, a second angle ω is generated. 2-2 .

[0352] like Figure 23 As shown, at point O2, point O 2-1 At point O 2-2 At point N, the speed of the second roller 2 is equal to zero; 1-2 Point N 2-1 and point N 2-2 At this point, the effective speed is zero and the floating speed is zero; during the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; during the second rotation, the inner product of the floating speed and the preparation speed is always greater than zero, that is, the second inner product is always greater than zero; the first angle ω 2-1 The absolute value of the second angle ω 2-2 The absolute value of .

[0353] Repeat the above-mentioned movement mode until the preparation process is completed or the process is terminated unexpectedly.

[0354] It is understandable that the “end of the preparation process” may be caused by the “end of the process” or by a predetermined change in the composition of the prepared green body 7 .

[0355] It is understandable that a person skilled in the art can directly and without doubt know that "the process is over"; "the process is over" can be determined by "the blank 7 is no longer removed from the molten pool 5"; "the process is over" can also be determined by "no more material for preparing the blank 7 is added to the molten pool 5".

[0356] It is understandable that a person of ordinary skill in the art can directly and unambiguously understand that "the composition of the prepared blank 7 undergoes a predetermined change"; two or more blanks 7 with different compositions can be prepared in a single process. For example, in a single process, a blank 7 with a silicon steel composition is first prepared. After the silicon steel blank 7 is prepared, the composition of the molten metal entering the molten pool 5 is changed to prepare a stainless steel blank 7 until the process is completed; the "silicon steel blank 7" and the "stainless steel blank 7" are blanks 7 with different compositions.

[0357] It can be understood that the above-mentioned "one process" includes two "preparation processes"; one "preparation process" refers to a "process in which the composition of the primary blank 7 does not change"; in the above-mentioned "one process", the preparation of the "blank 7 with silicon steel composition" and the "blank 7 with stainless steel composition" are completed successively, which belongs to two preparation processes; that is, at least "one preparation process" occurs in the "one process".

[0358] It can be understood that "two or more blanks 7 with different compositions can be prepared in one process" is to avoid the cost of replacing the flow distribution device 6 and / or the side sealing device, and to improve equipment utilization so as to reduce production costs as much as possible.

[0359] like Figure 21 As shown, in one selective movement, between a first rotation and a second rotation that occur adjacently, no relative movement occurs between the two rollers.

[0360] In each selective movement, the product of the first inner product and the second inner product is less than zero.

[0361] Optionally, during a selective movement, the direction of the speed of the first roller 1 and / or the second roller 2 at any moment is oblique to the reference direction; and the angle of the oblique intersection can be arbitrary; preferably, the oblique angle is in the range of 15 to 30 degrees.

[0362] Optionally, during a selective movement, the direction of the velocity of the first roller 1 and / or the second roller 2 at any moment is oblique to the reference direction, and the angle between the movement direction of the first roller 1 or the second roller 2 and the reference direction is λ: 45 degrees <λ < 90 degrees, or 90 degrees <λ < 135 degrees.

[0363] Optionally, during a selective movement, the floating speed is any continuous or discontinuous function, as long as the absolute value of the first angle is greater than the absolute value of the second angle.

[0364] Optionally, in multiple selective movements between the two rollers, the absolute value of the first angle is the same in each selective movement.

[0365] Alternatively, as Figure 21 As shown, the relative movement of the first roller 1 and the second roller 2 can be performed simultaneously or partially overlapped; after the process of preparing the blank 7 is completed, the first roller 1 and the second roller 2 are adjusted back to the reference plane 8; that is, during the entire preparation process, the relative movement between the two rollers only produces selective movement, and the selective movement occurs continuously.

[0366] The method shown in Example 4 of the present invention can be used to prepare small batches of high-end metal materials or test process parameters in the laboratory. Example 5:

[0367] Example 5 of the present invention discloses a roller gap floating method for a double-roll thin strip process, such as Figure 24 shown.

[0368] like Figure 24 As shown, point N is the Nip point in the natural state; "Arc 1" and "Arc 2" are both arcs with point O2 as the center; point O1, point O 1-2 and point O 1-4 are all on "arc 1"; points N, N2 and N4 are all on "arc 2"; point N1 is on line segment O 1-1 On O2, line segment O 1-1 O2 is located in plane Ψ 1-1 On; point N2 is located on line segment O 1-2 On O2, line segment O 1-2 O2 is located in plane Ψ 1-2 On; point N3 is located on line segment O 1-3 On O2, line segment O 1-3 O2 is located in plane Ψ 2-1 On; point N4 is located on line segment O 1-4 On O2, line segment O 1-2 O4 is located on plane Ψ 2-2 superior.

[0369] like Figure 24 As shown, during a certain period of time in the preparation process, the relative movement between the two rollers causes the placement plane to undergo multiple selective movements; the first selective movement occurs from t0 to t3; the second selective movement occurs from t4 to t7; in each selective movement, the product of the first inner product and the second inner product is less than zero, and the absolute value of the first angle is greater than the absolute value of the second angle; in each selective movement, during the first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero.

[0370] like Figure 24 As shown, from time t0 to t1, relative motion occurs between the two rollers, so that a first rotation in the first selective motion occurs: the second roller 2 is stationary relative to the ground; the first roller 1 is controlled to move relative to the ground; during the movement of the first roller 1, the speed of the first roller 1 is not equal to zero, and the direction of the speed of the first roller 1 does not change, so that the first roller axis starts from point O1 and moves along line segment O1O 1-1 Continuous movement to point O 1-1 Stop at point O1 and point O 1-1At the start and end of the relative motion between the two rollers, the speed of the first roller 1 is zero; the Nip point starts from point N and moves along the line segment NN1 without stopping to point N1 and then stops; the placement plane rotates from plane Ψ0 to plane Ψ 1-1 At this point, a first angle ω is generated. 1-1 .

[0371] like Figure 24 As shown, from time t2 to t3, relative motion occurs between the two rollers, so that a second rotation occurs in the first selective motion: the second roller 2 is stationary relative to the ground; the first roller 1 is controlled to move relative to the ground; during the movement of the first roller 1, the speed of the first roller 1 is not equal to zero, and the direction of the speed of the first roller 1 does not change, so as to allow the first roller axis to move from point O 1-1 Starting from point O, along line segment 1-1 O 1-2 Continuous movement to point O 1-2 Stop at point O 1-1 At point O 1-2 At the start and end of the second relative motion between the two rollers, the speed of the first roller 1 is zero; the Nip point starts from point N1 and moves along the line segment N1N2 without stopping to point N2 and then stops; the placement plane is from plane Ψ 1-1 Rotate to the plane without stopping 1-2 At this point, a second angle ω is generated. 1-2 .

[0372] like Figure 24 As shown, from time t4 to t5, relative motion occurs between the two rollers, so that a first rotation in the second selective motion occurs: the second roller 2 is stationary relative to the ground; the first roller 1 is controlled to move relative to the ground; during the movement of the first roller 1, the speed of the first roller 1 is not equal to zero, and the direction of the speed of the first roller 1 does not change, so as to allow the first roller axis to move from point O 1-2 Starting from point O, along line segment 1-2 O 1-3 Continuous movement to point O 1-3 Stop at point O 1-2 At point O 1-3 At the start and end of the third relative motion between the two rollers, the speed of the first roller 1 is zero; the Nip point starts from point N2 and moves along the line segment N2N3 without stopping to point N3 and then stops; the placement plane is from plane Ψ 1-2 Rotate to the plane without stopping 2-1 At this point, a first angle ω is generated. 2-1 .

[0373] like Figure 24As shown, from time t6 to t7, relative motion occurs between the two rollers, so that a second rotation in the second selective motion occurs: the second roller 2 is stationary relative to the ground; the first roller 1 is controlled to move relative to the ground; during the movement of the first roller 1, the speed of the first roller 1 is not equal to zero, and the direction of the speed of the first roller 1 does not change, so as to allow the first roller axis to move from point O 1-3 Starting from point O, along line segment 1-3 O 1-4 Continuous movement to point O 1-4 Stop at point O 1-3 At point O 1-4 At the start and end of the fourth relative motion between the two rollers, the speed of the first roller 1 is zero; the Nip point starts from point N3 and moves along the line segment N3N4 without stopping to point N4 and then stops; the placement plane is from plane Ψ 2-1 Rotate to the plane without stopping 2-2 At this point, a second angle ω is generated. 2-2 . Example 6:

[0374] Example 6 of the present invention discloses a roller gap floating method for a double-roller thin strip process, such as Figure 25 shown.

[0375] like Figure 25 As shown, point N is the Nip point in the natural state; point N1 is located on line segment O 1-1 On O2, line segment O 1-1 O2 is located in plane Ψ 1-1 On; point N2 is located on line segment O 1-2 On O2, line segment O 1-2 O2 is located in plane Ψ 1-2 Up; line segment O1O 1-1 The line or line segment O 1-1 O 1-2 The straight line where O1 lies, the straight line where line segment NN1 lies, and the straight line where line segment N1N2 lies are all obliquely intersecting with the reference line; 1-1 ⊥O 1-1 O 1-2 ;NN1⊥N1N2.

[0376] like Figure 25 As shown, during a certain period of time in the preparation process, the relative movement between the two rollers causes the placement plane to undergo multiple selective movements; in each selective movement, the product of the first inner product and the second inner product is less than zero, and the absolute value of the first angle is greater than the absolute value of the second angle; in each first rotation, the inner product of the floating speed and the preparation speed is always less than zero, that is, the first inner product is always less than zero; wherein, one selective movement occurs from time t0 to t3.

[0377] like Figure 25 As shown, from time t0 to t1, a relative movement between the two rollers causes the placement plane to undergo a first rotation: the second roller 2 is stationary relative to the ground; the first roller 1 is controlled to move relative to the ground; during the movement of the first roller 1, the speed of the first roller 1 is not equal to zero, and the direction of the speed of the first roller 1 does not change, so that the first roller axis starts from point O1 and moves along line segment O1O 1-1 Continuous movement to point O 1-1 Stop at point O1 and point O 1-1 That is, at the start and end of the relative motion between the two rollers, the speed of the first roller 1 is zero; the Nip point starts from point N, moves along the line segment NN1 without stopping to point N1 and then stops. The displacement of the Nip point is N→N1; the placement plane rotates from plane Ψ0 to plane Ψ without stopping. 1-1 , generating a first angle ω 1-1 ; At the first angle ω 1-1 During the process, the inner product of the floating speed and the preparation speed is always less than zero.

[0378] like Figure 25 As shown, from time t2 to t3, a relative movement between the two rollers causes the placement plane to undergo a second rotation: the second roller 2 is stationary relative to the ground; the first roller 1 is controlled to move relative to the ground; during the movement of the first roller 1, the speed of the first roller 1 is not equal to zero, and the direction of the speed of the first roller 1 does not change, so as to allow the first roller axis to move from point O 1-1 Starting from point O, along line segment 1-1 O 1-2 Continuous movement to point O 1-2 Stop at point O 1-1 At point O 1-2 At the start and end of the second relative motion between the two rollers, the speed of the first roller 1 is zero; the Nip point starts from point N1 and moves along the line segment N1N2 without stopping to point N2 and then stops; the placement plane is from plane Ψ 1-1 Rotate to the plane without stopping 1-2 , generating a second angle ω 1-2 ; During the process of the second angle occurring, the inner product of the floating speed and the preparation speed is always greater than zero.

[0379] like Figure 25 As shown, the first angle ω 1-1 The absolute value of the second angle ω 1-2 The absolute value of .

[0380] like Figure 25 As shown, in this selective movement, the "first angle ω 1-1The corresponding displacement direction of the Nip point N→N1" and the second angle ω 1-2 The direction of the displacement of the corresponding Nip point N1→N2 is perpendicular.

[0381] like Figure 25 As shown, in the selective motion, the product of the first inner product and the second inner product is less than zero. Example 7:

[0382] Example 7 of the present invention discloses a schematic diagram of a partial structure of a twin-roll thin strip casting machine device for a roll gap floating method applied to a twin-roll thin strip process, as shown in FIG. Figure 26 shown.

[0383] like Figure 26 As shown, the twin-roll thin strip casting machine includes a first roll body 1, a second roll body 2, a first bearing seat 10, and a second bearing seat 11; the bearing of the first roll body 1 is installed in the first bearing seat 10, and the bearing of the second roll body 2 is installed in the second bearing seat 11.

[0384] like Figure 26 As shown, the first bearing seat 10 is installed on the first curvature adjustment rail 12, and the first bearing seat 10 can move along the first curvature adjustment rail 12. The movement of the first bearing seat 10 on the first curvature adjustment rail 12 constitutes a kinematic pair; the first curvature adjustment rail 12 is installed on the first angle adjustment rail 13, and the first curvature adjustment rail 12 can move along the first angle adjustment rail 13. The first curvature adjustment rail 12 and the first angle adjustment rail 13 constitute a kinematic pair; the first angle adjustment rail 13 is installed on the outer rail 14, and the first angle adjustment rail 13 can move along the outer rail 14. The first angle adjustment rail 13 and the outer rail 14 constitute a kinematic pair.

[0385] The first bearing seat 10, the first curvature adjustment track 12, the first angle adjustment track 13, and the outer track 14 are the main components. Several sub-components can be set between two adjacent main components. The movement of the sub-components on the adjacent main components constitutes a kinematic pair. Among the two adjacent sub-components, one sub-component and the other sub-component form a kinematic pair to allow for more complex and / or more precise movements. For example: two sub-components A and B are sequentially set between the first bearing seat 10 and the first curvature adjustment track 12; the first bearing seat 10 is adjacent to A, A is adjacent to B, and B is adjacent to the first curvature adjustment track 12; the first bearing seat 10 and A can move relative to each other; A and B can move relative to each other; B and the first curvature adjustment track 12 can move relative to each other; then, the first bearing seat 10 and A form a kinematic pair, A and B form a kinematic pair, and B and the first curvature adjustment track 12 form a kinematic pair.

[0386] In the patent application document of the present invention, the curvature adjustment track can be used to adjust the curvature of the movement path of the roller body, the curvature of the straight line track is infinite, and the straight line is a special curve; the angle adjustment track can be used to control the angular velocity of the roller body movement.

[0387] like Figure 26 As shown, the second bearing seat 11 is arranged on the outer track 14. The second bearing seat 11 can move along the outer track 14. The second bearing seat 11 and the outer track 14 form a kinematic pair.

[0388] like Figure 26 As shown, the projection of the first angle adjustment track 13 on the plane Ω is an arc; an arc refers to a line with a certain curvature; an arc includes a circular arc, an elliptical arc, and a parabola; an arc belongs to a curve; a curve can be decomposed into several arcs.

[0389] Optional, such as Figure 26 As shown, the projection of the first angle adjustment track 13 on plane Ω is an arc. When the first angle adjustment track 13 moves along the outer track 14 to a certain position, the center of curvature of the first angle adjustment track 13 is located on the rotation centerline of the second roller body 2. The "rotation centerline of the second roller body 2" is also the second roller axis.

[0390] like Figure 26 As shown, the method of using the device includes:

[0391] The first angle adjustment track 13 moves along the outer track 14, and the curvature center of the first angle adjustment track 13 coincides with the second roller axis. Then, the first angle adjustment track 13 and the outer track 14 are relatively stationary.

[0392] The first angle adjustment track 13 and the outer track 14 are controlled to remain relatively stationary, with the curvature center of the first angle adjustment track 13 located at the second roller axis; the first curvature adjustment track 12 moves along the first angle adjustment track 13 to achieve the purpose of floating the roller gap 3;

[0393] The first bearing seat 10 and the first curvature adjustment track 12 are controlled to move relative to each other to change the opening of the roll gap 3 , thereby adjusting the thickness of the blank 7 .

[0394] During the process of preparing the blank 7, the center of curvature of the first angle adjustment track 13 is always located on the second roller shaft, the first bearing seat 10 and the first curvature adjustment track 12 are relatively stationary, and the first curvature adjustment track 12 and the first angle adjustment track 13 move relative to each other, so that the fixed opening floating of the roller gap 3 can be achieved, and in theory, the preparation of the blank 7 without thickness fluctuation can be achieved.

[0395] like Figure 26The device shown can be used to implement the floating method of the roller gap 3 shown in Example 4, specifically: control the first angle adjustment track 13 to move along the outer track 14 so that the curvature center of the first angle adjustment track 13 coincides with the rotation axis of the second roller body 2, and then the first angle adjustment track 13 and the outer track 14 are relatively stationary; use the corresponding driving device to drive the first curvature adjustment track 12 to move along the first angle adjustment track 13; the second bearing seat 11 and the outer track 14 remain relatively stationary.

[0396] The driving device includes hydraulic drive and cam drive.

[0397] The outer rail 14 may be disposed on the frame.

[0398] The first roller axis is the rotation center line of the first roller body 1; the second roller axis is the rotation center line of the second roller body 2.

[0399] The term "track" refers to a device that provides guidance for the direction of movement of an object. For example, the term "track" may include a slideway with grooves, a slideway with bosses, a slideway with teeth, or a slideway with balls.

[0400] It should be noted that, in all embodiments of the device involved in the application documents of the present invention, plan views are adopted; therefore, lines that appear to intersect on paper may actually be located in different planes in three-dimensional space, that is, they may not actually intersect. Example 8:

[0401] Example 8 of the present invention discloses a partial structural diagram of a twin-roll thin strip casting machine device for a roll gap floating method applied to a twin-roll thin strip process, as shown in FIG. Figure 27 shown.

[0402] like Figure 27 As shown, the first angle adjustment track 13 is a linear track; the projection of the first angle adjustment track 13 on plane Ω is a straight line. The structures of the first curvature adjustment track 12 and the outer track 14 in Example 11 of the present invention are the same as those in Example 10 of the present invention, and are not repeated here.

[0403] It should be noted that a "linear track" refers to a component that is movably mounted on a linear track. When the component moves along the linear track, the trajectory of the component's centroid or center of gravity is a straight line. In other words, a linear track can be a slideway equipped with bosses, grooves, ball bearings, etc. The same applies to "arc-shaped track," "circular track," and "curved track."

[0404] In order to make the first roller move on the motion track 15 , the first curvature adjustment track 12 needs to move along the first angle adjustment track 13 , and at the same time, the first angle adjustment track 13 needs to move along the outer track 14 .

[0405] like Figure 27 The device shown can be used to implement the floating method of the roller gap 3 described in Example 5 of the present invention, specifically by controlling the first angle adjustment track 13 to move along the outer track 14; at the same time, controlling the first curvature adjustment track 12 to move along the first angle adjustment track 13.

[0406] like Figure 27 The device shown can also be used to implement Figures 4 to 7 The conventional roller gap 3 floating method is shown. Example 9:

[0407] Example 9 of the present invention discloses a partial structural diagram of a twin-roll thin strip casting machine device for a roll gap floating method applied to a twin-roll thin strip process, as shown in FIG. Figure 28 shown.

[0408] like Figure 28 As shown, the first bearing seat 10 is installed on the first curvature adjustment rail 12, and the first bearing seat 10 can move along the first curvature adjustment rail 12; the first curvature adjustment rail 12 is installed on the first angle adjustment rail 13, and the first curvature adjustment rail 12 can move along the first angle adjustment rail 13; the first angle adjustment rail 13 is installed on the outer rail 14, and the first angle adjustment rail 13 can move along the outer rail 14.

[0409] like Figure 28 As shown, the second bearing seat 11 is installed on the second curvature adjustment rail 16, and the second bearing seat 11 can move along the second curvature adjustment rail 16; the second curvature adjustment rail 16 is installed on the second angle adjustment rail 17, and the second curvature adjustment rail 16 can move along the second angle adjustment rail 17; the second angle adjustment rail 17 is installed on the outer rail 14, and the second angle adjustment rail 17 can move along the outer rail 14.

[0410] like Figure 28 The device shown can be used to implement the roll gap 3 floating method shown in Example 5. Specifically, the first curvature adjustment track 12 is driven by a corresponding drive device to move along the first angle adjustment track 13; the second curvature adjustment track 16 is driven by a corresponding drive device to move along the second angle adjustment track 17. The first curvature adjustment track 12 and the second curvature adjustment track 16 move relative to each other; the first bearing seat 10 and the first curvature adjustment track 12 remain relatively stationary or move relative to each other; and the second bearing seat 11 and the second curvature adjustment track 16 remain relatively stationary or move relative to each other.

[0411] In the patent application documents of the present invention, each embodiment adopts a horizontal equal-diameter twin-roll thin strip caster, which is only one form of twin-roll thin strip caster. There are many ways to classify twin-roll thin strip casters: according to the difference in the diameters of the two rollers, twin-roll thin strip casters include equal-diameter, different-diameter, and variable-diameter types; according to the placement of the two rollers, twin-roll thin strip casters include horizontal, inclined, and vertical types; according to the method of drawing out the blanks, twin-roll thin strip casters include drawing out along the direction of gravity, drawing out at an angle less than 180 degrees from the direction of gravity, and drawing out in a direction completely opposite to the direction of gravity. The variable-diameter twin-roll casting process belongs to the field of twin-roll thin strips. The variable-diameter twin-roll thin strip caster refers to a twin-roll thin strip caster in which the diameter of at least one of the two rollers changes along the direction of its roller axis. The variable-diameter twin-roll thin strip process can be used to prepare cladding materials such as composite tubes, composite rods, and composite thin plates.

[0412] It should be further noted that any type of twin-roll thin strip caster can use the embodiments in the patent application document of the present invention.

[0413] The serial numbers of the above embodiments of the present invention are for description only and do not represent the advantages or disadvantages of the embodiments.

[0414] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the description of the patent application documents of the present invention, ordinary technicians can still modify or replace the specific implementation methods of the present invention with equivalents, but these modifications or changes do not deviate from the scope of protection of the pending claims of the present application.

Claims

1. A roll gap floating method for a twin-roll thin strip process, wherein a roll system is arranged on a twin-roll thin strip casting machine, the roll system comprises a first roll body and a second roll body arranged opposite to each other for preparing a blank, the roll axis of the first roll body is called the first roll axis, and the roll axis of the second roll body is called the second roll axis; the plane where the first roll axis and the second roll axis are located is called the placement plane of the roll system; the minimum distance between the first roll body and the second roll body is called the roll gap; the midpoint of the roll gap is called the Nip point; the moving speed of the blank at the Nip point is called the preparation speed; the moving speed of the Nip point caused by the relative movement between the first roll body and the second roll body is called the floating speed of the Nip point; the first roll body and\or the second roll body are movably arranged on the twin-roll thin strip casting machine to allow the roll gap to be adjustable; characterized in that The method comprises the steps of: during the preparation process, controlling the relative movement between the first roller and the second roller so that the placement plane undergoes multiple selective movements; in each selective movement, the placement plane undergoes a first rotation and a second rotation adjacent to each other; During each occurrence of the first rotation, the inner product of the floating speed and the preparation speed is called a first inner product; during each occurrence of the second rotation, the inner product of the floating speed and the preparation speed is called a second inner product; In the multiple selective movements, the first inner product is always greater than zero, or, in the multiple selective movements, the first inner product is always less than zero; In each of the selective movements, the product of the first inner product and the second inner product is less than zero; the angle through which the placement plane is rotated by each first rotation is called a first angle, and the angle through which the placement plane is rotated by each second rotation is called a second angle; in each of the selective movements, the absolute value of the first angle is greater than the absolute value of the second angle; and the multiple selective movements occur continuously or partially continuously.

2. The roll gap floating method of a twin-roll thin strip process according to claim 1, characterized in that: In one selective movement, the ratio of the absolute value of the second angle to the absolute value of the first angle is in the range of 0.05 to 0.95; and\or, the frequency of occurrence of the selective movement is in the range of 0.01 to 10 Hz.

3. The roll gap floating method of a twin-roll thin strip process according to claim 1, characterized in that: In a natural state, the direction of the movement speed of the blank at the Nip point is called a reference direction; in one selective movement, the direction of the displacement of the Nip point corresponding to the first angle is oblique to or parallel to the reference direction.

4. The roll gap floating method of a twin-roll thin strip process according to claim 1, characterized in that: In each of the selective movements, the first inner product is less than zero.

5. The roll gap floating method of a twin-roll thin strip process according to claim 1, characterized in that: In one selective movement, the direction of displacement of the Nip point corresponding to the first angle is perpendicular to the direction of displacement of the Nip point corresponding to the second angle; or, in one selective movement, the direction of displacement of the Nip point corresponding to the first angle is opposite to the direction of displacement of the Nip point corresponding to the second angle.

6. The roll gap floating method of a twin-roll thin strip process according to claim 1, characterized in that: In a natural state, the plane where the first roller and the second roller are located is called a reference plane; the relative motion between the two rollers that generates the first rotation and / or the second rotation includes one or more of the following motion modes: the first roller rotates around the second roller; the second roller rotates around the first roller; the direction of the speed of the first roller and / or the direction of the speed of the second roller are perpendicular to the reference plane; the direction of the speed of the first roller and / or the direction of the speed of the second roller are oblique to the reference plane; the first roller rotates around any axis parallel to the first roller; the second roller rotates around any axis parallel to the second roller.

7. The roll gap floating method of a twin-roll thin strip process according to claim 1, characterized in that: During part or all of the time during which the selective movement occurs, the opening of the roller gap is constant.

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