Electromagnetic horizontal continuous casting device and continuous casting method for high-tin wide-width tin-phosphor bronze alloy strip

Abstract

The present invention provides an electromagnetic horizontal continuous casting device and continuous casting method for a high-tin wide-width tin-phosphor bronze alloy strip. The continuous casting device includes a horizontal continuous casting furnace group insulation furnace, a crystallizer, a stirring part and an AC power supply. This scheme can avoid major changes in the horizontal continuous casting crystallizer due to the introduction of a magnetic field generator, thereby making the magnetic field generator and the horizontal continuous casting crystallizer integrated, simpler and easier to install. The magnetic field generator is fixed under the frame baffle, and is rammed and sintered together with the ramming material to increase the firmness of the crystallizer and the immovability of the magnetic field generator, ensuring that the magnetic field generator and the insulation furnace are isolated at a safe distance due to refractory materials, further reducing safety hazards. Placing the magnetic field generator on the upper side of the graphite plate can greatly reduce the influence of the magnetic field generator on the melt flow field and temperature field at the crystallization front due to cooling during operation. The magnetic field generator can ensure that the stirring force is evenly distributed on the entire cross section, and uniform forced stirring can be obtained.

Description

Technical Field

[0001] The invention relates to the technical field of nonferrous metal processing, and in particular to an electromagnetic horizontal continuous casting device and a continuous casting method for a high-tin and wide-width tin-phosphor bronze alloy strip. Background Art

[0002] Tin-phosphor bronze is a commonly used elastic copper alloy. It can obtain good mechanical properties through the action of Sn and P elements and cold working hardening. It is easy to process and punch into elastic components of various complex shapes. It not only has excellent elastic properties, but also has the characteristics of corrosion resistance, wear resistance and non-magnetic. It is the most widely used and most widely used elastic material among copper-based elastic alloy materials. In particular, tin-phosphor bronze with high tin content has more excellent strength, elasticity, anti-magnetism, wear resistance and corrosion resistance.

[0003] At present, tin-phosphor bronze casting is mainly prepared and processed by the traditional copper alloy horizontal continuous casting method. However, due to the solidification characteristics of tin-phosphor bronze, as the tin content increases, the reverse segregation and microsegregation phenomena become more serious, and the ingots will have surface cracks, forming weak bonding surfaces, coarse columnar crystals and a large amount of looseness, which seriously affect the subsequent processing performance of the ingots and the yield of the products. At the same time, the horizontal continuous casting strip billet has gradually developed from the original 430mm casting to a wider width of 650mm and above, which further brings about problems such as uneven distribution of melt flow field and temperature field, increased probability of slag rolling, and increased difficulty in casting, which leads to more serious loss of graphite plates and increased probability of graphite plate cracking.

[0004] Patent CN101386060B discloses a novel electromagnetic assisted casting method and device for copper and copper alloy strips. This technology is mainly used in the continuous casting of 430mm wide strips, which can produce forced stirring, thereby achieving the purpose of consistent segregation and grain refinement. However, this technology does not consider the application of a wider range, resulting in the inapplicability of the magnetic field generator of this invention when applied to a wide width, and the stirring and refinement effect cannot be achieved. Patent CN100581682C discloses a horizontal electromagnetic continuous casting device for copper alloy strips. This technology can achieve the purpose of grain refinement and segregation suppression by applying a traveling wave magnetic field, but this technology does not work on wide-width and high-tin phosphor bronze, which is prone to safety hazards and has relatively poor use effects.

[0005] In summary, the existing electromagnetic horizontal continuous casting device cannot carry out electromagnetic horizontal continuous casting on wide-width, high-tin tin-phosphorus bronze alloys in a targeted manner, and cannot solve the problems of uneven melt flow field and temperature field caused by the wide width, and oxidation and cracking of the graphite plate due to the addition of a magnetic field generator. Summary of the invention

[0006] The present invention provides an electromagnetic horizontal continuous casting device and continuous casting method for a high-tin wide-width tin-phosphor bronze alloy strip, thereby improving the problems of coarse grain structure and aggravated segregation caused by uneven melt flow field and temperature field when the width and tin are high, further improving the oxidation and cracking problems of the graphite plate, and increasing the service life of the graphite plate.

[0007] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, the present invention provides an electromagnetic horizontal continuous casting device for high-tin and wide-width tin-phosphor bronze alloy strip, comprising a horizontal continuous casting furnace group insulation furnace, a crystallizer, a stirring part and an AC power supply, wherein the crystallizer is arranged at the furnace mouth of the horizontal continuous casting furnace group insulation furnace, the crystallizer comprises a graphite plate, a water-cooled copper sleeve, a steel sleeve and a frame baffle, the water-cooled copper sleeve is arranged around the graphite plate, the steel sleeve is arranged around the water-cooled copper sleeve, and the frame baffle is located between the horizontal continuous casting furnace group insulation furnace and the water-cooled copper sleeve; the stirring part is fixed in the cavity of the frame baffle, and the stirring part and the crystallizer ramming material are rammed and sintered to form a whole; the stirring part comprises a traveling wave magnetic field generator and an integrally formed stainless steel shell, the magnetic pole of the traveling wave magnetic field generator is arranged in a multi-stage straight line according to a width of 650 to 700 mm, the outer wall of the traveling wave magnetic field generator is closed by the stainless steel shell, and the cavity between the traveling wave magnetic field generator and the stainless steel shell is used to pass cooling water.

[0008] Furthermore, the Shore hardness of the graphite plate is 43-50 HSD and the density is 1.9-2.2 g / cm 3 , the thermal conductivity is 400~420W / , and the fit degree between the matching surface of the graphite plate and the water-cooled copper sleeve is ≥95%.

[0009] Furthermore, the current delivered by the AC power supply to the traveling wave magnetic field generator is 380V three-phase AC, and the phase and direction change cycle of the three-phase AC is 3.5s.

[0010] Furthermore, the width of the high-tin wide-width tin-phosphor bronze alloy strip is 650-700 mm and the thickness is 15 mm-17 mm.

[0011] Furthermore, the mass percentage composition of the high-tin wide-width tin-phosphor bronze alloy strip is: Sn content 8.0-11.0wt%, P content 0.01-0.10wt%, Zn content ≤0.2wt%, Fe content ≤0.1wt%, and the rest is Cu and impurity elements.

[0012] Furthermore, the distance L1 between the stirring part and the holding furnace of the horizontal continuous casting furnace group is 40-50 mm, and the distance L2 between the stirring part and the center line of the graphite plate is 50-70 mm.

[0013] According to another aspect of the present invention, a continuous casting method is provided, and the continuous casting method is applied to the above-mentioned electromagnetic horizontal continuous casting device for high-tin wide-width tin-phosphor bronze alloy strip billets, and the continuous casting method comprises: when the melt temperature in the insulation furnace of the horizontal continuous casting furnace group reaches the set temperature, starting the horizontal continuous casting traction machine, the horizontal continuous casting traction machine drives the traction plate to move, and the traction plate casts at a set speed; after the initial casting is stable, starting the AC power supply to make the traveling wave magnetic field generator work, the operating frequency of the traveling wave magnetic field generator is 5~50HZ, the current intensity is 5~30A, the Lorentz force exerted on the melt by the traveling wave magnetic field generator is 10~50Gs, and the melt located at the crystallization front of the graphite plate is forcibly stirred under the action of the Lorentz force to break the dendrites.

[0014] Furthermore, the temperature is set at 1160-1190° C., and the speed is set at 150-180 mm / min.

[0015] Furthermore, the continuous casting method adopts a pull-stop-withdraw-pull process, wherein the pulling speed is 15 to 25 mm / s, the pause time is 1 to 3S, and the withdrawing speed is 8 to 10 mm / s.

[0016] Furthermore, the strip produced by the continuous casting method is a high-tin wide-width tin-phosphor bronze alloy strip, the outlet temperature of the high-tin wide-width tin-phosphor bronze alloy strip center is 350°C to 380°C, and the lateral temperature difference of the entire strip is 20°C to 50°C.

[0017] By applying the technical solution of the present invention, an electromagnetic horizontal continuous casting device for high-tin and wide-width tin-phosphor bronze alloy strip is provided, comprising a horizontal continuous casting furnace group insulation furnace, a crystallizer, a stirring part and an AC power supply, wherein the crystallizer is arranged at the furnace mouth of the horizontal continuous casting furnace group insulation furnace, the crystallizer comprises a graphite plate, a water-cooled copper sleeve, a steel sleeve and a frame baffle, the water-cooled copper sleeve is arranged around the graphite plate, the steel sleeve is arranged around the water-cooled copper sleeve, and the frame baffle is located between the horizontal continuous casting furnace group insulation furnace and the water-cooled copper sleeve; the stirring part is fixed in the cavity of the frame baffle, and the stirring part and the crystallizer ramming material are rammed and sintered to form a whole; the stirring part comprises a traveling wave magnetic field generator and an integrally formed stainless steel shell, the magnetic pole of the traveling wave magnetic field generator is arranged in a multi-stage straight line according to a width of 650 to 700 mm, the outer wall of the traveling wave magnetic field generator is closed by the stainless steel shell, and the cavity between the traveling wave magnetic field generator and the stainless steel shell is used to pass cooling water.

[0018] This solution sets the magnetic field generator at the above position, which can avoid major changes to the horizontal continuous casting crystallizer due to the introduction of the magnetic field generator, thereby making the magnetic field generator and the horizontal continuous casting crystallizer integrated, simpler and easier to install. The magnetic field generator is fixed under the frame baffle, and is rammed and sintered together with the ramming material to increase the firmness of the crystallizer and the immovability of the magnetic field generator, and ensure that the magnetic field generator and the holding furnace are isolated at a safe distance due to refractory materials, further reducing safety hazards. The magnetic field generator is placed on the upper side of the graphite plate and isolated by refractory materials, which can greatly reduce the impact of the magnetic field generator on the melt flow field and temperature field at the crystallization front due to cooling during operation. The magnetic field generator can ensure that the stirring force is evenly distributed across the entire cross section, and uniform forced stirring can be obtained.

[0019] The magnetic field generator adopts a multi-level linear arrangement, which is mainly optimized for the linear arrangement of the wider horizontal continuous casting strip, so that the magnetic field intensity distribution in the melt zone at the front of the crystallization is more uniform, so that the flow field and temperature field of the tin-phosphor bronze melt are more uniform during electromagnetic stirring, and the temperature distribution of the entire cross section is uniform and controllable. At the same time, the magnetic field generator is enclosed with an integrally formed stainless steel shell, which can reduce the welding area, thereby reducing the probability of safety hazards due to damage during use, making the magnetic field generator safer and more reliable. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The drawings constituting a part of the present application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0021] Figure 1 It shows a schematic structural diagram of an electromagnetic horizontal continuous casting device for a high-tin and wide-width tin-phosphor bronze alloy strip provided by an embodiment of the present invention;

[0022] Figure 2 Shows Figure 1 A schematic diagram of the structure of the stirring part;

[0023] Figure 3 The upper surface of the strip produced by Example 1 of the solution of the present invention is shown;

[0024] Figure 4 The lower surface of the strip produced by Example 1 of the solution of the present invention is shown;

[0025] Figure 5 The upper surface of the strip produced by Comparative Example 1 of the present invention is shown;

[0026] Figure 6 The lower surface of the strip produced by Comparative Example 1 of the present invention is shown;

[0027] Figure 7 The density before and after is the embodiment 1 of the present invention and the comparative example 1;

[0028] Figure 8 This is the macroscopic morphology 1 of Example 1 of the present invention;

[0029] Fig. 9 This is the macroscopic morphology 2 of Example 1 of the present invention;

[0030] Fig.10 This is the macroscopic morphology 1 of Comparative Example 1 of the present invention;

[0031] Fig.11 This is the macroscopic morphology 2 of Comparative Example 1 of the present invention;

[0032] Fig.12 The homogenized annealed structure of Example 1 of the present invention;

[0033] Fig.13 This is the homogenized annealing structure of Comparative Example 1 of the present invention;

[0034] Fig.14 The distribution of tin elements in each layer of Example 1 of the present invention;

[0035] Fig.15 The tin element distribution of each layer in Comparative Example 1 of the present invention is shown in FIG.

[0036] The above drawings include the following reference numerals:

[0037] 10. Insulating furnace for horizontal continuous casting furnace group; 20. Crystallizer; 21. Graphite plate; 22. Water-cooled copper sleeve; 23. Steel sleeve; 24. Frame baffle; 30. Stirring section; 31. Traveling wave magnetic field generator; 32. Stainless steel casing; 40. AC power supply; 50. Traction plate. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0039] like Figure 1 to Figure 2As shown, the present invention provides an electromagnetic horizontal continuous casting device for high-tin wide-width tin-phosphor bronze alloy strip, comprising a horizontal continuous casting furnace group insulation furnace 10, a crystallizer 20, a stirring part 30 and an AC power supply 40, wherein the crystallizer 20 is arranged at the furnace mouth of the horizontal continuous casting furnace group insulation furnace 10, the crystallizer 20 comprises a graphite plate 21, a water-cooled copper sleeve 22, a steel sleeve 23 and a frame baffle 24, the water-cooled copper sleeve 22 is arranged around the graphite plate 21, the steel sleeve 23 is arranged around the water-cooled copper sleeve 22, and the frame baffle 24 is located at the horizontal continuous casting furnace group insulation furnace 10. 0 and the water-cooled copper sleeve 22; the stirring part 30 is fixed in the cavity of the frame baffle 24, and the stirring part 30 and the crystallizer 20 are rammed and sintered to form a whole; the stirring part 30 includes a traveling wave magnetic field generator 31 and an integrally formed stainless steel shell 32, the magnetic level of the traveling wave magnetic field generator 31 is arranged in a multi-stage straight line according to a width of 650 to 700 mm, the outer wall of the traveling wave magnetic field generator 31 is closed by the stainless steel shell 32, and the cavity between the traveling wave magnetic field generator 31 and the stainless steel shell 32 is used to pass cooling water.

[0040] This solution sets the traveling wave magnetic field generator 31 at the above-mentioned position, which can avoid major changes to the horizontal continuous casting crystallizer 20 caused by the introduction of the traveling wave magnetic field generator 31, so that the traveling wave magnetic field generator 31 and the horizontal continuous casting crystallizer 20 are integrated, which is simpler and easier to install. The traveling wave magnetic field generator 31 is fixed under the frame baffle 24, and is rammed and sintered together with the ramming material to increase the firmness of the crystallizer 20 and the immovability of the traveling wave magnetic field generator 31, and ensure that the traveling wave magnetic field generator 31 and the holding furnace are isolated at a safe distance due to refractory materials, further reducing safety hazards. The traveling wave magnetic field generator 31 is placed on the upper side of the graphite plate 21 and isolated by refractory materials, which can greatly reduce the influence of the traveling wave magnetic field generator 31 on the melt flow field and temperature field at the crystallization front due to cooling during operation. The traveling wave magnetic field generator 31 can ensure that the stirring force is evenly distributed on the entire cross section, and uniform forced stirring can be obtained.

[0041] In addition, the traveling wave magnetic field generator 31 adopts a multi-level linear arrangement, mainly for the linear optimization arrangement of the wider horizontal continuous casting strip, so that the magnetic field intensity distribution in the melt zone at the front of the crystallization is more uniform, so that the flow field and temperature field of the tin-phosphor bronze melt are more uniform during electromagnetic stirring, and the temperature distribution of the entire cross section is uniform and controllable. At the same time, the traveling wave magnetic field generator 31 is enclosed by an integrally formed stainless steel shell 32, which can reduce the welding area, thereby reducing the probability of safety hazards due to damage during use, so that the traveling wave magnetic field generator 31 is safer and more reliable.

[0042] In this embodiment, the Shore hardness of the graphite plate 21 is 43-50 HSD and the density is 1.9-2.2 g / cm 3, the thermal conductivity is 400-420 W / m·K, and the degree of fit between the matching surfaces of the graphite plate 21 and the water-cooled copper sleeve 22 is ≥95%. The degree of fit can also be understood as the ratio of the contact area of ​​the matching surface to the total area of ​​the matching surface.

[0043] The presence of the traveling wave magnetic field generator 31 will have a certain impact on the existing material graphite plate 21. By controlling the density, hardness, thermal conductivity, and expansion coefficient of the graphite plate 21, the probability of cracking and oxidation of the graphite plate 21 can be reduced. If the hardness of the graphite plate 21 is too high, the surface quality of the ingot is relatively poor. If the expansion coefficient is too high, the probability of cracking of the graphite plate 21 due to thermal expansion and contraction increases. At the same time, the fit between the graphite plate 21 and the water-cooled copper sleeve 22 is limited. The better the fit, the more uniform the cooling effect of the graphite plate 21, and the smaller the probability of cracking.

[0044] In this solution, the current delivered by the AC power source 40 to the traveling wave magnetic field generator 31 is 380V three-phase AC, and the phase and direction change cycle of the three-phase AC is 3.5s.

[0045] In this solution, the width of the high-tin wide-width tin-phosphor bronze alloy strip is 650-700 mm, and the thickness is 15-17 mm. The mass percentage composition of the high-tin wide-width tin-phosphor bronze alloy strip is: Sn content 8.0-11.0wt%, P content 0.01-0.10wt%, Zn content ≤0.2wt%, Fe content ≤0.1wt%, and the rest is Cu and impurity elements.

[0046] Furthermore, the distance L1 between the stirring part 30 and the insulation furnace 10 of the horizontal continuous casting furnace group is 40-50 mm, and the distance L2 between the stirring part 30 and the center line of the graphite plate 21 is 50-70 mm. Within the above range of L2, the magnetic field generated by the magnetic field generator is more evenly distributed, and the magnetic field strength is just enough to break the solidified dendrites at the crystallization front of the graphite plate 21 and remelt them into the copper alloy melt, forming more nucleation cores, and the flow field and temperature distribution are more uniform; while if the distance is too large, the magnetic field strength attenuation is too large, the magnetic field distribution is uneven, and the stirring effect is affected; if the distance is too small, it interferes with the cooling effect of the graphite plate 21, and there are safety hazards. At the same time, the overall magnetic field strength is unevenly distributed and too large, which worsens the uniformity of the flow field and temperature field, resulting in cracking of the edge of the ingot. When L1 is within the above range, the copper alloy melt below the stirring section 30 is just in the crystallization front area, which can break up the solidified dendrites and remelt them into the copper alloy melt to form more non-heterogeneous nucleation cores, and in this distance range, the impact on the length of the graphite plate 21 is minimal, and sufficient safety is maintained; if L1 is too large, the length of the graphite plate 21 will be too long, the billet drawing will be difficult, and the crystallization front will move backward, causing solidification to move backward, making it impossible for electromagnetic stirring to break up the dendrites; if L1 is too small, there is not enough safety distance, and the furnace heat radiation will easily affect the cooling of the stirring section 30, which will increase the cooling intensity of the stirring section 30, thereby affecting the cooling effect and crystallization front position of the graphite plate 21.

[0047] The present invention also provides a continuous casting method, which is applied to the above-mentioned electromagnetic horizontal continuous casting device for high-tin wide-width tin-phosphor bronze alloy strip billets. The continuous casting method includes: when the melt temperature in the insulation furnace 10 of the horizontal continuous casting furnace group reaches the set temperature, starting the horizontal continuous casting traction machine, the horizontal continuous casting traction machine drives the traction plate 50 to move, and the traction plate 50 is cast at a set speed; after the initial casting is stable, starting the AC power supply 40 to make the traveling wave magnetic field generator 31 work, the operating frequency of the traveling wave magnetic field generator 31 is 5~50HZ, the current intensity is 5~30A, the Lorentz force exerted on the melt by the traveling wave magnetic field generator 31 is 10~50Gs, and the melt located at the crystallization front of the graphite plate 21 is forced to be stirred under the action of the Lorentz force to break the dendrites.

[0048] Among them, the set temperature is 1160-1190°C, and the set speed is 150-180 mm / min.

[0049] Furthermore, the continuous casting method adopts a pull-stop-withdraw-pull process, wherein the pulling speed is 15 to 25 mm / s, the pause time is 1 to 3S, and the withdrawing speed is 8 to 10 mm / s.

[0050] Furthermore, the strip produced by the continuous casting method is a high-tin wide-width tin-phosphor bronze alloy strip, the outlet temperature of the high-tin wide-width tin-phosphor bronze alloy strip center is 350°C to 380°C, and the lateral temperature difference of the entire strip is 20°C to 50°C.

[0051] In this scheme, since the horizontal continuous casting is drawing a wide, high-tin tin-phosphorus bronze horizontal continuous casting strip, the wide width will further increase the width-to-thickness ratio of the strip, thereby making the melt flow field and temperature field more unevenly distributed, and the high tin further aggravates the segregation of the tin element; the steel sleeve in the crystallizer is not rigid enough, and the longer the graphite plate, the greater the possibility of cracking. Therefore, it is necessary to carry out coordinated design and coordinated control in terms of the overall design of the electromagnetic generator, the installation position of the electromagnetic generator, the electromagnetic process parameters, the material and length of the graphite plate 21, and the fit between the graphite plate 21 and the water-cooled copper sleeve 22, so as to solve the problems caused by the wide, high-tin tin-phosphorus bronze horizontal continuous casting strip.

[0052] Combined with an effective casting process, the crystal line of the entire cross section of the wide high-tin tin phosphor bronze is straight and evenly distributed, achieving the purpose of uniform composition and temperature, so that the temperature deviation on the entire cross section is controlled within 50°C, and the crystallization temperature of the entire billet outlet is controlled within a higher temperature range, thereby reducing the difficulty of casting, increasing the solid solution amount of tin elements, and reducing the segregation of tin elements. Further, a wide high-tin tin phosphor bronze alloy strip with fine grains, small segregation, high density and excellent surface quality is obtained.

[0053] The outstanding substantive features and remarkable progress of the technical solution of the present invention are mainly reflected in:

[0054] 1. The present invention designs a multi-stage arrangement of traveling wave magnetic field generators 31 and an optimized installation of the traveling wave magnetic field generator 31 according to the wide width characteristics of the horizontal continuous casting strip, so that the magnetic field strength at the crystallization front tends to be evenly distributed, and the flow field and temperature field formed during forced stirring are more uniform, and turbulence does not occur, so that a large number of broken crystal nuclei are formed in the solidification zone at the crystallization front, thereby forming uniform and fine equiaxed crystals, and the interface is eliminated, the reverse segregation and microsegregation are suppressed, and the quality of the casting is improved;

[0055] 2. The present invention takes into account the stirring part 30, the frame baffle 24 of the crystallizer 20, the graphite plate 21, the water-cooled copper sleeve 22 and the steel sleeve 23 in a coordinated manner, thereby making the installation of the electromagnetic casting device more convenient, the operation safer, and the service life longer, and further improving the casting life of the graphite plate 21 and reducing the cracking probability of the graphite plate 21, thereby solving the problems caused by the wide-width high-tin tin-phosphor bronze horizontal continuous casting strip.

[0056] In order to explain the present solution more clearly, a specific embodiment of the present solution is described below.

[0057] Example 1 (reference Figures 3 to 15 ):

[0058] The multi-stage linear arrangement traveling wave magnetic field generator 31 is placed in the frame baffle 24 and fixed. The traveling wave magnetic field generator 31 is installed on the upper side of the graphite plate 21 and the left side of the water-cooled copper sleeve 22 and the steel sleeve 23, and is rammed and sintered by the crystallizer ramming material to form a whole with the crystallizer 20. The Shore hardness of the graphite plate is 48HSD and the density is 2.1g / cm 3 , thermal conductivity is 420W / (m·K), and the degree of adhesion between the graphite plate and the water-cooled copper sleeve is 96%. The integral crystallizer is installed on the insulation furnace 10 of the horizontal continuous casting furnace group. When the temperature of the tin-phosphor bronze melt with a tin content of 8.2% reaches 1190°C, the horizontal continuous casting traction machine is started to drive the traction plate 50 to move. The casting speed is 170mm / min, including a pulling speed of 20mm / s, a pause time of 2s, and a retraction speed of 9mm / s. After the casting is stable, the AC power supply 40 is started, and the traveling wave magnetic field generator 31 starts to work. The working frequency is 20HZ, the current intensity is 30A, and the traveling wave magnetic field generator acts on The Lorentz force of the tin-bronze melt is 40Gs. Under the action of the Lorentz force, the tin-phosphorus bronze alloy melt at the crystallization front of the graphite plate is forced to be stirred, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the flow field and temperature field in the lateral direction are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality. The temperature of the outlet at the center of the strip is 350°C, and the lateral temperature difference of the entire strip is 35°C.

[0059] Embodiment 2:

[0060] The multi-stage linear arrangement traveling wave magnetic field generator 31 is placed in the frame baffle 24 and fixed. The traveling wave magnetic field generator 31 is installed on the upper side of the graphite plate 21 and the left side of the water-cooled copper sleeve 22 and the steel sleeve 23, and is rammed and sintered by the crystallizer ramming material to form a whole with the crystallizer 20. The graphite plate has a Shore hardness of 43HSD and a density of 1.9g / cm 3, thermal conductivity is 400W / (m·K), and the degree of adhesion between the graphite plate and the water-cooled copper sleeve is 95%. The integral crystallizer is installed on the insulation furnace 10 of the horizontal continuous casting furnace group. When the temperature of the tin-phosphor bronze melt with a tin content of 8% is 1190°C, the horizontal continuous casting traction machine is started to drive the traction plate 50 to move. The casting speed is 150mm / min, of which the pulling speed is 15mm / s, the pause time is 2s, and the withdrawal speed is 8mm / s. After the casting is stable, the AC power supply 40 is started, and the traveling wave magnetic field generator 31 starts to work. The working frequency is 20HZ, the current intensity is 30A, and the traveling wave magnetic field generator acts on the tin-phosphor bronze. The Lorentz force of the copper melt is 30Gs. Under the action of the Lorentz force, the tin-phosphorus bronze alloy melt at the crystallization front of the graphite plate is forced to be stirred, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the flow field and temperature field in the lateral direction are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality. The temperature of the outlet at the center of the strip is 350°C, and the lateral temperature difference of the entire strip is 40°C.

[0061] Embodiment 3:

[0062] The multi-stage linear arrangement traveling wave magnetic field generator 31 is placed in the frame baffle 24 and fixed. The traveling wave magnetic field generator 31 is installed on the upper side of the graphite plate 21 and the left side of the water-cooled copper sleeve 22 and the steel sleeve 23, and is rammed and sintered by the crystallizer ramming material to form a whole with the crystallizer 20. The Shore hardness of the graphite plate is 50HSD and the density is 2.2g / cm 3 , thermal conductivity is 420W / (m·K), and the degree of adhesion between the graphite plate and the water-cooled copper sleeve is 98%. The integral crystallizer is installed on the insulation furnace 10 of the horizontal continuous casting furnace group. When the temperature of the tin phosphor bronze melt with a tin content of 10% is 1170°C, the horizontal continuous casting traction machine is started to drive the traction plate 50 to move. The casting speed is 170mm / min, of which the pulling speed is 20mm / s, the pause time is 1s, and the withdrawal speed is 9mm / s. After the casting is stable, the AC power supply 40 is started, and the traveling wave magnetic field generator 31 starts to work. The working frequency is 50HZ, the current intensity is 20A, and the traveling wave magnetic field generator acts on the tin The Lorentz force of the bronze melt is 40Gs. Under the action of the Lorentz force, the tin-phosphorus bronze alloy melt at the crystallization front of the graphite plate is forced to be stirred, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the lateral flow field and temperature field are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality. The temperature of the outlet at the center of the strip is 380°C, and the lateral temperature difference of the entire strip is 30°C.

[0063] Embodiment 4:

[0064] The multi-stage linear arrangement traveling wave magnetic field generator 31 is placed in the frame baffle 24 and fixed. The traveling wave magnetic field generator 31 is installed on the upper side of the graphite plate 21 and the left side of the water-cooled copper sleeve 22 and the steel sleeve 23, and is rammed and sintered by the crystallizer ramming material to form a whole with the crystallizer 20. The Shore hardness of the graphite plate is 45HSD and the density is 2.0g / cm 3 , thermal conductivity is 415W / (m·K), and the degree of adhesion between the graphite plate and the water-cooled copper sleeve is 96%. The integral crystallizer is installed on the insulation furnace 10 of the horizontal continuous casting furnace group. When the temperature of the tin phosphor bronze melt with a tin content of 8% is 1190°C, the horizontal continuous casting traction machine is started to drive the traction plate 50 to move. The casting speed is 180mm / min, of which the pulling speed is 25mm / s, the pause time is 3s, and the withdrawal speed is 10mm / s. After the casting is stable, the AC power supply 40 is started, and the traveling wave magnetic field generator 31 starts to work. The working frequency is 50HZ, the current intensity is 30A, and the traveling wave magnetic field generator acts on the tin The Lorentz force of the bronze melt is 20Gs. Under the action of the Lorentz force, the tin-phosphorus bronze alloy melt at the crystallization front of the graphite plate is forced to be stirred, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the flow field and temperature field in the lateral direction are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality. The temperature of the outlet at the center of the strip is 350°C, and the lateral temperature difference of the entire strip is 50°C.

[0065] Embodiment 5:

[0066] The multi-stage linear arrangement traveling wave magnetic field generator 31 is placed in the frame baffle 24 and fixed. The traveling wave magnetic field generator 31 is installed on the upper side of the graphite plate 21 and the left side of the water-cooled copper sleeve 22 and the steel sleeve 23, and is rammed and sintered by the crystallizer ramming material to form a whole with the crystallizer 20. The graphite plate has a Shore hardness of 43HSD and a density of 1.9g / cm 3, thermal conductivity is 400W / (m·K), and the degree of adhesion between the graphite plate and the water-cooled copper sleeve is 97%. The integral crystallizer is installed on the insulation furnace 10 of the horizontal continuous casting furnace group. When the temperature of the tin-phosphor bronze melt with a tin content of 9% is 1180°C, the horizontal continuous casting traction machine is started to drive the traction plate 50 to move. The casting speed is 160mm / min, of which the pulling speed is 18mm / s, the pause time is 2s, and the withdrawal speed is 10mm / s. After the casting is stable, the AC power supply 40 is started, and the traveling wave magnetic field generator 31 starts to work. The working frequency is 50HZ, the current intensity is 5A, and the traveling wave magnetic field generator acts on the tin-phosphor bronze. The Lorentz force of the copper melt is 20Gs. Under the action of the Lorentz force, the tin-phosphorus bronze alloy solution at the crystallization front of the graphite plate is forced to be stirred, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the flow field and temperature field in the lateral direction are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality. The temperature of the outlet at the center of the strip is 380°C, and the lateral temperature difference of the entire strip is 20°C.

[0067] Embodiment 6:

[0068] The multi-stage linear arrangement traveling wave magnetic field generator 31 is placed in the frame baffle 24 and fixed. The traveling wave magnetic field generator 31 is installed on the upper side of the graphite plate 21 and the left side of the water-cooled copper sleeve 22 and the steel sleeve 23, and is rammed and sintered by the crystallizer ramming material to form a whole with the crystallizer 20. The Shore hardness of the graphite plate is 46HSD and the density is 2.05g / cm 3 , thermal conductivity is 410W / (m·K), and the degree of adhesion between the graphite plate and the water-cooled copper sleeve is 98%. The integral crystallizer is installed on the insulation furnace 10 of the horizontal continuous casting furnace group. When the temperature of the tin phosphor bronze melt with a tin content of 11% is 1160°C, the horizontal continuous casting traction machine is started to drive the traction plate 50 to move. The casting speed is 165mm / min, of which the pulling speed is 20mm / s, the pause time is 3s, and the withdrawal speed is 10mm / s. After the casting is stable, the AC power supply 40 is started, and the traveling wave magnetic field generator 31 starts to work. The working frequency is 30HZ, the current intensity is 30A, and the traveling wave magnetic field generator acts on the tin The Lorentz force of the bronze melt is 50Gs. Under the action of the Lorentz force, the tin-phosphorus bronze alloy melt at the crystallization front of the graphite plate is forced to be stirred, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the flow field and temperature field in the lateral direction are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality. The temperature of the outlet at the center of the strip is 360°C, and the lateral temperature difference of the entire strip is 40°C.

[0069] Comparative Example 1 (refer to Figures 3 to 15 ):

[0070] The difference between Comparative Example 1 and Example 1 is that no electromagnetic field is applied in Comparative Example 1, and a cross section of the entire strip of tin-phosphor bronze in Example 1 and Comparative Example 1 is selected to observe its solidification structure, density, element segregation and homogenization annealing structure.

[0071] Test method:

[0072] Microstructure investigation: Zeiss Axio Imager 2 optical microscope;

[0073] Density: Ray-Ran EXPLORER PRO density balance;

[0074] Macroscopic tissue observation: Olympus SZX10 stereo microscope;

[0075] Organization analysis: homogenized organization test, using scanning electron microscope EBSD for analysis;

[0076] Elemental analysis: The American thermoelectric direct reading spectrometer analyzes tin phosphor bronze layer by layer.

[0077] From the above results and comparisons, it can be concluded that by adopting this scheme, the tin-phosphorus bronze alloy melt at the crystallization front of the graphite plate is forcibly stirred under the action of the Lorentz force, and the solidified dendrites at the crystallization front are broken and remelted into the melt to form more nucleation cores, so that the lateral flow field and temperature field are more uniform, and straight crystallization lines with equal spacing are obtained, thereby obtaining a high-tin wide-width tin-phosphorus bronze strip with uniform and fine grain structure, small segregation, high density and excellent casting quality, thereby improving the problems of coarse grain structure and aggravated segregation caused by uneven melt flow field and temperature field when the width and high tin are wide, and further improving the oxidation and cracking problems of the overall graphite plate, and increasing the service life of the graphite plate.

[0078] In summary, the above comparison illustrates that the embodiment of the present invention applies a magnetic field in a wide-width high-tin electromagnetic casting device, thereby refining the casting structure of the ingot and the subsequent homogenization structure, inhibiting the reverse segregation and microsegregation of the tin element, improving the density of the ingot, and improving the casting quality of the tin-phosphorus bronze ingot, thereby solving the problem of preparing wide-width high-tin tin-phosphorus bronze alloy strip ingots.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An electromagnetic horizontal continuous casting device for high-tin and wide-width tin-phosphor bronze alloy strip, characterized in that: It comprises a horizontal continuous casting furnace group holding furnace (10), a crystallizer (20), a stirring part (30) and an AC power supply (40), wherein: The crystallizer (20) is arranged at the furnace mouth of the horizontal continuous casting furnace group insulation furnace (10), the crystallizer (20) comprises a graphite plate (21), a water-cooled copper sleeve (22), a steel sleeve (23) and a frame baffle (24), the water-cooled copper sleeve (22) is arranged around the graphite plate (21), the steel sleeve (23) is arranged around the water-cooled copper sleeve (22), and the frame baffle (24) is located between the horizontal continuous casting furnace group insulation furnace (10) and the water-cooled copper sleeve (22); The stirring portion (30) is fixed in the cavity of the frame baffle (24), and the stirring portion (30) and the crystallizer (20) ramming material are rammed and sintered to form a whole; the stirring portion (30) comprises a traveling wave magnetic field generator (31) and an integrally formed stainless steel shell (32), the magnetic poles of the traveling wave magnetic field generator (31) are arranged in a multi-stage linear manner according to a width of 650-700 mm, the outer wall of the traveling wave magnetic field generator (31) is closed by the stainless steel shell (32), and the cavity between the traveling wave magnetic field generator (31) and the stainless steel shell (32) is used to pass cooling water; The graphite plate (21) has a Shore hardness of 43-50 HSD and a density of 1.9-2.2 g / cm 3 , the thermal conductivity is 400-420 W / (m·K), and the degree of fit between the matching surfaces of the graphite plate (21) and the water-cooled copper sleeve (22) is ≥95%; A distance L1 between the stirring portion (30) and the horizontal continuous casting furnace group insulation furnace (10) is 40-50 mm, and a distance L2 between the stirring portion (30) and the center line of the graphite plate (21) is 50-70 mm.

2. The electromagnetic horizontal continuous casting device for high-tin and wide-width tin-phosphor bronze alloy strip according to claim 1 is characterized in that: The current delivered by the AC power source (40) to the traveling wave magnetic field generator (31) is 380V three-phase AC, and the phase and direction change cycle of the three-phase AC is 3.5s.

3. The electromagnetic horizontal continuous casting device for high-tin and wide-width tin-phosphor bronze alloy strip according to claim 1 is characterized in that: The high-tin wide-width tin-phosphor bronze alloy strip has a width of 650-700 mm and a thickness of 15 mm-17 mm.

4. The electromagnetic horizontal continuous casting device for high-tin and wide-width tin-phosphor bronze alloy strip according to claim 1 is characterized in that: The mass percentage composition of the high-tin wide-width tin-phosphor bronze alloy strip is as follows: Sn content 8.0-11.0 wt%, P content 0.01-0.10 wt%, Zn content ≤0.2 wt%, Fe content ≤0.1 wt%, and the rest is Cu and impurity elements.

5. A continuous casting method, characterized in that: The continuous casting method is applied to the electromagnetic horizontal continuous casting device for high-tin wide-width tin-phosphor bronze alloy strips according to any one of claims 1 to 4, and the continuous casting method comprises: When the temperature of the melt in the insulation furnace (10) of the horizontal continuous casting furnace group reaches a set temperature, starting a horizontal continuous casting traction machine, the horizontal continuous casting traction machine drives the traction plate (50) to move, and the traction plate (50) performs casting at a set speed; After the initial casting is stabilized, the AC power supply (40) is started to operate the traveling wave magnetic field generator (31), wherein the operating frequency of the traveling wave magnetic field generator (31) is 5-50 Hz and the current intensity is 5-30 A. The Lorentz force exerted on the melt by the traveling wave magnetic field generator (31) is 10-50 Gs. The melt at the crystallization front of the graphite plate (21) is forcibly stirred under the action of the Lorentz force to break the dendrites.

6. The continuous casting method according to claim 5, characterized in that: The set temperature is 1160-1190° C., and the set speed is 150-180 mm / min.

7. The continuous casting method according to claim 5, characterized in that: The continuous casting method adopts a pull-stop-withdraw-pull process, wherein the pulling speed is 15-25 mm / s, the pause time is 1-3 s, and the withdrawing speed is 8-10 mm / s.

8. The continuous casting method according to claim 5, characterized in that: The strip produced by the continuous casting method is a high-tin wide-width tin-phosphor bronze alloy strip, the outlet temperature of the high-tin wide-width tin-phosphor bronze alloy strip center is 350°C-380°C, and the lateral temperature difference of the entire strip is 20°C-50°C.

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