A titanium alloy profile continuous rolling production process line

Abstract

The application discloses a titanium alloy profile continuous rolling production process line, which sequentially comprises a heating device, a plurality of successive deformation rolling devices and a forming rolling device. Each rolling roller set is provided with an upper rolling roller and a lower rolling roller, and corresponding rolling rectangular grooves are formed on the surfaces of the upper rolling roller and the lower rolling roller. Heating devices are arranged between adjacent rolling roller sets and between the rolling roller sets and the forming rolling device. The continuous rolling production process line can solve the limitation of titanium rod rolling length, realize continuous rolling of the titanium rod, thereby meeting the demand for long-sized profile, reducing end waste and lowering processing cost. Meanwhile, in the continuous rolling process, the problem of temperature drop can be solved, the forming quality of the flat strip profile is improved, the defect rate is lowered, and the safety hidden danger existing in the current manual reciprocating rolling operation is solved. The application further improves the coiling quality when coiling, and avoids the problem of insufficient profile length caused by the fracture of the flat strip profile when coiling.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of flat strip profile forming, and particularly relates to a titanium alloy profile continuous rolling production process line. BACKGROUND

[0002] The profile is a strip-shaped component formed by plastic processing of metal and having a certain cross-sectional shape and size. The profile has various specifications and is widely used. The profile is an object having a certain geometry formed by rolling, extrusion, casting and other processes. Such material has a certain appearance size, a certain cross-sectional shape, and certain mechanical and physical properties. The profile can be used alone or further processed into other manufactured products and is commonly used in building structures and manufacturing and installation.

[0003] Titanium alloy is widely used as a profile due to its excellent characteristics such as light weight and corrosion resistance. For example, the titanium alloy mobile phone frame is usually formed by successively rolling titanium alloy bars of a certain length into titanium alloy flat strips before being further processed into a mobile phone frame product.

[0004] The current process for processing titanium alloy flat strip profiles is as follows: short titanium alloy bars are heated to the required rolling temperature in a heating furnace, and then taken out and successively rolled on multiple rolling roller groups. The multiple rolling roller groups are used to reduce the diameter of the titanium bar to the size of the flat strip profile (usually the size of the titanium bar is larger than that of the profile so that the rolling deformation can be realized and the flat strip profile can be successively formed). Titanium alloy has a rapid temperature drop defect. When it is rolled, it needs to be successively and continuously passed through multiple rollers with different diameters to continuously realize the diameter reduction rolling of the titanium bar. The rolling equipment structure is shown in the accompanying drawings of the specification. The titanium bar is repeatedly shuttled between similar rollers to realize rolling. Therefore, in order to facilitate the shuttling operation of the titanium bar, the titanium bar to be rolled is usually short titanium bars with a small length (the length of the titanium bar increases after diameter reduction rolling). Figure 1-2

[0005] In the rolling process steps, the first step is to take out the heated short titanium bar from the heating furnace for rolling. During the transfer of the titanium bar from the heating furnace to the rolling roller, there is a transfer process, which causes the first temperature drop of the titanium bar. In the subsequent reciprocating rolling process, there is still a continuous temperature drop. The reciprocating transfer cycle of the titanium bar operated by artificial operation is long (the transfer time is lengthened to ensure safety during operation when the titanium bar is in a high-temperature state). The temperature drop of the titanium bar is larger, and the temperature of the titanium bar is further reduced to an unsuitable temperature range for rolling deformation. Continuing to roll will cause deformation of the internal organization (crystal) of the titanium bar, resulting in internal defects and surface cracks of the titanium bar.

[0006] ​In order to overcome the problem of temperature drop, the titanium bar is usually heated to a temperature higher than the optimum rolling temperature range at present, so as to overcome the temperature drop caused by the transfer of the titanium bar and the rolling, so that the temperature drop in the later stage of rolling does not decrease to an unsuitable rolling temperature. However, the titanium bar is heated to a temperature higher than the optimum rolling temperature during heating, which also causes problems of internal organization and surface defects of the titanium bar.

[0007] Therefore, in the process of forming the titanium bar into a flat strip profile, the rolling temperature drop of the titanium bar affects the forming quality of the flat strip profile, and in order to overcome the problem of temperature drop and speed up the processing efficiency, the length and weight of the rolled titanium bar are limited, and long-size profile processing cannot be realized, and a large amount of end waste is also generated, increasing the production cost. SUMMARY

[0008] In view of the above problems, the present application aims to provide a titanium alloy profile continuous rolling production process line, which solves the problem of temperature drop of the titanium alloy rolled profile at present, and at the same time improves the length of the flat profile forming, and also effectively protects the profile after forming.

[0009] In order to achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows: a titanium alloy profile continuous rolling production process line, the titanium alloy profile is a flat strip structure, characterized in that the production process line comprises in sequence:

[0010] A heating device for heating the continuous rolling blank passing through to a rolling temperature;

[0011] A multi-pass gradual deformation rolling device for gradually reducing the diameter of the heated rolling blank to an intermediate blank;

[0012] A forming rolling device for rolling the intermediate blank into a profile design structure forming piece.

[0013] Further, the multi-pass gradual deformation rolling device is a rolling roller group arranged at intervals, and the rolling gap of adjacent rolling roller groups gradually decreases.

[0014] Further, each rolling roller group has an upper roller and a lower roller, and corresponding rolling rectangular grooves are formed on the surfaces of the upper roller and the lower roller.

[0015] Further, the heating device is arranged between adjacent rolling roller groups and between the rolling roller group and the forming rolling device.

[0016] Further, the forming rolling device comprises vertical rollers and horizontal rollers symmetrically arranged on the side edges of the titanium alloy profile, and the rolling surfaces of the vertical rollers and the horizontal rollers are both flat structures.

[0017] Further, a forming rectangular groove embedded with the side end of the titanium alloy profiled bar is formed on the rolling surface of the horizontal roller.

[0018] Further, a winding reel with a winding core is arranged at the rear side of the forming rolling device, and an elastic pressure roller is arranged on the winding reel and pressed on the winding core.

[0019] Further, a straightening roller set is arranged at the front side of the heating device.

[0020] The continuous rolling production process line disclosed in the application can solve the limitation of the rolling length of the titanium bar, realize the continuous rolling of the titanium bar, and thus obtain the demand for long-sized profiled bars and reduce the end waste and the processing cost. Meanwhile, the problem of temperature drop can be solved in the continuous rolling process, the forming quality of the flat strip profiled bar is improved, the defect rate is reduced, and the safety hidden danger existing in the current manual reciprocating rolling operation is solved. In view of the relatively large flatness of the formed flat strip profiled bar, the winding quality is further improved when the flat strip profiled bar is wound, and the problem of insufficient length of the profiled bar caused by the fracture of the flat strip profiled bar when the flat strip profiled bar is wound is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is a top view schematic diagram of the current short root titanium bar rolling process.

[0022] Figure 2 It is a front view structural diagram of the multi-stage rolling roller set for the short root titanium bar rolling.

[0023] Figure 3 It is a structure diagram of the titanium bar winding of the application.

[0024] Figure 4 It is a whole structure diagram of the continuous rolling production process line of the application.

[0025] Figure 5 It is a deformation diagram of the multi-stage continuous rolling of the titanium bar to the intermediate blank of the application.

[0026] Figure 6 It is a structure diagram of a single rolling roller set of the application.

[0027] Figure 7 It is a deformation diagram of the rolling of the titanium bar by the rolling roller set of the application.

[0028] Figure 8 It is a deformation diagram of the constraint of the arc shape of the two sides of the titanium bar by the rolling roller set of the application.

[0029] Figure 9 It is a structure diagram of the forming rolling device of the application.

[0030] Figure 10 It is a structure diagram of the forming rolling device of the application. Figure 9 The structure at A in the middle is enlarged.

[0031] Figure 11 The structure diagram of the guide roller group of the present application is shown.

[0032] Figure 12 The structure diagram of the winding disc of the present application is shown.

[0033] Figure 13 The right spiral winding diagram of the flat strip profile of the present application is shown.

[0034] Figure 14 The left spiral winding diagram of the flat strip profile of the present application is shown.

[0035] Figure 15 The winding gap diagram of the flat strip profile of the present application is shown.

[0036] Figure 16 The winding gap diagram of the flat strip profile of the present application is shown.

[0037] Figure 17 The structure and effect diagram of the elastic pressure roller of the present application is shown.

[0038] Figure 18 The displacement diagram of the pressure roller of the present application is shown.

[0039] Figure 19 The effect diagram of the guide roller group of the present application is shown.

[0040] In the figure: 1 unwinding disc; 2 straightening roller group; 31 heating pipe; 32 heat preservation brick; 41 upper roller; 42 lower roller; 4a rolling rectangular groove; 51 vertical roller; 52 horizontal roller; 5a forming rectangular groove; 6 guide roller group; 7 sliding base; 8 winding disc; 81 winding core; 91 pressure roller; 92 U-shaped support; 93 pressure spring; 94 pressure support; 10a short titanium rod; 10b winding titanium rod; 20 multi-stage rolling roller group; 30 flat strip profile. DETAILED DESCRIPTION

[0041] In order to make the ordinary skilled in the art better understand the technical solutions of the present application, the technical solutions of the present application are further described below in combination with the drawings and examples.

[0042] Referring to the drawings Figures 1-19 A titanium alloy profile continuous rolling production process line is shown in the drawings, the titanium alloy profile is a flat strip structure, such as Figure 10The structure shown in the patent No. 30, the structure size is preferably as 2*8mm, which can be used as a structural member, a fastener and a titanium alloy frame of the recently launched iPhone 15 mobile phone and other application fields.

[0043] The present application is to solve the problems existing in the process of rolling the blank into the titanium alloy profile (flat strip structure), and a production process line is designed, which sequentially includes:

[0044] A heating device is arranged for heating the continuously passing continuous rolling blank to the rolling temperature. The continuous rolling blank is preferably a titanium alloy bar, which is a continuous length of reel structure. An uncoiling reel 1 is preferably arranged between the heating device, the continuous length of reel structure of the titanium alloy bar is placed on the uncoiling reel, the end of the reel bar is inserted into the heating device for heating, and the bar continuously travels under the driving of the rolling device behind the heating device, and drives the uncoiling reel to rotate, realizing the continuous uncoiling of the reel bar.

[0045] The heating device is preferably a high-frequency heating mode, which includes a heating pipe 31 for passing the titanium rod, and the outer periphery of the heating pipe is continuously wound with a high-frequency heating guide pipe (not shown in the figure), and the outer side of the heating pipe and the heating guide pipe is provided with heat preservation bricks 32.

[0046] The high-frequency heating pipe has a faster heating rate, which can ensure that the bar reaches the set heating temperature within the traveling time period of the bar in the heating device during the continuous traveling of the bar. Compared with the short bar heated to the rolling temperature in the heating furnace as shown in the prior art, Figure 1 The short bar in the heating furnace can solve the problem of heating loss (temperature drop) of the short bar during the process of taking out from the heating furnace. After the bar is heated by the high-frequency heating device, it can enter the subsequent multi-pass gradual deformation rolling device nearby for continuous and uninterrupted rolling deformation operation. Therefore, compared with the current heating and rolling operation mode, the present application can greatly solve the problem of large temperature drop of the bar during the transfer process after heating in the heating furnace. The present application can complete the rolling process of the required size of the blank before the blank is completely cooled. In the prior art, due to the heat loss caused by the transfer of the blank, the blank is lowered to a low temperature state before the rolling is completed, and when the rolling continues, the blank in the low temperature state is prone to surface cracks and internal organization defects, affecting the quality of the profile finished product.

[0047] And in order to solve the problem of completing the whole rolling operation before the temperature drops completely, it is necessary to overcome the influence of temperature drop during the transfer of the blank, so the current heating temperature of the blank is usually higher than the optimal rolling temperature range, so as to overcome the problem of too fast temperature drop during rolling. However, after heating the blank to a temperature higher than the optimal rolling temperature, the internal structure of the blank (crystal) will change, making the texture of the blank hard and the plasticity poor, affecting the secondary processing of the formed profile (easy to cause surface cracks and breakage of the profile). Therefore, the high-frequency heating method adopted by the present application greatly solves the problem of rolling temperature drop, and improves the forming defects (internal structure and surface cracks, etc.) caused by temperature mismatch during profile rolling. In addition, the present application also realizes continuous bar rolling operation, which can effectively reduce the waste cost of the end excess material of the formed profile.

[0048] After the above continuous heating of the bar, the multi-pass sequential deformation rolling device is used for continuous rolling operation. The multi-pass sequential deformation rolling device gradually reduces the diameter of the heated continuous rolling blank (the outer diameter of the titanium rod of the original blank is equal in the circumferential direction, and the structure of the formed flat strip is larger in surface width than in thickness, so the rolling process is a process of reducing the diameter of the blank). Figure 5 As shown in the figure, the round cross-section bar is sequentially rolled into a cross-section shape similar to the flat strip profile structure.

[0049] The forming rolling device rolls the intermediate blank into a profile design structure. Specifically, the intermediate blank with a similar flat strip structure after diameter reduction is formed into a flat strip profile with smooth surface and side edge.

[0050] Specifically, as shown in Figure 4 , 6 -7, the multi-pass sequential deformation rolling device is a rolling roller group arranged at intervals. The upper and lower surfaces of the titanium rod passing through the rolling roller group are extruded to realize diameter reduction. The rolling gap of adjacent rolling roller groups gradually decreases, so that the next rolling roller group continues to reduce the diameter based on the size after rolling of the previous rolling roller group, so as to approach the outer size of the flat strip profile.

[0051] As shown in Figure 6 , each rolling roller group has an upper roller 41 and a lower roller 42. When the bar passes through, the two rollers approach each other or the gap between the two rollers is adjusted in advance (the gap is smaller than the outer diameter of the titanium rod). When the plate passes through, the upper roller and the lower roller are extruded to realize the rolling and diameter reduction of the bar. As shown in Figure 5 , 7As shown, during the multi-pass rolling process of the rolling mill, after the upper and lower rolls squeeze the titanium rod, the vertical height of the titanium rod decreases, while under the squeezing action, the horizontal and transverse sides expand outwards. Figure 7 (As shown by the middle arrow), this causes the curvature on both sides to be greater than the original curvature of the bar. The side with this increased curvature then serves as the vertical sidewall of the flat bar, requiring a vertical planar structure. During multiple rolling processes, the curvature of this side will further increase (e.g., Figure 4 As shown in the diagram, the gradually convex sides present significant challenges during subsequent forming and rolling, including defects such as unevenness on the sides of the flat strip profile. Therefore, to avoid these difficulties in subsequent forming and rolling during the step-by-step rolling process, such as… Figure 8 As shown, corresponding rectangular rolling grooves 4a are formed on the surfaces of both the upper and lower rolls. Their function is as follows: Figure 8 As shown, when the upper and lower rolls extrude the titanium rod, the two side walls of the titanium rod are confined within the rolling rectangular groove surrounded by the upper and lower sides. The inner side wall of the rolling rectangular groove, in the direction of arrow a, restricts the side of the titanium rod from "protruding" outward, and then expands in the direction of arrow b. Gradually, the curvature of the side of the titanium rod during extrusion rolling is reduced, and it approaches deformation in the direction of the vertical side wall. Thus, after multi-stage diameter reduction rolling, the similarity between the shape of the intermediate billet and the flat strip profile can be further improved, and the difficulty of subsequent rolling is reduced, thereby improving the flatness of the side wall of the flat strip profile.

[0052] Although the continuous rolling production line provided in this application can continuously and rapidly complete multiple rolling and forming rolling processes between the temperature drop of the titanium bar and the temperature at which it is difficult to roll, the problem of temperature drop of the titanium bar still exists after it leaves the high-frequency heating and during the forming rolling process. Therefore, to avoid the influence of this temperature drop, heating devices (not shown in the figure) are installed between adjacent rolling roll groups and between the rolling roll groups and the forming rolling device. Thus, a temperature rise is immediately obtained after each rolling stress, ensuring a suitable rolling temperature for the next rolling pass and avoiding the generation of surface and internal defects in the flat material.

[0053] Specifically, such as Figure 9 As shown, the forming and rolling device includes vertical rolls 51 and horizontal rolls 52 symmetrically arranged to conform to the sides of the titanium alloy profile, and the rolling surfaces of both the vertical and horizontal rolls are planar structures. The vertical rolls and horizontal rolls contact the upper and lower surfaces and left and right sides of the intermediate billet, and under the action of the planar structures, the intermediate billet is shaped into a flat strip profile with a regular (flat) surface.

[0054] To further improve the accuracy of the two arc surfaces on the forming plane structure of the intermediate billet during the diameter reduction rolling process, such as Figure 10As shown, rectangular forming grooves 5a are formed on the rolling surface of the horizontal rolls, which are embedded in the side ends of the titanium alloy profile. The rectangular forming grooves embed the horizontal sides of the intermediate billet, and are the same as the rolling rectangular groove structure described above. This restricts the further "protrusion" of the side arc. At the same time, during the mutual extrusion of the two horizontal rolls, and under the structural limitation of the rectangular forming grooves, the two ends of the deformed intermediate billet are filled into the rectangular forming grooves. With the help of the regular internal structure of the rectangular forming grooves, the side wall structure of the flat strip profile with a smooth surface is formed.

[0055] When titanium bars undergo multi-stage reduction rolling, their overall size increases, leading to material "extrusion" problems between adjacent rolling roll groups and between the rolling roll groups and the forming rolling device. Therefore, the continuous rolling line of this application is also equipped with a control cabinet (not shown in the figure), which controls the rolling speed of each rolling roll group and the forming rolling device (the rolling rolls of the rolling roll group and the forming rolling device are all driven by individual motors, and the speed of each motor is controlled by the control cabinet to control the speed of the rolling rolls) to ensure that the titanium bars and the formed intermediate billets are rolled in a straight line throughout the entire rolling process.

[0056] Because the flat strip profile has a large flatness ratio after forming, and the continuous rolling line of this application is for continuous rolling, in order to facilitate the collection of the formed profile and avoid the problem of bending and breaking in any state, such as Figure 4 , 12 As shown, a reel 8 is also provided on the rear side of the forming and rolling device. The reel has a core 81. When the reel rotates, the continuously formed flat strip profile is wound onto the core of the reel to collect the formed profile.

[0057] like Figures 13-14 As shown, the process of the profile coiling on the core involves overlapping layers in both directions of a spiral coiling. During the coiling process, the profile needs to shift left and right along its axial direction on the core to achieve continuous spiral coiling. However, in actual operation, the profile cannot achieve regular left and right shifting on its own when it is unrestrained, which easily leads to staggered and chaotic layering, as well as discontinuous (close) coiling problems. Figures 15-16 As shown in the coiled state, the staggered stacking of layers will aggravate the wear on the profile surface, affecting the surface forming quality. On the other hand, continuous and tight coiling will cause excessive lateral swaying of the profile, which will lead to sway cracks and breakage on the profile surface. Figure 16 As shown at point c), to solve this problem, this application provides a pressure roller 91 that elastically presses against the core on the reel. The specific elastic pressing structure is as follows... Figures 17-18 As shown:

[0058] The structure includes a U-shaped bracket 92 mounted on the outer frame of the reel (not shown in the figure, used for the rotation of the reel away from the bottom surface), a pressure spring 93 located in the middle of the bottom surface of the U-shaped bracket, a pressure bracket 94 connected to the bottom of the pressure spring, and a pressure roller parallel to the core mounted on the pressure bracket. The function of this structure is to use the pressure spring to drive the pressure roller to press against the surface of a portion of the coiled profile, thereby limiting the height space of the subsequently coiled profile by the curvature of the coiled profile. This prevents the subsequent coiled profile from having a chaotic, overlapping coil, thus limiting the height space of the single-layer coiled profile within a limited coiling space. Figure 17 As shown at point d, a single-layer continuous coil is achieved within the coil, thereby avoiding the problems of wear from interlaced coiling and the unrestrained bending and breakage of the profile, ensuring the forming quality of the profile.

[0059] After one layer of winding is completed, when the profile is wound to the second layer, reverse compression overcomes the pressing action of the pressure spring, driving the pressure roller to move upward by the thickness of one layer of flat material. Figure 18 As shown in the figure, the second layer of flat material is then wrapped and pressed, and multiple layers of flat material are wrapped and pressed in sequence.

[0060] Since there is rolling friction due to the rolling contact between the pressure roller and the profile surface, in order to avoid the problem of the pressure roller deviating in the circumferential direction (profile winding direction) due to this rolling friction, the preferred pressing spring is a spring sleeve structure, which can further overcome the rolling friction when the profile is wound through the outer wall of the sleeve.

[0061] Further measures are needed to address the issue of profile cracking and breakage caused by restricting free sway during winding, such as... Figure 4 , 11 As shown, a guide roller assembly 6 is also provided between the coiling and forming rolling devices. A sliding base 7 is provided at the bottom of this guide roller assembly, and the guide roller assembly slides horizontally on the sliding base parallel to the coil. During guidance, the formed profile passes through the guide roller assembly, and as it winds onto the coil, it coils tightly from left to right or from right to left. The sliding resistance of the guide roller assembly on the sliding base and the weight of the guide roller assembly itself limit the free sway of the guide roller assembly. Figure 19 As shown, during the process of winding the profile from right to left, the guide roller group needs to overcome the leftward sliding (as shown by arrow e). In turn, the guide roller group reacts and drives the profile to the right (as shown by arrow f), so that it comes into close contact with the already wound profile. This effectively solves the problem of bending and breakage caused by free swaying during the winding of the profile.

[0062] In order to further improve the flatness of the titanium rod in the rolling process (the titanium rod in the flat state can improve the quality of the rolling deformation), a straightening roller group 2 is further arranged on the front side of the heating device. It is a multi-roller group structure. After the coiled titanium rod is unwound, the titanium rod is driven to be straightened to a straight state by the forward and reverse extrusion of the straightening roller group, so as to facilitate the deformation quality in the subsequent rolling process.

[0063] The principle of the present application is that the titanium rod in the coiled state is placed on the unwinding disc, the end of the coiled rod is inserted into the straightening roller group, the rod continuously advances under the straightening drive of the roller group, and the unwinding disc is driven to rotate, so as to realize continuous unwinding of the coiled rod.

[0064] The unwound rod is then heated in the heating pipe, enters the frontmost rolling roller group after heating for reducing diameter rolling, enters the rear heating pipe again after rolling for heating, and then enters the rear rolling roller group again for rolling. After completing the multi-pass reducing diameter rolling, it enters the forming rolling roller group for shape correction rolling, and the flat strip profile after shape correction passes through the guide roller group to the core of the coiling disc for multi-layer coiling, thereby realizing the continuous rolling and forming of the long coiled titanium rod into a flat strip profile by the continuous rolling line.

[0065] The basic principles, main features and advantages of the present application are shown and described above. The present application can also have various changes and improvements without departing from the spirit and scope of the present application, and these changes and improvements all fall within the scope of the present application.

Claims

1. A process line for the production of titanium alloy profiled sections by continuous rolling, the titanium alloy profiled sections being of a flat strip configuration, characterised in that, The production process line sequentially comprises: a heating device for heating the continuously passing continuous rolling blank to a rolling temperature; a multi-pass gradual deformation rolling device for gradually reducing the diameter of the heated continuous rolling blank to an intermediate blank; a forming rolling device for rolling the intermediate blank into a profiled member with a profiled design structure; the multi-pass gradual deformation rolling device is a plurality of rolling roller groups arranged at intervals, and the rolling gaps of adjacent rolling roller groups gradually decrease; the heating device is arranged between adjacent rolling roller groups and between a rolling roller group and the forming rolling device; the forming rolling device comprises vertical rollers and horizontal rollers symmetrically arranged on the side edges of the titanium alloy profiled member, and the rolling surfaces of the vertical rollers and the horizontal rollers are both planar structures; the vertical rollers and the horizontal rollers are in contact with the upper and lower surfaces and the left and right side edges of the intermediate blank; a profiled rectangular groove is formed on the rolling surface of the horizontal roller and embedded in the side end of the titanium alloy profiled member; the profiled rectangular groove embeds the horizontal two sides of the intermediate blank, and in the process of the two horizontal rollers being pressed towards each other and under the structure limitation of the profiled rectangular groove, the two ends of the intermediate blank in the deformed state are filled into the profiled rectangular groove; a reel is further arranged at the rear side of the forming rolling device, the reel has a reel core, and an elastic pressure roller is arranged on the reel and elastically pressed on the reel core; a guide roller group is further arranged between the reel and the forming rolling device, a sliding base is arranged at the bottom of the guide roller group, and the guide roller group is horizontally slidably arranged on the sliding base in parallel to the reel.

2. The continuous rolling production line according to claim 1, characterized in that: Each of the rolling roller groups has an upper roller and a lower roller, and corresponding rolling rectangular grooves are formed on the surfaces of the upper roller and the lower roller.

3. The continuous rolling production line according to claim 2, characterized in that: a straightening roller group is further arranged at the front side of the heating device.

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