Cold rolling mill

Abstract

The invention relates to the field of steel pipe cold rolling, in particular to a cold rolling mill which comprises a workbench, a feeding mechanism and a feeding swing mechanism which are used for machining and rolling pipe blanks are arranged on the workbench, and a main motor is arranged on the workbench. When the pipe blank is conveyed from the feeding mechanism to the feeding slewing mechanism, the pipe blank axially passes through a correcting mechanism for expanding indentations on the surface of the pipe blank, a flattening mechanism for flattening indentations on the outer surface of the pipe blank, and an oiling device for oiling the outer surface of the pipe blank so as to reduce abrasion of the outer surface of the pipe blank. The wall thickness of the pipe blank is pressed to be uniform as much as possible through the correcting mechanism and the leveling mechanism, the repeated cold rolling frequency of the pipe blank can be reduced as much as possible, and the working efficiency of the cold rolling mill is improved.

Description

Technical Field

[0001] The present invention belongs to the field of cold rolling of steel pipes, and particularly relates to a cold rolling mill. Background Art

[0002] The cold rolling mill is used to process rolled pieces. The rolled pieces to be processed pass between two rotating working rolls. The rotating working rolls apply forming pressure to the rolled pieces, causing plastic deformation of the rolled pieces, thereby achieving rolling.

[0003] In the related art, the rolling mill will perform preliminary rolling on the tube blank during operation, changing its cross-sectional dimensions and mechanical properties to ensure that the tube blank can be accurately placed in the roll rolling area to obtain the required cold-rolled steel pipe product. During this process, since the tube blank rotates while advancing, the wall thickness of the tube blank after preliminary rolling is uneven, resulting in the need to repeat pressing the tube blank multiple times during cold rolling, which affects the working efficiency of the cold rolling mill. Summary of the Invention

[0004] In order to improve the working efficiency of the cold rolling mill as much as possible, the present application provides a cold rolling mill.

[0005] The cold rolling mill provided by the present application adopts the following technical solutions: A cold rolling mill includes a workbench. A feeding mechanism and a feeding and rotating mechanism are arranged on the workbench in the feeding direction of the tube blank. Between the feeding mechanism and the feeding and rotating mechanism, there are successively arranged an oiling device for applying oil to the outer surface of the tube blank to reduce the surface friction of the tube blank; a correction mechanism, including a correction gear ring driven by a main motor. The correction gear ring is rotatably connected to the workbench. A number of correction blocks that move closer to or away from the tube blank are arranged on the correction gear ring. The rotation speed of the number of correction blocks is greater than the rotation speed of the tube blank. An arc-shaped through groove is opened on one side of the number of correction blocks close to the tube blank. The inner walls of the number of arc-shaped through grooves are in contact with the outer wall of the tube blank; a leveling mechanism for removing the indentations on the outer surface of the tube blank.

[0006] By adopting the above technical solutions, the main motor drives the correction gear ring to rotate, causing the correction blocks to rotate along the indentations on the tube blank after preliminary rolling. In the related art, the indentation patterns are mostly caused by uneven wall thickness of the tube blank during preliminary rolling. The speed of the correction blocks is greater than the rotation speed of the tube blank, enabling the correction blocks to follow the indentation patterns on the tube blank and gradually expand the indentation patterns, so that the indentation patterns on the tube blank can cover the outer surface of the tube blank as much as possible, thereby making the wall thickness of the tube blank uniform and reducing the number of times of repeated cold rolling of the tube blank as much as possible, increasing the working efficiency of the cold rolling mill.

[0007] At the same time, the leveling mechanism further smooths the indentations on the tube blank to ensure the uniformity of the wall thickness on the outer surface of the tube blank as much as possible.

[0008] In addition, an oiling device is used to apply an oil layer to the outer surface of the tube blank before it enters the correction mechanism and the leveling mechanism, which can minimize the wear of the outer surface of the tube blank generated by the correction mechanism and the leveling mechanism.

[0009] Optionally, the correction mechanism further includes a correction chuck axially rotatably arranged on the correction gear ring. A spiral groove is formed on the side of the correction chuck away from the correction gear ring. A number of sliding blocks consistent with the number of correction blocks are slidably connected to the correction chuck. A number of protrusions extending into the spiral groove are arranged on the sliding blocks. The several protrusions slide along the spiral groove, and the side of the sliding block facing the tube blank is fixedly connected to the corresponding correction block.

[0010] By adopting the above technical solution, the protrusions slide along the spiral groove, so that the sliding block can move closer to or away from the tube blank, and further the time correction block moves closer to or away from the tube blank, enabling the user to adjust the pressure between the correction block and the tube blank.

[0011] Optionally, a chuck housing is sleeved on the correction chuck. The chuck housing is fixedly connected to the correction gear ring. A number of sliding grooves consistent with the number of sliding blocks are formed on the chuck housing. The several sliding grooves are provided with openings in the direction towards the tube blank. The several sliding blocks are arranged in the sliding grooves and slide along the direction in which the sliding grooves are formed. Limiting plates for limiting the moving distance of the sliding blocks are arranged on the inner walls on both sides of the openings of the sliding grooves.

[0012] By adopting the above technical solution, the direction of movement of the sliding block is limited by the sliding groove, preventing the sliding block from shifting on the correction chuck.

[0013] Optionally, a bevel gear ring is arranged on the outer side wall of the correction chuck. A correction motor is arranged on the correction gear ring. A bevel gear is arranged at the end of the power rod of the correction motor. The bevel gear penetrates through the side wall of the chuck housing and meshes with the bevel gear ring.

[0014] By adopting the above technical solution, the correction motor drives the correction chuck to rotate. Since the chuck housing is fixed relative to the correction gear, the chuck housing remains stationary when the correction chuck rotates.

[0015] Optionally, the leveling mechanism includes a leveling gear ring rotatably connected to the workbench. A first transmission gear and a second transmission gear are arranged on the workbench. A power gear is arranged on the power rod of the main motor. The power gear meshes with the first transmission gear. The first transmission gear meshes with the correction gear ring. The first transmission gear meshes with the second transmission gear. The second transmission gear meshes with the leveling gear ring. The rotation directions of the correction gear ring and the leveling gear ring are opposite.

[0016] By adopting the above technical solution, the main motor drives the first transmission gear to rotate. At this time, the rotation direction of the first transmission gear is opposite to that of the main motor. The first transmission gear drives the correction gear ring to rotate. At this time, the rotation direction of the correction gear ring is the same as that of the main motor. Similarly, the rotation direction of the second transmission gear is the same as that of the main motor, and the rotation direction of the smoothing gear ring meshing with the second transmission gear is opposite to that of the main motor, so that the smoothing gear ring and the correction gear ring rotate in opposite directions.

[0017] Optionally, a leveling chuck group is provided on one side of the leveling gear ring close to the correction mechanism, and a leveling block that slides toward or away from the center of the leveling hole is slidably provided on the leveling chuck group, and the leveling block is extruded with the tube blank.

[0018] By adopting the above technical solution, the flattening block and the tube blank are squeezed to remove the possible remaining indentations or protrusions on the outer surface of the tube blank, and the surface of the tube blank is pressed to be as smooth as possible.

[0019] Optionally, an annular inner frame is provided on the side of the leveling gear ring away from the leveling chuck group, the annular inner frame is fixedly connected to the workbench, the leveling gear ring is sleeved on the annular inner frame, a plurality of deoiling rods are provided on the side of the annular inner frame away from the leveling gear ring, and a plurality of deoiling rods are provided with deoiling sponges that fit the outer shell of the tube blank.

[0020] By adopting the above technical solution, the oil stains on the outer surface of the tube blank are removed by the degreasing sponge, and at the same time, the annular inner frame is fixed to the workbench to facilitate the staff to disassemble and replace the degreasing sponge.

[0021] Optionally, the oiling device includes an oiling tank, a fixed inner ring is axially arranged on the correction gear ring, the fixed inner ring is fixedly connected to the workbench, the oiling tank is axially arranged on the side of the fixed inner ring away from the correction chuck, an oil spray roller is rotatably connected in the oiling tank, an oil chamber is provided in the oil spray roller, a plurality of spray holes are provided on the oil spray roller, an oil storage tank is provided on the fixed inner ring, and the side of the oil spray roller away from the fixed inner ring is connected to the oil storage tank pipeline.

[0022] By adopting the above technical solution, oil and water are sprayed on the outer surface of the tube blank through the rotation of the oil spray roller, and the oil storage tank can avoid insufficient oil and water in the oil spray roller as much as possible.

[0023] Optionally, a spray rod is provided on one side of the spray roller close to the correction gear ring, the spray rod penetrates the oil smear tank and extends toward the correction gear ring, an spray gear is provided at the extended end of the spray rod, and the spray gear is meshed with the inner ring of the correction gear ring.

[0024] By adopting the above technical solution, the oil spray roller and the correction gear ring rotate synchronously, which can minimize the oil and water loss in the oil spray roller. At the same time, controlling the rotation of the oil spray roller by gear linkage can effectively reduce costs.

[0025] Optionally, a number of oil wiping rods are arranged in the oil wiping tank, and oil wiping sponges are axially sleeved on the oil wiping rods, and the oil wiping sponges are attached to the outer wall of the tube blank.

[0026] By adopting the above technical solution, the oil and water sprayed on the outer surface of the tube blank are evenly smeared by the oil wiping sponge.

[0027] In summary, the present application includes at least one of the following beneficial technical effects: 1. By the correction mechanism and the flattening mechanism, the wall thickness of the tube blank is pressed as evenly as possible, which can minimize the number of times of repeated cold rolling of the tube blank and increase the working efficiency of the cold rolling mill; 2. It can minimize the wear of the outer surface of the tube blank generated by the correction mechanism and the flattening mechanism. Description of the Drawings

[0028] Figure 1 is a top view schematic diagram of the overall structure of the present application Figure 2 is Figure 1 a partial enlarged schematic diagram of part A in Figure 3 is an exploded view of the correction mechanism and the flattening mechanism in the present application; Figure 4 a side view of the present application, mainly showing the annular inner frame; Figure 5 is Figure 4 a sectional schematic diagram along the A-A plane in Figure 6 is Figure 3 a partial enlarged schematic diagram of part B in

[0029] Description of the Drawings: 1. Workbench; 2. Correction mechanism; 201. Correction gear ring; 202. Correction chuck; 203. Correction motor; 204. Chuck housing; 205. Correction block; 3. Flattening mechanism; 301. Flattening gear ring; 302. Flattening block; 303. Flattening motor; 4. Oil application device; 401. Oil application tank; 402. Oil application hole; 403. Oil application rod; 404. Oil spraying roller; 405. Oil spraying rod; 406. Oil storage tank; 5. Fixed outer ring; 6. Fixed inner ring; 601. First billet hole; 602. First connecting bearing; 7. Oil removal rod; 8. Inlet oil pipe; 9. Outlet oil pipe; 10. First locking part; 11. Correction hole; 12. Oil spraying gear; 13. Main motor; 14. Power gear; 15. First transmission gear; 16. Second transmission gear; 17. Positioning ring groove; 18. Connecting ring; 19. Chuck hole; 20. Flattening chuck group; 21. Bevel gear ring; 22. Spiral groove; 23. Sliding block; 24. Sliding groove; 25. Limiting plate; 26. Connecting plate; 27. Arc-shaped through groove; 28. Ring-shaped outer frame; 29. Ring-shaped inner frame; 30. Second connecting bearing; 31. Second locking part; 32. Second billet hole; 33. Flattening hole; 34. Feeding mechanism; 35. Feeding and rotating mechanism. Detailed Description of the Invention

[0030] The following is a further detailed description of the present application in conjunction with the attached Figure 1 - attached Figure 6 drawings.

[0031] A cold rolling mill, referring to Figure 1 and Figure 2 , includes a workbench 1, on which a feeding mechanism 34 and a feeding and rotating mechanism 35 are arranged. In the feeding direction of the billet, an oil application device 4, a correction mechanism 2 and a flattening mechanism 3 are sequentially arranged between the feeding mechanism 34 and the feeding and rotating mechanism 35. Among them, the oil application device 4 is used for applying oil to the outer wall of the billet; the correction mechanism 2 is used for expanding the indentation and correcting the thickness of the billet; the flattening mechanism 3 is used for removing the protrusions on the surface of the billet.

[0032] Referring to Figure 3 , a fixed outer ring 5 is fixedly connected to the workbench 1, and a fixed inner ring 6 is axially embedded in the inner wall of the fixed outer ring 5. The fixed inner ring 6 is axially provided with a first billet hole 601 for the billet to pass through.

[0033] Referring to Figure 2 and Figure 3 , the oil application device 4 includes an oil application tank 401 axially connected to one side of the fixed inner ring 6 close to the feeding device, and the oil application tank 401 is axially provided with an oil application hole 402 for the billet to pass through.

[0034] Referring to Figure 3 and Figure 5Two oiling rods 403 are fixedly connected to the two opposite inner walls of the oiling box 401, and an oiling sponge is fixedly connected to the side of the oiling rod 403 close to the through hole. An oiling roller 404 is arranged in a triangle with the two oiling rods 403 in the oiling box 401, and an oil cavity for storing oil is provided in the oiling roller 404, and a plurality of spray holes connected to the oil cavity are provided on the side wall of the oiling roller 404, and an oiling sponge is axially sleeved on the oiling roller 404.

[0035] refer to Figure 5 The spray roller 404 is fixedly connected to the outer wall of the fixed inner ring 6 with a spray rod 405, and the spray rod 405 is rotatably connected to the side wall of the oiling tank 401. The fixed inner ring 6 is fixedly connected to an oil storage tank 406, and the outer wall of the spray roller 404 away from the fixed inner ring 6 is axially provided with an oil inlet pipe 8.

[0036] One end of the oil inlet pipe 8 extends into the oil cavity, and the other end of the oil inlet pipe 8 is connected to the oil storage tank 406, so that the oil in the oil storage tank 406 can enter the oil cavity through the oil inlet pipe 8. In addition, an oil collecting pipe 9 is provided at the bottom of the oil wiping tank 401, and the oil collecting pipe 9 is connected to an oil collecting pump and connected to the oil storage tank 406 through the oil collecting pump, so that the excess oil in the oil wiping tank 401 can be recovered into the oil storage tank 406.

[0037] refer to Figure 3 A first connecting bearing 602 is axially sleeved on the fixed inner ring 6, wherein the first connecting bearing 602 is arranged between the inner wall of the fixed outer ring 5 and the outer wall of the fixed inner ring 6, and in order to limit the deviation and rotation of the fixed inner ring 6, a first locking member 10 is arranged on the fixed outer ring 5, wherein the first locking member 10 can be composed of a fixing plate and a screw, and the fixing plate is fixedly connected to one side of the fixed outer ring 5, and the screws pass through the fixing plate and the fixed inner ring 6 respectively, and the screws are threadedly connected to the fixed inner ring 6.

[0038] refer to Figure 3 , Figure 5 The correction mechanism 2 includes a correction gear ring 201 axially connected to the first connecting bearing 602 away from the oiling box 401, and a gap is provided between the correction gear ring 201 and the fixed inner ring 6. A correction tooth hole 11 for the tube blank to pass through is axially opened in the correction gear ring 201, and an oil injection gear 12 is fixedly connected to the end of the oil injection rod 405 away from the oil injection roller 404, and the oil injection gear 12 is meshed with the correction tooth hole 11.

[0039] refer to Figure 2 , Figure 3 The correction mechanism 2 also includes a main motor 13 fixedly connected to the workbench 1, a power gear 14 is fixedly connected to the end of the power rod of the main motor 13, a first transmission gear 15 is rotatably connected to the workbench 1, the power gear 14 is meshed with the first transmission gear 15, and the first transmission gear 15 is meshed with the outer ring of the correction gear ring 201, so that the main motor 13 can drive the correction gear to rotate.

[0040] On one side of the corrected gear ring 201 away from the oil wiping tank 401, a positioning inner ring and a positioning outer ring are provided. The positioning inner ring and the positioning outer ring form a positioning ring groove 17. A number of ball bearings are provided on both the positioning inner ring and the positioning outer ring, and the number of ball bearings are arranged on the side walls on both sides of the positioning ring groove 17.

[0041] Reference Figure 3 、 Figure 5 、 Figure 6 The correction mechanism 2 further includes a correction chuck 202 axially arranged on the corrected gear ring 201. A connecting ring 18 is provided on one side of the correction chuck 202 close to the corrected gear ring 201. The connecting ring 18 extends into the positioning ring groove 17 and abuts against a number of ball bearings.

[0042] A chuck hole 19 for the tube blank to pass through is formed in the correction chuck 202. The diameter of the chuck hole 19 is smaller than the diameter of the oil injection gear 12. One end of a guide tube is fixedly connected to the inner wall of the correction chuck 202. The other end of the guide tube passes through the correction hole and is connected to the oil wiping tank 401, and is fixedly connected to the inner wall of the oil wiping hole 402 close to the fixed inner ring side, so that the tube blank enters the correction chuck 202 after passing through the oil wiping hole 402 and then passing through the inside of the guide tube, thereby preventing the oil stain on the tube blank from leaking out.

[0043] Reference Figure 2 、 Figure 6 A bevel gear ring 21 is fixedly connected to the outer wall of the correction chuck 202. A correction motor 203 is fixedly connected to the workbench 1. A bevel gear meshing with the bevel gear ring 21 is fixedly connected to the end of the power rod of the correction motor 203. The correction motor 203 can drive the correction chuck 202 to rotate in the positioning ring groove 17.

[0044] A spiral groove 22 is provided on one side of the correction chuck 202 away from the corrected gear ring 201. Three sliding blocks 23 arranged in a triangular pattern are provided on one side of the correction chuck 202 away from the corrected gear ring 201, and a number of protrusions extending into the spiral groove 22 are provided on all three sliding blocks 23.

[0045] A chuck housing 204 is fixedly connected to the corrected gear ring 201. The chuck housing 204 is axially sleeved outside the correction chuck 202. Sliding grooves 24 corresponding to the positions of the three sliding blocks 23 are formed in the chuck housing 204, and the length directions of all three sliding grooves 24 are radially arranged with respect to the correction chuck 202.

[0046] At the openings of the three sliding grooves 24, limit plates 25 for restricting the sliding distance of the sliding blocks 23 are provided. Connecting plates 26 are fixedly connected to the three sliding blocks 23, and correction blocks 205 are fixedly connected to the three connecting plates 26. The three correction blocks 205 are arranged in the chuck hole 19. An arc-shaped through groove 27 is formed on the side of the correction block 205 facing the center of the chuck hole 19, and the inner wall of the arc-shaped through groove 27 abuts against the outer wall of the tube blank.

[0047] It should be noted that the correction motor 203 drives the rotation of the correction chuck 202, causing the sliding block 23 to move in the corresponding sliding groove 24, and driving the correction block 205 to move closer to or away from the center of the chuck hole 19.

[0048] Reference Figure 2 、 Figure 3 、 Figure 4 The workbench 1 is fixedly connected with an annular outer frame 28. An annular inner frame 29 is axially embedded in the annular outer frame 28. A second connecting bearing 30 is sleeved on the annular inner frame 29. The second connecting bearing 30 is arranged between the annular inner frame 29 and the annular outer frame 28. A second locking member 31 for preventing the annular inner frame 29 from shifting is arranged on the annular outer frame 28.

[0049] The flattening mechanism 3 includes a flattening gear ring 301 fixedly connected to the second connecting bearing 30. The flattening gear ring 301 is coaxially arranged with the correction gear ring 201. Tooth blocks are arranged on the outer ring of the flattening gear ring 301. A second transmission gear 16 is rotatably connected to the workbench 1. The second transmission gear 16 meshes with the first transmission gear 15, and the second transmission gear 16 meshes with the outer ring of the flattening gear ring 301, causing the flattening gear ring 301 and the correction gear ring 201 to rotate coaxially in opposite directions.

[0050] It should be noted that a second tube blank hole 32 for the tube blank to pass through is formed in the annular inner frame 29, and a flattening hole 33 for the tube blank to pass through is formed in the flattening gear ring 301. The diameters of the second tube blank hole 32 and the flattening hole 33 are the same as that of the chuck hole 19.

[0051] Reference Figure 2 、 Figure 3 、 Figure 6 On the side of the flattening gear ring 301 close to the correction gear ring 201, a flattening chuck group 20 is provided. The structure of the flattening chuck group 20 is the same as the combined structure of the correction chuck 202 and the chuck housing 204 and is symmetrically arranged. A flattening block 302 that slides closer to or away from the center of the flattening hole 33 is slidably arranged on the flattening chuck group 20. The flattening block 302 has the same structure as the correction block 205 and is symmetrically arranged. A flattening motor 303 for driving the flattening block 302 to slide is fixedly connected to the flattening gear ring 301.

[0052] Reference Figure 4, on the side of the annular inner frame 29 away from the flat tooth ring 301, four oil-removing rods 7 are fixedly connected, and the four oil-removing rods 7 are arranged close to the edge of the second billet hole 32. Oil-removing sponges are axially sleeved on the four oil-removing rods 7, which are used to remove the oil stains on the outer wall of the billet for reducing wear, so as to avoid the position deviation caused by slipping of the billet in the subsequent processes as much as possible. In addition, the oil-removing rods 7 arranged on the annular inner frame 29 facilitate the user to disassemble and replace the oil-removing sponges sleeved on them.

[0053] The implementation principle of this application is as follows: The main motor 13 drives the first transmission gear 15 to rotate, the first transmission gear 15 drives the correction gear and the second transmission gear 16 to rotate. At this time, the rotation direction of the correction gear is the same as that of the second transmission gear 16. The second transmission gear 16 drives the flat tooth ring 301 to rotate, and the rotation direction of the second transmission gear 16 is opposite to that of the flat tooth ring 301, so that the flat tooth ring 301 and the correction tooth ring 201 rotate in opposite directions.

[0054] When the correction tooth ring 201 rotates, the oil injection gear 12 meshing with the inner ring of the correction tooth ring 201 rotates synchronously, so that the oil injection rod 405 rotates and drives the oil injection roller 404 to rotate. After the oil injection roller 404 rotates, the oil in the oil cavity sprays out from the spray holes, wets and adsorbs on the oiling sponge. The oiling sponge oils the outer wall of the billet entering the oiling tank 401, and the oil on the billet is evenly smeared by the oiling sponges on the two oiling rods 403 to reduce the friction force on the outer wall surface of the billet.

[0055] The billet passes through the oiling tank 401 and enters the correction chuck 202. After entering the correction chuck 202, the correction motor 203 drives the correction chuck 202 to rotate, so that the three correction blocks 205 approach the billet and squeeze the billet, and the arc-shaped through grooves 27 of the correction blocks 205 are in contact with the billet.

[0056] Due to the self-rotation of the billet, there is sliding between the billet and the correction block 205. In addition, the correction block 205 will rotate following the correction tooth ring 201, and the self-rotation direction of the billet is the same as the rotation direction of the correction block 205, and the rotation speeds of the two are different. The correction block 205 can gradually expand outward along the indentation during the initial rolling of the billet, which can minimize the damage to the billet or the damage to the correction block 205 caused by the extrusion between the billet indentation and the correction block 205, so as to gradually press the wall thickness of the billet to be close to the same.

[0057] After the wall thickness of the billet is pressed to be close, it enters the flat chuck group 20 with the same structure as the correction chuck 202. The flat blocks 302 in the flat chuck group 20 squeeze the billet, and because the flat tooth ring 301 and the correction tooth ring 201 rotate in opposite directions, the rotation direction of the flat block 302 is opposite to that of the correction block 205. The flat block 302 rotating in the opposite direction is used to flatten the indentation that may be caused by the correction block 205 or the protrusions on the billet that have not been ground flat.

[0058] In addition, it should be noted that when the correction block 205 and the flattening block 302 extrude the tube blank, they both cooperate with a mandrel placed inside the tube blank to extrude the tube blank wall, which can avoid damage to the tube blank during extrusion.

[0059] After passing through the flattening chuck group 20, the oil stain on the outer wall of the tube blank is removed by an oil removal sponge to prevent the tube blank from slipping during subsequent rolling, thus affecting the rolling effect.

[0060] The embodiments of this specific implementation manner are all preferred embodiments of this application, and do not limit the protection scope of this application accordingly. Identical components are denoted by the same reference numerals. Therefore, all equivalent changes made according to the structure, shape, and principle of this application should be covered within the protection scope of this application.

Claims

1. A cold rolling mill, comprising a workbench (1), wherein a feeding mechanism (34) and a feeding and rotating mechanism (35) are arranged on the workbench (1) in the feeding direction of the tube blank, and it is characterized in that: An oiling device (4), a correcting mechanism (2), and a flattening mechanism (3) are sequentially arranged between the feeding mechanism (34) and the feeding and rotating mechanism (35). The oiling device (4) oils the outer surface of the tube blank to reduce the surface friction of the tube blank; The correcting mechanism (2) includes a correcting gear ring (201) driven by a main motor (13). The correcting gear ring (201) is rotatably connected to the workbench (1). A plurality of correcting blocks (205) approaching or departing from the tube blank are arranged on the correcting gear ring (201). The rotating speeds of the plurality of correcting blocks (205) are all greater than the rotating speed of the tube blank. An arc-shaped through groove (27) is formed on one side of each of the plurality of correcting blocks (205) close to the tube blank. The inner walls of the plurality of arc-shaped through grooves (27) are all in contact with the outer wall of the tube blank; The flattening mechanism (3) is used to remove the indentation on the outer surface of the tube blank.

2. A cold rolling mill according to claim 1, characterized in that: The correcting mechanism (2) further includes a correcting chuck (202) axially and rotatably arranged on the correcting gear ring (201). A spiral groove (22) is formed on one side of the correcting chuck (202) far from the correcting gear ring (201). A plurality of sliding blocks (23) with the same number as the correcting blocks (205) are slidably connected to the correcting chuck (202). A plurality of convex blocks extending into the spiral groove (22) are arranged on the sliding blocks (23). The plurality of convex blocks slide along the spiral groove (22). One side of the sliding block (23) facing the tube blank is fixedly connected to the corresponding correcting block (205).

3. A cold rolling mill according to claim 2, characterized in that: A chuck housing (204) is sleeved on the correcting chuck (202). The chuck housing (204) is fixedly connected to the correcting gear ring (201). A plurality of sliding grooves (24) with the same number as the sliding blocks (23) are formed on the chuck housing (204). The sliding grooves (24) are provided with openings in the direction of the tube blank. The plurality of sliding blocks (23) are arranged in the sliding grooves (24) and slide along the opening direction of the sliding grooves (24). Limiting plates (25) for limiting the moving distance of the sliding blocks (23) are arranged on the inner walls on both sides of the opening of the sliding groove (24).

4. A cold rolling mill according to claim 3, characterized in that: An umbrella gear ring (21) is arranged on the outer side wall of the correcting chuck (202). A correcting motor (203) is arranged on the correcting gear ring (201). An umbrella gear is arranged at the end of the power rod of the correcting motor (203). The umbrella gear penetrates through the side wall of the chuck housing (204) and meshes with the umbrella gear ring (21).

5. A cold rolling mill according to claim 1, characterized in that: The flattening mechanism (3) includes a flattening gear ring (301) rotatably connected to the workbench (1). A first transmission gear (15) and a second transmission gear (16) are arranged on the workbench (1). A power gear (14) is arranged on the power rod of the main motor (13). The power gear (14) meshes with the first transmission gear (15). The first transmission gear (15) meshes with the correcting gear ring (201). The first transmission gear (15) meshes with the second transmission gear (16). The second transmission gear (16) meshes with the flattening gear ring (301). The rotating directions of the correcting gear ring (201) and the flattening gear ring (301) are opposite.

6. A cold rolling mill according to claim 5, characterized in that: On one side of the leveling tooth ring (301) close to the correction mechanism (2), a leveling chuck group (20) is arranged. A leveling block (302) that slides towards or away from the center of the leveling hole (33) is slidably arranged on the leveling chuck group (20), and the leveling block (302) is in extrusion contact with the tube blank.

7. A cold rolling mill according to claim 6, characterized in that: On the side of the leveling tooth ring (301) away from the leveling chuck group (20), an annular inner frame (29) is arranged. The annular inner frame (29) is fixedly connected to the workbench (1). The leveling tooth ring (301) is sleeved on the annular inner frame (29). On the side of the annular inner frame (29) away from the leveling tooth ring (301), a number of oil removal rods (7) are arranged, and oil removal sponges that fit the outer shell of the tube blank are arranged on the number of oil removal rods (7).

8. A cold rolling mill according to claim 1, characterized in that: The oiling device (4) includes an oiling tank (401). An inner fixed ring (6) is axially arranged on the correction tooth ring (201). The inner fixed ring (6) is fixedly connected to the workbench (1). The oiling tank (401) is axially arranged on the side of the inner fixed ring (6) away from the correction chuck (202). A spray oil roller (404) is rotatably connected in the oiling tank (401). An oil cavity is formed in the spray oil roller (404). A number of spray holes are formed in the spray oil roller (404). An oil storage tank (406) is arranged on the inner fixed ring (6). The side of the spray oil roller (404) away from the inner fixed ring (6) is connected to the oil storage tank (406) through a pipeline.

9. A cold rolling mill according to claim 8, characterized in that: On the side of the spray oil roller (404) close to the correction tooth ring (201), an oil injection rod (405) is arranged. The oil injection rod (405) penetrates through the oiling tank (401) and extends towards the correction tooth ring (201). An oil injection gear (12) is arranged at the extending end of the oil injection rod (405), and the oil injection gear (12) meshes with the inner ring of the correction tooth ring (201).

10. A cold rolling mill according to claim 9, characterized in that: A number of oiling rods (403) are arranged in the oiling tank (401). Oiling sponges are axially sleeved on the oiling rods (403), and the oiling sponges are in contact with the outer wall of the tube blank.

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