A finishing work roll neck repair process

Abstract

The application discloses a finishing work roll neck repairing process and relates to the technical field of roll neck repairing, which comprises the following steps: cleaning and blowing all the oil stains and sundries on the roll neck surface of the roll by using a cleaning agent and compressed air; removing the damage layer and fatigue layer of the roll neck part by using a lathe; after the fatigue layer is completely removed, heating to 500 DEG C in a heating furnace and keeping the temperature for 60 minutes; after preheating and keeping the temperature, continuously alloy submerged-arc surfacing is carried out by using surfacing equipment; gradually cooling to room temperature after the surfacing is completed; after the surfacing, finishing, grinding and oil hole drilling processes are carried out and the roll is restored to the preset size; the size and hardness of the roll neck repairing part are detected, ultrasonic and magnetic powder detections are carried out; after the detection is qualified, the roll is put on a machine for use, and after the roll is used for three times, detection is carried out again; in the application, the roll neck is kept warm by using a heat preservation cylinder while being surfaced, so that the temperature loss rate can be reduced and cracks can be avoided at the surfacing position.

Description

Technical Field

[0001] This invention relates to the field of roll neck repair technology, and specifically to a roll neck repair process for finishing mill work rolls. Background Technology

[0002] Rolls are essential components of rolling mills and are also major consumable parts. They are widely used in metallurgical rolling processes, especially in industries such as automobiles and shipbuilding where plate and strip production places higher demands on the dimensions, surface precision, and performance of rolled steel. As a result, the manufacturing, application, and performance of rolls have developed rapidly.

[0003] Rolls consist of two parts: the outer layer of the roll body and the material of the roll neck. Currently, rolling mills are producing high-efficiency products with extremely thin dimensions, high performance enhancement, and high-end surface finishes. Therefore, the development of roll manufacturing focuses on using more alloys for the outer layer of the roll body, resulting in a finer, more uniform structure and superior performance. However, the strength and wear resistance of the core roll neck are often neglected. Roll manufacturing processes tend to prioritize increasing the hardness, toughness, and strength of the roll body, thereby reducing the hardness and wear resistance of the roll neck. As a result, when the outer layer of the roll reaches half of its service life, the roll neck experiences significant wear, rendering it unusable and impacting production stability and product dimensional quality.

[0004] When the roll neck is abnormally worn and can no longer be used, but there are still many working layers of rolls that can be used, in order to ensure the stability of the rolling line production, the rolls are terminated and scrapped in advance, resulting in a large waste of rolls and an increase in the cost of steel rolling.

[0005] In the existing technology, the roller neck is usually repaired by welding. However, before welding repair, the roller neck needs to be heated and kept warm in a heating furnace for a period of time to slow down the cooling rate of the weld metal and reduce the thermal stress generated during the welding process. However, since welding repair requires the roller neck to be exposed to the air, its temperature drops too quickly, and the weld layer is prone to cracking. Summary of the Invention

[0006] The purpose of this invention is to provide a process for repairing the neck of a finishing mill work roll, thereby solving the following technical problems: Before welding repair, the roll neck needs to be heated and kept warm in a heating furnace for a period of time to slow down the cooling rate of the weld metal, thereby reducing the thermal stress generated during the welding process. However, since welding repair requires exposing the roll neck to the air, its temperature drops too quickly, and the weld layer is prone to cracking.

[0007] The objective of this invention can be achieved through the following technical solutions: A process for repairing the neck of a finishing mill work roll includes the following steps: Clean and blow away all oil and debris from the roll neck surface using cleaning agents and compressed air; Remove the damaged and fatigue layers at the roll neck area on a lathe. After the fatigue layer is completely removed, heat it to 500 degrees in a heating furnace and hold it at that temperature for 60 minutes. After preheating and heat preservation, continuous alloy submerged arc welding is carried out using a welding equipment; After the welding is completed, gradually cool to room temperature; After welding, precision turning, grinding, and drilling of oil holes are performed, and the material is restored to the preset dimensions. The dimensions and hardness of the repaired roll neck area were inspected, and ultrasonic and magnetic particle testing were performed. After passing the inspection, the machine can be put back into use. After three uses, it will be tested again for confirmation.

[0008] Preferably, the welding equipment includes a workbench, on which a positioning module for fixing the roll is provided, an insulation cylinder is arranged on one side of the workbench, and a first through groove for passing through the roll neck is opened on one side of the insulation cylinder; The workbench is also equipped with a drive module, which is used to push the fixed roll neck into the insulation cylinder. The insulation cylinder is equipped with a welding gun mechanism for overlay welding of the roller neck that extends into the insulation cylinder.

[0009] Preferably, the positioning module includes a positioning ring, with drive rings symmetrically fixed on both sides of the positioning ring. The outer diameter of the drive rings on both sides is larger than the outer diameter of the positioning ring. Four sets of arc-shaped grooves are circumferentially arrayed on the drive rings on both sides, extending from the near-center end to the far-center end. Positioning shafts are slidably arranged in the corresponding arc-shaped grooves on the drive rings on both sides. Drive plates are symmetrically fixed at both ends of the positioning shafts, and the other end of the drive plates is fixed to the clamping seat. The positioning module also includes a rotating part, which is used to drive the positioning ring to rotate.

[0010] Preferably, the positioning module further includes a support frame, in which a circular groove is formed, and an adjustment ring is rotatably arranged in the circular groove. Four sets of guide grooves are formed in a circumferential array on the adjustment ring. The guide grooves are straight grooves that extend from the near center end to the far center end. A guide shaft is slidably arranged in the guide groove, and the guide shaft is fixed to the positioning shaft by a connecting plate.

[0011] Preferably, the rotating part includes an arc-shaped rack fixedly arranged on the outer edge of one side of the drive ring, a first motor fixedly arranged on one side of the adjusting ring, and a first gear for meshing with the arc-shaped rack fixedly arranged at the output end of the first motor.

[0012] Preferably, a toothed ring is fixedly arranged on one side of the adjusting ring; A second motor is fixedly mounted on one side of the support frame, and a second gear for meshing with a gear ring is fixedly mounted on the output end of the second motor.

[0013] Preferably, the drive module includes support plates symmetrically fixed on the workbench, a lead screw rotatably arranged between the two sets of support plates, one end of the lead screw being fixed to the output end of a third motor fixed on the outside of the support plate, a nut being spirally sleeved on the lead screw, a mounting plate being fixedly arranged on the nut, and a support frame being mounted on the mounting plate.

[0014] Preferably, the mounting plate is rotatably provided with a rotating shaft fixed to the support frame, and a fourth motor is also fixedly provided on one side of the bottom of the mounting plate. The output end of the fourth motor is connected to the rotating shaft through a pulley mechanism.

[0015] Preferably, the welding gun mechanism includes a welding gun for overlay welding arranged in an insulation cylinder, and the other end of the welding gun for overlay welding is connected to a flux delivery pipe; The welding torch mechanism further includes an adjustment unit, which drives the welding torch to move within the insulation cylinder to correspond to the position to be repaired on the roller neck.

[0016] Preferably, the adjusting part includes a groove formed on the heat preservation cylinder, a sealing plate is slidably arranged in the groove, the length of the sealing plate is twice the length of the groove along the axis of the heat preservation cylinder, and a through hole for inserting a material conveying pipe is formed in the middle of the sealing plate. The material conveying pipe is also slidably fitted with a limiting plate, which is connected to a motion module that drives it to move along the axial direction of the insulation cylinder.

[0017] The beneficial effects of this invention are: (1) When the present invention repairs the roll neck by welding, the heated roll is first positioned and fixed by the positioning module, and then the roll is driven to move towards the heat preservation cylinder by the driving module so that the roll neck passes through the first through groove and extends into the heat preservation cylinder. The wear area of ​​the roll neck is repaired by welding by the welding gun mechanism. In the present invention, the roll neck is kept warm by the heat preservation cylinder while welding, which can reduce the rate of temperature loss and avoid cracks at the weld. (2) In this invention, after the roll neck on one side of the roll is heated by the heating furnace, the roll neck is pulled out of the heating furnace and the fourth motor is started to drive the rotating shaft to rotate 180 degrees so that the roll neck is rotated to the side facing the heat preservation cylinder, so that it can be directly inserted into the heat preservation cylinder for welding repair. There is no need to disassemble the roll to adjust the angle, the degree of automation is higher, and the repair efficiency is improved. Attached Figure Description

[0018] The invention will now be further described with reference to the accompanying drawings.

[0019] Figure 1 This is a schematic diagram of a finishing mill work roll neck repair process according to the present invention; Figure 2 This is a schematic diagram of the welding equipment used in the repair process of the neck of a finishing mill work roll according to the present invention. Figure 3 This is a schematic diagram of the positioning module of the welding equipment in the repair process of the neck of a finishing work roll according to the present invention. Figure 1 ; Figure 4 This is a schematic diagram of the positioning module of the welding equipment in the repair process of the neck of a finishing work roll according to the present invention. Figure 2 ; Figure 5 This is a top view of the positioning module of the welding equipment in the repair process of the neck of a precision rolling work roll according to the present invention. Figure 6 This is a schematic diagram of the structure of the insulation cylinder of the welding equipment in the repair process of the neck of a finishing mill work roll according to the present invention; Figure 7 This is a schematic diagram of the welding gun mechanism of the positioning module of the welding equipment in the repair process of the neck of a precision rolling work roll according to the present invention. Figure 8 This is a schematic diagram of the internal structure of the insulation cylinder of the welding equipment in the repair process of the neck of a finishing mill work roll according to the present invention; Figure 9 This is a schematic diagram of the scraper structure of the welding equipment in the neck repair process of a precision rolling mill work roll according to the present invention.

[0020] In the diagram: 1. Workbench; 2. Insulation cylinder; 3. Heating furnace; 4. Roller; 5. Support frame; 6. Gear ring; 101. Support plate; 102. Third motor; 103. Lead screw; 104. Nut; 105. Pulley mechanism; 106. Mounting plate; 107. Rotating shaft; 108. Fourth motor; 201. Limiting plate; 202. Conveying pipe; 203. Sealing plate; 204. Slide chute; 205. Collection box; 206. First through channel; 207. Welding torch; 208. Support plate; 209. Electric telescopic rod; 210. Discharge chute; 2 11. Scraper; 212. Telescopic sleeve; 213. Spring; 214. Inclined surface; 215. Camera; 216. Motion module; 301. Second through groove; 401. Roller neck; 501. Circular groove; 502. Adjusting ring; 503. Guide groove; 504. Guide shaft; 505. Drive ring; 506. Arc groove; 507. Positioning shaft; 508. Drive plate; 509. First motor; 510. Second motor; 511. Clamping seat; 601. Second gear; 602. First gear; 603. Arc rack; 604. Positioning ring. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Example 1

[0023] Please see Figure 1 As shown, the present invention is a process for repairing the neck of a finishing mill work roll, comprising the following steps: S100. Clean and blow away all oil and debris from the surface of the roll neck 401 of the roll 4 with cleaning agent and compressed air to avoid reducing the weld cladding bond strength. S200, Remove the damaged and fatigue layers from the roll neck 401 area on a lathe, with a turning depth of not less than 5 mm; S300. After the fatigue layer is completely removed, heat it to 500 degrees in heating furnace 3 and hold it for 60 minutes. After S400, preheating, and heat preservation, continuous alloy submerged arc welding is performed using a welding equipment to restore the thickness to the design size of 0.5mm or more. S500, after the welding is completed, gradually cool to room temperature; S600, after welding, performs precision turning, grinding and drilling of oil holes and restores to the preset size; S700, inspect the dimensions and hardness of the repaired part of the roll neck, and perform ultrasonic and magnetic particle testing; After passing the S800 test, the machine is put back into use. After three uses, it is tested again for confirmation.

[0024] Example 2

[0025] Based on Example 1, please refer to Figure 2 and Figure 7 The welding equipment includes a workbench 1, on which a positioning module for fixing the roll 4 is provided. A heat preservation cylinder 2 is arranged on one side of the workbench 1, and a first through groove 206 for passing through the roll neck 401 is opened on one side of the heat preservation cylinder 2. It should be noted that after the roller 4 is positioned, its axis coincides with the axis of the insulation cylinder 2; The workbench 1 is also equipped with a drive module, which is used to push the roll neck 401 of the fixed roll 4 into the heat preservation cylinder 2; The insulation cylinder 2 is equipped with a welding gun mechanism for welding the roll neck 401 that extends into the insulation cylinder 2. It can be explained that when welding the roll neck 401 of the roll 4, the heated roll 4 is first positioned and fixed by the positioning module, and then the roll 4 is driven to move towards the insulation cylinder 2 by the driving module, so that the roll neck 401 passes through the first through groove 206 and extends into the insulation cylinder 2. The wear area of ​​the roll neck 401 is welded and repaired by the welding gun mechanism. In this embodiment, the roll neck 401 is kept warm by the insulation cylinder 2 while welding, which can reduce the rate of temperature loss and avoid cracks at the weld.

[0026] As a further solution in this embodiment, please refer to Figure 2 The heating furnace 3 is located on the other side of the workbench 1. The heating furnace 3 has a second through groove 301 for passing through the roll neck 401 in the direction of the positioning module. Specifically, before the roll neck 401 is repaired by welding, the driving module drives the roll 4 to move in the direction of the heating furnace 3 so that the roll neck 401 can pass through the second through groove 301 and enter the heating furnace 3. The heating furnace 3 heats the roll neck 401 to 500 degrees and holds it at that temperature for 60 minutes.

[0027] Please see Figures 3-5 The positioning module includes a positioning ring 604, with drive rings 505 symmetrically fixed on both sides of the positioning ring 604. The outer diameter of the drive rings 505 is larger than that of the positioning ring 604. Four sets of arc-shaped grooves 506 are circumferentially arrayed on the drive rings 505, extending from the near-center end to the far-center end. Positioning shafts 507 are slidably arranged in the corresponding arc-shaped grooves 506 on the drive rings 505. Drive plates 508 are symmetrically fixed at both ends of the positioning shafts 507, and the other end of the drive plates 508 is fixed to the clamping seat 511. The positioning module also includes a rotating part for driving the positioning ring 604 to rotate. It can be explained that when fixing the roll 4, the roll 4 is placed at the axial end of the positioning ring 604, and then the positioning ring 604 is driven to rotate by the rotating part. During the rotation, the positioning ring 604 drives the two driving rings 505 to rotate, and then, under the limiting action of the arc groove 506, it synchronously drives the positioning shaft 507 to move towards the ring center end. Each set of positioning shafts 507 drives the clamping seat 511 to move towards the ring center end through the driving plate 508 and presses it against the outer wall of the roll 4, thereby achieving the effect of clamping and fixing. When it is necessary to disassemble the roll 4, the positioning ring 604 can be driven to rotate in the opposite direction by the rotating part. To ensure that the rotation of the drive ring 505 can drive the positioning shaft 507 to move along a straight line towards or away from the center end of the ring, in this embodiment, the positioning module also includes a support frame 5. A circular groove 501 is formed in the support frame 5, and an adjustment ring 502 is rotatably arranged in the circular groove 501. Four sets of guide grooves 503 are formed in a circumferential array on the adjustment ring 502. The guide grooves 503 are straight grooves that extend from the near center end to the far center end. A guide shaft 504 is slidably arranged in the guide grooves 503. The guide shaft 504 is fixed to the positioning shaft 507 through a connecting plate. It can be noted that when the positioning shaft 507 moves, it synchronously drives the guide shaft 504 to slide in the guide groove 503 to improve the stability of the positioning shaft 507 during movement. The rotating part includes an arc-shaped rack 603 fixedly arranged on the outer edge of a drive ring 505 on one side, and a first motor 509 fixedly arranged on one side of an adjusting ring 502. The output end of the first motor 509 is fixedly arranged with a first gear 602 for meshing with the arc-shaped rack 603. It can be explained that when the first motor 509 is started, the first gear 602 is driven to rotate, and the first gear 602 can drive the drive ring 505 to rotate by meshing with the arc-shaped rack 603.

[0028] Furthermore, during weld overlay repair, in order to handle different angular positions of the roll neck 401, please refer to the following embodiment: Figure 3 and Figure 4 A toothed ring 6 is fixedly arranged on one side of the adjusting ring 502. A second motor 510 is fixedly arranged on one side of the support frame 5. A second gear 601 for meshing with the toothed ring 6 is fixedly arranged at the output end of the second motor 510. It can be explained that during repair, the second motor 510 is started to drive the toothed ring 6 to rotate. The toothed ring 6 drives the adjusting ring 502 to rotate. The adjusting ring 502 synchronously drives the positioned roller 4 to rotate so that the position to be repaired on the roller neck 401 corresponds to the position of the welding gun mechanism.

[0029] In this embodiment, please refer to Figure 3 and Figure 4 The drive module includes support plates 101 symmetrically fixed on the workbench 1, with lead screws 103 rotatably arranged between the two sets of support plates 101. One end of the lead screw 103 is fixed to the output end of a third motor 102 fixed on the outside of the support plates 101. A nut 104 is spirally sleeved on the lead screw 103, and an mounting plate 106 is fixedly arranged on the nut 104. The support frame 5 is mounted on the mounting plate 106. Specifically, when the roller 4 after drive positioning moves toward the insulation cylinder 2 or the heating furnace 3, the third motor 102 is started to drive the lead screw 103 to rotate. At the same time, the nut 104 moves on the lead screw 103 and drives the support frame 5 to move through the mounting plate 106. Furthermore, a rotating shaft 107 fixed to the support frame 5 is rotatably mounted on the mounting plate 106. A fourth motor 108 is also fixedly mounted on one side of the bottom of the mounting plate 106. The output end of the fourth motor 108 is connected to the rotating shaft 107 via a pulley mechanism 105. It can be explained that after the roll neck 401 on one side of the roll 4 is heated by the heating furnace 3, the roll neck 401 is pulled out of the heating furnace 3. Then, the fourth motor 108 is started to drive the rotating shaft 107 to rotate 180 degrees, so that the roll neck 401 is rotated to the side facing the heat preservation cylinder 2, so that it can be directly inserted into the heat preservation cylinder 2 for welding repair. It is not necessary to disassemble the roll 4 to adjust the angle, which increases the degree of automation and improves the repair efficiency.

[0030] Please see Figure 6 and Figure 7 The welding gun mechanism includes a welding torch 207 installed in the insulation cylinder 2. The other end of the welding torch 207 is connected to the flux delivery pipe 202. The welding gun mechanism also includes an adjustment unit, which is used to drive the welding torch 207 to move in the insulation cylinder 2 to correspond to the position to be repaired on the roller neck 401. Specifically, after the roller neck 401 extends into the insulation cylinder 2, the welding torch 207 is driven to move in the insulation cylinder 2 through the adjustment unit so that the welding torch 207 corresponds to the position to be repaired on the roller neck 401, and then the welding torch 207 is started to perform welding repair. Specifically, the adjusting part includes a groove 204 formed on the insulation cylinder 2, in which a sealing plate 203 is slidably arranged. The length of the sealing plate 203 is twice the length of the groove 204 along the axis of the insulation cylinder 2. A through hole for inserting a material conveying pipe 202 is formed in the middle of the sealing plate 203. A limiting plate 201 is also slidably sleeved on the material conveying pipe 202. The limiting plate 201 is connected to a motion module 216 that drives it to move along the axial direction of the insulation cylinder 2. It can be noted that when adjusting the axial position of the welding torch 207... When in position, the motion module 216 drives the limiting plate 201 to move. The limiting plate 201 can drive the sealing plate 203 to slide along the slide groove 204 through the material conveying pipe 202, thereby synchronously adjusting the position of the welding torch 207. During this process, since the length of the sealing plate 203 is twice the length of the slide groove 204 along the axis of the insulation cylinder 2, the sealing plate 203 can always seal the slide groove 204, thereby preventing the air inside and outside the insulation cylinder 2 from flowing in the slide groove 204 and improving the insulation effect of the insulation cylinder 2. In this embodiment, the motion module 216 can be a screw or synchronous belt drive mechanism, or a servo drive device such as a hydraulic cylinder or a pneumatic cylinder. There is no limitation on this, as long as it can drive the limit plate 201 to move along the axial direction.

[0031] In addition, an electric telescopic rod 209 is fixedly installed at the bottom of the sealing plate 203, and a support plate 208 is fixedly installed on the welding torch 207. The electric telescopic rod 209 is fixed to the support plate 208. A camera 215 is also fixedly installed on the support plate 208 facing the axis to monitor the position to be repaired on the roller neck 401. It can be explained that when the motion module drives the welding torch 207 to move axially to the corresponding position, the electric telescopic rod 209 is activated to drive the welding torch 207 to move closer to the position. During this process, the camera 215 takes pictures so that the welding torch 207 corresponds to the repair position. For further details, please refer to Figures 6-9 The insulation cylinder 2 is also equipped with a scraper 211, which is fixed to a telescopic sleeve 212 fixed on the inner wall of the insulation cylinder 2. The telescopic sleeve 212 is also equipped with a spring 213. The scraper 211 is set with an inclined surface 214 in the direction of the first through groove 206. The bottom of the insulation cylinder 2 is provided with a discharge trough 210, which is connected to the collection box 205. It can be noted that during the welding process, the weld slag produced can easily adhere to the roller neck 401. In this embodiment, the roller neck 401 is driven to rotate, and the scraper 211 scrapes off the weld slag on the roller neck 401. At the same time, when the roller neck 401 is inserted into the insulation cylinder 2, the end of the roller neck 401 first abuts against the inclined surface 214. The abutment can push the telescopic sleeve 212 to contract, so that the spring 213 contracts and generates elastic force. Under the action of elastic force, the scraper 211 can be pressed against the roller neck 401 to improve the slag scraping effect.

[0032] The working method of the welding equipment includes the following steps: The roll 4 is placed at the axial end of the positioning ring 604. The positioning ring 604 is driven to rotate through the rotating part. During the rotation, the positioning ring 604 drives the two driving rings 505 to rotate. Under the limiting action of the arc groove 506, the positioning shaft 507 is synchronously driven to move towards the axial end of the ring. Each set of positioning shafts 507 drives the clamping seat 511 to move towards the axial end of the ring through the driving plate 508 and presses it against the outer wall of the roll 4 to achieve fixation. The drive module drives the roll 4 to move toward the heating furnace 3 so that the roll neck 401 can pass through the second through slot 301 and enter the heating furnace 3. The heating furnace 3 heats the roll neck 401 to 500 degrees and holds it at that temperature for 60 minutes. After being heated by the heating furnace 3, the roller neck 401 is pulled out of the heating furnace 3, and the fourth motor 108 is started to drive the rotating shaft 107 to rotate 180 degrees, so as to rotate the roller neck 401 to the side facing the heat preservation cylinder 2. The drive module drives the roller 4 to move toward the insulation cylinder 2, so that the roller neck 401 passes through the first through groove 206 and extends into the insulation cylinder 2; When the motion module drives the welding torch 207 to move axially to the corresponding position, the electric telescopic rod 209 is activated to drive the welding torch 207 to move closer to the position. During this process, the camera 215 takes pictures so that the welding torch 207 corresponds to the repair position and performs welding.

[0033] In the description of this invention, it should be understood that the terms "upper," "lower," "left," and "right," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation or specific orientational structure and operation. Therefore, they should not be construed as limitations on the invention. Furthermore, "first" and "second" are only for descriptive purposes and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, unless otherwise stated, "multiple" means two or more.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0035] The foregoing has provided a detailed description of one embodiment of the present invention, but this description is merely a preferred embodiment and should not be construed as limiting the scope of the invention. All equivalent variations and modifications made within the scope of the claims of this invention should still fall within the patent coverage of this invention.

Claims

1. A process for repairing the neck of a finishing mill work roll, characterized in that, Includes the following steps: Clean and blow away all oil and debris from the surface of the roll neck (401) of the roll (4) with cleaning agent and compressed air; Remove the damaged and fatigue layers at the roll neck (401) area on the lathe; After the fatigue layer is completely removed, it is heated to 500 degrees in a heating furnace (3) and kept at that temperature for 60 minutes; After preheating and heat preservation, continuous alloy submerged arc welding is carried out using a welding equipment; After the welding is completed, gradually cool to room temperature; After welding, precision turning, grinding, and drilling of oil holes are performed, and the material is restored to the preset dimensions. The dimensions and hardness of the repaired roll neck area were inspected, and ultrasonic and magnetic particle testing were performed. After passing the inspection, the machine will be put back into use. After three uses, it will be inspected again for confirmation. The welding equipment includes a workbench (1), on which a positioning module for fixing the roll (4) is provided. A heat insulation cylinder (2) is arranged on one side of the workbench (1), and a first through groove (206) for passing through the roll neck (401) is opened on one side of the heat insulation cylinder (2). The workbench (1) is also equipped with a drive module, which is used to push the neck (401) of the fixed roll (4) into the heat preservation cylinder (2). The insulation cylinder (2) is equipped with a welding gun mechanism for overlay welding of the roller neck (401) extending into the insulation cylinder (2); The drive module includes support plates (101) symmetrically fixed on the workbench (1), and a lead screw (103) rotatably arranged between the two sets of support plates (101). One end of the lead screw (103) is fixed to the output end of a third motor (102) fixed on the outside of the support plate (101). A nut (104) is spirally sleeved on the lead screw (103), and an mounting plate (106) is fixedly arranged on the nut (104). The support frame (5) is installed on the mounting plate (106). The mounting plate (106) is rotatably mounted with a rotating shaft (107) fixed to the support frame (5). A fourth motor (108) is also fixedly mounted on one side of the bottom of the mounting plate (106). The output end of the fourth motor (108) is connected to the rotating shaft (107) through a belt pulley mechanism (105).

2. The process for repairing the neck of a finishing work roll according to claim 1, characterized in that, The positioning module includes a positioning ring (604), with driving rings (505) symmetrically fixed on both sides of the positioning ring (604). The outer diameter of the driving rings (505) on both sides is larger than the outer diameter of the positioning ring (604). Four sets of arc-shaped grooves (506) are arranged in a circumferential array on the driving rings (505). The arc-shaped grooves (506) extend from the near end of the ring to the far end of the ring. The positioning shafts (507) are slidably arranged in the corresponding arc-shaped grooves (506) on the driving rings (505). The two ends of the positioning shafts (507) are symmetrically fixed with driving plates (508). The other end of the driving plates (508) is fixed to the clamping seat (511). The positioning module also includes a rotating part, which is used to drive the positioning ring (604) to rotate.

3. The process for repairing the neck of a finishing work roll according to claim 2, characterized in that, The positioning module also includes a support frame (5), in which a circular groove (501) is opened, and an adjustment ring (502) is rotatably arranged in the circular groove (501). Four sets of guide grooves (503) are arranged in a circumferential array on the adjustment ring (502). The guide grooves (503) are straight grooves that extend from the near center end to the far center end. A guide shaft (504) is slidably arranged in the guide groove (503). The guide shaft (504) is fixed to the positioning shaft (507) through a connecting plate.

4. The process for repairing the neck of a finishing work roll according to claim 3, characterized in that, The rotating part includes an arc-shaped rack (603) fixedly arranged on the outer edge of a drive ring (505) on one side, a first motor (509) fixedly arranged on one side of an adjusting ring (502), and a first gear (602) fixedly arranged at the output end of the first motor (509) for meshing with the arc-shaped rack (603).

5. The process for repairing the neck of a finishing work roll according to claim 4, characterized in that, A toothed ring (6) is fixedly arranged on one side of the adjusting ring (502); Among them, a second motor (510) is fixedly arranged on one side of the support frame (5), and a second gear (601) for meshing with the gear ring (6) is fixedly arranged at the output end of the second motor (510).

6. The process for repairing the neck of a finishing work roll according to claim 1, characterized in that, The welding gun mechanism includes a welding gun (207) installed in the insulation cylinder (2), and the other end of the welding gun (207) is connected to the flux delivery pipe (202); The welding gun mechanism also includes an adjustment unit, which is used to drive the welding gun (207) to move in the insulation cylinder (2) to correspond to the position to be repaired on the roller neck (401).

7. The finishing mill work roll neck repair process according to claim 6, characterized in that, The adjustment part includes a groove (204) opened on the heat preservation cylinder (2), and a sealing plate (203) is slidably arranged in the groove (204). The length of the sealing plate (203) is twice the length of the groove (204) along the axis of the heat preservation cylinder (2). A through hole for inserting the material conveying pipe (202) is opened in the middle position of the sealing plate (203). The material conveying pipe (202) is also slidably fitted with a limiting plate (201), which is connected to a motion module (216) that drives it to move along the axial direction of the insulation cylinder (2).

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