A perforator roll remanufacturing tooling and process method

Abstract

The present invention discloses a remanufacturing tooling and process method for a piercing mill roll. The tooling includes a universal main shaft arranged in the inner hole of the piercing mill roll. At least two cross-shaped supporting rings are sleeved on the universal main shaft. A main cross beam is arranged on the side of the roller frame. Y-axis cross beams are fixedly arranged at both ends of the main cross beam along the Y-axis direction. An X-axis cross beam is fixedly arranged between the two Y-axis cross beams along the X-axis direction. A Y-axis moving trolley and an X-axis moving trolley are respectively slidably arranged on the Y-axis cross beam and the X-axis cross beam. A Y-axis laser distance measuring probe and an X-axis laser distance measuring probe are respectively fixedly arranged below the Y-axis moving trolley and the X-axis moving trolley. A gas pipe support bracket with the same inclined surface as that of the piercing mill roll is arranged below the piercing mill roll. A plurality of gas heating pipes are evenly arranged above the gas pipe support bracket. The present invention solves the problems of difficult fixation of the piercing mill roll, inaccurate measurement of the roll body size, and excessive temperature drop between layers, etc.

Description

Technical Field

[0001] The present invention relates to the field of roll remanufacturing, and in particular to a piercing mill roll remanufacturing tooling and process method. Background Art

[0002] The piercing mill roll is an important part of seamless steel pipe production. Especially, the oblique piercing process is the most widely used at present. The structure of the piercing mill roll is generally a conical hollow structure, which is generally processed by forging technology. Due to the special structure, the processing difficulty is large. Therefore, the hardness performance of the steel itself is low. During the rolling process, the wear amount of the product is large, and the room for improving the rolling amount is limited. By means of cyclic remanufacturing, improving the surface quality of the piercing mill roll and enhancing the wear resistance of the working layer have good market prospects. At present, the following problems exist in the remanufacturing of the piercing mill roll:

[0003] (1) The piercing mill roll is generally a hollow conical roll structure, and there is no position to support it for welding. Therefore, it is necessary to make tooling to realize the function of supporting the roll. Because there are many size specifications of the piercing mill roll, it is more cumbersome to make tooling independently each time;

[0004] (2) The piercing mill roll belongs to the welding of special-shaped rolls. Due to the large diameter deviation between the large end and the small end, the size measurement work is more difficult than that of traditional flat rolls. It is difficult to ensure the consistency of the cladding thickness of each layer during the welding process. Therefore, the size measurement work is crucial for controlling the cladding welding amount. Measuring the diameter of the special-shaped roll at high temperature is extremely inconvenient whether using a disc or a π gauge. The diameter size deviation may exceed 20 mm, which may cause great cost waste;

[0005] (3) Due to the special structure of the piercing mill roll, the diameter deviation between the large end and the small end is more than 1.5 meters. Due to the inconsistency of the structure, the interlayer temperature control of the piercing mill roll leads to uneven heat conduction process, and the interlayer temperature drop exceeds 30°C. There are unstable factors in the product performance. Due to the inconsistency of the product performance, the wear degree of some areas is inconsistent, resulting in a large deviation of the product roll shape. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a piercing mill roll remanufacturing tooling and process method, which realizes the fixation of the piercing mill roll with an internal control diameter of 500 - 1200 mm only through a simple roll shaft and a cross-shaped tooling, and solves the problems such as difficult fixation of the piercing mill roll, inaccurate measurement of the roll body size, and excessive interlayer temperature drop.

[0007] To solve the above technical problems, the technical solution adopted by the present invention is as follows: A remanufacturing tooling for a piercing mill roll includes a universal main shaft disposed in the inner hole of the piercing mill roll. At least two cross-shaped supporting rings that abut against the inner hole wall of the piercing mill roll are sleeved on the universal main shaft. Both ends of the universal main shaft are disposed on a roller stand. A main cross beam is disposed on the side of the roller stand. Y-axis cross beams are fixedly disposed at both ends of the main cross beam along the Y-axis direction. An X-axis cross beam is fixedly disposed between the two Y-axis cross beams above the piercing mill roll along the X-axis direction. A Y-axis moving trolley and an X-axis moving trolley are respectively slidably disposed on the Y-axis cross beam and the X-axis cross beam. The Y-axis moving trolley and the X-axis moving trolley are respectively controlled to move by a Y-axis servo motor and an X-axis servo motor. A Y-axis laser distance measuring probe and an X-axis laser distance measuring probe are respectively fixedly disposed below the Y-axis moving trolley and the X-axis moving trolley. The Y-axis servo motor, the X-axis servo motor, the Y-axis laser distance measuring probe, and the X-axis laser distance measuring probe are all electrically connected to a data collector. A gas pipe bracket with the same inclined surface as the piercing mill roll is disposed below the piercing mill roll. A plurality of gas heating pipes are evenly disposed above the gas pipe bracket. An infrared thermometer is correspondingly disposed for each gas heating pipe directly above the piercing mill roll. The data collector and the infrared thermometer display the collected data on a computer display screen.

[0008] A further improvement of the technical solution of the present invention lies in that: The cross-shaped supporting ring includes an inner cylindrical ring sleeved on the universal main shaft and an outer cylindrical ring sleeved on the outside of the inner cylindrical ring. 8 supporting liners are evenly and fixedly disposed between the inner cylindrical ring and the outer cylindrical ring.

[0009] A further improvement of the technical solution of the present invention lies in that: Threaded through holes are disposed on the inner cylindrical ring and the outer cylindrical ring between every two adjacent supporting liners. A fastening bolt for the inner hole of the piercing mill roll is threadedly connected to the threaded through hole on the outer cylindrical ring, and a fastening bolt for the universal main shaft is threadedly connected to the threaded through hole on the inner cylindrical ring.

[0010] A further improvement of the technical solution of the present invention lies in that: A reinforcing cross beam is disposed between the main cross beam and the Y-axis cross beam.

[0011] A further improvement of the technical solution of the present invention lies in that: The gas heating pipe includes a gas pipe and a gas flow regulating device disposed at the gas outlet of the gas pipe to control the gas flow rate. The gas flow regulating device includes a gas hole adjusting knob and a gas hole baffle. A moving gear slide rail is disposed on the gas hole baffle, and a gear meshing and rotating with the moving gear slide rail is disposed on the gas hole adjusting knob.

[0012] A further improvement of the technical solution of the present invention lies in that: A process method for remanufacturing a piercing mill roll includes the following steps:

[0013] Step S1. Fix the piercing mill roll: Select at least two cross-shaped support rings according to the inner hole size of the piercing mill roll and sleeve them on the universal main shaft.

[0014] Step S2. Calibrate the coaxiality of the piercing mill roll: Place the piercing mill roll horizontally, insert the universal main shaft with the cross-shaped support rings installed into the inside of the piercing mill roll, and tighten the fastening bolts for the inner hole of the piercing mill roll and the fastening bolts for the universal main shaft.

[0015] Step S3. Surfacing of the piercing mill roll: After selecting appropriate welding materials, deposit the roll by spiral welding with a welding power source to the corresponding size.

[0016] Step S4. Measurement of the size of the piercing mill roll: The X-axis moving trolley moves along the X-axis of the reference Y-base from the end face of the smallest end of the piercing mill roll, takes a Z value every 5 mm, and uses multiple groups of data as the data set M1.

[0017] Step S5. Rotate the piercing mill roll 90°, 180°, and 270° in sequence, and repeat Step S4 respectively to obtain data sets M2, M3, and M4 respectively.

[0018] Step S6. Establish a three-dimensional model of the piercing mill roll with the above measurement data through 3D modeling and compare it with the three-dimensional model of the finished product size of the piercing mill roll to verify whether the measured size meets the actual requirements.

[0019] The further improvement of the technical solution of the present invention lies in: The specific steps for calibrating the coaxiality of the piercing mill roll in Step S2 are as follows:

[0020] Step S21. Ensure that the protrusion distance deviation of each fastening bolt for the inner hole of the piercing mill roll in the cross-shaped support ring and the protrusion distance deviation of each fastening bolt for the universal main shaft in the cross-shaped support ring are both less than 2 mm by measuring with a ruler.

[0021] Step S22. The Y-axis moving trolley finds one place on each side of the universal main shaft and moves along the Y-axis respectively. The Y-axis laser distance measuring probes measure the positions with the smallest Z-axis at the two places respectively, and are recorded as

[0022] A(x1, y1, z1) and B(x2, y2, z2);

[0023] Step S23. Calculate whether the following formulas simultaneously satisfy the deviation:

[0024] |y1 - y2| ≤ 2 mm;

[0025] |z1 - z2| ≤ 2 mm;

[0026] Step S24. If the formulas in Step S23 simultaneously satisfy the deviation, then continue with Step S25. If not, readjust the position of the piercing mill roll and continue with Step S22.

[0027] Step S25: Determine the reference Y base of the perforating machine roll: y0 = (y1 + y2) / 2;

[0028] Step S26: The X-axis moving trolley moves along the X-axis of the reference Y base. The X-axis laser ranging probe measures the positions with the minimum Z-axis at the large diameter end and the small diameter end of the perforating machine roll respectively, and they are recorded as C(x3, y3, z3) and D(x4, y4, z4);

[0029] Step S27: Calculate whether the following formula satisfies the deviation:

[0030] |y3 - y0| ≤ 2mm;

[0031] |y4 - y0| ≤ 2mm;

[0032] Step S28: If the formulas in Step S27 all satisfy the deviation, there is no need to adjust the fastening bolts of the inner hole of the perforating machine roll and the fastening bolts of the universal spindle. If the formulas in Step S27 do not satisfy the deviation, when y3 or y4 is less than y0, loosen the fastening bolts of the inner hole of the perforating machine roll or the fastening bolts of the universal spindle. When y3 or y4 is greater than y0, tighten the fastening bolts of the inner hole of the perforating machine roll or the fastening bolts of the universal spindle until the error satisfies Step S27;

[0033] Step S29: Rotate the perforating machine roll 90°, 180° and 270° in sequence, and repeat Steps S21 - S28 respectively to complete the coaxiality calibration work of the perforating machine roll.

[0034] A further improvement of the technical solution of the present invention is that in Step S3, a low-carbon high-chromium alloy welding material is used to weld the perforating machine roll. The chemical composition of the low-carbon high-chromium alloy welding material is C: 0.36 - 0.44%; Mn: 0.70 - 1.00%; Si: 0.017 - 0.37%; P ≤ 0.03%; S ≤ 0.03%; Cr: 0.70 - 0.90%; Mo: 0.25 - 0.35%; Ni ≤ 0.35%. The tensile strength of the low-carbon high-chromium alloy welding material > 1000 MPa, the yield strength > 550 MPa, and the impact force is 80 J.

[0035] A further improvement of the technical solution of the present invention is that in Step S3, during the surfacing process of the perforating machine roll, check the temperature values of the perforating machine roll fed back by each infrared thermometer every hour. If the difference between two adjacent temperature values is greater than 30°C, manually adjust the air regulating device at the lower temperature of the perforating machine roll for supplementary heating.

[0036] Due to the adoption of the above technical solution, the technical progress achieved by the present invention is:

[0037] 1. The present invention realizes the fixation of the piercing mill rolls with an internal control diameter of 500 - 1200 mm only through a simple cross-shaped support ring, which basically covers the piercing mill rolls on the market and eliminates the need to prepare different toolings for rolls of different hole types.

[0038] 2. By making the positioning and distance measurement functions of the remanufacturing tooling for the piercing mill rolls and assisting with 3D modeling technology, the present invention realizes the fixation of the piercing mill rolls, the detection of coaxiality, and the measurement of roll body dimensions.

[0039] 3. The present invention uses welding materials that match the piercing mill rolls, which have good weldability and little impact on the overall performance of the product. Additionally, multiple gas heating tubes are provided, and the size of the air holes can be changed through an air regulating device to vary the amount of supplementary heat energy. After normal adjustment, the interlayer temperature can be basically controlled within 30°C, and the Shore hardness drop can be controlled within 3 degrees. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is the front view of the overall structure of the present invention;

[0041] Figure 2 is the side view of the overall structure of the present invention;

[0042] Figure 3 is Figure 2 the enlarged schematic diagram of the structure of the gas heating tube in

[0043] Figure 4 is the three-dimensional diagram of the cross-shaped support ring;

[0044] Among them, 1. Piercing mill roll, 2. Universal main shaft, 3. Cross-shaped support ring, 3-1. Inner cylindrical ring, 3-2. Outer cylindrical ring, 4. Roller frame, 5. Main crossbeam, 6. Y-axis crossbeam, 7. X-axis crossbeam, 8. Y-axis moving trolley, 9. X-axis moving trolley, 10. Y-axis laser distance measuring probe, 11. X-axis laser distance measuring probe, 12. Gas pipe bracket, 13. Gas heating tube, 13-1. Gas pipe, 13-2. Air hole adjustment knob, 13-3. Air hole baffle, 13-4. Moving gear slide rail, 14. Piercing mill roll inner hole fastening bolt, 15. Universal main shaft fastening bolt, 16. Reinforcing crossbeam. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0045] The following further describes the present invention in detail with reference to the embodiments:

[0046] As Figures 1 to 4As shown in the figure, a remanufacturing tooling for a piercing mill roll includes a universal spindle 2 disposed in the inner hole of the piercing mill roll 1. At least two cross-shaped support rings 3 that abut against the inner hole wall of the piercing mill roll 1 are sleeved on the universal spindle 2. The cross-shaped support ring 3 includes an inner cylindrical ring 3-1 sleeved on the universal spindle 2 and an outer cylindrical ring 3-2 sleeved on the outer side of the inner cylindrical ring 3-1. Eight support liners 3-3 are uniformly and fixedly arranged between the inner cylindrical ring 3-1 and the outer cylindrical ring 3-2. Threaded through holes are provided on the inner cylindrical ring 3-1 and the outer cylindrical ring 3-2 between every two adjacent support liners 3-3. A fastening bolt 14 for the inner hole of the piercing mill roll is threadedly connected to the threaded through hole on the outer cylindrical ring 3-2, and a fastening bolt 15 for the universal spindle is threadedly connected to the threaded through hole on the inner cylindrical ring 3-1. The fastening bolts 14 for the inner hole of the piercing mill roll and the fastening bolts 15 for the universal spindle are generally bolts above M50, and the length is adjusted according to needs. When in use, it must be ensured that the lengths of all the fastening bolts 14 for the inner hole of the piercing mill roll are the same and the lengths of all the fastening bolts 15 for the universal spindle are the same.

[0047] Both ends of the universal spindle 2 are disposed on a roller stand 4. A main cross beam 5 is provided on the side of the roller stand 4. Y-axis cross beams 6 are fixedly arranged at both ends of the main cross beam 5 along the Y-axis direction. A reinforcing cross beam 16 is provided between the main cross beam 5 and the Y-axis cross beams 6. An X-axis cross beam 7 is fixedly arranged between the two Y-axis cross beams 6 above the piercing mill roll 1 along the X-axis direction. A Y-axis moving trolley 8 and an X-axis moving trolley 9 are respectively slidably arranged on the Y-axis cross beam 6 and the X-axis cross beam 7. The Y-axis moving trolley 8 and the X-axis moving trolley 9 are respectively controlled to move by a Y-axis servo motor and an X-axis servo motor. Y-axis laser distance measuring probes 10 and X-axis laser distance measuring probes 11 are respectively fixedly arranged below the Y-axis moving trolley 8 and the X-axis moving trolley 9. The Y-axis servo motor, the X-axis servo motor, the Y-axis laser distance measuring probe 10, and the X-axis laser distance measuring probe 11 are all electrically connected to a data collector. A gas pipe support bracket 12 with the same inclined surface as the piercing mill roll 1 is provided below the piercing mill roll 1. A plurality of gas heating pipes 13 are uniformly arranged above the gas pipe support bracket 12. The gas heating pipe 13 includes a gas pipe 13-1 and a gas flow regulating device provided at the gas outlet of the gas pipe 13-1. The gas flow regulating device includes a gas hole adjusting knob 13-2 and a gas hole baffle 13-3. A moving gear slide rail 13-4 is provided on the gas hole baffle 13-3. A gear meshing and rotating with the moving gear slide rail 13-4 is provided on the gas hole adjusting knob 13-2. An infrared thermometer is correspondingly arranged for each gas heating pipe 13 directly above the piercing mill roll 1. The data collected by the data collector and the infrared thermometer are displayed on a computer display screen.

[0048] A process method for remanufacturing a piercing mill roll is characterized by including the following steps:

[0049] Step S1. Fix the piercing mill roll 1: Select at least two cross-shaped supporting rings 3 according to the inner hole size of the piercing mill roll 1 and sleeved them on the universal main shaft 2.

[0050] Step S2. Calibrate the coaxiality of the piercing mill roll 1: Place the piercing mill roll 1 horizontally, insert the universal main shaft with the installed cross-shaped supporting rings 3 into the inside of the piercing mill roll 1, and tighten the fastening bolts 14 for the inner hole of the piercing mill roll and the fastening bolts 15 for the universal main shaft. The specific steps for calibrating the coaxiality of the piercing mill roll 1 are as follows:

[0051] Step S21. Ensure that the protruding distance deviation of each fastening bolt 14 for the inner hole of the piercing mill roll within the cross-shaped supporting ring 3 and the protruding distance deviation of each fastening bolt for the universal main shaft within the cross-shaped supporting ring 3 are both less than 2 mm by measuring with a ruler.

[0052] Step S22. The Y-axis moving trolley 8 moves along the Y-axis respectively at two places on both sides of the universal main shaft 2, and the Y-axis laser distance measuring probes 10 measure the positions with the minimum Z-axis at the two places respectively, which are recorded as A(x1, y1, z1) and B(x2, y2, z2).

[0053] Step S23. Calculate whether the following formulas simultaneously satisfy the deviation:

[0054] |y1 - y2| ≤ 2 mm;

[0055] |z1 - z2| ≤ 2 mm;

[0056] Step S24. If the formulas in Step S23 simultaneously satisfy the deviation, then proceed to Step S25. If not, readjust the position of the piercing mill roll 1 and continue with Step S22.

[0057] Step S25. Determine the reference Y base of the piercing mill roll 1: y0 = (y1 + y2) / 2;

[0058] Step S26. The X-axis moving trolley 9 moves along the X-axis of the reference Y base, and the X-axis laser distance measuring probes 11 measure the positions with the minimum Z-axis at the large diameter end and the small diameter end of the piercing mill roll 1 respectively, which are recorded as C(x3, y3, z3) and D(x4, y4, z4).

[0059] Step S27. Calculate whether the following formula satisfies the deviation:

[0060] |y3 - y0| ≤ 2 mm;

[0061] |y4 - y0| ≤ 2 mm;

[0062] Step S28: If the formulas in step S27 all meet the deviation, there is no need to adjust the fastening bolts 14 of the inner hole of the piercing mill roll and the fastening bolt 15 of the general spindle. If the formulas in step S27 do not meet the deviation, when y3 or y4 is less than y0, loosen the fastening bolt 14 of the inner hole of the piercing mill roll or the fastening bolt 15 of the general spindle. When y3 or y4 is greater than y0, tighten the fastening bolt 14 of the inner hole of the piercing mill roll or the fastening bolt 15 of the general spindle until the error meets step S27;

[0063] Step S29: Rotate the piercing mill roll 1 by 90°, 180° and 270° in sequence, and repeat steps S21 - S28 respectively to complete the coaxiality calibration work of the piercing mill roll 1.

[0064] Step S3: Surfacing of the piercing mill roll: Weld the piercing mill roll 1 with a low - carbon high - chromium alloy welding material, and deposit the roll to the corresponding size by the spiral welding method of the welding power source; the chemical composition of the low - carbon high - chromium alloy welding material is C: 0.36 - 0.44%; Mn: 0.70 - 1.00%; Si: 0.017 - 0.37%; P ≤ 0.03%; S ≤ 0.03%; Cr: 0.70 - 0.90%; Mo: 0.25 - 0.35%; Ni ≤ 0.35%. The tensile strength of the low - carbon high - chromium alloy welding material > 1000 MPa, yield strength > 550 MPa, and impact force is 80 J. Through the adjustment of low - carbon and alloying elements, while ensuring good mechanical properties, it has the characteristics of poor thermal sensitivity, excellent welding performance, especially stable wear resistance and hardness indexes, making the surface quality of the seamless steel pipe rolled by the piercing mill roll 1 excellent.

[0065] During the surfacing process of the piercing mill roll, check the temperature value of the piercing mill roll 1 fed back by each infrared thermometer every hour. If the difference between two adjacent temperature values is greater than 30 °C, manually adjust the air - regulating device at the lower - temperature part of the piercing mill roll 1 for supplementary heating.

[0066] Step S4: Dimension measurement of the piercing mill roll 1: The X - axis moving trolley 9 moves along the X - axis of the reference Y - base from the smallest - end face of the piercing mill roll 1, takes a Z - value every 5 mm, and takes multiple groups of data as the data set M1;

[0067] Step S5: Rotate the piercing mill roll 1 by 90°, 180° and 270° in sequence, and repeat step S4 respectively to obtain data sets M2, M3, and M4;

[0068] Step S6: Establish a three - dimensional model of the piercing mill roll 1 with the above - measured data through 3D modeling and compare it with the three - dimensional model of the finished product size of the piercing mill roll 1 to verify whether the measured dimensions meet the actual requirements.

[0069] The present invention realizes the fixation of the piercing mill rolls with an internal control diameter of 500 - 1200 mm only through simple roller shafts and a cross-shaped tooling, solving problems such as difficult fixation of the piercing mill rolls, inaccurate measurement of the roll body size, and excessive temperature drop between layers.

Claims

1. A remanufacturing tooling for a perforator roll, characterized in that: It includes a universal spindle (2) arranged in the inner hole of a piercing mill roll (1). At least two cross-shaped support rings (3) that abut against the inner hole wall of the piercing mill roll (1) are sleeved on the universal spindle (2). The cross-shaped support ring (3) includes an inner cylindrical ring (3-1) sleeved on the universal spindle (2) and an outer cylindrical ring (3-2) sleeved on the outside of the inner cylindrical ring (3-1). Eight support liners (3-3) are evenly and fixedly arranged between the inner cylindrical ring (3-1) and the outer cylindrical ring (3-2). Threaded through holes are provided on the inner cylindrical ring (3-1) and the outer cylindrical ring (3-2) between every two adjacent support liners (3-3). A fastening bolt (14) for the inner hole of the piercing mill roll is threadedly connected to the threaded through hole on the outer cylindrical ring (3-2), and a fastening bolt (15) for the universal spindle is threadedly connected to the threaded through hole on the inner cylindrical ring (3-1). Both ends of the universal spindle (2) are arranged on a roller stand (4). A main cross beam (5) is arranged on the side of the roller stand (4). Y-axis cross beams (6) are fixedly arranged at both ends of the main cross beam (5) along the Y-axis direction. An X-axis cross beam (7) is fixedly arranged between the two Y-axis cross beams (6) above the piercing mill roll (1) along the X-axis direction. A Y-axis moving trolley (8) and an X-axis moving trolley (9) are respectively slidably arranged on the Y-axis cross beam (6) and the X-axis cross beam (7). The Y-axis moving trolley (8) and the X-axis moving trolley (9) are respectively controlled to move by a Y-axis servo motor and an X-axis servo motor. Y-axis laser distance measuring probes (10) and X-axis laser distance measuring probes (11) are respectively fixedly arranged below the Y-axis moving trolley (8) and the X-axis moving trolley (9). The Y-axis servo motor, the X-axis servo motor, the Y-axis laser distance measuring probe (10), and the X-axis laser distance measuring probe (11) are all electrically connected to a data collector. A gas pipe support bracket (12) with the same inclined surface as the piercing mill roll (1) is arranged below the piercing mill roll (1). A plurality of gas heating pipes (13) are evenly arranged above the gas pipe support bracket (12). An infrared thermometer is correspondingly arranged for each gas heating pipe (13) directly above the piercing mill roll (1). The data collected by the data collector and the infrared thermometer are displayed on a computer display screen.

2. The remanufacturing tooling for a perforator roll according to claim 1, characterized in that: A reinforcing cross beam (16) is arranged between the main cross beam (5) and the Y-axis cross beam (6).

3. The remanufacturing tooling for the perforator roll according to claim 1, characterized in that: The gas heating pipe (13) includes a gas pipe (13-1) and a gas flow regulating device arranged at the gas outlet of the gas pipe (13-1). The gas flow regulating device includes a gas hole adjusting knob (13-2) and a gas hole baffle (13-3). A moving gear slide rail (13-4) is arranged on the gas hole baffle (13-3), and a gear meshing and rotating with the moving gear slide rail (13-4) is arranged on the gas hole adjusting knob (13-2).

4. A process method for remanufacturing a perforating machine roll, characterized in that: Adopt the remanufacturing tooling for the piercing mill roll as described in any one of claims 1 to 3. The process method specifically includes the following steps: Step S1, fix the piercing mill roll (1): Select at least two cross-shaped support rings (3) according to the inner hole size of the piercing mill roll (1) and sleeve them on the universal spindle (2); Step S2. Calibrate the coaxiality of the piercing mill roll (1): Place the piercing mill roll (1) horizontally, insert the universal main shaft with the installed cross-shaped support ring (3) into the interior of the piercing mill roll (1), and tighten the inner hole fastening bolts (14) and the universal main shaft fastening bolts (15) of the piercing mill roll; Step S3. Surfacing of the piercing mill roll: After selecting appropriate welding materials, deposit the roll onto the corresponding dimensions by means of spiral welding with a welding power source; Step S4. Dimension measurement of the piercing mill roll (1): The X-axis moving trolley (9) moves along the X-axis of the reference Y-base from the smallest end face of the piercing mill roll (1), takes a Z value every 5 mm, and uses multiple groups of data as the data set M1; Step S5. Rotate the piercing mill roll (1) by 90°, 180°, and 270° in sequence, and repeat Step S4 respectively to obtain data sets M2, M3, and M4 respectively; Step S6. Use the above data to establish a 3D model of the piercing mill roll (1) through 3D modeling and compare it with the 3D model of the finished product dimensions of the piercing mill roll (1) to verify whether the measured dimensions meet the actual requirements.

5. A process method for remanufacturing a perforator roll according to claim 4, characterized in that: The specific steps for calibrating the coaxiality of the piercing mill roll (1) in Step S2 are as follows: Step S21. Ensure that the protrusion distance deviation of each inner hole fastening bolt (14) of the piercing mill roll within the cross-shaped support ring (3) and the protrusion distance deviation of each universal main shaft fastening bolt within the cross-shaped support ring (3) are both less than 2 mm by measuring with a ruler; Step S22. The Y-axis moving trolley (8) moves along the Y-axis at two locations on both sides of the universal main shaft (2) respectively, and the Y-axis laser distance measuring probe (10) measures the two positions with the smallest Z-axis respectively, denoted as A(x1, y1, z1) and B(x2, y2, z2); Step S23. Calculate whether the following formulas simultaneously satisfy the deviation: |y1 - y2| ≤ 2 mm; |z1 - z2| ≤ 2 mm; Step S24. If the formulas in Step S23 simultaneously satisfy the deviation, proceed to Step S25; if not, readjust the position of the piercing mill roll (1) and continue with Step S22; Step S25. Determine the reference Y-base of the piercing mill roll (1): y0 = (y1 + y2) / 2; Step S26. The X-axis moving trolley (9) moves along the X-axis of the reference Y-base, and the X-axis laser distance measuring probe (x11) measures the two positions with the smallest Z-axis at the large diameter end and the small diameter end of the piercing mill roll (1) respectively, denoted as C(x3, y3, z3) and D(x4, y4, z4); Step S27. Calculate whether the following formulas satisfy the deviation: |y3 - y0| ≤ 2 mm; |y4 - y0| ≤ 2 mm; Step S28. If the formulas in Step S27 all satisfy the deviation, there is no need to adjust the inner hole fastening bolts (14) and the universal main shaft fastening bolts (15) of the piercing mill roll; if the formulas in Step S27 do not satisfy the deviation, when y3 or y4 is less than y0, loosen the inner hole fastening bolt (14) or the universal main shaft fastening bolt (15) of the piercing mill roll; when y3 or y4 is greater than y0, tighten the inner hole fastening bolt (14) or the universal main shaft fastening bolt (15) of the piercing mill roll until the error meets Step S27; Step S29: Rotate the perforator roll (1) by 90°, 180°, and 270° in sequence, and repeat steps S21 - S28 respectively to complete the coaxiality calibration of the perforator roll (1).

6. A process method for remanufacturing a perforator roll according to claim 4, characterized in that: In step S3, a low-carbon high-chromium alloy welding material is used to weld the perforator roll (1). The chemical composition of the low-carbon high-chromium alloy welding material is: C: 0.36 - 0.44%; Mn: 0.70 - 1.00%; Si: 0.017 - 0.37%; P ≤ 0.03%; S ≤ 0.03%; Cr: 0.70 - 0.90%; Mo: 0.25 - 0.35%; Ni ≤ 0.35%. The tensile strength of the low-carbon high-chromium alloy welding material is > 1000 MPa, the yield strength is > 550 MPa, and the impact strength is 80 J.

7. A process method for remanufacturing a perforating machine roll according to claim 4, characterized in that: In step S3, during the surfacing process of the perforator roll, check the temperature values of the perforator roll (1) fed back by each infrared thermometer every hour. If the difference between two adjacent temperature values is greater than 30 °C, manually adjust the air regulating device at the lower temperature of the perforator roll (1) for supplementary heating.

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