A fixture and its application method for laser infiltration treatment of the surface of high-speed steel rolls.

Abstract

This invention relates to the field of laser processing technology for rolls, specifically to a fixture and method for laser infiltration treatment of the surface of high-speed steel rolls. The fixture includes: a base plate, a movable frame slidably connected to the upper end of the base plate, electric push rods fixedly installed on both the left and right sides of the upper end of the movable frame, and a receiving plate connected to the upper end of the electric push rods via an arc-shaped plate; the receiving plate is arc-shaped, and several rollers are rotatably connected to the inner side of the upper end of the receiving plate; limit plates are detachably installed on both the left and right sides of the upper end of the receiving plate; the roll to be treated is placed on the upper end of the receiving plate, the electric push rods are activated to lift the roll, a second motor drives the rollers to rotate, adjusting the roll to the position to be treated at the top, and a third motor drives the movable block to move the laser processing head to the position to be treated, processing the roll. During the processing, a fourth motor drives the laser processing head to rotate, allowing for the processing of rolls of different specifications and different positions on the rolls.

Description

Technical Field

[0001] This invention relates to the field of laser processing technology for rolling mill rolls, specifically to a fixture and method for laser impregnation treatment of the surface of high-speed steel rolling mill rolls. Background Technology

[0002] Rolls are tools that induce plastic deformation in rolled metal and are crucial consumable components that determine the efficiency of rolling mills and the quality of rolled materials. Rolls are essential parts of rolling mills, utilizing the pressure generated by the rolling of one or more rolls to roll steel. They primarily bear the dynamic and static loads during rolling, as well as the effects of wear and temperature changes. During rolling, the working stress is extremely high, and they are also affected by inclusions and edge cracks in the workpiece, easily causing scratches, cracks, sticking, peeling, and even scrapping of the roll surface. Therefore, cold-rolled rolls require a surface with considerable hardness, toughness, and crack resistance. Cold-rolled rolls are typically forged from alloy steel and manufactured through complex heat treatment processes, resulting in very high production costs. Once the rolls reach their wear limit, the entire machine is scrapped, wasting resources and increasing the cost of purchasing rolls. Currently, common repair methods for rolls include induction hardening, thermal spraying, thermal spray welding, and laser cladding, among others.

[0003] Existing laser processing equipment for rolls is not convenient for processing rolls of different specifications, and the position of laser processing on the roll surface cannot be adjusted, resulting in significant limitations in its use. Summary of the Invention

[0004] The purpose of this invention is to provide a fixture and method for laser infiltration treatment of the surface of high-speed steel rolls, so as to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a fixture for laser infiltration treatment of the surface of high-speed steel rolls, comprising: a base plate, a movable frame slidably connected to the upper end of the base plate, electric push rods fixedly installed on both the left and right sides of the upper end of the movable frame, and a receiving plate connected to the upper end of the electric push rods through an arc plate;

[0006] The receiving plate is arc-shaped, and several rollers are rotatably connected to the inner side of the upper end of the receiving plate. Limiting plates are detachably installed on the left and right sides of the upper end of the receiving plate.

[0007] Side plates are fixedly installed on both the upper left and right sides of the base plate. A U-shaped frame is fixedly installed on the upper end of the side plate. A moving block is connected to the inner end of the U-shaped frame by a threaded rod. A mounting plate is installed on the lower end of the moving block by a cylinder. A laser processing head is rotatably connected to the side wall of the mounting plate.

[0008] Preferably, the upper left and right sides of the base plate are provided with sliding grooves, the lower left and right sides of the movable frame are provided with rollers, the lower ends of the rollers are located in the sliding grooves, the front and rear side walls of the base plate are fixedly installed with upright plates, and a threaded rod is rotatably connected between the two upright plates. The outer wall of the threaded rod is threadedly connected to the upper side wall of the movable frame, and a motor is fixedly installed on one side wall of one of the upright plates. The output end of the motor is fixedly connected to one end of the threaded rod.

[0009] Preferably, the lower end of the arc-shaped plate is fixedly installed on the upper end of the electric push rod. Arc-shaped grooves are opened on both the left and right sides of the lower end of the receiving plate, and the arc-shaped plate is located in the arc-shaped grooves. Several insertion holes are opened on the side walls of both the left and right ends of the receiving plate. Insertion rods are fixedly installed on the lower side walls of the front and rear ends of the limiting plate. Sliding holes are opened on the left and right sides of the lower end of the insertion rods. Stops are slidably connected to both ends of the sliding holes. The two stops are connected by a spring. Threaded holes are opened on the front and rear sides of the upper end of the limiting plate. The lower end of the threaded hole is connected to the sliding hole. A hand-tightening bolt is threaded into the threaded hole. The lower end of the hand-tightening bolt is located directly above the inner end of the two stops.

[0010] Preferably, a shaft is fixedly installed at one end of each roller, and a gear 1 is fixedly installed on the outer wall of the shaft located at the front and rear ends of the receiving plate. Two gears 2 are fixedly installed on the outer wall of the shaft located in the middle of the receiving plate. A chain is meshed on the outer walls of the two gears 1 and one of the gears 2. A motor 2 is fixedly installed on the lower side wall of the receiving plate, and a gear 3 is fixedly installed on the output end of the motor 2. The outer walls of the gear 3 and the gear 2 are meshed.

[0011] Preferably, a motor three is fixedly installed on one side wall of the U-shaped frame, and the output end of the motor three is fixedly connected to one end of the threaded rod two. A guide rod is also fixedly installed on the inner side wall of the U-shaped frame, and the guide rod is located on one side of the threaded rod two.

[0012] Preferably, the side wall of the movable block is provided with a threaded hole and a guide hole. The inner wall of the threaded hole is threadedly connected to the outer wall of the threaded rod, the inner wall of the guide hole is slidably connected to the outer wall of the guide rod, the lower side wall of the movable block is fixedly connected to one end of the cylinder, and the other end of the cylinder is fixedly connected to the upper end of the mounting plate.

[0013] Preferably, a bearing is fixedly installed on one side wall of the mounting plate, one end of the laser processing head passes through the bearing and is fixedly connected to the inner wall of the bearing, and a drive gear is fixedly installed on the outer wall of the laser processing head.

[0014] Preferably, a motor four is mounted on the lower side of one end of the mounting plate via a motor mounting plate, and a drive gear is fixedly mounted on the outer wall of the output end of the motor four.

[0015] Preferably, a round rod is rotatably connected to the lower side wall of the mounting plate, and driven gear one and driven gear two are fixedly installed on the round rod respectively. The outer wall of driven gear two is meshed with the outer wall of the driving gear, and the outer wall of driven gear one is meshed with the outer wall of the driving gear.

[0016] A method for using a fixture for laser infiltration treatment of the surface of high-speed steel rolls includes the following steps:

[0017] S1. First, according to the specifications of the roll to be processed, install two limiting plates on the upper end of the receiving plate;

[0018] S2. Then, place the roller to be processed on the upper end of the receiving plate and between the two limiting plates. Start motor 4 to move the roller to the lower end of the U-shaped frame. Then start electric push rod 8 to lift the roller and place it at the lower end of the laser processing head.

[0019] S3. Next, start the second motor to drive the roller to rotate, and adjust the roller to the position that needs to be processed to the top.

[0020] S4. Finally, the starting motor drives the moving block to move the laser processing head to the position that needs to be processed, and processes the roll. During the processing, the starting motor drives the laser processing head to rotate so as to process different positions of the roll.

[0021] Compared with the prior art, the beneficial effects of the present invention are:

[0022] Depending on the specifications of the rolls to be processed, two limiting plates are installed on the upper end of the receiving plate. The roll to be processed is placed on the upper end of the receiving plate, with both ends of the roll close to the inner sidewalls of the two limiting plates. Motor 1 is started to move the roll to the lower end of the U-shaped frame, and then the electric push rod is started to lift the roll. The electric push rod can lift rolls of different specifications to the lower end of the laser processing head. Motor 2 is started to drive the roller to rotate, adjusting the position of the roll to be processed to the upper position. Motor 3 is started to drive the moving block to move the laser processing head to the position to be processed, and the roll is processed. During the processing, Motor 4 is started to drive the laser processing head to rotate, so as to process rolls of different specifications and different positions of the rolls. Attached Figure Description

[0023] Figure 1 This is a front view of the overall structure of the present invention;

[0024] Figure 2 This is a bottom view of the overall structure of the present invention;

[0025] Figure 3 This is a schematic diagram of the receiving plate structure of the present invention;

[0026] Figure 4 This is a schematic diagram of the limiting plate structure of the present invention;

[0027] Figure 5 For the present invention Figure 2 Enlarged view of the structure of region A in the middle;

[0028] Figure 6 For the present invention Figure 3 Enlarged view of the structure of region B in the middle;

[0029] Figure 7 This is a schematic diagram of the U-shaped frame structure of the present invention;

[0030] Figure 8 This is a schematic diagram of the structure when the laser processing head of the present invention is installed.

[0031] In the diagram: 1. Base plate; 2. Slide groove; 3. Vertical plate; 4. Motor 1; 5. Threaded rod 1; 6. Moving frame; 7. Roller; 8. Electric push rod; 9. Arc plate; 10. Receiving plate; 11. Arc groove; 12. Roller; 13. Insertion hole; 14. Limiting plate; 15. Insertion rod; 16. Sliding hole; 17. Stop block; 18. Threaded hole; 19. Hand-tightening bolt; 20. Shaft; 21. Gear 1; 22. Gear 2; 23. Gear 3; 24. Motor 2; 25. Chain; 26. Side plate; 27. U-shaped frame; 28. Threaded rod 2; 29. ​​Motor 3; 30. Moving block; 31. Cylinder; 32. Mounting plate; 33. Laser processing head; 34. Motor 4; 35. Driving gear; 36. Driven gear 1; 37. Driven gear 2; 38. Drive gear. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of the present invention clear and complete, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only some, not all, embodiments of the present invention, and are merely illustrative of the embodiments of the present invention. They are not intended to limit 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.

[0033] In the description of this invention, it should be noted that the terms "center," "middle," "upper," "lower," "left," "right," "inner," "outer," "top," "bottom," "side," "vertical," and "horizontal," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "a," "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0034] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" 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 connection of 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] For purposes of simplicity and illustration, the principles of the embodiments are described primarily by way of example. In the following description, numerous specific details are set forth to provide a thorough understanding of the embodiments. However, it will be apparent to those skilled in the art that these embodiments may not be limited to these specific details in practice. In some instances, well-known methods and structures have not been described in detail to avoid unnecessarily obscuring these embodiments. Furthermore, all embodiments can be used in combination with each other.

[0036] Please see Figures 1 to 8This invention provides a technical solution: a fixture for laser infiltration treatment of the surface of high-speed steel rolls, comprising: a base plate 1, a movable frame 6 slidably connected to the upper end of the base plate 1, electric push rods 8 fixedly installed on both the left and right sides of the upper end of the movable frame 6, a receiving plate 10 connected to the upper end of the electric push rods 8 via an arc plate 9, the lower end of the arc plate 9 fixedly installed on the upper end of the electric push rods 8, arc grooves 11 formed on both the left and right sides of the lower end of the receiving plate 10, the arc plate 9 located within the arc grooves 11, and sliding grooves 2 formed on both the left and right sides of the upper end of the base plate 1. Rollers 7 are installed on both sides, and the lower end of the rollers 7 is located in the groove 2. Vertical plates 3 are fixedly installed on the side walls of the front and rear ends of the base plate 1. A threaded rod 5 is rotatably connected between the two vertical plates 3. The outer wall of the threaded rod 5 is threadedly connected to the upper side wall of the moving frame 6. A motor 4 is fixedly installed on one side wall of one of the vertical plates 3. The output end of the motor 4 is fixedly connected to one end of the threaded rod 5. Starting the motor 4 can drive the threaded rod 5 to rotate. The threaded rod 5 drives the moving frame 6 to move the receiving plate 10 and the rollers on the receiving plate 10.

[0037] The receiving plate 10 is arc-shaped. Several rollers 12 are rotatably connected to the inner side of the upper end of the receiving plate 10. Limiting plates 14 are detachably installed on the left and right sides of the upper end of the receiving plate 10. Several insertion holes 13 are opened on the side walls of both the left and right ends of the receiving plate 10. Insertion rods 15 are fixedly installed on the lower side walls of the front and rear ends of the limiting plate 14. Sliding holes 16 are opened on the left and right sides of the lower end of the insertion rods 15. Stops 17 are slidably connected to the left and right ends of the sliding holes 16. The two stops 17 are connected by a spring. Threaded holes 18 are opened on the front and rear sides of the upper end of the limiting plate 14. The lower end of the threaded holes 18 communicates with the sliding holes 16. A hand-tightening bolt 19 is internally threaded into the threaded hole 18. The lower end of the hand-tightening bolt 19 is located directly above the inner ends of the two stops 17. Springs are installed on the front and rear sides of the inner ends of the two stops 17. When the springs are in a balanced state, the two stops 17 are located inside the sliding hole 16. The lower end of the hand-tightening bolt 19 is conical and located between the two stops 17 and the two springs. The lower end of the plug rod 15 is passed through the plug hole 13. When the hand-tightening bolt 19 moves down, it is inserted between the two stops 17 and the two springs. The tension spring pushes the two stops 17 to the outside of the sliding hole 16 and contacts the lower side wall of the receiving plate 10, thus fixing the limiting plate 14.

[0038] Each roller 12 has a shaft 20 fixedly installed at one end. Gear 1 21 is fixedly installed on the outer wall of the shaft 20 located at the front and rear ends of the receiving plate 10. Two gears 22 are fixedly installed on the outer wall of the shaft 20 located in the middle of the receiving plate 10. Gear 22 is located at the lower end of gear 1 21, and the radius of gear 22 is larger than that of gear 1 21. Chains 25 are meshed and connected to the outer walls of both gears 1 21 and one of gears 22. Motor 24 is fixedly installed on the lower side wall of the receiving plate 10. Gear 3 23 is fixedly installed on the output end of motor 24. Gear 3 23 is meshed and connected to the outer walls of gear 22. By starting motor 24, motor 24 drives gear 3 23 to rotate, gear 3 23 drives gear 22 to rotate, and gear 22 drives gear 1 21 to rotate through the chain, thereby synchronously driving several rollers 12 to rotate, which facilitates the rotation of the rollers.

[0039] Side plates 26 are fixedly installed on both the left and right sides of the upper end of the base plate 1. A U-shaped frame 27 is fixedly installed on the upper end of the side plate 26. A moving block 30 is threadedly connected to the inner end of the U-shaped frame 27 through a threaded rod 28. A mounting plate 32 is installed on the lower end of the moving block 30 through a cylinder 31. A laser processing head 33 is rotatably connected to the side wall of the mounting plate 32.

[0040] The moving block 30 has a threaded hole and a guide hole on its side wall. The inner wall of the threaded hole is threadedly connected to the outer wall of the threaded rod 28. The inner wall of the guide hole is slidably connected to the outer wall of the guide rod. A motor 29 is fixedly installed on one side wall of the U-shaped frame 27. The output end of the motor 29 is fixedly connected to one end of the threaded rod 28. A guide rod is also fixedly installed on the inner side wall of the U-shaped frame 27. The guide rod is located on one side of the threaded rod 28. By starting the motor 29, the motor 29 drives the threaded rod 28 to rotate. The threaded rod 28 drives the moving block 30 to move the laser processing head 33.

[0041] The lower side wall of the moving block 30 is fixedly connected to one end of the cylinder 31, and the other end of the cylinder 31 is fixedly connected to the upper end of the mounting plate 32. A bearing is fixedly installed on one side wall of the mounting plate 32. One end of the laser processing head 33 passes through the bearing and is fixedly connected to the inner wall of the bearing. A drive gear 38 is fixedly installed on the outer wall of the laser processing head 33. A motor 34 is installed on the lower side of one end of the mounting plate 32 through a motor mounting plate. A drive gear 35 is fixedly installed on the outer wall of the output end of the motor 34. A round rod is rotatably connected to the lower side wall of the mounting plate 32. A driven gear 36 and a driven gear 37 are fixedly installed on the round rod respectively. The outer wall of the driven gear 37 meshes with the outer wall of the drive gear 35. The outer wall of the driven gear 36 meshes with the outer wall of the drive gear 38. The motor 34 drives the drive gear 35 to rotate. The drive gear 35 drives the driven gear 36 and the driven gear 37 to rotate. The driven gear 36 drives the drive gear 38 and the laser processing head 33 to rotate synchronously.

[0042] After the rolls are processed, the electric push rod 8 lowers the rolls and the motor 4 moves the frame 6 and the rolls back to their original positions, making it easier to load and unload the rolls.

[0043] When this device is in operation, according to the specifications of the roll to be processed, two limiting plates 14 are installed on the upper end of the receiving plate 10. The roll to be processed is placed on the upper end of the receiving plate 10, with both ends of the roll close to the inner sidewalls of the two limiting plates 14. The motor 1 4 is started to move the roll to the lower end of the U-shaped frame 27. Then the electric push rod 8 is started to lift the roll. The electric push rod 8 can lift rolls of different specifications to the lower end of the laser processing head 33. The motor 2 24 is started to drive the roller 12 to rotate the roll and adjust the position of the roll to be processed to the upper position. The motor 3 29 is started to drive the moving block 30 to move the laser processing head 33 to the position to be processed and process the roll. During the processing, the laser processing head 33 is driven to rotate by the motor 4 34 to process different positions of the roll. After the roll is processed, the electric push rod 8 lowers the roll and the motor 1 4 drives the moving frame 6 and the roll to reset, making it easy to pick up and put down the roll.

[0044] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A fixture for laser infiltration treatment of the surface of high-speed steel rolls, comprising: The base plate (1) has a sliding frame (6) slidably connected to its upper end. The feature is that electric push rods (8) are fixedly installed on both the left and right sides of the upper end of the sliding frame (6). The upper end of the electric push rods (8) is connected to a receiving plate (10) through an arc plate (9). Slide grooves (2) are opened on both the left and right sides of the upper end of the base plate (1). Rollers (7) are installed on both the left and right sides of the lower end of the sliding frame (6). The lower end of the rollers (7) is located in the slide groove (2). Vertical plates (3) are fixedly installed on the side walls of the front and rear ends of the base plate (1). A threaded rod (5) is rotatably connected between the two vertical plates (3). The outer wall of the threaded rod (5) is threadedly connected to the upper side wall of the sliding frame (6). A motor (4) is fixedly installed on one side wall of one of the vertical plates (3). The output end of the motor (4) is fixedly connected to one end of the threaded rod (5). The receiving plate (10) is arc-shaped. Several rollers (12) are rotatably connected to the inner side of the upper end of the receiving plate (10). Limiting plates (14) are detachably installed on the left and right sides of the upper end of the receiving plate (10). The lower end of the arc plate (9) is fixedly installed on the upper end of the electric push rod (8). Arc grooves (11) are opened on both the left and right sides of the lower end of the receiving plate (10). The arc plate (9) is located in the arc grooves (11). Several insertion holes (13) are opened on the side walls of the left and right ends of the receiving plate (10). The lower ends of the limiting plate (14) are connected to the lower ends of the receiving plate (10). A plug rod (15) is fixedly installed on each side wall. A sliding hole (16) is opened on the left and right sides of the lower end of the plug rod (15). A stop block (17) is slidably connected to both ends of the sliding hole (16). The two stops (17) are connected by a spring. A threaded hole (18) is opened on the front and rear sides of the upper end of the limiting plate (14). The lower end of the threaded hole (18) is connected to the sliding hole (16). A hand-tightening bolt (19) is threaded in the threaded hole (18). The lower end of the hand-tightening bolt (19) is located directly above the inner end of the two stops (17). Side plates (26) are fixedly installed on both the left and right sides of the upper end of the base plate (1). A U-shaped frame (27) is fixedly installed on the upper end of the side plate (26). A moving block (30) is threadedly connected to the inner end of the U-shaped frame (27) through a threaded rod (28). A mounting plate (32) is installed on the lower end of the moving block (30) through a cylinder (31). A laser processing head (33) is rotatably connected to the side wall of the mounting plate (32). A shaft (20) is fixedly installed at one end of each roller (12), located at the front and rear ends of the receiving plate (10). Gear 1 (21) is fixedly installed on the outer wall of the shaft (20) and two gears 2 (22) are fixedly installed on the outer wall of the shaft (20) located in the middle of the receiving plate (10). A chain (25) is meshed on the outer walls of the two gears 1 (21) and one of the gears 2 (22). Motor 2 (24) is fixedly installed on the lower side wall of the receiving plate (10). Gear 3 (23) is fixedly installed on the output end of motor 2 (24). Gear 3 (23) and gear 2 (22) are meshed on the outer walls.

2. The fixture for laser infiltration treatment of the surface of high-speed steel rolls according to claim 1, characterized in that: A motor three (29) is fixedly installed on one side wall of the U-shaped frame (27). The output end of the motor three (29) is fixedly connected to one end of the threaded rod two (28). A guide rod is also fixedly installed on the inner side wall of the U-shaped frame (27). The guide rod is located on one side of the threaded rod two (28).

3. The fixture for laser infiltration treatment of the surface of high-speed steel rolls according to claim 1, characterized in that: The moving block (30) has a threaded hole and a guide hole on its side wall. The inner wall of the threaded hole is threaded to the outer wall of the threaded rod (28). The inner wall of the guide hole is slidably connected to the outer wall of the guide rod. The lower side wall of the moving block (30) is fixedly connected to one end of the cylinder (31). The other end of the cylinder (31) is fixedly connected to the upper end of the mounting plate (32).

4. The fixture for laser infiltration treatment of the surface of high-speed steel rolls according to claim 1, characterized in that: A bearing is fixedly installed on one side wall of the mounting plate (32), one end of the laser processing head (33) passes through the bearing and is fixedly connected to the inner wall of the bearing, and a drive gear (38) is fixedly installed on the outer wall of the laser processing head (33).

5. A fixture for laser infiltration treatment of the surface of high-speed steel rolls according to claim 1, characterized in that: A motor four (34) is mounted on the lower side of one end of the mounting plate (32) via a motor mounting plate, and a drive gear (35) is fixedly mounted on the outer wall of the output end of the motor four (34).

6. A fixture for laser infiltration treatment of the surface of high-speed steel rolls according to claim 1, characterized in that: A round rod is rotatably connected to the lower side wall of the mounting plate (32). A driven gear one (36) and a driven gear two (37) are fixedly installed on the round rod. The outer wall of the driven gear two (37) meshes with the outer wall of the driving gear (35), and the outer wall of the driven gear one (36) meshes with the outer wall of the driving gear (38).

7. A method of using a fixture for laser infiltration treatment of the surface of high-speed steel rolls as described in claim 6, characterized in that: Specifically, the steps include the following: S1. First, according to the specifications of the roll to be processed, install two limiting plates (14) on the upper end of the receiving plate (10); S2. Then, place the roller to be processed on the upper end of the receiving plate (10) and between the two limiting plates (14). Start the motor (4) to move the roller to the lower end of the U-shaped frame (27). Then start the electric push rod (8) to lift the roller and place it at the lower end of the laser processing head (33). S3. Next, start motor two (24) to drive roller (12) to rotate and adjust the position of the roller to be processed to the top. S4. Finally, start motor three (29) drives moving block (30) to move laser processing head (33) to the position to be processed and process the roll. During the process, start motor four (34) drives laser processing head (33) to rotate so as to process different positions of the roll.

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