Cylindrical part arc chamfering and rolling machine tool and process

Abstract

The application discloses a cylindrical part circular-arc chamfering and rolling machine tool and a process, relates to the technical field of circular-arc chamfering and rolling, and comprises a bed body and chuck mechanisms, a lifting tool rest mechanism, a centering sliding mechanism and an electric control cabinet arranged on the bed body; one end of a workpiece is clamped to the chuck mechanisms, and the other end is rotationally supported on the centering sliding mechanism; the lifting tool rest mechanism is slidably arranged on the bed body along the axial direction of the workpiece; a tool bar is movably connected to the lifting tool rest mechanism; at least two rolling wheels are rotationally arranged on the tool bar; three-dimensional rolling strips are protrusively arranged on the contact surface of one rolling wheel; the rolling wheel can be attached to the circular-arc chamfer of the workpiece; and the chuck mechanisms and the lifting tool rest mechanism are in communication connection with the electric control cabinet. The rolling strips can reduce the contact area between the rolling wheel and the circular-arc chamfer, and can simultaneously generate a reciprocating feeding motion along the axial direction of the cylindrical part in the circular-arc chamfer, so that the plastic deformation during rolling and the residual compressive stress at the circular-arc chamfer are increased, and the service life of the cylindrical part is improved.

Description

Technical Field

[0001] This invention relates to the technical field of arc chamfering rolling, and in particular to an arc chamfering rolling machine tool and process for cylindrical parts. Background Technology

[0002] Cylindrical components, as key transmission parts in special vehicles, often feature rounded chamfers on the outer and inner walls of their sleeve structures to mate with other parts on the vehicle body. During operation, these components are frequently subjected to alternating load impacts, making the rounded chamfers prone to creep and tensile / compressive deformation. This can lead to microcracks and ultimately fatigue fracture at the chamfer, preventing the vehicle from starting and seriously threatening the safety of passengers.

[0003] Deep rolling strengthening of the inner and outer chamfers of cylindrical parts can increase the residual compressive stress at the chamfer, thereby improving the tensile and compressive strength of the chamfer. However, due to the inherent characteristics of the chamfer, ordinary deep rolling strengthening devices merely roll along a groove with the same chamfer radius, failing to feed axially to generate significant plastic extrusion deformation, thus failing to produce substantial residual compressive stress. Furthermore, this rolling method tends to distribute loads across the chamfer profile, resulting in a large contact area and thus a less pronounced rolling strengthening effect. Summary of the Invention

[0004] The purpose of this invention is to provide a rolling mill and process for rounding the chamfer of cylindrical parts, so as to solve the problems existing in the prior art, increase the extrusion plastic deformation of the rolling roller and the rounded chamfer, generate greater residual compressive stress on the rounded chamfer, and improve the service life of cylindrical parts.

[0005] To achieve the above objectives, the present invention provides the following solution:

[0006] This invention provides a rolling mill for rounding the bevel of cylindrical parts, including a bed and a chuck mechanism, a lifting tool post mechanism, a centering sliding mechanism, and an electrical control cabinet mounted on the bed. One end of the workpiece is clamped to the chuck mechanism, and the other end is rotatably supported on the centering sliding mechanism. The lifting tool post mechanism is slidably mounted on the bed along the axial direction of the workpiece. A tool holder is movably connected to the lifting tool post mechanism, and at least two types of rolling rollers are rotatably mounted on the tool holder. One of the rolling rollers has a three-dimensional rolling strip protruding from its contact surface. The rolling roller can fit against the rounded bevel of the workpiece. The chuck mechanism and the lifting tool post mechanism are communicatively connected to the electrical control cabinet.

[0007] Preferably, the chuck mechanism includes a three-jaw chuck and a motor, wherein the chuck of the three-jaw chuck is connected to the rotating shaft of the motor.

[0008] Preferably, the lifting tool post mechanism includes a slide box, a lifting mechanism, and a tool post. The slide box is slidably mounted on the bed via a ball screw mechanism, which is connected to a motor. The lower end of the lifting mechanism is mounted on the slide box, and the upper end is mounted on the tool post.

[0009] Preferably, the tool holder is provided with a connecting hole, one end of the tool bar passes through the connecting hole and is locked by a bolt, and the other end is inclined to the middle of a connecting rod. Each end of the connecting rod is connected to a rolling roller. A washer is provided between the tool bar and the bolt, and the washer is located in the connecting hole. The connecting hole is a rectangular hole or a square hole, and the shape and size of the tool bar match the connecting hole. The lifting mechanism is a hydraulic cylinder.

[0010] Preferably, the rolling roller includes a convex arc surface roller group and a concave arc surface roller group, the arc radius of the convex arc surface roller group and the concave arc surface roller group is the same as the radius of the rounded chamfer of the workpiece; the rolling roller makes the extrusion depth of the rounded chamfer of the workpiece 0.1mm-0.8mm.

[0011] Preferably, the convex arc surface roller group includes a convex arc surface roller and a sinusoidal convex roller with a sine line protruding from the convex arc surface; the concave arc surface roller group includes a concave arc surface roller and a sinusoidal concave roller with a sine line protruding from the concave arc surface; the formula for calculating the sine line is y=dsin(T·x)+D, x∈(-π,2πr+π).

[0012] Preferably, the centering and sliding mechanism includes a centering mechanism and a limiting mechanism. The centering mechanism is rotatably mounted on the bed and is coaxially opposite to the chuck mechanism. The limiting mechanism can limit the rotation angle of the centering mechanism.

[0013] Preferably, the centering mechanism includes a rotating support, a rotating frame, a centering frame, a screw, and a handle. The bottom of the rotating support is fixedly mounted on the bed, and a short shaft rotates on the top via a bearing. The short shaft is connected to the center of the rotating frame. The screw passes through the rotating frame along its length, and both ends of the screw are rotatably mounted on the side wall of the rotating frame. One end of the screw protrudes from the rotating frame and is perpendicularly inserted into the handle. Two sections of oppositely helical threads are symmetrically arranged on the screw, and a centering frame is symmetrically connected to each of the two oppositely helical threads. The other end of each centering frame passes through the side wall of the rotating frame and is connected to two rollers. The rollers abut against the side wall of the workpiece. The centering frame is used to rotatably clamp the end of the workpiece. The centering frame is L-shaped, and the end of the centering frame is U-shaped or V-shaped, with a roller rotatably connected to each of the two arms. At least one positioning slider is provided on the centering frame, and at least one guide groove is provided inside the rotating frame. The positioning slider is slidably disposed in the guide groove.

[0014] Preferably, the limiting mechanism includes a rotating support, a limiting shaft, a positioning rod, and a positioning groove. The limiting shaft is rotatably sleeved in the through hole at the top of the rotating support, and its bottom is fixedly connected to the bed. One end of the limiting shaft can be movably inserted into the short shaft on the centering mechanism, and the other end is provided with the positioning rod. The rotating support is provided with two limiting posts along the circumferential direction. The limiting posts are provided with positioning grooves, and the positioning rod can be engaged in the positioning grooves and locked by a pin. The central angle of the two limiting posts is 90°.

[0015] This invention also relates to a rounded bevel rolling process for cylindrical parts, based on the aforementioned rounded bevel rolling machine for cylindrical parts, specifically including the following steps:

[0016] S1, clamp one end of the workpiece onto the chuck mechanism and the other end onto the centering sliding mechanism. Select two rolling rollers that match the shape and size of the workpiece's arc chamfer. Control the lifting tool holder mechanism through the electrical control cabinet to first make the arc rollers fit against the workpiece's arc chamfer and control the extrusion depth of the workpiece's arc chamfer to be 0.1mm-0.8mm. Turn on the motor of the chuck mechanism to rotate the workpiece and perform the initial rolling on the corresponding arc chamfer.

[0017] S2, After the initial rolling is completed, turn off the motor of the chuck mechanism, remove the tool bar from the tool holder, rotate it 180° and then reinstall it so that the sinusoidal roller can fit against the arc chamfer of the workpiece, and control the extrusion depth of the arc chamfer of the workpiece to be 0.1mm-0.8mm. Turn on the motor of the chuck mechanism to rotate the workpiece and perform a second rolling on the corresponding arc chamfer.

[0018] S3. Repeat the above steps, replace with rolling rollers of matching shape and size, and roll all the rounded chamfers on the workpiece twice.

[0019] The present invention achieves the following technical effects compared to the prior art:

[0020] This invention utilizes a composite rolling method with two rolling rollers. The rolling strip can reduce the contact area between the rolling roller and the rounded chamfer, while generating a reciprocating feed motion along the axial direction of the cylindrical part within the rounded chamfer. This increases the plastic deformation during rolling, effectively increases the residual compressive stress at the rounded chamfer, and improves the service life of the cylindrical part. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the structure of the rounding and chamfering rolling machine for cylindrical parts in an embodiment of the present invention. Figure 1 ;

[0023] Figure 2 This is a schematic diagram of the structure of the rounding and chamfering rolling machine for cylindrical parts in an embodiment of the present invention. Figure 2 ;

[0024] Figure 3 This is a schematic diagram of the centering mechanism in an embodiment of the present invention;

[0025] Figure 4 This is a cross-sectional schematic diagram of the centering mechanism in an embodiment of the present invention;

[0026] Figure 5 This is a schematic diagram of the structure of the convex arc surface roller assembly in an embodiment of the present invention;

[0027] Figure 6 This is a schematic diagram of the concave arc surface roller assembly in an embodiment of the present invention;

[0028] Figure 7 This is a process flow diagram of the convex arc surface roller assembly in an embodiment of the present invention. Figure 1 ;

[0029] Figure 8 This is a process flow diagram of the convex arc surface roller assembly in an embodiment of the present invention. Figure 2 ;

[0030] Figure 9 This is a process flow diagram of the concave arc surface roller assembly in an embodiment of the present invention;

[0031] Figure 10 This is a diagram illustrating the calculation of the displacement relationship between the tool holder and the workpiece in an embodiment of the present invention;

[0032] Figure 11 This is a force analysis diagram of the rounded chamfer in an embodiment of the present invention;

[0033] In the diagram: 1-Bed, 2-Three-jaw chuck, 3-Motor, 4-Apron, 5-Lifting mechanism, 6-Tool post, 7-Guide rail, 8-Ball screw mechanism, 9-Tool holder, 10-Connecting rod, 11-Rolling roller, 12-Shim, 13-Bolt, 14-Swivel support, 15-Swivel frame, 16-Centering frame, 17-Screw, 18-Handle, 19-Roller, 20-Limiting shaft, 21-Positioning rod, 22-Positioning groove, 23-Pin, 24-Electrical control cabinet, 25-Short shaft, 26-Workpiece, 27-Bearing, 28-Positioning slider. Detailed Implementation

[0034] 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.

[0035] The purpose of this invention is to provide a rolling mill and process for rounding the chamfer of cylindrical parts, so as to solve the problems existing in the prior art, increase the extrusion plastic deformation of the rolling roller and the rounded chamfer, generate greater residual compressive stress on the rounded chamfer, and improve the service life of cylindrical parts.

[0036] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0037] Example 1

[0038] like Figures 1 to 6 As shown, this embodiment provides a cylindrical part arc chamfering rolling machine, including a bed 11 and a chuck mechanism, a lifting tool post mechanism, a centering sliding mechanism and an electrical control cabinet 24 disposed on the bed 11. One end of the workpiece 26 is clamped on the chuck mechanism and the other end is rotatably supported on the centering sliding mechanism. The lifting tool post mechanism is slidably disposed on the bed 11 along the axial direction of the workpiece 26. A tool bar 9 is movably connected to the lifting tool post mechanism. At least two types of rolling rollers 11 are rotatably disposed on the tool bar 9. A three-dimensional rolling strip is protruding from the contact surface of one of the rolling rollers 11. The rolling roller 11 can fit against the arc chamfer of the workpiece 26. The chuck mechanism and the lifting tool post mechanism are communicatively connected to the electrical control cabinet 24.

[0039] As an optional solution, in this embodiment, the chuck mechanism includes a three-jaw chuck 2 and a motor 3. The chuck of the three-jaw chuck 2 is connected to the rotating shaft of the motor 3, providing power for the rotation of the workpiece 26. The three-jaw chuck 2 is a conventional clamping mechanism in the art, and will not be described in detail here.

[0040] As an optional solution, in this embodiment, the lifting tool post mechanism includes an apron 4, a lifting mechanism 5, and a tool post 6. The apron 4 is slidably mounted on the bed 11 via a ball screw mechanism 8, which is connected to a motor 3. The lower end of the lifting mechanism 5 is mounted on the apron 4, and the upper end is mounted on the tool post 6, enabling the translation and lifting of the tool post 6 for easy engagement with the workpiece 26. A guide rail 7 is also provided between the apron 4 and the bed 11 for precise positioning.

[0041] As an optional solution, in this embodiment, the tool holder 6 is provided with a connecting hole, one end of the tool bar 9 passes through the connecting hole and is locked by a bolt 13, and the other end is inclined to the middle of a connecting rod 10. Both ends of the connecting rod 10 are respectively connected to a rolling roller 11, such as... Figure 5 and Figure 6 As shown, a combination of a smooth rolling roller and a rolling roller with rolling strips is preferred. A washer 12 is provided between the tool holder 9 and the bolt 13, and the washer 12 is located in the connecting hole. The connecting hole is a rectangular hole or a square hole, and the shape and size of the tool holder 9 match the connecting hole. The lifting mechanism 5 is a hydraulic cylinder. Preferably, the connecting rod 10 forms a 45° angle with the tool holder 9 to facilitate matching the arc chamfer of the rolling roller 11 with the workpiece 26. The tool holder 9 is specially adjusted for its extension length within the tool holder 6 and can be flipped to achieve switching between the arc roller and the sinusoidal roller. The tool holder 9 moves along the X and Y directions of the machine tool through the slide box 4 and the displacement lifting device.

[0042] As an optional solution, in this embodiment, the rolling roller 11 includes a convex arc surface roller group and a concave arc surface roller group, and the arc radius of the convex arc surface roller group and the concave arc surface roller group is the same as the radius of the arc chamfer of the workpiece 26; the rolling roller 11 makes the extrusion depth of the arc chamfer of the workpiece 26 0.1mm-0.8mm.

[0043] As an optional solution, in this embodiment, the convex arc surface roller group includes a convex arc surface roller and a sinusoidal convex roller with a sinusoidal line protruding from the convex arc surface; the concave arc surface roller group includes a concave arc surface roller and a sinusoidal concave roller with a sinusoidal line protruding from the concave arc surface; the formula for calculating the sinusoidal line is y=dsin(T·x)+D, x∈(-π,2πr+π), d is the maximum value of half the thickness of the rolling roller 11, T is the single period coefficient of the sinusoidal line, D is the maximum value of half the wall thickness of the sinusoidal line, and r is the radius of the rolling roller. In this embodiment, d=4mm, T=0.4, D=0.2mm, and r=30mm. Wherein, as... Figure 7 or Figure 8 As shown, when rolling the inner bore step or the outer cylindrical shoulder chamfer of a cylindrical shaft, a convex arc surface roller and a sinusoidal convex roller can be selected; for example... Figure 9 As shown, when rolling the end chamfer of a cylindrical shaft or column, concave arc rollers and sinusoidal concave rollers can be selected. Simultaneously, when the centering and sliding device is adjusted to the transverse direction, it rolls the inner bore step or outer cylindrical shoulder chamfer of the cylindrical shaft; when the centering and sliding device is adjusted to the longitudinal direction, it performs combined rolling on the end chamfer of the cylindrical shaft or column. The period and width of the curve can be adjusted by modifying the parameters of the sine curve formula. The axial cross-sectional profile of the sinusoidal roller matches the shape and size of the corresponding concave and convex arc chamfers. The concave roller is used to roll the convex arc chamfer.

[0044] As an optional solution, the centering and sliding mechanism in this embodiment includes a centering mechanism and a limiting mechanism. The centering mechanism is rotatably mounted on the bed 11 and is coaxially arranged with the chuck mechanism. The limiting mechanism can limit the rotation angle of the centering mechanism.

[0045] As an optional solution, the centering mechanism in this embodiment includes a rotating support 14, a rotating frame 15, a centering frame 16, a screw 17, and a handle 18. The bottom of the rotating support 14 is fixedly mounted on the bed 11, and a short shaft 25 is rotatably mounted on the top via a bearing 27. The short shaft 25 is connected to the center of the rotating frame 15. The screw 17 passes through the rotating frame 15 along its length. Both ends of the screw 17 are rotatably mounted on the side wall of the rotating frame 15. One end of the screw 17 protrudes from the rotating frame 15 and is vertically inserted into the handle 18. Two sections of threads with opposite directions are symmetrically arranged on the screw 17. A centering bracket 16 is symmetrically connected to each of the two oppositely helical threads. The other end of each centering bracket 16 penetrates the side wall of the rotating frame 15 and is connected to two rollers 19. The rollers 19 abut against the side wall of the workpiece 26. The centering bracket 16 is used to rotate and clamp the end of the workpiece 26. The centering bracket 16 is L-shaped, with U-shaped or V-shaped ends, and each of its two arms is rotatably connected to a roller 19. At least one positioning slider 28 is provided on the centering bracket 16, and at least one guide groove is provided inside the rotating frame 15, with the positioning slider 28 slidably positioned within the guide groove. In this embodiment, when the screw 17 is rotated using the handle 18, the two symmetrically distributed centering brackets 16 can move in opposite directions via their oppositely helical threads, achieving clamping and loosening of the workpiece 26.

[0046] As an optional solution, the limiting mechanism in this embodiment includes a rotating support 14, a limiting shaft 20, a positioning rod 21, and a positioning groove 22. The limiting shaft 20 is rotatably sleeved in the through hole at the top of the rotating support 14 via a bearing 27, and the bottom is fixedly connected to the bed 11. One end of the limiting shaft 20 can be movably inserted into the short shaft 25 on the centering mechanism, and the other end (middle) is provided with a positioning rod 21. The short shaft 25 preferably has a cross groove structure for easy insertion. The rotating support 14 is provided with two limiting posts along the circumferential direction. The limiting posts are provided with positioning grooves 22. The positioning rod 21 can be engaged in the positioning groove 22 and locked in the positioning groove 22 by a pin 23. The central angle of the two limiting posts is 90°, which allows the centering frame 16 to rotate in both directions around the axis of the workpiece 26 from 0° to 90°, avoiding interference with the movement of the tool holder 6 when rolling the inner hole.

[0047] Example 2

[0048] like Figures 7 to 11 As shown, this embodiment also provides a rounded bevel rolling process for cylindrical parts, based on the rounded bevel rolling machine tool for cylindrical parts described in Embodiment 1 above, specifically including the following steps:

[0049] S1, clamp one end of the workpiece 26 onto the chuck mechanism and the other end onto the centering sliding mechanism. Select two rolling rollers 11 that match the shape and size of the arc chamfer of the workpiece 26. Control the lifting tool holder 6 mechanism through the electrical control cabinet 24 to first make the arc roller fit with the arc chamfer of the workpiece 26, and control the extrusion depth of the arc chamfer of the workpiece 26 to be 0.1mm-0.8mm. Turn on the motor 3 of the chuck mechanism to make the workpiece 26 rotate and perform the initial rolling on the corresponding arc chamfer.

[0050] S2, After the initial rolling is completed, turn off the motor 3 of the chuck mechanism, remove the tool bar 9 from the tool holder 6, rotate it 180° and then reinstall it so that the sinusoidal roller can fit against the arc chamfer of the workpiece 26, and control the extrusion depth of the arc chamfer of the workpiece 26 to be 0.1mm-0.8mm. Turn on the motor 3 of the chuck mechanism to rotate the workpiece 26 and perform a second rolling on the corresponding arc chamfer.

[0051] S3. Repeat the above steps, replace with a rolling roller 11 with a matching shape and size, and roll all the rounded chamfers on the workpiece 26 twice.

[0052] like Figure 10 As shown, since the tool holder 9 is set at 45°, it can move relative to the inner arc chamfer, i.e., from point A to point C. After the tool holder 9 moves to the safe position, the coordinates of point C relative to point A are (-X). AC =X BC +L AB ·sin45°,-Y AC =Y BC +L AB ·cos45°), where X AC Let X be the horizontal distance from point A to point C. BC L is the horizontal distance from point B to point C. AB Y is the distance between the centers of the arcs of the rollers. AC Y is the perpendicular distance from point A to point C. BC This is the perpendicular distance from point B to point C.

[0053] Therefore, the maximum depth to which connecting rod 10 extends into the stepped groove of workpiece 26 is: Δx=(L AB / 2·sin45°)-(S / 2·sin45°), where Δx represents the maximum depth to which connecting rod 10 extends into the stepped groove of workpiece 26, L AB S is the distance between the centers of the arcs of the rollers, and S is the diameter of the tilting tool holder 9.

[0054] The stress analysis of the two rolling processes is as follows: Figure 10As shown, this embodiment utilizes the feedless rolling plastic deformation of raised or recessed arc rollers, and the periodic continuous contact between the sinusoidal arc rollers and the arc chamfer, to achieve reciprocating feed motion along the axial direction of the cylindrical part within the arc chamfer. This increases the extrusion plastic deformation between the rollers and the arc chamfer, increases the residual compressive stress on the material surface, suppresses crack initiation along the transition arc of the cylindrical part, and improves the service life of the cylindrical part.

[0055] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A rolling machine for chamfering cylindrical parts, characterized in that: The machine includes a bed and a chuck mechanism, a tool lifting mechanism, a centering and sliding mechanism, and an electrical control cabinet mounted on the bed. One end of the workpiece is engaged with the chuck mechanism, and the other end is rotatably supported on the centering and sliding mechanism. The tool lifting mechanism is slidably mounted on the bed along the axis of the workpiece. A tool holder is movably connected to the tool lifting mechanism, and at least two types of rolling rollers are rotatably mounted on the tool holder. One of the rolling rollers has a sinusoidal rolling strip protruding from its contact surface. The rolling roller can interact with the workpiece. The rounded chamfer is fitted together, and the chuck mechanism and the lifting tool holder mechanism are communicatively connected to the electrical control cabinet; the rolling roller includes a convex arc surface roller group and a concave arc surface roller group, and the arc radius of the convex arc surface roller group and the concave arc surface roller group is the same as the radius of the rounded chamfer of the workpiece; the convex arc surface roller group includes a convex arc surface roller and a sinusoidal convex roller with a sine line protruding from the convex arc surface; the concave arc surface roller group includes a concave arc surface roller and a sinusoidal concave roller with a sine line protruding from the concave arc surface; When rolling the inner bore step or the outer cylindrical shoulder chamfer of a cylindrical shaft, convex arc surface rollers and sinusoidal convex rollers are selected; when rolling the end arc chamfer of a cylindrical shaft or column, concave arc surface rollers and sinusoidal concave rollers are selected.

2. The cylindrical part rounded beveling rolling machine according to claim 1, characterized in that: The chuck mechanism includes a three-jaw chuck and a motor, with the chuck of the three-jaw chuck connected to the rotating shaft of the motor.

3. The cylindrical part rounded beveling rolling machine according to claim 1, characterized in that: The lifting tool post mechanism includes a slide box, a lifting mechanism, and a tool post. The slide box is slidably mounted on the bed via a ball screw mechanism, which is connected to a motor. The lower end of the lifting mechanism is mounted on the slide box, and the upper end is mounted on the tool post.

4. The cylindrical part rounded beveling rolling machine according to claim 3, characterized in that: The tool holder has a connecting hole. One end of the tool bar passes through the connecting hole and is locked with a bolt. The other end is inclined to the middle of a connecting rod. One end of the connecting rod is connected to one type of roller, and the other end is connected to another type of roller. A washer is provided between the tool bar and the bolt, and the washer is located inside the connecting hole. The connecting hole is a rectangular hole or a square hole, and the shape and size of the tool bar match the connecting hole. The lifting mechanism is a hydraulic cylinder.

5. The cylindrical part rounded beveling rolling machine according to claim 4, characterized in that: The rolling rollers compress the workpiece's chamfered corner to a depth of 0.1mm-0.8mm.

6. The cylindrical part rounded beveling rolling machine according to claim 5, characterized in that: The formula for calculating the sine curve is y = dsin(T·x) + D, x ∈ (-π, 2πr + π), d is the maximum value of half the thickness of the rolling roller 11, T is the single period coefficient of the sine curve, D is the maximum value of half the wall thickness of the sine curve, and r is the radius of the rolling roller.

7. The cylindrical part rounded beveling rolling machine according to claim 1, characterized in that: The centering and sliding mechanism includes a centering mechanism and a limiting mechanism. The centering mechanism is rotatably mounted on the bed and is coaxially opposite to the chuck mechanism. The limiting mechanism can limit the rotation angle of the centering mechanism.

8. The cylindrical part rounded beveling rolling machine according to claim 7, characterized in that: The centering mechanism includes a rotating support, a rotating frame, a centering frame, a screw, and a handle. The bottom of the rotating support is fixedly mounted on the bed, and a short shaft rotates on the top via a bearing. The short shaft is connected to the center of the rotating frame. The screw passes through the rotating frame along its length, and both ends of the screw are rotatably mounted on the side wall of the rotating frame. One end of the screw protrudes from the rotating frame and is perpendicularly inserted into the handle. The screw has two symmetrically arranged threads with opposite directions. A centering frame is symmetrically connected to each of the two threads with opposite directions. The other end of each centering frame passes through the side wall of the rotating frame and is connected to two rollers. The rollers abut against the side wall of the workpiece. The centering frame is used to rotatably clamp the end of the workpiece. The centering frame is L-shaped, and the end of the centering frame is U-shaped or V-shaped, with a roller rotatably connected to each of the two arms. The centering frame is provided with at least one positioning slider, and the rotating frame has at least one guide groove inside, in which the positioning slider is slidably mounted.

9. The cylindrical part rounded beveling rolling machine according to claim 7, characterized in that: The limiting mechanism includes a rotating support, a limiting shaft, a positioning rod, and a positioning groove. The limiting shaft is rotatably sleeved in the through hole at the top of the rotating support, and its bottom is fixedly connected to the bed. One end of the limiting shaft can be movably inserted into the short shaft on the centering mechanism, and the other end is provided with the positioning rod. The rotating support is provided with two limiting posts along the circumferential direction. The limiting posts are provided with positioning grooves, and the positioning rod can be engaged in the positioning grooves and locked by a pin. The central angle of the two limiting posts is 90°.

10. A rounded bevel rolling process for cylindrical parts, based on the rounded bevel rolling machine tool for cylindrical parts according to any one of claims 1-9, characterized in that, Specifically, the steps include the following: S1, clamp one end of the workpiece onto the chuck mechanism and the other end onto the centering sliding mechanism. Select two rolling rollers that match the shape and size of the workpiece's arc chamfer. Control the lifting tool holder mechanism through the electrical control cabinet to first make the arc rollers fit against the workpiece's arc chamfer and control the extrusion depth of the workpiece's arc chamfer to be 0.1mm-0.8mm. Turn on the motor of the chuck mechanism to rotate the workpiece and perform the initial rolling on the corresponding arc chamfer. S2, After the initial rolling is completed, turn off the motor of the chuck mechanism, remove the tool bar from the tool holder, rotate it 180° and then reinstall it so that the sinusoidal roller can fit against the arc chamfer of the workpiece, and control the extrusion depth of the arc chamfer of the workpiece to be 0.1mm-0.8mm. Turn on the motor of the chuck mechanism to rotate the workpiece and perform a second rolling on the corresponding arc chamfer. S3. Repeat the above steps, replace with rolling rollers of matching shape and size, and roll all the rounded chamfers on the workpiece twice.

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