A machining process for knurled parts

Abstract

This invention discloses a processing technology for knurled parts, comprising: S1: clamping the workpiece with a clamping mechanism and coaxially feeding it to a predetermined position within the processing hole of a processing disc; S2: adjusting the spacing between the two knurling cutter assemblies in each knurling mechanism according to the spacing between the two knurled sections to be processed on the workpiece; S3: driving the workpiece to rotate uniformly by a motor; S4: driving a plurality of driving mechanisms to move radially inward synchronously, so that each set of knurling cutter assemblies rolls against the outer circumferential surface of the workpiece to form two knurled sections on the workpiece; S5: driving a plurality of driving mechanisms to move radially outward synchronously again, so that each set of knurling cutter assemblies disengages from the workpiece; S6: stopping the motor, the clamping mechanism engages the clamping of the workpiece, and the workpiece is removed. This invention improves workpiece processing efficiency while greatly enhancing the accuracy and stability of workpiece processing.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of automobile accessories, and particularly relates to a knurling part machining process. BACKGROUND

[0002] In the automobile manufacturing industry, connecting pieces serve as key components, bearing the important task of stably and firmly connecting different parts together. This connection not only requires structural stability, but must also be able to withstand forces and vibrations from all directions, ensuring the safety and reliability of the automobile under various driving conditions. In order to improve the connection stability between the connecting piece and the connected object, especially to prevent loosening or falling off under long-term use or extreme working conditions, engineers have designed various improvement measures. One common approach is to machine a knurled section on the shaft surface of the connecting piece. The knurling process forms a series of regular or irregular protruding textures on the metal surface, significantly increasing the circumferential friction between the contact surfaces, thereby improving the anti-torsion force of the molded part. This design is particularly suitable for application scenarios that require torque or rotational force. In addition, in order to further enhance the load-carrying capacity of the connecting piece in the axial direction, i.e., the stability under the action of pulling force, engineers have designed an annular groove between the two knurled sections to improve the pulling force of the molded part.

[0003] However, the current processing technology faces a series of challenges in manufacturing such connecting pieces with knurled sections and annular grooves. First, the processing process is complex and time-consuming, and the precise machining of knurls and annular grooves requires high-precision machine tools and professional operation skills, which not only increases production costs but also limits the overall efficiency of the production line. Second, the processing stability is insufficient, especially during mass production, due to factors such as material properties, tool wear, machine precision, etc., it is difficult to achieve consistency in the size and shape of knurls and annular grooves, thereby affecting the performance and quality of the connecting piece. SUMMARY

[0004] In view of the above problems existing in the existing workpiece machining, the present application aims to provide a knurling part machining process with high efficiency and stability.

[0005] The specific technical solutions are as follows:

[0006] A knurling part processing technology, using a knurling processing device, comprising: the knurling processing device comprises a processing disc, a plurality of knurling mechanisms and a driving mechanism, the processing disc is coaxially provided with a processing hole, a plurality of the knurling mechanisms are distributed along the circumference of the processing disc, and each of the knurling mechanisms can slide along the radial direction of the processing disc, each of the knurling mechanisms comprises: a driving block and two groups of knurling cutter assemblies installed on the driving block, the driving block is slidably installed on the processing disc along the radial direction of the processing disc, the two groups of knurling cutter assemblies are distributed along the axial direction of the processing disc, and the distance between the two groups of knurling cutter assemblies is adjustable, and the driving mechanism is in transmission connection with a plurality of the driving blocks, and is used for driving a plurality of the driving blocks to slide synchronously along the radial direction of the processing disc outward or inward.

[0007] The processing technology comprises:

[0008] S1: clamping the workpiece by the clamping mechanism and coaxially sending it to the predetermined position in the processing hole of the processing disc;

[0009] S2: adjusting the distance between the two knurling cutter assemblies in each of the knurling mechanisms according to the distance between the two knurling sections to be processed on the workpiece;

[0010] S3: driving the workpiece to rotate uniformly by the motor;

[0011] S4: the driving mechanism drives a plurality of the driving mechanisms to move synchronously in the radial direction inward, so that each group of the knurling cutter assemblies is in contact with the outer circumferential surface of the workpiece to form two knurling sections on the workpiece;

[0012] S5: the driving mechanism drives a plurality of the driving mechanisms to move synchronously in the radial direction outward again, so that each group of the knurling cutter assemblies is separated from the workpiece;

[0013] S6: the motor is stopped, the clamping mechanism is in contact with the clamping of the workpiece, and the workpiece is taken off.

[0014] As a further improvement and optimization of the present scheme, a blowing mechanism is further installed on the processing disc, and the blowing mechanism is used to blow away the waste generated during the processing of the workpiece.

[0015] As a further improvement and optimization of the present scheme, the blowing mechanism comprises a plurality of air jet heads, and the plurality of air jet heads are circumferentially installed on the inner wall of the processing hole.

[0016] As a further improvement and optimization of the present scheme, each of the knurling mechanisms further comprises a turning tool, the turning tool is installed on the driving block and located at the intermediate position of the two knurling cutter assemblies, and the distance between the tool head of the turning tool and the central axis of the processing hole is smaller than the distance between the knurling cutter assemblies and the central axis of the processing hole.

[0017] As a further improvement and optimization of the present solution, two groups of the knurling tool assemblies are symmetrically distributed on both sides of the driving block, each of the knurling tool assemblies comprises:

[0018] a tool holder, one end of the tool holder is slidably mounted on the driving block along the axial direction of the machining disc;

[0019] a knurling tool wheel, the knurling tool wheel is rotatably mounted at the other end of the tool holder, and the distance between the tool head of the turning tool and the center axis of the machining hole is smaller than the distance between the knurling tool wheel and the center axis of the machining hole.

[0020] As a further improvement and optimization of the present solution, a bidirectional screw is arranged between the two tool holders of the two groups of knurling tool assemblies, and the two tool holders are respectively threadedly mounted on the outside of the bidirectional screw, when the bidirectional screw rotates, the two tool holders move closer or farther away.

[0021] As a further improvement and optimization of the present solution, handles are mounted at both ends of the bidirectional screw.

[0022] As a further improvement and optimization of the present solution, a rectangular sliding groove is arranged through the driving block along the axial direction of the machining disc;

[0023] One end of each of the two tool holders has a rectangular sliding block matched with the rectangular sliding groove, and the two rectangular sliding blocks are respectively slidably mounted on both sides of the rectangular sliding groove, and each of the rectangular sliding blocks is provided with a scale.

[0024] As a further improvement and optimization of the present solution, a plurality of guide sliding grooves are arranged on the machining disc in the radial direction and are in communication with the machining hole positions, and a plurality of driving blocks are respectively slidably mounted in the guide sliding grooves.

[0025] As a further improvement and optimization of the present solution, the driving mechanism comprises:

[0026] a plurality of eccentric shafts, the plurality of eccentric shafts are rotatably mounted on the machining disc in the circumferential direction, and each of the eccentric shafts is eccentrically sleeved with a eccentric wheel at the outside, each of the eccentric wheels is coaxially sleeved with a driving ring at the outside, a plurality of first connecting rods are arranged between the plurality of driving rings and the plurality of driving blocks, one end of each of the first connecting rods is connected with the outer circumferential surface of the driving ring, and the other end is hingedly connected with the driving block;

[0027] The eccentric shaft among the plurality of eccentric shafts is a first eccentric shaft, the eccentric shaft adjacent to the driving eccentric shaft is a last eccentric shaft, the plurality of eccentric shafts between the last eccentric shaft and the first eccentric shaft are transmission eccentric shafts, the outer part of each transmission eccentric shaft and the outer part of the first eccentric shaft are connected with a V-shaped transmission frame, the middle part of the V-shaped transmission frame is connected with the transmission eccentric shaft / first eccentric shaft, and the last eccentric shaft is connected with a transmission rod;

[0028] The V-shaped transmission frame is connected with a curved rod.

[0029] The driving mechanism further comprises a hydraulic oil cylinder, one end of the hydraulic oil cylinder is hingedly connected with the machining disc, and the other end is connected with one end of the V-shaped transmission frame on the first eccentric shaft.

[0030] Compared with the prior art, the technical scheme has the following advantages:

[0031] (1) In the present application, two knurling tool assemblies in the knurling mechanism simultaneously process two knurled sections on the workpiece, improving the processing efficiency. Meanwhile, the distance between the two knurling tool assemblies in the same knurling mechanism can be adjusted to process two knurled sections with different distances, thereby meeting different processing requirements of the workpiece.

[0032] (2) In the present application, the knurled section of each section of the workpiece is distributed with a plurality of knurling tool assemblies. During knurling processing, the plurality of knurling tool assemblies of each knurled section are pressed from various directions to make the workpiece bear force uniformly, thereby greatly improving the accuracy and stability of workpiece processing.

[0033] (3) In the present application, the plurality of knurling tool assemblies in the two knurling mechanisms are driven radially by the same driving mechanism to ensure the consistency of the pressing force of the plurality of knurling tool assemblies, thereby further improving the accuracy and stability of workpiece processing.

[0034] (4) In the present application, each knurling mechanism further comprises a turning tool, which is installed on the driving block and located at the middle position between the two knurling tool assemblies. The distance between the tool head of the turning tool and the center axis of the machining hole is smaller than the distance between the knurling tool assembly and the center axis of the machining hole. When the plurality of knurling tool assemblies move radially inward, the tool head of the turning tool first contacts and presses the outer surface of the workpiece to process the annular groove of the workpiece, thereby realizing synchronous knurling and annular processing, avoiding tool head replacement or multiple program operations of the machine, and further improving the processing efficiency.

[0035] (5) the driving mechanism in the application adopts hydraulic oil cylinder to convert the extension and retraction power of the hydraulic oil cylinder into the rotary torque of a plurality of eccentric shafts through a plurality of V-shaped transmission frames, a plurality of curved rods and a transmission rod, and a plurality of eccentric shafts drive a plurality of driving blocks to slide radially inward or outward synchronously through a plurality of eccentric wheels, a plurality of driving rings and a plurality of first connecting rods, which not only has a clever structure and low manufacturing cost, but also uses hydraulic oil cylinder as a power source and uses parallel connecting rods and lever principle combination to transmit and output power, and has high power transmission stability. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 It is a structure schematic view of the knurling processing device of the knurling part processing technology of the application,

[0037] Figure 2 It is an explosion schematic view of the knurling processing device of the knurling part processing technology of the application,

[0038] Figure 3 It is a schematic view of the knurling mechanism of the knurling processing device of the knurling part processing technology of the application,

[0039] Figure 4 It is an explosion schematic view of the knurling mechanism of the knurling processing device of the knurling part processing technology of the application,

[0040] In the drawings: 1, processing disc; 2, knurling mechanism; 3, driving mechanism; 4, blowing mechanism; 11, processing hole position; 12, rectangular sliding groove; 21, driving block; 22, bidirectional screw rod; 23, handle; 24, turning tool; 25, knurling tool assembly; 31, hydraulic oil cylinder; 32, V-shaped transmission frame; 33, curved rod; 34, eccentric wheel; 35, driving ring; 36, first connecting rod; 37, transmission rod; 38, eccentric shaft; 251, tool holder; 252, knurling tool wheel; 253, rectangular sliding block; 2531, scale. DETAILED DESCRIPTION

[0041] The application will be further described below in combination with the drawings and specific embodiments, but not as the limitation of the application.

[0042] Figure 1 It is a structure schematic view of the knurling processing device of the knurling part processing technology of the application, Figure 2 It is an explosion schematic view of the knurling processing device of the knurling part processing technology of the application, Figure 3 It is a schematic view of the knurling mechanism of the knurling processing device of the knurling part processing technology of the application, Figure 4 It is an explosion schematic view of the knurling mechanism of the knurling processing device of the knurling part processing technology of the application, such as Figures 1 to 4As shown, a processing process of a knurling part of a preferred embodiment is shown, using a knurling processing device, including: the knurling processing device includes a processing disc 1, a plurality of knurling mechanisms 2 and a driving mechanism 3, the processing disc 1 is coaxially provided with a processing hole, a plurality of knurling mechanisms 2 are distributed along the circumference of the processing disc 1, and each knurling mechanism 2 can slide along the radial direction of the processing disc 1, each knurling mechanism 2 includes: a driving block 21 and two groups of knurling cutter assemblies 25 installed on the driving block 21, the driving block 21 is slidably installed on the processing disc 1 along the radial direction of the processing disc 1, the two groups of knurling cutter assemblies 25 are distributed along the axial direction of the processing disc 1, and the distance between the two groups is adjustably arranged, and the driving mechanism 3 is drivingly connected with the plurality of driving blocks 21, for driving the plurality of driving blocks 21 to synchronously slide along the radial direction of the processing disc 1 outward or inward;

[0043] The processing process includes:

[0044] S1: The workpiece is clamped by the clamping mechanism and coaxially sent to the predetermined position in the processing hole 11 of the processing disc 1;

[0045] S2: The distance between the two knurling sections on the workpiece is adjusted to adjust the distance between the two knurling cutter assemblies 25 in each knurling mechanism 2;

[0046] S3: The workpiece is uniformly rotated by the motor;

[0047] S4: The driving mechanism 3 drives the plurality of driving mechanisms 3 to synchronously move radially inward, so that each group of knurling cutter assemblies 25 is in contact with the outer circumferential surface of the workpiece to form two knurling sections on the workpiece;

[0048] S5: The driving mechanism 3 again drives the plurality of driving mechanisms 3 to synchronously move radially outward, so that each group of knurling cutter assemblies 25 is out of contact with the workpiece;

[0049] S6: The motor is stopped, the clamping mechanism is in contact with the clamping of the workpiece, and the workpiece is taken down.

[0050] In the embodiment, the two groups of knurling cutter assemblies 25 in the knurling mechanism 2 simultaneously process the two knurling sections on the workpiece at the same time, which improves the processing efficiency, and the distance between the two knurling cutter assemblies 25 in the same group of knurling mechanisms 2 is adjustably arranged to process two knurling sections with different distances, thereby meeting different processing requirements of the workpiece.

[0051] In the embodiment, the circumferential direction of each knurling section of the workpiece is provided with a plurality of knurling cutter assemblies 25, and during knurling processing, the plurality of knurling cutter assemblies 25 of each knurling section are pressed from various directions to make the workpiece bear force uniformly, and also greatly improve the accuracy and stability of workpiece processing.

[0052] The several knurling tool assemblies 25 in the two groups of knurling mechanisms 2 in this embodiment are driven radially by the same driving mechanism 3, which ensures the consistency of the rolling pressure of the several knurling tool assemblies 25 and further improves the accuracy and stability of workpiece machining.

[0053] Further, as a preferred embodiment, the machining disc 1 is also provided with a blowing mechanism 4, which is used to blow away the waste generated during machining of the workpiece, so as to reduce the influence of the waste generated during knurling on the knurling accuracy.

[0054] Further, as a preferred embodiment, the blowing mechanism 4 comprises several jet heads, which are installed circumferentially on the inner wall of the machining hole 11.

[0055] More preferably, the jet head is a circular jet head, and the outer circular surface of the jet head is provided with several jet holes, which can jet air in all directions, further improving the cleaning effect of the waste.

[0056] Further, as a preferred embodiment, each knurling mechanism 2 further comprises a turning tool 24, which is installed on the driving block 21 and located at the middle position between the two knurling tool assemblies 25, and the distance between the tool head of the turning tool 24 and the center axis of the machining hole 11 is smaller than the distance between the knurling tool assembly 25 and the center axis of the machining hole 11. The purpose is that when the several knurling tool assemblies 25 move radially inward, the tool head of the turning tool 24 first contacts and rolls the outer surface of the workpiece to process the annular groove of the workpiece, so as to realize synchronous knurling and annular machining, avoid stopping and changing the tool head or multiple program operation of the machine, and further improve the machining efficiency.

[0057] Further, as a preferred embodiment, the two groups of knurling tool assemblies 25 are symmetrically distributed on the two sides of the driving block 21, each knurling tool assembly 25 comprises a tool holder 251 and a knurling tool wheel 252, one end of the tool holder 251 is slidably installed on the driving block 21 along the axial direction of the machining disc 1; the knurling tool wheel 252 is rotatably installed at the other end of the tool holder 251, and the distance between the tool head of the turning tool 24 and the center axis of the machining hole 11 is smaller than the distance between the knurling tool wheel 252 and the center axis of the machining hole 11.

[0058] Further, as a preferred embodiment, a bidirectional screw 22 is arranged between the two tool holders 251 in the two groups of knurling tool assemblies 25, and the two tool holders 251 are threadedly installed on the outside of the bidirectional screw 22. When the bidirectional screw 22 rotates, the two tool holders 251 move closer or farther away.

[0059] More preferably, the bidirectional screw 22 penetrates the turning tool 24 to increase the strength of the turning tool 24 itself.

[0060] Further, as a preferred embodiment, handles 23 are installed at both ends of the bidirectional screw.

[0061] Further, as a preferred embodiment, a rectangular sliding groove 12 is arranged on the driving block 21 along the axial direction of the machining disc 1;

[0062] One end of each of the two knife holders 251 is provided with a rectangular sliding block 253 matched with the rectangular sliding groove 12, and the two rectangular sliding blocks are respectively slidably arranged on the two sides of the rectangular sliding groove 12. A scale 2531 is arranged on each of the rectangular sliding blocks 253 to facilitate accurate adjustment of the position of the plurality of knurling cutter assemblies 25 distributed in the same knurling section.

[0063] Further, as a preferred embodiment, a plurality of guide sliding grooves are arranged on the machining disc 1 in the radial direction and are in communication with the machining hole positions 11. A plurality of driving blocks 21 are slidably arranged in the plurality of guide sliding grooves.

[0064] Further, as a preferred embodiment, the driving mechanism 3 comprises a plurality of eccentric shafts 38, the plurality of eccentric shafts 38 are rotatably arranged on the machining disc 1 in the circumferential direction, and the outer part of each eccentric shaft 38 is eccentrically sleeved with a eccentric wheel 34. The outer part of each eccentric wheel 34 is coaxially sleeved with a driving ring 35. A plurality of first connecting rods 36 are arranged between the plurality of driving rings 35 and the plurality of driving blocks 21. One end of each of the plurality of first connecting rods 36 is connected with the outer circumferential surface of the plurality of driving rings 35, and the other end thereof is hingedly connected with the plurality of driving blocks 21.

[0065] One of the plurality of eccentric shafts 38 is a first eccentric shaft 38, the eccentric shaft 38 adjacent to the driving eccentric shaft 38 is a last eccentric shaft 38, and the plurality of eccentric shafts 38 between the last eccentric shaft 38 and the first eccentric shaft 38 are transmission eccentric shafts 38. The outer part of each of the transmission eccentric shafts 38 and the outer part of the first eccentric shaft 38 are connected with a V-shaped transmission frame 32. The middle part of the V-shaped transmission frame 32 is connected with the transmission eccentric shaft 38 / first eccentric shaft 38, and the last eccentric shaft 38 is connected with a transmission rod 37.

[0066] Among the two adjacent V-shaped transmission frames 32, and between the transmission rod 37 and the V-shaped transmission frame 32 on the transmission eccentric shaft 38 adjacent thereto, a curved rod 33 is hingedly connected.

[0067] The driving mechanism 3 further comprises a hydraulic oil cylinder 31, one end of which is hingedly connected with the machining disc 1, and the other end thereof is connected with one end of the V-shaped transmission frame 32 on the first eccentric shaft 38.

[0068] The driving mechanism 3 in the embodiment adopts the hydraulic oil cylinder 31 to convert the extension and retraction power of the hydraulic oil cylinder 31 into the rotating torque of the plurality of eccentric shafts 38 through the plurality of V-shaped transmission frames 32, the plurality of curved rods 33 and the transmission rod 37, and the plurality of eccentric shafts 38 drive the plurality of driving blocks 21 to slide radially inward or outward synchronously through the plurality of eccentric wheels 34, the plurality of driving rings 35 and the plurality of first connecting rods 36. The structure is ingenious, the manufacturing cost is low, the hydraulic oil cylinder 31 is used as a power source, parallel connecting rods and lever principle are combined for power transmission and output, and the power transmission stability is high.

[0069] The above merely describes the preferred embodiments of the present application, and does not limit the implementation and protection scope of the present application. It should be realized by those skilled in the art that any equivalent replacement and obvious change made according to the content of the present application should be included in the protection scope of the present application.

Claims

1. A knurling process of a knurling part using a knurling device, characterized by, The application relates to a knurling device and a knurling process. The knurling device comprises a processing disc, a plurality of knurling mechanisms and a driving mechanism, coaxial processing hole positions are arranged on the processing disc, the knurling mechanisms are distributed along the circumference of the processing disc, each knurling mechanism can slide along the radial direction of the processing disc, each knurling mechanism comprises a driving block and two groups of knurling cutter assemblies installed on the driving block, the driving block is slidably installed on the processing disc along the radial direction of the processing disc, the two groups of knurling cutter assemblies are distributed along the axial direction of the processing disc, and the spacing between the two groups of knurling cutter assemblies is adjustable, the driving mechanism is in transmission connection with the driving blocks, and is used for driving the driving blocks to synchronously slide along the radial direction of the processing disc outward or inward. Each knurling mechanism further comprises a turning tool, the turning tool is installed on the driving block and located at the middle position between the two knurling cutter assemblies, and the spacing between the tool head of the turning tool and the central axis of the processing hole position is smaller than the spacing between the knurling cutter assemblies and the central axis of the processing hole position. The two groups of knurling cutter assemblies are symmetrically distributed on the two sides of the driving block, each knurling cutter assembly comprises: a tool holder, one end of the tool holder is slidably installed on the driving block along the axial direction of the processing disc; a knurling cutter wheel, the knurling cutter wheel is rotationally installed on the other end of the tool holder, and the spacing between the tool head of the turning tool and the central axis of the processing hole position is smaller than the spacing between the knurling cutter wheel and the central axis of the processing hole position. The processing process comprises the following steps: S1: clamping a workpiece by a clamping mechanism and coaxially sending the workpiece to a predetermined position in the processing hole position of the processing disc; S2: adjusting the spacing between the two knurling cutter assemblies in each knurling mechanism according to the spacing between two knurling sections to be processed on the workpiece; S3: driving the workpiece to uniformly rotate by a motor; S4: driving the driving mechanisms to synchronously move radially inward, so that each group of knurling cutter assemblies is in rolling contact with the outer circumferential surface of the workpiece, so that two knurling sections are formed on the workpiece; S5: driving the driving mechanisms to synchronously move radially outward again, so that each group of knurling cutter assemblies is separated from the workpiece; S6: stopping the motor, releasing the clamping of the workpiece by the clamping mechanism, and taking down the workpiece.

2. The process for knurling a part as set forth in claim 1, wherein, A blowing mechanism is further installed on the processing disc, and the blowing mechanism is used for blowing away the waste generated during the processing of the workpiece.

3. The process for knurling a part as defined in claim 2, wherein, The blowing mechanism comprises a plurality of air jet heads, and the air jet heads are circumferentially installed on the inner wall of the processing hole position.

4. The process of claim 1 wherein, A bidirectional screw is arranged between the two tool holders of the two groups of knurling cutter assemblies, and the tool holders are threadedly installed on the outside of the bidirectional screw.

5. The process of claim 4 wherein, Handles are installed at the two ends of the bidirectional screw.

6. The process of claim 4 wherein, A rectangular sliding groove is arranged on the driving block along the axial direction of the processing disc; One end of each tool holder is provided with a rectangular sliding block matched with the rectangular sliding groove, and the rectangular sliding blocks are slidably installed on the two sides of the rectangular sliding groove, and a scale is arranged on each rectangular sliding block.

7. The knurled part machining process according to any one of claims 4-6, wherein, A plurality of guide sliding grooves in communication with the machining hole positions are arranged on the machining disc, and a plurality of driving blocks are respectively slidingly installed in the guide sliding grooves.

8. The process of claim 1 wherein, The driving mechanism comprises: A plurality of eccentric shafts are circumferentially rotatably installed on the machining disc, and an eccentric wheel is connected to the outer part of each eccentric shaft, and a driving ring is coaxially sleeved to the outer part of each eccentric wheel, a plurality of first connecting rods are arranged between the driving rings and the driving blocks, one end of each first connecting rod is connected to the outer circumferential surface of the driving ring, and the other end is hingedly connected to the driving block. One of the plurality of eccentric shafts is a first eccentric shaft, the eccentric shaft adjacent to the first eccentric shaft is a last eccentric shaft, the plurality of eccentric shafts between the last eccentric shaft and the first eccentric shaft are transmission eccentric shafts, the outer part of each transmission eccentric shaft and the outer part of the first eccentric shaft are connected to a V-shaped transmission frame, the middle part of the V-shaped transmission frame is connected to the transmission eccentric shaft / first eccentric shaft, and the last eccentric shaft is connected to a transmission rod. Between the two adjacent V-shaped transmission frames, the transmission rod and the V-shaped transmission frame on the transmission eccentric shaft adjacent to the transmission rod are hingedly connected to a curved rod. The driving mechanism further comprises a hydraulic oil cylinder, one end of the hydraulic oil cylinder is hingedly connected to the machining disc, and the other end is connected to one end of the V-shaped transmission frame on the first eccentric shaft.

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