High polymer material friction workpiece surface modification equipment and modification method

Abstract

The invention provides high polymer material friction workpiece surface modification equipment and a modification method. The device comprises a rack, a workpiece base, a rotary top disc, a metal probe, a pressurizing stand column, a particle filling head and a probe cleaning end. The upper end part of the metal probe is connected with a heating device; the rod body of the metal probe can drive the lower end micro-column body to move up and down and rotate simultaneously under the action of the movement device; a pit texture is machined on the surface of a high polymer material friction workpiece through a metal probe, solid ball particles are placed at the position, corresponding to the pit texture, of a particle filling head, finally, the solid ball particles are squeezed into the pit texture through a pressurization stand column, and the tops of the solid ball particles in pits are exposed out of the upper surfaces of the pits. And the roller can roll in the pit under the action of external force. According to the method, through the mode of combining heating and mechanical treatment, efficient machining of different high polymer material friction parts is achieved, the pit texture filled with particles is formed in the surface of the high polymer material friction parts, and the high polymer material friction parts with the obviously improved tribological performance can be obtained.

Description

Technical Field

[0001] The present invention relates to a friction surface modification device for polymer materials, and particularly to a surface modification device and a modification method for friction workpieces of polymer materials. Background Art

[0002] With the development of industrial technology, polymer materials represented by ABS, PC, PP, and PE are increasingly widely used in engineering fields such as automobiles and food equipment, and are gradually widely used in friction components in corrosive environments. However, due to the limitations of the characteristics of polymer materials themselves, their friction reduction and wear resistance performance have become a problem that needs to be urgently solved.

[0003] At present, the improvement of the tribological performance of polymer material friction components mainly starts from two aspects. On the one hand, a modifier is blended and then processed into corresponding friction components by extrusion or injection molding, etc. The improvement of its tribological performance is mainly achieved through the modifier. For example, polytetrafluoroethylene with better self-lubricating performance or PEEK with better wear resistance is added as a modifier. However, since the selection of the modifier is limited by the molding process, the optional range of the modifier is small, and the processing cost increases significantly. On the other hand, in recent years, the laser surface texturing technology used for surface modification of metal materials has begun to be applied to polymer material friction components, that is, the surface of polymer material friction components is directly textured and modified by laser, and the presence of surface texture is used to store wear debris or lubricating medium, so as to improve the surface tribological performance of polymer material friction components. However, the colors, light transmittances, and reflectivities of different polymer materials are different. For example, common transparent PC, gray PVC, and white ABS. Therefore, their laser treatment feasibility or processing efficiency is also different. For example, for transparent polymer materials, the absorption rate of most laser wavelengths is very low, and it is difficult to directly perform texturing treatment. It is necessary to specifically select ultraviolet laser and process it under low power and high frequency conditions; for highly reflective polymer materials, a high-power and low-frequency processing process is required to penetrate the reflective surface with laser energy, and then penetrate the laser energy. For the same material, different colors will also affect the light transmittance and reflectivity, and thus bring great challenges to both the type of laser and the processing technology. Therefore, the laser modification of polymer material friction components has many challenges and difficulties, so that it is necessary to continuously change the type of laser and the processing technology, and even some need to coat a specific material film layer on the surface before the surface texture can be processed. This makes the improvement of the tribological performance of many polymer material friction components complicated and difficult to achieve.

[0004] Therefore, it is necessary to develop a surface modification device for friction workpieces of polymer materials with wide applicability and high processing efficiency. Summary of the Invention

[0005] The object of the present invention is to provide a surface modification device and method for polymer material friction workpieces. Through the combination of heating and mechanical treatment, high-efficiency surface modification of different polymer material friction components is achieved, and a pit texture filled with particles is formed on its surface, obtaining polymer material friction components with significantly improved tribological properties.

[0006] A surface modification device for polymer material friction workpieces of the present invention adopts the following technical solutions: It includes a frame, a workpiece base, a rotating top plate, a metal probe, a pressurizing column, a particle filling head, and a probe cleaning end; the workpiece base is located at the bottom of the frame, the rotating top plate is located at the top of the frame, the metal probe, the particle filling head, and the pressurizing column are located below the rotating top plate. The rotating top plate drives the metal probe, the particle filling head, and the pressurizing column to rotate through a fixed rotation angle, and the ends of the metal probe, the particle filling head, and the pressurizing column reach the same position in sequence; the probe cleaning end is located on the side of the frame and realizes cleaning after contacting the end of the metal probe through telescopic movement; a heating device is connected to the upper end of the metal probe, and the lower end of the metal probe is a micro-cylinder with a thick middle and thin ends; an insulating tube and a motion device are arranged outside the rod body of the metal probe, and the rod body of the metal probe can drive the lower-end micro-cylinder to move up and down and rotate simultaneously under the action of the motion device; a workpiece moving table capable of moving in the horizontal plane is arranged on the workpiece base, a workpiece fixing fixture is arranged on the workpiece moving table, and a rotating component is also arranged below the workpiece moving table; the workpiece base is also provided with a finishing cutter head for cleaning burrs, protrusions and other polymer materials formed on the edge of the pit during the preparation of the pit texture; a pit texture is processed on the surface of the polymer material friction workpiece by the metal probe, solid spherical particles are placed at the corresponding position of the pit texture by the particle filling head, and finally the solid spherical particles are squeezed into the pit texture by the pressurizing column. The top of the solid spherical particles in the pit exposes the upper surface of the pit and can roll in the pit under the action of an external force.

[0007] The device further includes a controller, which is electrically connected to the workpiece base and the rotating top plate respectively, and is used to control the movement of the workpiece base, the rotation of the rotating top plate, the heating and movement of the metal probe, the movement of the particle filling head, and the movement of the pressurizing column.

[0008] The particle filling head is a hollow tube filled with solid spherical particles, and an extrusion column is arranged at the upper part of the hollow tube, which can extrude the solid spherical particles from the end of the particle filling head.

[0009] The solid spherical particles are one of polytetrafluoroethylene balls, PEEK balls, graphite balls, molybdenum disulfide balls, stainless steel balls, or silicon carbide balls.

[0010] The finishing cutter head cuts and finishes the surface of the polymer material friction workpiece by high-speed rotation.

[0011] The micro-cylinder at the lower end of the metal probe is a sphere, and the outer diameter of the cross-section ranges from 500 to 1000 microns.

[0012] The minimum dimension of the upper part of the cross-section of the micro-cylinder at the lower end of the metal probe is larger than that of the lower part.

[0013] A modification method for a surface modification device of a polymer material friction workpiece includes the following steps: Step 1: Fix the polymer material friction workpiece to the workpiece moving table and move it below the rotating top plate. Step 2: Move the metal probe downward to the surface of the polymer material friction workpiece. Based on the material characteristics of the polymer material friction workpiece, heat the metal probe to the melting point of the polymer material, then quickly rotate downward and then quickly lift upward. Using high-temperature deformation, form a pit on the surface of the polymer material friction workpiece with an internal dimension larger than the mouth dimension. For the surface of a thin-plate type polymer material friction workpiece that is easily deformed by heat, the preparation of the pit adopts an intermittent processing method instead of the adjacent pit sequential processing method. Step 3: The finishing tool shears and removes the polymer material protruding from the upper part of the pit. The heat-conducting plate is placed at the upper end of the pit processed by the finishing tool, and the material at the mouth of the pit is leveled and solidified through heating and extrusion. Step 4: Rotate the rotating top plate to make the particle filling head located above the pit. Corresponding to the selection, the outer diameter of the solid ball particle is smaller than the maximum diameter of the cross-section of the corresponding pit. Extrude a solid ball particle from the end of the particle filling head and place it at the mouth position of the pit. Step 5: Rotate the rotating top plate to make the pressurizing column located above the mouth of the pit. The end of the pressurizing column quickly impacts and extrudes downward, squeezing the solid ball particle into the pit, so that the top of the solid ball particle protrudes from the pit and can roll in the pit. Step 6: The controller controls the movement of the workpiece base and the rotating top plate, continuously adjusts the position of the workpiece base according to the setting, and repeats steps 2 to 5 to obtain a polymer material friction workpiece with a pit texture and solid ball particle filling on the surface.

[0014] By adjusting the movement and rotation of the workpiece base through the controller, the modification processing of the curved surface polymer material friction workpiece is realized.

[0015] All the pit textures on the surface of the polymer material friction workpiece are filled with solid ball particles or only some of the pit textures are filled with solid ball particles.

[0016] The technical solution of the surface modification device and modification method for a polymer material friction workpiece of the present invention has the following advantages compared with the prior art: First, in the technical solution of the present invention, through the design of the metal probe, efficient processing of friction parts made of different polymer materials can be achieved without considering the color, light transmittance and light reflectivity of the polymer material, and the desired pit texture can be successfully prepared on its surface. The metal probe has good thermal conductivity. The upper end of the metal probe is connected to a heating device, and the micro-column at the lower end of the metal probe is heated to the temperature of its melting point. Then, the high temperature is used to quickly form a pit texture on the surface of the polymer friction part, and the heating temperature can be adjusted based on the melting point of different polymer materials, ultimately achieving efficient processing of pit textures on the surface of different polymer materials.

[0017] Second, in the technical solution of the present invention, the design of the specific structure of the pressurized column and the particle filling head cooperates with the metal probe, so that the surface of the polymer material friction component can obtain a pit texture with a large interior and a small mouth, thereby realizing the filling of different friction-reducing and wear-resistant ball particles in the pit, and realizing the rolling of the filled ball particles in the pit texture. The design of the micro-column at the lower end of the metal probe defines a structure that is thick in the middle and thin at both ends, thereby obtaining a pit with a small mouth and a large interior; and the cooperation of the specific structure of the pressurized column and the particle filling head enables different friction-reducing and wear-resistant ball particles to be filled in the pit, and further by selecting the size of the ball particles to be smaller than the maximum diameter of the corresponding pit cross section, but larger than the pit mouth diameter, the top of the ball particles is exposed from the pit and the whole is confined in the pit, and the filling ball particles can be rolled in the pit under the action of external force, thereby realizing the improvement of friction and wear of the friction component during service.

[0018] Third, in the technical solution of the present invention, the methods of heating the metal probe to prepare the surface pit texture, finishing the pit texture mouth, squeezing the solid ball particles, and driving the workpiece surface movement by the workpiece base are adopted to realize the efficient processing of the surface pit texture of friction parts of different polymer materials. The heated metal probe can realize the rapid formation of the pit texture, and the polymer material protrusions and burrs brought out by the metal probe are prepared by the finishing cutter head, and the pit mouth is further finished and flattened by the heat conducting plate, finally ensuring the formation of a pit structure with a small mouth and a large interior; combined with the selection and squeezing of the solid ball particle size, the rolling ball particles inside the pit are squeezed in, so that the ball particles are confined in the pit and will not fall out, and wear-resistant and / or friction-reducing ball particles of various materials can be selected according to needs, further realizing the significant improvement of its tribological properties. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic diagram of the overall structure of the surface modification device of the present invention; Figure 2 It is a structural schematic diagram of the rotating top plate of the present invention; Figure 3Schematic structural diagram of the metal probe of the present invention; Figure 4 Schematic structural diagram of the particle filling head of the present invention; Figure 5 Schematic diagram of the surface modification process of the polymer material friction workpiece of the present invention; Figure 6 Schematic structural diagram of the surface of the polymer material friction workpiece after surface modification of the present invention; Figure 7 Another schematic structural diagram of the cross-section of the polymer material friction workpiece after surface modification of the present invention; Figure 8 Schematic structural diagram of the finishing tool head of the present invention; Figure 9 Another schematic structural diagram of the micro-column of the metal probe of the present invention. Specific embodiments

[0020] See Figures 1-9 , a surface modification device for polymer material friction workpieces, comprising a frame 1, the frame 1 is a three-dimensional frame steel structure, a workpiece base 2, a rotating top plate 3, a metal probe 4, a pressurizing column 5, a particle filling head 6, and a probe cleaning end 7.

[0021] See Figure 1 , the workpiece base 2 is located at the bottom of the frame 1; the rotating top plate 3 is located at the top of the frame 1, and the metal probe 4, the particle filling head 6, and the pressurizing column 5 are located below the rotating top plate 3; preferably, see Figure 2 , the metal probe 4, the particle filling head 6, and the pressurizing column 5 are evenly distributed on the same circumferential line in sequence. Further preferably, the rotating top plate 3 can drive the metal probe, the particle filling head, and the pressurizing column to rotate by 120 degrees respectively, and make the ends of the metal probe, the particle filling head, and the pressurizing column reach the same position in sequence, so as to perform corresponding operation and treatment on the same position point of the workpiece surface in sequence.

[0022] The upper end of the metal probe 4 is connected with a heating device. Preferably, the heating device is an energized thermocouple. The lower end of the metal probe is a micro-column with a thick middle and thin ends. The micro-column is the key component for directly processing the concave pits on the workpiece surface. The micro-column with a thick middle and thin ends can make the workpiece surface obtain a spherical concave pit texture, and when the metal probe is lifted, the polymer material shows a necking effect at the mouth of the concave pit, so that the size of the mouth of the concave pit is smaller than the maximum size inside the concave pit, preparing for the solid spherical particles not to fall out after filling the solid spherical particles in the later stage. See Figure 3, an insulating tube 41 and a motion device 42 are provided outside the rod body of the metal probe. The insulating tube is located on the outermost side of the rod body of the metal probe and is used to protect the metal probe to transfer heat efficiently to the end of the metal probe when heated, improving the heating efficiency; the rod body of the metal probe can drive the micro-cylinder at the lower end to move up and down and rotate simultaneously under the action of the motion device. The motion device is located at the top of the metal probe and realizes the efficient adjustment of its motion and motion speed through existing mature mechanical structures such as screws.

[0023] The probe cleaning end 7 is located on the side of the frame 1 and realizes cleaning after contacting the end of the metal probe through telescopic motion. Preferably, the probe cleaning end 7 further includes a friction sleeve. During the cleaning process, after the metal probe is heated, the polymer material adhered to the surface of the end is melted, and the friction sleeve is used to frictionally remove the polymer material adhered to the surface of the end, so that the surface size of the end of the metal probe is not affected.

[0024] A workpiece moving table 21 capable of moving in a horizontal plane is provided on the workpiece base. A workpiece fixing fixture is provided on the workpiece moving table 21 for installing and fixing the polymer material friction workpiece 10. A rotating component is further provided below the workpiece moving table 21. The moving and rotating structures of the workpiece moving table adopt common mechanical structures such as sliding rails, hydraulic mechanisms or rotating shaft structures; the workpiece base is also provided with a finishing cutter head 22, and the finishing cutter head 22 is used to clean the polymer material protrusions and burrs brought out at the mouth of the concave pit when the end of the metal probe is disengaged from the concave pit on the workpiece surface; the workpiece base is also provided with a heat-conducting plate that can cover the mouth of the concave pit. The heat-conducting plate quickly realizes the deformation and flattening of the convex polymer material at the mouth of the concave pit through heating, so that the edge of the mouth of the concave pit is in the same plane as the surrounding surface; by processing a concave pit texture on the surface of the polymer material friction workpiece 10 with the metal probe, the particle filling head places solid spherical particles 61 at the corresponding positions of the concave pit texture, and finally the pressurizing column 5 squeezes the solid spherical particles into the concave pit texture. The top of the solid spherical particles in the concave pit exposes the upper surface of the concave pit and can roll in the concave pit under the action of an external force. Repeating the above operations continuously according to the set path can complete the surface modification of different polymer material friction workpieces.

[0025] Further, the device further includes a controller connected to the microcomputer. The controller is provided on the side of the device. The controller is electrically connected to the workpiece base and the rotating top plate respectively. By inputting instructions through the microcomputer, the controller controls the opening and stopping of each component on the workpiece base and the rotating top plate, and is used to control the motion of the workpiece base, the rotation of the rotating top plate, the heating and motion of the metal probe, the motion of the particle filling head and the motion of the pressurizing column, as well as various operations during the operation of the entire device.

[0026] See Figure 4, the particle filling head is a hollow tube filled with solid spherical particles 61 inside. An extrusion column 62 is provided at the upper part of the hollow tube, which can extrude the solid spherical particles from the end of the particle filling head. An anhydrous ethanol droplet supply port is also provided at the lower end of the hollow tube. After mixing the extruded solid spherical particles and anhydrous ethanol droplets, they adhere to the mouth of the concave pit on the surface of the corresponding workpiece.

[0027] For the solid spherical particles filled inside the hollow tube of the particle filling head, according to the modification requirements of the workpiece, solid spherical particles with anti-friction function, or wear-resistant function, or solid spherical particles with both modeling and wear-resistant functions can be selected. Further, the solid spherical particles are one of polytetrafluoroethylene balls, PEEK balls, graphite balls, molybdenum disulfide balls, stainless steel balls, or silicon carbide balls. The outer diameter size of the solid spherical particles is determined in advance according to the preset concave pit size. Compared with the maximum outer diameter size of the concave pit cross-section, the outer diameter of the solid spherical particles is reduced by 100 - 200 microns. After determination, they are filled into the hollow tube of the particle filling head, or directly select the hollow tube already filled with solid spherical particles of different size according to needs.

[0028] The finishing tool head cuts and finishes the surface of the polymer material friction workpiece by rotating at high speed. See Figure 8 , preferably, the finishing tool head uses a high-speed rotating sheet-like tool head 220, which is moved above the position on the workpiece surface to be processed to quickly cut the protrusions and burrs on the surface of the concave pit.

[0029] Preferably, see Figure 3 , the micro-column at the lower end of the metal probe is a sphere, and the outer diameter range of the sphere is 500 - 1000 microns. Further preferably, the outer diameter of the sphere is 500 microns, or 600 microns, or 700 microns, or 800 microns, or 900 microns, or 1000 microns.

[0030] Further, see Figure 9 , the micro-column of the metal probe is preferably an ellipsoid, so that during the processing, a concave pit with an internal cross-sectional diameter larger than the mouth cross-sectional diameter can be formed, and the design with the largest middle cross-section and gradually shrinking bottom can be utilized. When the metal probe micro-column is extracted upward from the prepared concave pit, the polymer material at the edge of the concave pit can rely on the shape of the metal probe micro-column to form a constricted mouth, and then form a concave pit shape with a large internal mouth and a small bottom.

[0031] Taking the ABS polymer material with a melting point of 170°C - 200°C, which is commonly used in the field of automotive transmission, as an example of the friction workpiece, the modification method of the polymer material friction workpiece surface modification equipment of the present invention is described as follows, including the following steps: Step 1, see Figure 5(a)Fix the ABS polymer material friction workpiece to the workpiece moving table and, under the control of a microcomputer, move it under the rotating top plate; Step 2: The micro-column at the lower end of the metal probe is a sphere, and the outer diameter of the sphere is selected to be 800 microns. The metal probe moves downward to the surface of the ABS polymer material friction workpiece. After heating the metal probe to 180°C, which is the melting point temperature of the metal probe, the moving device drives the micro-column at the lower end of the metal probe to rotate rapidly downward. After pressing into the set depth on the surface of the ABS workpiece, it is quickly lifted upward. During the whole process, the metal probe remains in a rotating state, forming a pit 101 on the surface of the polymer material friction workpiece with an internal size larger than the mouth size, and forming a polymer material bulge and burr 102 brought out upward by the lifted metal probe at the mouth of the pit 101. See Figure 5 (b); Step 3: Move the blade head 220 of the finishing tool head 22 above the pit from the previous step, and use the rapidly rotating blade head 220 to shear and remove the polymer material 102 protruding from the upper part of the pit to obtain a relatively flat mouth 103. See Figure 5 (c)Place the heat-conducting plate on the surface of the mouth 103 at the upper end of the pit processed by the finishing tool head; achieve the material leveling at the mouth of the pit through heating and extrusion to obtain the pit edge 104. See Figure 5 (d)After further curing, finally obtain a pit 101 with the maximum cross-sectional size of 800 microns inside the pit, a mouth size of 400 - 500 microns, and a flat pit consistent with the surrounding surface; Step 4: Under the drive of the controller, rotate the rotating top plate to make the particle filling head 6 located above the pit 101. Correspondingly, select the solid spherical particle 61 as a polytetrafluoroethylene ball with an outer diameter of 650 - 700 microns. Extrude a polytetrafluoroethylene ball from the end of the particle filling head 6, and use the ethanol droplet supply port at the lower end of the hollow tube of the particle filling head 6 to extrude ethanol droplets to adhere the polytetrafluoroethylene ball to the position above the mouth of the pit 101. Since the outer diameter of the polytetrafluoroethylene ball is larger than the mouth size of the pit 101, the polytetrafluoroethylene ball cannot enter the pit 101 at this time. See Figure 5 (e); Step 5: Rotate the rotating top plate 3 again to make the pressing column 5 located above the mouth of the pit 101. The end of the pressing column 5 impacts and extrudes downward rapidly. Utilizing the characteristics that there is less polymer material at the mouth of the pit 101 and it is easy to deform, squeeze the solid spherical particle 61 (polytetrafluoroethylene ball) into the pit 101. See Figure 5(f) The top of the solid ball particle 61 is exposed from the pit 101. The outer diameter of the solid ball particle 61 is smaller than the maximum outer diameter of the cross section of the pit 101. The gap between the solid ball particle 61 and the pit 101 allows the solid ball particle 61 to roll in the pit 101, thereby forming a rolling effect between the friction surface of the grinding pair during the service of the workpiece, and the surface of the polytetrafluoroethylene ball can be adhered to the surface of the grinding pair to achieve effective lubrication at other positions.

[0032] Step 6, the controller controls the movement of the workpiece base 2 and the rotating top plate 3, continuously adjusts the position of the workpiece base according to the setting, and repeats steps 2 to 5 to obtain a polymer material friction workpiece 10 with a pit texture and solid ball particles filled on the surface, see Figure 6 For further information, see Figure 7 For some working conditions with a lot of wear debris, a structure in which only a certain proportion of solid spherical particles are filled in the pit texture can be used, leaving the remaining pit texture in an unfilled state, so as to more efficiently collect wear debris and improve wear.

[0033] Furthermore, for the surface of thin plate-like polymer material friction workpieces that are easily deformed by heat, the conventional method of processing adjacent pits in sequence is no longer used. This will cause the surface to be heated too concentratedly in a short period of time, resulting in local thermal deformation. In this case, the preparation of the pits is replaced by an interval processing method. That is, after preparing a small area or a row or column of pit textures, the pit texture is moved to a farther distance to prepare the corresponding position. After the front texture area is cooled, it is moved back to prepare the texture at the adjacent position. The thermal deformation problem is solved by alternating interval processing.

[0034] For a polymer material friction workpiece with a curved surface, modification processing can be achieved by adjusting the movement and rotation of the workpiece base through a controller.

[0035] When all or part of the pit texture on the surface of a polymer material friction workpiece is filled with solid spherical particles, the texture itself can be used to collect wear debris and store lubricating media in combination with the solid spherical particles filled in part of the pit texture to further improve the tribological properties of the polymer material friction workpiece.

Claims

1. A surface modification device for friction of polymer materials on workpieces, characterized in that It includes a frame, a workpiece base, a rotating top plate, a metal probe, a pressurizing column, a particle filling head, and a probe cleaning end; The workpiece base is located at the bottom of the frame, the rotating top plate is located at the top of the frame, the metal probe, the particle filling head, and the pressurizing column are located below the rotating top plate. The rotating top plate drives the metal probe, the particle filling head, and the pressurizing column to rotate by a fixed angle, and makes the ends of the metal probe, the particle filling head, and the pressurizing column reach the same position in sequence. A heating device is connected to the upper end of the metal probe, and the lower end of the metal probe is a micro-column with a thick middle and thin ends. An insulating tube and a motion device are arranged outside the rod body of the metal probe, and the rod body of the metal probe can drive the lower micro-column to move up and down and rotate simultaneously under the action of the motion device. A workpiece moving table that can move in the horizontal plane is arranged on the workpiece base, a workpiece fixing fixture is arranged on the workpiece moving table, and a rotating component is also arranged at the lower part of the workpiece moving table. The workpiece base is also provided with a finishing cutter head. By using the metal probe to process a pit texture on the surface of the workpiece rubbed by the polymer material, the particle filling head places solid spherical particles at the corresponding position of the pit texture, and finally the pressurizing column squeezes the solid spherical particles into the pit texture. The top of the solid spherical particles in the pit exposes the upper surface of the pit and can roll in the pit under the action of an external force.

2. The surface modification device for a polymer material friction workpiece according to claim 1, characterized in that, The device also includes a controller, which is electrically connected to the workpiece base and the rotating top plate respectively, and is used to control the movement of the workpiece base, the rotation of the rotating top plate, the heating and movement of the metal probe, the movement of the particle filling head, and the movement of the pressurizing column.

3. A surface modification device for friction workpieces of a polymer material according to claim 1, characterized in that, The particle filling head is a hollow tube, and solid spherical particles are filled in the hollow tube. An extrusion column is arranged at the upper part of the hollow tube, which can extrude the solid spherical particles from the end of the particle filling head.

4. The surface modification device for friction workpieces of a polymer material according to claim 3, characterized in that, The solid spherical particles are one of polytetrafluoroethylene balls, PEEK balls, graphite balls, molybdenum disulfide balls, stainless steel balls, or silicon carbide balls.

5. The surface modification device for a polymer material friction workpiece according to claim 1, characterized in that, The finishing cutter head cuts and finishes the surface of the workpiece rubbed by the polymer material by high-speed rotation.

6. The surface modification device for a friction workpiece of a polymer material according to claim 1, characterized in that, The micro-column at the lower end of the metal probe is a sphere.

7. The surface modification device for a polymer material friction workpiece according to claim 6, characterized in that, The probe cleaning end is located on the side of the frame and realizes cleaning after contacting the end of the metal probe through telescopic movement.

8. The modification method of any of the high polymer material friction workpiece surface modification devices described in claims 1-7, characterized in that, It includes the following steps: Step 1, fix the workpiece rubbed by the polymer material to the workpiece moving table and move it below the rotating top plate; Step 2, the metal probe moves downward to the surface of the workpiece rubbed by the polymer material. Based on the material characteristics of the workpiece rubbed by the polymer material, the metal probe is heated and then quickly rotated downward and then quickly lifted upward to form a pit with an internal size larger than the mouth size on the surface of the workpiece rubbed by the polymer material; Step 3, the finishing cutter head shears and removes the polymer material protruding from the upper part of the pit; a heat conducting plate is placed at the upper end of the pit processed by the finishing cutter head, and the material at the mouth of the pit is leveled and cured through heating and extrusion; Step 4, by rotating the rotating top plate, make the particle filling head located above the pit. Correspondingly, select that the outer diameter of the solid spherical particle is smaller than the maximum diameter of the cross-section of the corresponding pit, and extrude a solid spherical particle from the end of the particle filling head and place it at the mouth position of the pit; Step 5: By rotating the rotary top disc, the pressurizing column is positioned above the mouth of the pit. The end of the pressurizing column rapidly impacts and extrudes downward, squeezing the solid spherical particles into the pit, causing the top of the solid spherical particles to protrude from the pit and enabling them to roll in the pit. Step 6: The controller controls the movements of the workpiece base and the rotary top disc, continuously adjusts the position of the workpiece base according to the setting, and repeats Step 2 - Step 5 to obtain a polymer material friction workpiece with a pit texture on the surface and solid spherical particles filled in.

9. The modification method according to claim 8, wherein The movement and rotation of the workpiece base are adjusted by the controller to achieve the modification processing of the curved surface polymer material friction workpiece.

10. The modification method according to claim 8, wherein In Step 2, for the surface of the polymer material friction workpiece of the thin plate type that is prone to heat deformation, the preparation of the pits adopts an intermittent processing method instead of the sequential processing method of adjacent pits.

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