Eccentric shell polishing and grinding equipment and method

Abstract

The invention relates to polishing and grinding equipment and method, in particular to eccentric shell polishing and grinding equipment and method. An XYZ three-axis linear module is arranged on the rack, and a polishing and grinding head is arranged on the XYZ three-axis linear module; a Z-axis lifting linear module is arranged on the rack, and a smoothness measuring instrument is arranged on the Z-axis lifting linear module; a rotating disc is arranged in the middle of the workbench, and a three-equal-part graduator is arranged at the bottom of the rotating disc and fixed to the top of the rack. The top of the rotating disc is provided with three rotation assemblies which are evenly distributed in the circumferential direction, the tops of the rotation assemblies are provided with eccentricity correction tools, and the eccentric shell is installed in the eccentricity correction tools. The polishing head and the smoothness measuring instrument can extend into the eccentric hole of the eccentric shell; and compared with a traditional mode that a numerical control machine tool and a wool wheel are combined for polishing and grinding, the controllability of the polishing and grinding quality can be ensured, and the stability of the polishing and grinding quality of the eccentric hole of the eccentric shell can also be remarkably improved.

Description

Technical Field

[0001] The present invention relates to polishing and grinding equipment and methods, and particularly to an eccentric housing polishing and grinding equipment and method. Background Art

[0002] Polishing and grinding refer to a processing method that uses mechanical, chemical, or electrochemical means to reduce the surface roughness of a workpiece, thereby obtaining a bright and flat surface. This processing method mainly uses polishing tools and abrasive particles or other polishing media to modify the surface of the workpiece. The main purpose of polishing and grinding is not to improve the dimensional accuracy or geometric shape accuracy of the workpiece, but to focus on obtaining a smooth surface or mirror finish.

[0003] Among traditional polishing and grinding tools, the polishing wheel is one of the commonly used tools. When polishing and grinding the grinding hole positions on the housing, a combination of a numerically controlled machine tool and a wool wheel (a type of polishing wheel) is often used. The wool wheel is widely used because of its soft material and relatively low cost. However, during the polishing and grinding process, if the spindle speed of the numerically controlled machine tool is too fast, the wool wheel is prone to catching fire, which may not only damage the workpiece but also pose a safety hazard to the working environment.

[0004] In addition, as a consumable, the wool wheel will gradually wear during use. However, due to the lack of accurate evaluation means, it is difficult to accurately determine when the wool wheel needs to be replaced. This problem of poor controllability often leads to unstable polishing and grinding effects, affecting the final quality of the workpiece. Summary of the Invention

[0005] The purpose of the present invention is to solve the technical problems of poor controllability of the existing grinding method and unstable polishing and grinding effects, and to provide an eccentric housing polishing and grinding equipment and method.

[0006] To solve the above technical problems, the technical solution provided by the present invention is as follows: An eccentric housing polishing and grinding equipment, comprising a frame, and a workbench located inside the frame. The workbench is divided into three equal parts: a loading and unloading station, a polishing and grinding station, and a surface finish measurement station; On the frame above the polishing and grinding station, an XYZ three-axis linear module is provided. A polishing and grinding head is provided on the slide table of the Z-axis linear module in the XYZ three-axis linear module. On the frame above the surface finish measurement station, a Z-axis lifting linear module is provided. A surface finish measuring instrument is provided on the slide table of the Z-axis lifting linear module; A rotating disk is provided in the middle of the workbench. A three-way divider is provided at the bottom of the rotating disk, and the three-way divider is fixed to the top of the frame; Three self-rotating components evenly distributed in a circle are provided at the top of the rotating disk. An eccentric correction tooling is provided at the top of the self-rotating component, and the eccentric housing is installed in the eccentric correction tooling; the polishing and grinding head and the surface finish measuring instrument can both extend into the eccentric hole of the eccentric housing; An industrial control computer located at the bottom of the workbench, as well as a polishing and grinding system, a surface finish measuring system and a PLC controller connected to the industrial control computer, are installed in the frame; among them, the PLC controller is connected to the XYZ three-axis linear module, the Z-axis lifting linear module and the self-rotating component; the polishing and grinding head is connected to the polishing and grinding system, and the surface finish measuring instrument is connected to the surface finish measuring system.

[0007] Further, the self-rotating component includes a stepping motor located at the bottom of the rotating disk, and the stepping motor is connected to the PLC controller; The output shaft of the stepping motor penetrates through the rotating disk and is provided with a coupling, and the top of the coupling is connected to the eccentric correction tooling; A thrust bearing is provided between the bottom of the eccentric correction tooling and the rotating disk, and the thrust bearing is fixed to the rotating disk through a bearing seat.

[0008] Further, the eccentric correction tooling includes an eccentric fixing shell, and a stepped mounting hole is opened on the eccentric fixing shell; The eccentric housing is fixedly installed in the stepped mounting hole of the eccentric fixing shell through screws, and the central axis of the eccentric hole of the eccentric housing coincides with the central axis of the eccentric fixing shell; A plurality of center of gravity adjustment holes are opened at the top of the eccentric fixing shell.

[0009] Further, a plurality of mounting grooves evenly distributed in a circle are opened on the workbench, and electric cylinders are installed in the mounting grooves; The output shaft of the electric cylinder points to the center of the rotating disk, and a positioning member adapted to the output shaft of the electric cylinder is provided on the rotating disk.

[0010] Further, the positioning member includes two screw rods, the two screw rods are respectively fixed on both sides of the output shaft of the electric cylinder, and a rotating sleeve is rotatably installed at the top of the screw rod, and the outer side wall of the rotating sleeve is attached to the output shaft of the electric cylinder.

[0011] Further, a coolant tank is provided in the frame, a circulation pump is provided in the coolant tank, and the liquid outlet of the circulation pump is connected to the coolant interface of the polishing and grinding head through a liquid delivery pipeline; An annular coolant diversion groove is opened on the workbench, and the coolant diversion groove is communicated with the coolant tank through a coolant collection pipeline.

[0012] A method for polishing and grinding an eccentric housing includes the following steps: S1. Install the eccentric housing into the eccentric correction tooling at the loading and unloading station; S2. Set the polishing and grinding parameters and the surface finish measurement parameters through the industrial control computer, and send them to the polishing and grinding system and the surface finish measurement system respectively; S3. Control the three - equal - part indexer to rotate through the PLC controller, and rotate the eccentric housing from the loading and unloading station to the polishing and grinding station; S4. Control the self - rotation component to drive the eccentric correction tooling to rotate by the PLC controller; Start the polishing and grinding head. At the same time, the PLC controller controls the Z - axis linear module in the XYZ three - axis linear module to move downward along the Z - axis, so that the polishing and grinding head polishes and grinds the inner wall of the eccentric hole; After the polishing and grinding are completed, the self - rotation component and the polishing and grinding head stop working, and the polishing and grinding head withdraws from the eccentric hole; S5. Control the three - equal - part indexer to rotate through the PLC controller, and rotate the eccentric housing from the polishing and grinding station to the surface finish measurement station; S6. Start the surface finish measuring instrument. At the same time, the PLC controller controls the Z - axis lifting linear module to move downward along the Z - axis, so that the surface finish measuring instrument extends into the eccentric hole. The surface finish measuring instrument detects the surface finish of the inner wall of the eccentric hole and collects the surface finish data of the eccentric hole; After the collection is completed, the surface finish measuring instrument withdraws from the eccentric hole and sends the surface finish data to the surface finish measurement system; S7. The surface finish measurement system compares the surface finish data with the surface finish standard data; If the surface finish data is not within the threshold range, control the three - equal - part indexer to rotate in the reverse direction through the PLC controller, rotate the eccentric housing from the surface finish measurement station to the polishing and grinding station, and re - execute step S4; If the surface finish data is within the threshold range, the surface finish measuring instrument stops working and withdraws from the eccentric hole, and execute step S8; S8. Control the three - equal - part indexer to rotate through the PLC controller, rotate the eccentric housing from the surface finish measurement station to the loading and unloading station. After taking out the polished and ground eccentric housing, the polishing and grinding of the eccentric housing is completed.

[0013] Compared with the prior art, the beneficial effects of the present invention: The eccentric housing polishing and grinding equipment and method provided by the present invention realize a complete process flow from loading to polishing and grinding, surface finish measurement, and then to unloading by setting up loading and unloading stations, polishing and grinding stations, and surface finish measurement stations, and combining with a rotating disk and a three-way divider. After the polishing and grinding process is completed, the surface finish measurement is immediately carried out, which can detect the quality of polishing and grinding in real time; if the detection result shows that the quality of polishing and grinding does not meet the standard, the eccentric housing can be sent back to the polishing and grinding station again through the three-way divider for re-polishing and grinding until the specified requirements are met; compared with the traditional method of polishing and grinding using a numerical control machine tool and a wool wheel combination, the present invention can not only ensure the controllability of the polishing and grinding quality, but also significantly improve the stability of the polishing and grinding quality of the eccentric hole of the eccentric housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 is a schematic structural diagram of an embodiment of the present invention; Figure 2 is a schematic structural diagram of the embodiment of the present invention after removing the guard plate; Figure 3 is a schematic structural diagram of the XYZ three-axis linear module and the polishing and grinding head in the embodiment of the present invention; Figure 4 is a schematic structural diagram of the Z-axis lifting linear module and the surface finish measuring instrument in the embodiment of the present invention; Figure 5 is a schematic structural diagram of the workbench, rotating disk, self-rotation component and three-way divider in the embodiment of the present invention; Figure 6 is a schematic structural diagram of the self-rotation component and the eccentric correction tooling on the rotating disk in the embodiment of the present invention; Figure 7 is Figure 6 a sectional structural diagram of; Figure 8 is a schematic structural diagram of the eccentric correction tooling in the embodiment of the present invention.

[0015] DESCRIPTION OF REFERENCE NUMERALS: 1 - frame, 2 - workbench, 3 - XYZ three-axis linear module, 4 - polishing and grinding head, 5 - Z-axis lifting linear module, 6 - surface finish measuring instrument, 7 - rotating disk, 8 - three-way divider, 9 - self-rotation component, 91 - stepping motor, 92 - coupling, 93 - thrust bearing, 94 - bearing seat, 10 - eccentric correction tooling, 101 - eccentric fixing shell, 102 - stepped mounting hole, 103 - center of gravity adjustment hole, 11 - eccentric housing, 12 - electric cylinder, 13 - screw, 14 - rotating sleeve, 15 - coolant diversion groove. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0016] The technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings. Apparently, the described embodiments are only a part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0017] As Figure 1 and Figure 2 shown, an eccentric housing polishing and grinding device includes a frame 1 and a workbench 2 located inside the frame 1. In order to achieve semi-automatic polishing, grinding and surface finish measurement, the workbench 2 is divided into three equal parts: a loading and unloading station, a polishing and grinding station, and a surface finish measurement station; As Figure 2 shown, in order to enable the polishing and grinding head 4 to be more accurately positioned at the polishing and grinding position, that is, the polishing and grinding head 4 can accurately extend into the eccentric hole of the eccentric housing 11, an XYZ three-axis linear module 3 is provided on the frame 1 above the polishing and grinding station. As Figure 3 shown, a polishing and grinding head 4 is provided on the slide table of the Z-axis linear module in the XYZ three-axis linear module 3; the positioning of the polishing and grinding head 4 and the eccentric hole is achieved through the X-axis linear module and the Y-axis linear module, and the polishing and grinding in the depth direction of the eccentric hole is achieved by using the Z-axis linear module.

[0018] As Figure 2 shown, in order to enable the surface finish measuring instrument 6 to detect the inner wall surface finish of the eccentric hole and ensure that the surface finish measuring instrument 6 extends into the eccentric hole of the eccentric housing 11, a Z-axis lifting linear module 5 is provided on the frame 1 above the surface finish measurement station. As Figure 4 shown, a surface finish measuring instrument 6 is provided on the slide table of the Z-axis lifting linear module 5; the surface finish measuring instrument 6 is a surface roughness measuring instrument.

[0019] As Figure 2 and Figure 5 shown, in order to realize the switching of the eccentric housing 11 among the loading and unloading station, the polishing and grinding station, and the surface finish measurement station, a rotating disk 7 is provided in the middle of the workbench 2, and a three-equal-part indexer 8 is provided at the bottom of the rotating disk 7. The three-equal-part indexer 8 is fixed to the top of the frame 1, and the rotating disk 7 is driven by the three-equal-part indexer 8 to rotate 120° each time on the workbench 2.

[0020] As Figure 5 shown, since the polishing and grinding head 4 does not rotate, in order to realize the polishing and grinding of the inner wall of the eccentric hole of the eccentric housing 11, three circumferentially evenly distributed self-rotating components 9 are provided on the top of the rotating disk 7. As Figure 6 and Figure 7As shown in the figure, an eccentric correction tooling 10 is provided at the top of the rotation assembly 9; the rotation assembly 9 includes a stepping motor 91 located at the bottom of the rotating disk 7; the output shaft of the stepping motor 91 penetrates through the rotating disk 7 and is provided with a coupling 92, and the top of the coupling 92 is connected to the eccentric correction tooling 10; in order to reduce the friction between the bottom of the eccentric correction tooling 10 and the rotating disk 7, a thrust bearing 93 is provided between the bottom of the eccentric correction tooling 10 and the rotating disk 7, and the thrust bearing 93 is fixed to the rotating disk 7 through a bearing seat 94.

[0021] As Figure 5 shown, since the eccentric hole of the eccentric housing 11 is not at the rotation center of the rotation assembly 9, in order to enable the eccentric housing 11 to rotate smoothly during the polishing process, the eccentric housing 11 is installed in the eccentric correction tooling 10; as Figure 8 shown, the eccentric correction tooling 10 includes an eccentric fixing shell 101, and a stepped mounting hole 102 is provided on the eccentric fixing shell 101; the eccentric housing 11 is fixedly installed in the stepped mounting hole 102 of the eccentric fixing shell 101 through screws, and the central axis of the eccentric hole of the eccentric housing 11 coincides with the central axis of the eccentric fixing shell 101; a plurality of center of gravity adjustment holes 103 are provided at the top of the eccentric fixing shell 101.

[0022] An industrial computer is installed in the frame 1 at the bottom of the workbench 2, and a polishing system, a surface finish measurement system and a PLC controller connected to the industrial computer; among them, the PLC controller is connected to the XYZ three-axis linear module 3, the Z-axis lifting linear module 5, and the stepping motor 91; the polishing head 4 is connected to the polishing system, and the surface finish measuring instrument 6 is connected to the surface finish measurement system.

[0023] As Figure 2 and Figure 3 shown, in order to make the process of rotating and switching workstations more accurate, and in order to further ensure that the polishing head 4 and the surface finish measuring instrument 6 can accurately extend into the eccentric hole of the eccentric housing 11, a plurality of circumferentially evenly distributed mounting grooves are provided on the workbench 2, and an electric cylinder 12 is installed in the mounting groove; the output shaft of the electric cylinder 12 points to the center of the rotating disk 7, and a positioning member adapted to the output shaft of the electric cylinder 12 is provided on the rotating disk 7. The positioning member includes two screw rods 13, the two screw rods 13 are respectively fixed on both sides of the output shaft of the electric cylinder 12, and a rotating sleeve 14 is rotatably installed at the top of the screw rod 13, and the outer side wall of the rotating sleeve 14 is attached to the output shaft of the electric cylinder 12; positioning is achieved by inserting the output shaft of the electric cylinder 12 between the two rotating sleeves 14 of the positioning member.

[0024] In order to cool down the polishing and grinding head 4 during the polishing and grinding process, a coolant tank is provided inside the frame 1. A circulation pump is provided inside the coolant tank and is connected to the PLC controller, and the start or stop of the circulation pump is controlled by the PLC controller; the liquid outlet of the circulation pump is connected to the coolant interface of the polishing and grinding head 4 through a liquid delivery pipeline; in order to recycle the coolant, a ring-shaped coolant diversion groove 15 is provided on the workbench 2, and the coolant diversion groove 15 is communicated with the coolant tank through a coolant collection pipeline.

[0025] The grinding method based on the above-mentioned eccentric housing polishing and grinding equipment provided by the present invention is specifically as follows: 1) Load the eccentric housing 11 into the eccentric correction tooling 10 at the loading and unloading station; 2) Set the polishing and grinding parameters, surface finish measurement parameters and surface finish standard data through the industrial computer, and send them to the polishing and grinding system and the surface finish measurement system respectively; Among them, the polishing and grinding parameters include the working frequency of the polishing and grinding head 4, the distance between the polishing and grinding head 4 and the inner wall of the eccentric hole, and the feed rate of the polishing and grinding head 4; the surface finish parameters include the measurement speed and the pressure of the surface finish measuring instrument 6; they can be set as required during actual application; 3) Control the three-way indexer 8 to rotate through the PLC controller, and rotate the eccentric housing 11 from the loading and unloading station to the polishing and grinding station; 4) Control the stepping motor 91 to drive the eccentric correction tooling 10 to rotate itself through the PLC controller; Start the polishing and grinding head 4, control the circulation pump to work through the PLC controller, discharge the coolant in the coolant tank through the liquid delivery pipeline from the coolant outlet of the polishing and grinding head 4, and cool the polishing and grinding head 4; At the same time, the PLC controller controls the Z-axis linear module in the XYZ three-axis linear module 3 to move downward along the Z-axis, so that the polishing and grinding head 4 polishes the inner wall of the eccentric hole; After the polishing and grinding is completed, the stepping motor 91, the circulation pump and the polishing and grinding head 4 stop working, and the polishing and grinding head 4 withdraws from the eccentric hole; 5) Control the three-way indexer 8 to rotate through the PLC controller, and rotate the eccentric housing 11 from the polishing and grinding station to the surface finish measurement station; 6) Start the surface finish measuring instrument 6. At the same time, control the Z-axis lifting linear module 5 to move downward along the Z-axis through the PLC controller, so that the surface finish measuring instrument 6 extends into the eccentric hole, and the surface finish measuring instrument 6 detects the surface finish of the inner wall of the eccentric hole and collects the surface finish data of the eccentric hole; After the collection is completed, the surface finish measuring instrument 6 withdraws from the eccentric hole and sends the surface finish data to the surface finish measurement system; 7) The surface finish measurement system compares the surface finish data with the surface finish standard data; If the surface finish data is not within the threshold range, where the threshold range is the error range set in combination with the standard data of the inner wall surface finish of the eccentric hole; control the three-way divider 8 to rotate in the reverse direction through the PLC controller, rotate the eccentric housing 11 from the surface finish measurement station to the polishing and grinding station, and re-execute step 4). If the surface finish data is within the threshold range, the surface finish measuring instrument 6 stops working and exits the eccentric hole, and step 8) is executed. 8) Control the three-way divider 8 to rotate through the PLC controller, rotate the eccentric housing 11 from the surface finish measurement station to the loading and unloading station. After taking out the polished and ground eccentric housing 11, the polishing and grinding of the eccentric housing 11 is completed.

[0026] As described above, it is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any change or replacement within the technical scope disclosed by the present invention should be covered within the protection scope of the present invention. Therefore, the protection scope of the present invention should be subject to the protection scope of the claimed rights.

Claims

1. An eccentric shell polishing and grinding device, characterized in that: It comprises a frame (1), and a workbench (2) located inside the frame (1), wherein the workbench (2) is divided into three equal parts: a loading and unloading station, a polishing and grinding station, and a finish measurement station; An XYZ three-axis linear module (3) is provided on the frame (1) located above the polishing and grinding station, and a polishing and grinding head (4) is provided on the slide of the Z-axis linear module in the XYZ three-axis linear module (3); a Z-axis lifting linear module (5) is provided on the frame (1) located above the finish measurement station, and a finish measuring instrument (6) is provided on the slide of the Z-axis lifting linear module (5); A rotating disk (7) is provided in the middle of the workbench (2), a three-part indexer (8) is provided at the bottom of the rotating disk (7), and the three-part indexer (8) is fixed to the top of the frame (1); The top of the rotating disk (7) is provided with three self-rotating components (9) evenly distributed around the circumference, the top of the self-rotating component (9) is provided with an eccentric correction tool (10), and the eccentric shell (11) is installed in the eccentric correction tool (10); the polishing head (4) and the surface finish measuring instrument (6) can both be inserted into the eccentric hole of the eccentric shell (11); The frame (1) is equipped with an industrial computer located at the bottom of the workbench (2), as well as a polishing and grinding system, a finish measurement system and a PLC controller connected to the industrial computer; wherein the PLC controller is connected to an XYZ three-axis linear module (3), a Z-axis lifting linear module (5), and a rotation component (9); the polishing and grinding head (4) is connected to the polishing and grinding system, and the finish measurement instrument (6) is connected to the finish measurement system.

2. The eccentric housing polishing and grinding device according to claim 1, characterized in that: The self-rotating assembly (9) comprises a stepping motor (91) located at the bottom of the rotating disk (7), and the stepping motor (91) is connected to a PLC controller; The output shaft of the stepper motor (91) passes through the rotating disk (7) and is provided with a coupling (92), and the top of the coupling (92) is connected to the eccentricity correction tool (10); A thrust bearing (93) is provided between the bottom of the eccentric correction tool (10) and the rotating disk (7), and the thrust bearing (93) is fixed on the rotating disk (7) via a bearing seat (94).

3. The eccentric housing polishing and grinding device according to claim 1, characterized in that: The eccentric correction tool (10) comprises an eccentric fixing shell (101), and the eccentric fixing shell (101) is provided with a stepped mounting hole (102); The eccentric housing (11) is fixedly mounted in the stepped mounting hole (102) of the eccentric fixed housing (101) by means of screws, and the central axis of the eccentric hole of the eccentric housing (11) coincides with the central axis of the eccentric fixed housing (101); A plurality of center of gravity adjustment holes (103) are provided on the top of the eccentric fixed shell (101).

4. The eccentric housing polishing and grinding equipment according to claim 1, characterized in that: The workbench (2) is provided with a plurality of installation grooves evenly distributed around the circumference, and the electric cylinders (12) are installed in the installation grooves; The output shaft of the electric cylinder (12) points to the center of the rotating disk (7), and a positioning piece matched with the output shaft of the electric cylinder (12) is provided on the rotating disk (7).

5. The eccentric housing polishing and grinding device according to claim 4, characterized in that: The positioning member comprises two screw rods (13), the two screw rods (13) are respectively fixed on both sides of the output shaft of the electric cylinder (12), and a rotating sleeve (14) is rotatably installed on the top of the screw rod (13), and the outer side wall of the rotating sleeve (14) is in contact with the output shaft of the electric cylinder (12).

6. The eccentric housing polishing and grinding device according to claim 1, characterized in that: The frame (1) is provided with a coolant tank, and a circulating pump is provided in the coolant tank, and the liquid outlet of the circulating pump is connected to the coolant interface of the polishing and grinding head (4) through a liquid delivery pipeline; The workbench (2) is provided with an annular coolant guide groove (15), and the coolant guide groove (15) is connected to the coolant tank through a coolant collecting pipe.

7. A method for polishing an eccentric housing, characterized in that: The steps include: S1. Install the eccentric housing (11) into the eccentric correction tool (10) of the loading and unloading station; S2. Set polishing parameters and finish measurement parameters through the industrial computer, and send them to the polishing system and finish measurement system respectively; S3, controlling the rotation of the three-part indexer (8) through the PLC controller to rotate the eccentric housing (11) from the loading and unloading station to the polishing and grinding station; S4, the PLC controller controls the rotation component (9) to drive the eccentricity correction tooling (10) to rotate; The polishing and grinding head (4) is started, and at the same time, the PLC controller controls the Z-axis linear module in the XYZ three-axis linear module (3) to move downward along the Z-axis, so that the polishing and grinding head (4) polishes the inner wall of the eccentric hole; After polishing and grinding are completed, the self-rotating assembly (9) and the polishing and grinding head (4) stop working, and the polishing and grinding head (4) withdraws from the eccentric hole; S5, controlling the rotation of the three-part indexer (8) through the PLC controller to rotate the eccentric housing (11) from the polishing and grinding station to the finish measurement station; S6, start the surface finish measuring instrument (6), and at the same time, control the Z-axis lifting linear module (5) to move downward along the Z-axis by the PLC controller, so that the surface finish measuring instrument (6) extends into the eccentric hole, and the surface finish measuring instrument (6) detects the surface finish of the inner wall of the eccentric hole, and collects the surface finish data of the eccentric hole; After the acquisition is completed, the surface finish measuring instrument (6) withdraws from the eccentric hole and sends the surface finish data to the surface finish measuring system; S7, the finish measurement system compares the finish data with the finish standard data; If the finish data is not within the threshold range, the PLC controller controls the three-part indexer (8) to rotate in the opposite direction, rotates the eccentric housing (11) from the finish measurement station to the polishing station, and re-executes step S4; If the finish data is within the threshold range, the finish measuring instrument (6) stops working and exits the eccentric hole, and executes step S8; S8, controlling the rotation of the three-part divider (8) through the PLC controller, rotating the eccentric housing (11) from the finish measurement station to the loading and unloading station, taking out the eccentric housing (11) after polishing and grinding, and completing the polishing and grinding of the eccentric housing (11).

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