A magnesium-aluminum alloy motor shell polishing device and polishing method

Abstract

This invention discloses a polishing device and method for magnesium-aluminum alloy motor housings, relating to the field of machining technology. The device includes a clamping and rotating mechanism, a motion execution component, and a polishing mechanism. The polishing mechanism includes a fixed polishing component and two flipping polishing components, which are respectively disposed on both sides of the fixed polishing component and can be adjusted in horizontal opening angle relative to the fixed polishing component. This invention, through a three-brush head layout with adjustable angles (one fixed and two moving), can adapt to the outer circumferential curvature of the motor housing, achieving comprehensive coverage of the gaps and roots of the heat sink fins. Simultaneously, it employs a transmission wheel with radial expansion characteristics as the power transmission medium. Adjacent transmission wheels press against each other, and when the center distance changes due to the adjustment of the flipping polishing component angle, the radial deformation of the expansion ring maintains stable friction, ensuring the continuity and stability of power transmission. This effectively solves the technical problems of incomplete polishing coverage and easy transmission interruption in complex heat sink fin structures.

Description

Technical Field

[0001] This invention relates to the field of machining technology, specifically to a polishing device and method for magnesium-aluminum alloy motor housings. Background Technology

[0002] Magnesium-aluminum alloys are widely used in the manufacture of high-performance motor housings due to their low density, high specific strength, excellent heat dissipation, and good shielding properties. During the production of motor housings, polishing is typically required to improve surface finish, enhance corrosion resistance, and improve the product's appearance. Current polishing processes often employ handheld abrasives or semi-automatic polishing equipment, using polishing wheels, abrasive belts, or other abrasive materials to rub the rotating surface of the motor housing, removing casting burrs, oxide layers, and reducing surface roughness.

[0003] However, with increasing demands for motor cooling, motor housings are typically designed as annular structures with multiple raised heat dissipation fins to maximize heat exchange area. Each raised heat dissipation fin extends axially along the motor housing, posing a significant challenge to the polishing process. Due to the narrow gaps between the fins, their numerous numbers, and their arrayed distribution, traditional polishing tools struggle to reach the fin roots and the spaces between them, resulting in incomplete polishing coverage and numerous processing dead zones. Existing methods often rely on manual touch-up polishing, which is not only extremely labor-intensive and difficult to guarantee consistent polishing quality, but also has a long processing cycle and low production efficiency, failing to meet the demands of automated mass production. Summary of the Invention

[0004] The purpose of this invention is to provide a polishing device and polishing method for magnesium-aluminum alloy motor housings, which solves the technical problems mentioned in the background art.

[0005] The present invention solves the above-mentioned technical problems through the following technical solutions, the present invention comprising:

[0006] shell;

[0007] The clamping and rotating mechanism, located inside the housing, is used to support and drive the motor housing to rotate circumferentially.

[0008] Motion actuators located inside the housing;

[0009] A polishing mechanism is installed at the end of the motion actuator, the motion actuator being able to drive the polishing mechanism to move axially and radially along the motor housing;

[0010] The polishing mechanism includes a fixed polishing component and two flip polishing components. The two flip polishing components are respectively disposed on both sides of the fixed polishing component and can be adjusted at a horizontal opening angle relative to the fixed polishing component, so that the fixed polishing component and the two flip polishing components can work on the outer wall of the motor housing at the same time.

[0011] Preferably, the polishing mechanism further includes a fixed block and two flipping blocks; the fixed block is fixed to the execution end of the motion execution component, and the two flipping blocks are respectively connected to the two sides of the fixed block by a rotating shaft; the fixed polishing component is disposed on the fixed block, and the two flipping polishing components are respectively disposed on the two flipping blocks.

[0012] Preferably, it further includes an angle adjustment mechanism for driving the two flipping blocks to rotate synchronously. The angle adjustment mechanism includes a first motor and two first gears; the two first gears are respectively fixed on the rotating shafts of the two flipping blocks, and the two first gears mesh with each other; the first motor is connected to one of the rotating shafts.

[0013] Preferably, both of the flip-polishing parts are adjustablely mounted on the corresponding flip blocks via a lateral moving assembly; the lateral moving assembly includes a groove formed on the flip block and a slider slidably disposed in the groove, an external threaded cylinder is fixed on one side of the slider, the flip-polishing part is rotatably mounted on the slider and the external threaded cylinder, a first nut is threadedly connected to the external threaded cylinder, and the first nut abuts and locks against the side surface of the flip block.

[0014] Preferably, both the fixed polishing component and the flip polishing component include a transverse rod rotatably mounted on the fixed block or the flip block, and a polishing brush is mounted on one end of the transverse rod near the clamping and rotating mechanism.

[0015] Preferably, the polishing brush includes a brush head and a round rod disposed at the end of the brush head, the round rod being threadedly connected to one end of the transverse rod and locked in place by a second nut.

[0016] Preferably, the fixed polishing part and the two flip polishing parts are all driven to rotate by a power assembly; the power assembly includes three transmission wheels fixed to the fixed polishing part and the two flip polishing parts respectively, and a driving component. The transmission wheels have radial expansion characteristics, and two adjacent transmission wheels are in mutual squeezing contact. The driving component is connected to the fixed polishing part in a transmission connection.

[0017] Preferably, the transmission wheel includes a circular block and an expansion ring covering the outer circumferential surface of the circular block. The expansion ring is an expandable elastic element with a sealed internal chamber. The ends of the fixed polishing component and the two flipping polishing components are provided with air supply holes that communicate with the sealed chambers of the corresponding expansion rings.

[0018] The expansion degree of the expansion ring is adjustable, and it is used to maintain a mutually pressing contact state through the radial deformation of the expansion ring when the center distance between two adjacent transmission wheels changes.

[0019] Preferably, the driving component includes a second motor installed at the end of the motion execution component, a second gear fixed at the output end of the second motor, and a third gear meshing with the second gear fixed on the fixed polishing component.

[0020] The present invention also proposes a polishing method based on the aforementioned magnesium-aluminum alloy motor housing polishing device, comprising the following steps:

[0021] Step 1: Clamp the motor housing using the clamping and rotating mechanism;

[0022] Step 2: By adjusting the horizontal opening angle of the two flip polishing parts relative to the fixed polishing part, the distribution of the brush heads of the fixed polishing part and the two flip polishing parts is adapted to the gap between the heat dissipation fins of the motor housing.

[0023] Step 3: Drive the polishing mechanism to move by the motion execution component, so that the brush heads of the fixed polishing part and the two flipping polishing parts move to the axial extension line of the gap between the corresponding heat dissipation fins of the motor housing;

[0024] Step 4: Start the drive unit to drive the fixed polishing part and the two flip polishing parts to rotate. Then, through the motion execution component, the heat dissipation fins of the rotating motor housing are polished.

[0025] Step 5: During the polishing process, the angle of the motor housing is adjusted by the clamping and rotating mechanism to polish all the heat dissipation fins on the motor housing.

[0026] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0027] 1. This application achieves efficient adaptation to complex heat dissipation fin structures by using a "one fixed, two moving" polishing component, combined with an angle adjustment mechanism and a horizontal rod length fine-tuning function. The brush head adopts a contour-following design, with the side inclination matching the fin gap, and the end has a forward-protruding structure, ensuring that the brush bristles can penetrate deep into the fin root and the bottom turning surface of the motor housing. This effectively eliminates the processing dead angles present in traditional flat-head brushes, significantly improves the surface finish and texture consistency of the magnesium-aluminum alloy motor housing, and solves the industry pain points of difficult polishing and low coverage of irregularly shaped parts.

[0028] 2. This application ingeniously uses a transmission wheel with radial expansion characteristics as the power transmission medium. The expansion degree of the expansion ring is adjusted in real time through a pneumatic system, so that when the polished part is flipped to adjust the processing angle and the center distance changes, the adjacent transmission wheels can still maintain a stable friction force through compression, which ensures the continuity and stability of power transmission and avoids transmission interruption or slippage caused by angle switching.

[0029] 3. This application integrates multiple dimensions, including angle adjustment, axial displacement, radial lateral movement, and brush head length adjustment. The angle adjustment mechanism adapts to the workpiece curvature, the lateral movement component adjusts the spacing within the slide groove, and the axial feed of the motion actuator completes the workspace coverage. This high degree of freedom allows the same equipment to adapt to the production needs of motor housings with various diameters and fin depths. This high versatility significantly reduces the cost for companies to develop dedicated fixtures for different products, improving the flexibility and responsiveness of the production line. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the planar structure of the present invention;

[0031] Figure 2 This is a three-dimensional structural diagram of the clamping and rotating mechanism, the motion execution component, and the polishing mechanism in this invention;

[0032] Figure 3 for Figure 2 First-view structural diagram of the polishing mechanism;

[0033] Figure 4 for Figure 2 A second-view structural diagram of the polishing mechanism;

[0034] Figure 5 for Figure 3 A top-view cross-sectional view of a single flipped polished part.

[0035] Figure 6 This is a top view of the structure when the present invention is in use.

[0036] The numbers in the image represent:

[0037] 1-Clamping and rotating mechanism; 11-Allowing block; 2-Motion execution component; 31-Second motor; 32-Third gear; 33-Second gear; 341-Expansion ring; 342-Circular block; 35-Rotary joint; 4-Polishing mechanism; 41-Fixing block; 42-Flipping block; 43-Horizontal rod; 44-Polishing brush; 441-Brush head; 45-Second nut; 5-Angle adjustment mechanism; 51-First motor; 52-First gear; 6-Horizontal movement assembly; 61-Slide groove; 62-Slider; 63-External threaded cylinder; 64-First nut; 100-Outer shell. Detailed Implementation

[0038] The above-mentioned and other technical features and advantages of the present invention will be described in more detail below with reference to the accompanying drawings.

[0039] This embodiment provides a technical solution: a polishing device for magnesium-aluminum alloy motor housings, such as... Figures 1 to 6 As shown, the device includes a housing 100 and a clamping and rotating mechanism 1, a polishing mechanism 4, and a motion execution component 2 that drives the polishing mechanism 4 to move, all of which are disposed inside the housing 100. Through the functional coordination of each component, it is possible to achieve efficient and all-round automatic polishing of the motor housing with a complex heat dissipation fin structure.

[0040] The housing 100 has a closed working chamber, in which the clamping and rotating mechanism 1, the motion execution component 2, and the polishing mechanism 4 are all housed. A door is provided on the front of the housing 100 to close the chamber during operation, improving operational safety and preventing dust leakage during polishing. A control panel is located on one side of the housing 100, electrically connected to the drive system of each mechanism, for controlling the operating status of each mechanism.

[0041] Furthermore, the control panel is pre-installed with a programmable logic controller (PLC), which can edit and store corresponding control programs for different models of motor housings to achieve automated adaptation processing of workpieces of different specifications.

[0042] Specifically, the main function of the clamping and rotating mechanism 1 is to support and drive the motor housing to rotate circumferentially. It is installed at the center of the bottom of the working chamber. The clamping and rotating mechanism 1 includes at least a clamp for centering and clamping the motor housing. In practical applications, this clamp is preferably a manual three-jaw chuck or a hydraulic automatic chuck. To achieve controlled angular rotation, the clamp is connected to a rotary drive system. The rotary drive system can be directly driven by a servo motor, or it can be a combination drive of a motor and a sprocket / synchronous belt. All of the above can utilize existing technologies and products, which will not be elaborated upon here.

[0043] Furthermore, to address the issue of potential mechanical collisions between the polishing mechanism 4 (especially the brush head 441) and the clamping components during deep polishing of the motor housing ends or sides, a stop block 11 is provided on the outer side of the clamping jaws. For example... Figure 2 As shown, the end face of the motor housing abuts against the abutment block 11, thereby reserving sufficient clearance space between the motor housing and the fixture body.

[0044] The motion actuator 2, serving as the core of the entire device, is installed inside the working chamber. It can be adaptively selected as an industrial robotic arm or a two-axis / multi-axis gantry robot, depending on the automation requirements of the production site. Regardless of the form, the end effector of the motion actuator 2 is connected to the polishing mechanism 4 and can drive the polishing mechanism 4 to make smooth displacements along the axial and radial directions of the motor housing. This multi-degree-of-freedom adjustment capability ensures that the device can perform comprehensive polishing of the outer surface of the motor housing without any blind spots, greatly improving processing efficiency and the consistency of surface finish.

[0045] The polishing mechanism 4 is specifically installed at the end of the motion actuator 2, serving as the core component for directly performing the polishing process. It includes a fixed polishing element installed at the center of the end of the motion actuator 2, and two flipping polishing elements symmetrically arranged on either side of the fixed polishing element. The two flipping polishing elements can adjust their horizontal opening angle relative to the central fixed polishing element, thereby forming a processing surface that adapts to the circumferential curvature of the motor housing. The angle adjustment of the two flipping polishing elements is precisely driven and locked by the angle adjustment mechanism 5.

[0046] A fixing block 41 is fixed at the end of the motion execution component 2, serving as the support base for the entire polishing head assembly. Rotating shafts are symmetrically arranged on both sides of the fixing block 41, and two rotating blocks 42 are horizontally connected via these shafts. The fixed polishing component is positioned on the central axis of the fixing block 41, while the two rotating polishing components are correspondingly positioned on the two rotating blocks 42.

[0047] Both the fixed polishing component and the flip polishing component include a transverse rod 43. The transverse rod 43 is rotatably mounted on the corresponding fixed block 41 or flip block 42 via a transmission component such as a bearing, to provide support for subsequent polishing rotation. A polishing brush 44 is mounted on one end of the transverse rod 43 (the end facing the motor housing).

[0048] The polishing brush 44 has an external thread at the round end and an internal thread hole at the corresponding end of the transverse rod 43. The external thread and the internal thread hole form a matching threaded connection. By manually or with a tool rotating the polishing brush 44, the depth of the external thread extending into the internal thread hole can be adjusted, thus achieving fine adjustment of the overall overhang length of the polishing brush 44.

[0049] In addition, to ensure connection stability under high-speed rotation and vibration environments, a second nut 45 is additionally threaded onto the external thread. The second nut 45 is located at the junction of the polishing brush 44 and the transverse rod 43, and abuts against the end face of the transverse rod 43. After adjusting the length of the polishing brush 44, the second nut 45 is tightened in the reverse direction to generate a preload force against the end of the transverse rod 43, thereby axially fixing the polishing brush 44; conversely, the polishing brush 44 can be quickly disassembled and replaced by loosening the second nut 45.

[0050] Additionally, it should be noted that the axial cross-sectional profile (or outer circumferential profile) of the brush head 441 is not a simple cylinder, but rather is designed to match the lateral tilt angle of the heat dissipation fins on the outer circumferential surface of the motor housing. For example... Figure 5 and Figure 6 As shown, when the polishing mechanism 4 is in the working position, the side surface of the brush head 441 can form a large area of ​​linear contact or surface contact with the side slope of the heat dissipation fins.

[0051] Furthermore, to provide the necessary cutting power to the brush head 441, both the rotating polishing parts and the fixed polishing parts are driven to rotate by a power assembly. The core of the power assembly is a friction transmission system capable of adapting to changes in angle, which includes transmission wheels respectively fixed on three transverse rods 43.

[0052] The transmission wheel has a significant radial expansion characteristic, and in the assembled state, two adjacent transmission wheels maintain mutual compression contact, using the friction generated by the contact surface to achieve the step-by-step transmission of power.

[0053] The transmission wheel includes a circular block 342 fixedly sleeved on the outer periphery of the transverse rod 43, and an expansion ring 341 covering the outer circumferential surface of the circular block 342. The expansion ring 341 is made of expandable rubber material with excellent elasticity and wear resistance, and its outer surface is provided with rough texture (such as knurling or frosting) to further enhance the coefficient of friction and prevent transmission slippage.

[0054] To achieve precise control over the degree of expansion, an air inlet is axially formed inside the transverse rod 43. The inner end of this air inlet communicates with a sealed chamber inside the expansion ring 341. The outer end of the air inlet is connected to an external air pipe via a rotary joint 35, ultimately leading to the pneumatic control system. By injecting or expelling compressed air into the expansion ring 341 through this system, the radial outer diameter of the expansion ring 341 can be adjusted in real time.

[0055] A drive unit is provided at the execution end of the motion execution component 2 to simultaneously drive the fixed polishing component and the two flipping polishing components to rotate. The drive unit includes a second motor 31. A third gear 32 is fixed at the end of the transverse rod 43 to which the fixed polishing component belongs, and a second gear 33 that meshes with it is fixed at the output end of the second motor 31.

[0056] When the second motor 31 is started, the power is transmitted to the third gear 32 via the second gear 33, driving the fixed polishing part in the middle to rotate. Then, through the friction and squeezing cooperation between the three transmission wheels (i.e. the expansion ring 341 in the center and the expansion rings 341 on both sides), the rotational power is synchronously distributed to the flipping polishing parts on both sides, thereby driving the three brush heads 441 to rotate simultaneously and perform efficient polishing on the motor housing.

[0057] It should be further noted that during actual operation, because the expansion ring 341 is made of high-performance elastic material, it possesses excellent deformation recovery performance and initial geometric support. Throughout the polishing cycle, the expansion ring 341 remains in a controlled expansion state. Even when the air pressure provided by the air supply system is at the minimum within the set range, the expansion ring 341 can still maintain a full circular shape due to the structural strength of its material, without shrinking or collapsing. Furthermore, considering that polishing operations are usually accompanied by high-frequency vibration and a certain amount of frictional heat, if the expansion ring 341 experiences stress relaxation, loss of original elasticity, or wear due to prolonged repeated use or extreme conditions, this device employs a modular replacement scheme. Operators can easily replace the entire transmission wheel (including the circular block 342 and the expansion ring 341) or only the expansion ring 341 through a simple disassembly and assembly process.

[0058] The angle adjustment mechanism 5 includes a first motor 51 fixed to the bottom of the execution end of the motion execution component 2 by a bracket. The output end of the first motor 51 is connected to one of the rotating shafts. Both rotating shafts are fixed with first gears 52. The two first gears 52 are meshed together. When the first motor 51 is running, the two rotating blocks 42 can be driven to rotate towards one side or the opposite side of the fixed block 41 at the same angle and speed through the cooperation of the two first gears 52, thereby driving the two rotating polishing parts to adjust the angle.

[0059] Furthermore, to enhance the equipment's adaptability to motor housings of different diameters or external shapes, both flip-polishing parts are adjustablely mounted on their respective flipping blocks 42 via the transverse shift assembly 6. The transverse shift assembly 6 allows for positional compensation of the flip-polishing parts in either the outward or inward dimensions.

[0060] The transverse component 6 includes a groove 61 formed on the flip block 42, a slider 62 is slidably disposed inside the groove 61, the slider 62 can linearly move back and forth along the trajectory of the groove 61, and an external threaded cylinder 63 is fixedly connected to one side of the slider 62.

[0061] The transverse rod 43 is installed inside the slider 62 and the external threaded cylinder 63 through rotating support components such as bearings, so that the transverse rod 43 can move laterally synchronously with the slider 62 while having rotational power.

[0062] Furthermore, a first nut 64 is threaded onto the outer circumference of the external threaded cylinder 63. The design parameters of the first nut 64 are unique: its outer diameter is set to be significantly larger than the vertical slot size of the slide groove 61. Based on this structure, the inner end face of the first nut 64 can form a large-area abutment support with the side surface of the flipping block 42.

[0063] In actual operation, when it is necessary to adjust the lateral position of the rotating polishing part, the operator only needs to loosen the first nut 64 to release its pressure on the side of the rotating block 42, and then manually slide the slider 62 in the groove 61 to the target position, thereby adjusting the distance of the rotating polishing part relative to the center of rotation. After adjusting to the ideal position, tightening the first nut 64 utilizes the strong axial tension generated by the threaded pair to tightly lock the first nut 64 against the side of the rotating block 42, thereby firmly fixing the entire polishing unit in the current position and preventing it from shifting randomly due to vibration or centrifugal force during high-speed polishing operations.

[0064] When in use, this device can polish the motor housing with three brush heads 441 to improve efficiency. In addition, the three brush heads 441 can also be used for coarse polishing, medium polishing and fine polishing respectively.

[0065] The above are merely preferred embodiments of the present invention and are illustrative in nature, not restrictive. Those skilled in the art will understand that many changes, modifications, and even equivalents can be made within the spirit and scope defined by the claims of the present invention, all of which will fall within the protection scope of the present invention.

Claims

1. A polishing device for magnesium-aluminum alloy motor housings, characterized in that, include: Outer shell (100); The clamping and rotating mechanism (1) located inside the housing (100) is used to support and drive the motor housing to rotate circumferentially; Motion execution component (2) disposed inside the housing (100); The polishing mechanism (4) is installed at the end of the motion actuator (2), and the motion actuator (2) is capable of driving the polishing mechanism (4) to move axially and radially along the motor housing; The polishing mechanism (4) includes a fixed polishing component and two flip polishing components. The two flip polishing components are respectively disposed on both sides of the fixed polishing component and can be adjusted at a horizontal opening angle relative to the fixed polishing component so that the fixed polishing component and the two flip polishing components can work on the outer wall of the motor housing at the same time.

2. The polishing device for magnesium-aluminum alloy motor housing according to claim 1, characterized in that, The polishing mechanism (4) further includes a fixed block (41) and two flipping blocks (42); the fixed block (41) is fixed to the execution end of the motion execution component (2), and the two flipping blocks (42) are respectively connected to the two sides of the fixed block (41) by a rotating shaft; the fixed polishing component is disposed on the fixed block (41), and the two flipping polishing components are respectively disposed on the two flipping blocks (42).

3. The polishing device for magnesium-aluminum alloy motor housing according to claim 2, characterized in that, It also includes an angle adjustment mechanism (5) for driving the two flip blocks (42) to rotate synchronously. The angle adjustment mechanism (5) includes a first motor (51) and two first gears (52). The two first gears (52) are respectively fixed on the rotating shafts of the two flip blocks (42) and the two first gears (52) mesh with each other. The first motor (51) is connected to one of the rotating shafts.

4. The polishing device for magnesium-aluminum alloy motor housing according to claim 2, characterized in that, Both of the aforementioned flip-polishing parts are adjustablely mounted on the corresponding flip blocks (42) via a transverse assembly (6); the transverse assembly (6) includes a groove (61) opened on the flip block (42) and a slider (62) slidably disposed in the groove (61). An external threaded cylinder (63) is fixed on one side of the slider (62). The flip-polishing part is rotatably mounted on the slider (62) and the external threaded cylinder (63). A first nut (64) is threadedly connected to the external threaded cylinder (63). The first nut (64) abuts and locks against the side surface of the flip block (42).

5. The polishing device for magnesium-aluminum alloy motor housing according to claim 2, characterized in that, Both the fixed polishing component and the flip polishing component include a transverse rod (43) rotatably mounted on the fixed block (41) or the flip block (42), and a polishing brush (44) is mounted on one end of the transverse rod (43) near the clamping and rotating mechanism (1).

6. The polishing device for magnesium-aluminum alloy motor housing according to claim 5, characterized in that, The polishing brush (44) includes a brush head (441) and a round rod disposed at the end of the brush head (441). The round rod is threaded to one end of the transverse rod (43) and locked in place by a second nut (45).

7. The polishing device for magnesium-aluminum alloy motor housing according to claim 2, characterized in that, The fixed polishing part and the two flip polishing parts are all driven to rotate by a power assembly; the power assembly includes three transmission wheels fixed to the fixed polishing part and the two flip polishing parts respectively, and a driving component. The transmission wheels have radial expansion characteristics, and two adjacent transmission wheels are in mutual squeezing contact. The driving component is connected to the fixed polishing part in a transmission connection.

8. The polishing device for magnesium-aluminum alloy motor housing according to claim 7, characterized in that, The transmission wheel includes a circular block (342) and an expansion ring (341) covering the outer circumferential surface of the circular block (342). The expansion ring (341) is an expandable elastic element with a sealed chamber inside. The ends of the fixed polishing part and the two flip polishing parts are provided with air supply holes that communicate with the sealed chambers of the corresponding expansion rings (341). The expansion degree of the expansion ring (341) is adjustable, and it is used to maintain a mutually pressing contact state through the radial deformation of the expansion ring (341) when the center distance between two adjacent transmission wheels changes.

9. The polishing device for magnesium-aluminum alloy motor housing according to claim 7, characterized in that, The driving component includes a second motor (31) installed at the end of the motion execution component (2), a second gear (33) is fixed at the output end of the second motor (31), and a third gear (32) is fixed on the fixed polishing component and meshes with the second gear (33).

10. A polishing method based on the magnesium-aluminum alloy motor housing polishing apparatus according to any one of claims 1-9, characterized in that, Includes the following steps: Step 1: Clamp the motor housing using the clamping and rotating mechanism (1); Step 2: By adjusting the horizontal opening angle of the two flip polishing parts relative to the fixed polishing part, the distribution of the brush heads (441) of the fixed polishing part and the two flip polishing parts is adapted to the gap between the heat dissipation fins of the motor housing. Step 3: Drive the polishing mechanism (4) to move by the motion execution component (2), so that the brush head (441) of the fixed polishing part and the two flip polishing parts moves to the axial extension line of the gap between the corresponding heat dissipation fins of the motor housing; Step 4: Start the drive unit to drive the fixed polishing part and the two flip polishing parts to rotate. Then, through the motion execution part (2), the heat dissipation fins of the rotating motor housing are polished. Step 5: During the polishing process, the angle of the motor housing is adjusted by the clamping and rotating mechanism (1) to polish the heat dissipation fins on all parts of the motor housing.

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