Accurate grinding device for stainless steel powder metallurgy component

Abstract

The utility model relates to the field of powder metallurgy part machining, and discloses a stainless steel powder metallurgy part accurate grinding device. The device comprises an abrasive belt grinding mechanism, a sliding abutting assembly, a lifting mechanism and a part positioning plate, and the lifting mechanism is connected with the abrasive belt grinding mechanism to drive the abrasive belt grinding mechanism to ascend and descend relative to the part positioning plate; a workpiece is suitable for being positioned and placed on the part positioning plate, the abrasive belt grinding mechanism comprises an annular abrasive belt, the multiple sliding abutting assemblies are arranged on the peripheral side of the outer portion of the annular abrasive belt at intervals, during grinding, the workpiece is located in the annular abrasive belt, and the multiple sliding abutting assemblies move in the direction close to the workpiece so that the annular abrasive belt can be attached to the plane and the cambered surface of the workpiece; and after polishing is finished, the lifting mechanism drives the abrasive belt polishing mechanism to ascend, and the workpiece is taken down. According to the utility model, a workpiece with a plurality of planes and cambered surfaces on the outer surface can be simultaneously and wholly polished, so that the efficiency of fine polishing of the workpiece is improved; the grinding effect is improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to powder metallurgy part processing technical field, specifically, a kind of stainless steel powder metallurgy part fine grinding device. BACKGROUND

[0002] Part of stainless steel special-shaped parts, due to its complex structure, the efficiency of turning processing when mass production will be relatively low, so it will usually adopt powder metallurgy technology production. The present application discloses a special-shaped annular part processed by powder metallurgy technology, which is a circular ring, but the outer peripheral wall of the annular part is provided with a plurality of planes and circular surfaces at intervals, the inner hole of the annular part is elliptical, and in addition, the end of the annular part is also symmetrically provided with two groups of through holes, each group of through holes includes a plurality of small holes arranged at intervals in the circumferential direction.

[0003] However, when polishing the outer peripheral surface of the above-mentioned special-shaped part, the worker needs to fix the workpiece on the tooling, and then use the polishing device to polish the plurality of planes and circular surfaces of the outer peripheral wall of the special-shaped part one by one, which is low in polishing efficiency. SUMMARY

[0004] To solve at least one of the above problems, the utility model provides a kind of stainless steel powder metallurgy part fine grinding device, including abrasive belt polishing mechanism, sliding abutment component, lifting mechanism and part positioning plate, the lifting mechanism is connected with the abrasive belt polishing mechanism to drive the abrasive belt polishing mechanism to lift relative to the part positioning plate;Workpiece is suitable for positioning and placing on the part positioning plate, the abrasive belt polishing mechanism includes annular abrasive belt, the sliding abutment component is provided with a plurality of outside the annular abrasive belt and is spaced, when polishing, workpiece is located in the annular abrasive belt, a plurality of sliding abutment components move to the direction close to workpiece to drive the annular abrasive belt and the plane and the arc surface on workpiece are attached;After polishing, the lifting mechanism drives the abrasive belt polishing mechanism to rise so as to remove workpiece on the part positioning plate.

[0005] Optionally, the abrasive belt polishing mechanism further includes a mounting shell and a sand belt motor, the sand belt motor is installed in the mounting shell, the sand belt motor is suitable for driving the annular abrasive belt to rotate, and the mounting shell is connected with the lifting mechanism.

[0006] Optionally, a first gear belt ring is inserted inside the annular abrasive belt, the first gear belt ring is connected with the annular abrasive belt and rotates synchronously, a plurality of main synchronous pulleys are rotatably arranged at the bottom of the mounting shell, a plurality of the main synchronous pulleys are arranged at intervals inside the first gear belt ring and are all engaged with the main synchronous pulleys, a driving pulley is arranged on the motor shaft of the sand belt motor, the driving pulley is located between a plurality of the main synchronous pulleys, and a plurality of the main synchronous pulleys are all engaged with the driving pulley.

[0007] Optionally, the abrasive belt polishing mechanism further comprises a four-jaw chuck at the bottom of the annular abrasive belt, and a secondary synchronous pulley is rotatably arranged on the four-jaw chuck, and during polishing, the secondary synchronous pulley is adapted to be located inside the annular abrasive belt and rotate synchronously.

[0008] Optionally, the annular abrasive belt is internally and fixedly provided with a second gear ring near one end of the four-jaw chuck, the four-jaw chuck comprises a base body and four clamping jaws, the four clamping jaws are uniformly and circumferentially arranged on the base body, and the four clamping jaws slide along the radial direction of the base body, and the secondary synchronous pulley is provided with four, and the four secondary synchronous pulleys are rotatably arranged on the four clamping jaws respectively, and during polishing, the four secondary synchronous pulleys are all in meshing connection with the second gear ring.

[0009] Optionally, a deformed wire ring is sleeved on the second gear ring.

[0010] Optionally, a support plate is arranged on the outer side of the base body, and a driving motor is arranged on the support plate, and the driving motor is adapted to drive the clamping jaws to move the secondary synchronous pulley.

[0011] Optionally, the sliding abutting assembly is arranged on the support plate, and the sliding abutting assembly comprises a sliding block, a fixed plate and a driving spring, the sliding block is located on the side of the fixed plate close to the workpiece and is in sliding connection with the support plate, the fixed plate is fixed on the support plate, and the driving spring is located between the sliding block and the fixed plate, and the sliding block is adapted to drive the annular abrasive belt to be attached to the plane or arc surface of the workpiece.

[0012] Optionally, a wire hook is connected to the sliding block, and one end of the wire hook close to the fixed plate is adapted to be hooked with the fixed plate to limit the movement of the sliding block to the workpiece.

[0013] Compared with the prior art, the beneficial technical effects of the utility model lie in that:

[0014] 1. When the workpiece needs to be polished, the lifting mechanism drives the abrasive belt polishing mechanism to descend and makes the annular abrasive belt be sleeved on the workpiece, and then the sliding abutting piece makes the annular abrasive belt at the arc surface and the plane of the workpiece abut against the workpiece, so that the annular abrasive belt can polish the entire outer surface of the workpiece when rotating, and the efficiency of polishing the workpiece is improved.

[0015] 2. The arrangement of the four-jaw chuck, the second gear ring and the secondary synchronous pulley can make the end of the annular abrasive belt away from the abrasive belt motor be opened and driven, ensure the tightness of the upper and lower ends of the annular abrasive belt, improve the polishing effect, and also make the annular abrasive belt rotate more smoothly after being driven.

[0016] 3. The deformation wire ring allows the annular sanding belt to remain open when it is raised and lowered and does not mesh with the secondary synchronous pulley. This ensures that the workpiece is accurately and completely inside the annular sanding belt during raising and lowering, making it less likely to collide with the workpiece. At the same time, it will not affect the smoothness of the secondary synchronous pulley and the second gear belt ring when they mesh and rotate.

[0017] 4. After grinding, when it is necessary to remove the workpiece, the operator can pull the wire hook to drive the sliding block to move towards the fixed plate to loosen the ring sander belt, and hook the wire hook on the fixed plate to lock the sliding block. The operation is convenient and low cost. Attached Figure Description

[0018] Figure 1 This is a structural diagram of the belt sanding mechanism, the sliding contact component, and the lifting mechanism in the embodiments of this utility model;

[0019] Figure 2 This is an exploded view of the belt sanding mechanism, the sliding contact assembly, and the part positioning plate in the embodiments of this utility model;

[0020] Figure 3 This is an exploded view of the belt sanding mechanism in an embodiment of this utility model;

[0021] Figure 4 This is an exploded view of the annular sanding belt and the four-jaw chuck in an embodiment of this utility model;

[0022] Figure 5 This is an exploded view of the sliding contact component in an embodiment of this utility model;

[0023] Figure 6 This is a structural diagram of the irregularly shaped ring-shaped part in an embodiment of this utility model.

[0024] Explanation of reference numerals in the attached drawings: 1. Belt sanding mechanism; 11. Annular sanding belt; 12. Mounting housing; 13. Belt sanding motor; 14. First gear belt ring; 15. Drive wheel; 16. Main synchronous pulley; 17. Four-jaw chuck; 171. Support plate; 172. Drive motor; 18. Secondary synchronous pulley; 19. Second gear belt ring; 191. Deformable wire ring; 2. Sliding abutment assembly; 21. Sliding block; 22. Fixing plate; 23. Drive spring; 24. Wire hook; 3. Lifting mechanism; 31. Z-shaped plate; 32. Drive cylinder; 4. Part positioning plate; 41. Extension column. Detailed Implementation

[0025] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the following description is provided in conjunction with the appendix. Figures 1-6 This application will be described in further detail.

[0026] Reference Figure 6, the workpiece is a special-shaped annular part which needs to be finely polished, the special-shaped annular part is a circular ring, a plurality of planes are symmetrically arranged on the outer peripheral wall of the special-shaped annular part, the inner hole of the special-shaped annular part is an oval, and two grooves are symmetrically arranged on the outer wall of the special-shaped annular part.

[0027] The utility model discloses an embodiment provides a kind of stainless steel powder metallurgy piece fine grinding device, refer to Figure 1 With Figure 2 , the stainless steel powder metallurgy piece fine grinding device includes sand belt polishing mechanism 1 installed on platform, sliding abutment component 2, lifting mechanism 3 and part positioning plate 4.Lifting mechanism 3 is connected with sand belt polishing mechanism 1 to drive sand belt polishing mechanism 1 to lift relative to part positioning plate 4;Workpiece is suitable for positioning and placing on part positioning plate 4, and when polishing, lifting mechanism 3 drives sand belt polishing mechanism 1 to descend and is set to workpiece.Sliding abutment component 2 is arranged at intervals on the circumferential side of workpiece, and multiple sliding abutment components 2 are slidably arranged on platform and move to the direction close to workpiece to enable sand belt polishing mechanism 1 to be attached to multiple planes and camber on workpiece, to realize the polishing of the whole outer circumferential surface of workpiece.After polishing, lifting mechanism 3 drives sand belt polishing mechanism 1 to ascend to facilitate workpiece to be removed on part positioning plate 4.

[0028] Part positioning plate 4 top is integrally formed with oval block that is suitable for the size of the oval inner hole of workpiece;Meanwhile, part positioning plate 4 top is also integrally formed with multiple positioning columns.When polishing workpiece, oval block is inserted into the inner hole of workpiece, and multiple positioning columns are inserted into corresponding small holes, so that workpiece is positioned and placed on part positioning plate 4.Workpiece is placed on part positioning plate 4, and the outer peripheral wall of workpiece protrudes from part positioning plate 4, so as to facilitate contact with sand belt polishing mechanism 1 to realize fine polishing.

[0029] Combined Figure 1 Refer to Figure 2 With Figure 3 , sand belt polishing mechanism 1 includes annular sand belt 11, mounting shell 12 and sand belt motor 13.Sand belt motor 13 is installed in mounting shell 12, and the motor shaft of sand belt motor 13 protrudes from the bottom of mounting shell 12 through mounting shell 12 to drive annular sand belt 11 to rotate.The inner side of annular sand belt 11 is the polishing side, so that annular sand belt 11 can polish the outer circumferential surface of workpiece after being set on workpiece.Mounting shell 12 is connected with lifting mechanism 3, so that lifting mechanism 3 can drive the whole sand belt polishing mechanism 1 to lift.

[0030] The first gear belt ring 14 is inserted into the inner part of the annular abrasive belt 11 near one end of the mounting shell 12, and the outer peripheral wall of the first gear belt ring 14 abuts against the inner peripheral wall of the annular abrasive belt 11 and is connected by strong glue. The inner peripheral wall of the first gear belt ring 14 is circumferentially spaced apart to be provided with a plurality of protruding teeth. The motor shaft of the abrasive belt motor 13 is provided with a driving wheel 15, the driving wheel 15 is located at the bottom of the mounting shell 12, and the driving wheel 15 is a gear. A plurality of cylinders are welded at the bottom of the mounting shell 12, and the plurality of cylinders are uniformly and circumferentially arranged outside the driving wheel 15. A main synchronous pulley 16 is rotatably installed on each cylinder, and a circlip is arranged on the cylinder, and the main synchronous pulley 16 is installed on the cylinder by the circlip and is not easy to fall off from the cylinder. The main synchronous pulley 16 is also a gear, and the plurality of main synchronous pulleys 16 are located inside the first gear belt ring 14; and the plurality of main synchronous pulleys 16 are engaged with the first gear belt ring 14 and the driving wheel 15, so that the annular abrasive belt 11 can be driven to rotate after the driving wheel 15 is driven to rotate by the abrasive belt motor 13.

[0031] In order to keep the stable cooperation between the first gear belt ring 14 and the plurality of main synchronous pulleys 16, each main synchronous pulley 16 is integrally formed with a protruding edge away from one end of the mounting shell 12, and the bottom of the first gear belt ring 14 abuts against the protruding edge to be limited and not easy to fall off in the vertical direction.

[0032] In combination Figure 1 With reference to Figure 2 With Figure 3 In combination With reference to

[0033] With Figure 2 With reference to Figure 3 With Figure 4The second gear belt ring 19 is inserted into the inner part of the annular abrasive belt 11 near one end of the four-jaw chuck 17 and is glued by strong glue. The outer peripheral wall of the second gear belt ring 19 abuts against the inner peripheral wall of the annular abrasive belt 11, and the inner peripheral wall of the second gear belt ring 19 is also circumferentially spaced with a plurality of protruding teeth. The four sub-synchronous pulleys 18 are all gears, and all engage with the second gear belt ring 19 during polishing. In order to prevent the workpiece from interfering with the annular abrasive belt 11 during the lifting and lowering of the annular abrasive belt 11, the inner diameters of the annular abrasive belt 11 and the sub-synchronous pulleys 18 are all greater than the outer diameter of the workpiece. In addition, in order to make the annular abrasive belt 11 smoothly pass through the workpiece in the lifted and lowered state without engaging with the sub-synchronous pulleys 18, a deformed wire loop 191 is sleeved on the second gear belt ring 19.

[0034] The four clamping jaws are provided with an extension column 41, the extension column 41 is fixed on the platform, and the part positioning plate 4 is fixed on the top of the extension column 41 by bolts. The outer diameter of the extension column 41 is smaller than the outer diameter of the part positioning plate 4, so that the four clamping jaws have a large moving space when moving close to the center of the base to loosen the abutment of the annular abrasive belt 11.

[0035] In addition, since there are four clamping jaws in the embodiment, four groups of electric components are arranged on the platform, and the four groups of electric components are arranged on the circumferential side of the base and correspond to the four clamping jaws one by one. Hereinafter, one group of electric components will be described as an example.

[0036] In combination Figure 2 With reference to Figure 3 With Figure 4 The electric component includes a support plate 171 and a driving motor 172, the support plate 171 is installed on the platform by bolts, and the driving motor 172 is installed on the support plate 171. A driving column is arranged on the motor shaft of the driving motor 172, the driving column is connected with the clamping jaw, the driving motor 172 can drive the driving column to rotate after rotating, thereby driving the clamping jaw to move close to or away from the center of the base. The clamping jaw moves to drive the sub-synchronous pulley 18 to move, thereby tightening or loosening the bottom of the annular abrasive belt 11.

[0037] In combination Figure 2 With reference to Figure 4 With Figure 5 The embodiment preferably comprises four groups of sliding abutting components 2, and the four groups of sliding abutting components 2 are arranged on the top of the four support plates 171. The sliding abutting component 2 comprises a sliding block 21, a fixed plate 22 and a driving spring 23. Among them, only the shape of the sliding block 21 near the workpiece side of the four groups of sliding abutting components 2 is different, specifically, the sliding block 21 at the arc surface is provided with an arc groove, and the sliding block 21 at the plane is provided with a groove matched with the plane. Hereinafter, the specific structure of the sliding abutting component 2 at the plane of the workpiece will be described as an example.

[0038] The sliding block 21 is located on the side of the fixed plate 22 close to the workpiece and is in sliding connection with the support plate 171, the fixed plate 22 is fixed on the support plate 171, the driving spring 23 is located between the sliding block 21 and the fixed plate 22, and the sliding block 21 drives the annular abrasive belt 11 to tightly adhere to the plane of the workpiece under the driving of the driving spring 23. The end of the sliding block 21 close to the driving spring 23 is provided with a spring groove, the end of the fixed plate 22 close to the driving spring 23 is fixed with a spring column, one end of the spring is sleeved on the spring column and the other end is inserted into the spring groove, so that the driving spring 23 is not easy to fall off during the movement of the sliding block 21. The bottom of the sliding block 21 is fixedly provided with a dovetail block, the top of the support plate 171 is provided with a dovetail groove for inserting and sliding the dovetail block, so that the sliding block 21 can move stably and directionally.

[0039] In combination Figure 2 With reference to Figure 4 With Figure 5 , the top of the sliding block 21 is connected with a wire hook 24, after polishing, when the workpiece needs to be removed, the end of the wire hook 24 close to the fixed plate 22 is suitable for hooking connection with the fixed plate 22, so as to limit the movement of the sliding block 21 to the direction of the workpiece, facilitating the taking and placing of the workpiece.

[0040] With reference to Figure 1 With Figure 2 , the lifting mechanism 3 includes a Z-shaped plate 31 and a driving cylinder 32, the Z-shaped plate 31 is fixedly installed on the platform through bolts, and the driving cylinder 32 is installed on the Z-shaped plate 31. The telescopic rod of the driving cylinder 32 is fixedly connected with the mounting shell 12, so as to drive the whole abrasive belt polishing mechanism 1 to lift.

[0041] The implementation principle of the stainless steel powder metallurgy part fine grinding device is that when the workpiece needs to be polished, the workpiece is positioned on the part positioning plate 4. The driving cylinder 32 drives the abrasive belt polishing mechanism 1 to descend and makes the annular abrasive belt 11 sleeved on the workpiece, then the wire hook 24 limiting the fixed block is removed, the four fixed blocks make the annular abrasive belt 11 at the arc surface and the plane of the workpiece abut tightly, so that the annular abrasive belt 11 can fine polish the whole outer surface of the workpiece when rotating. The setting of the four-jaw chuck 17, the second gear belt ring 19 and the auxiliary synchronous pulley 18 can make the end of the annular abrasive belt 11 away from the abrasive belt motor 13 be opened and driven, so as to ensure the tightness of the upper and lower ends of the annular abrasive belt 11 and improve the polishing effect.

[0042] Equivalently, the components included in the "assembly", "mechanism", "device" of the present disclosure can also be flexibly combined, that is, they can be modularly produced and modularly assembled as an independent module, or they can be assembled separately and constitute a module in the device. The division of the above components in the present disclosure is only one embodiment, for the convenience of reading, and is not a limitation on the scope of protection of the present disclosure, as long as the above components are included and the same function is understood as an equivalent technical solution of the present disclosure.

[0043] In the description of the present disclosure, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present disclosure.

[0044] In addition, the terms "first", "second", and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" and the like can explicitly or implicitly include at least one of the features. In the description of the present disclosure, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly specified and limited.

[0045] In the present disclosure, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present disclosure can be understood according to the specific circumstances.

[0046] In the present disclosure, unless specifically defined and limited otherwise, a first feature "on" or "under" a second feature can be directly in contact with the second feature, or indirectly in contact with the second feature through an intermediate medium. Moreover, the first feature "over", "above" and "on top of" the second feature can be directly above or obliquely above the second feature, or simply indicate that the first feature is higher in level than the second feature. The first feature "under", "below" and "underneath" the second feature can be directly below or obliquely below the second feature, or simply indicate that the first feature is lower in level than the second feature.

[0047] It should be noted that when an element is referred to as being "fixed", "disposed", "secured" or "arranged" to another element, it can be directly on the other element or there can be an intermediate element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there can be an intermediate element. Further, when an element is referred to as being "fixedly connected" to another element, the two elements can be fixedly connected in a detachable manner or fixedly connected in a non-detachable manner such as by sleeving, clamping, integrally forming, welding, etc., which can be achieved in the prior art and will not be described here.

[0048] The technical features of the above embodiments can be combined in any manner. To make the description concise, not all possible combinations of the technical features in the above embodiments are described, but as long as the combinations of the technical features do not contradict each other, they should be considered within the scope of the present disclosure.

[0049] The above embodiments only express several implementation manners of the present disclosure, and the description is specific and detailed, but it should not be understood as a limitation on the scope of the utility model patent. It should be noted that for those skilled in the art, without departing from the utility model concept of the present disclosure, some modifications and improvements can be made, which are within the protection scope of the present disclosure.

Claims

1. A finishing device for stainless steel powder metallurgical pieces, characterized in that it comprises: Including abrasive belt polishing mechanism (1), sliding abutment assembly (2), lifting mechanism (3) and part positioning plate (4), the lifting mechanism (3) is connected with the abrasive belt polishing mechanism (1) to drive the abrasive belt polishing mechanism (1) to lift relative to the part positioning plate (4);Workpiece is suitable for positioning and placing on the part positioning plate (4), the abrasive belt polishing mechanism (1) includes annular abrasive belt (11), the sliding abutment assembly (2) is spaced apart at the outside of the annular abrasive belt (11), when polishing, workpiece is located in the annular abrasive belt (11), multiple sliding abutment assemblies (2) move to the direction close to workpiece to drive the annular abrasive belt (11) and the plane and arc surface on workpiece are fitted;After polishing, the lifting mechanism (3) drives the abrasive belt polishing mechanism (1) to rise so as to take off workpiece on the part positioning plate (4).

2. The stainless steel powder metallurgy part finishing apparatus according to claim 1, characterized by: The abrasive belt polishing mechanism (1) further comprises a mounting shell (12) and a sand belt motor (13), the sand belt motor (13) is installed in the mounting shell (12), the sand belt motor (13) is suitable for driving the annular abrasive belt (11) to rotate, the mounting shell (12) is connected with the lifting mechanism (3).

3. The stainless steel powder metallurgy part finishing apparatus of claim 2, wherein: The inside of the annular abrasive belt (11) is provided with a first gear belt ring (14), the first gear belt ring (14) is connected with the annular abrasive belt (11) and rotates synchronously, the bottom of the mounting shell (12) is rotatably provided with a plurality of main synchronous pulleys (16), a plurality of the main synchronous pulleys (16) are arranged in the first gear belt ring (14) and are engaged with the main synchronous pulleys (16), the motor shaft of the sand belt motor (13) is provided with a driving wheel (15), the driving wheel (15) is located between a plurality of the main synchronous pulleys (16) and is engaged with the main synchronous pulleys (16).

4. The stainless steel powder metallurgy part finishing apparatus of claim 1 wherein: The abrasive belt polishing mechanism (1) further comprises a four-jaw chuck (17) located at the bottom of the annular abrasive belt (11), a secondary synchronous pulley (18) is rotatably provided on the four-jaw chuck (17), during polishing, the secondary synchronous pulley (18) is suitable to be located inside the annular abrasive belt (11) and rotates synchronously.

5. The stainless steel powder metallurgy part finishing apparatus of claim 4, wherein: The inside of the annular abrasive belt (11) close to one end of the four-jaw chuck (17) is provided with a second gear belt ring (19) and is fixedly installed, the four-jaw chuck (17) comprises a base body and four clamping jaws, the four clamping jaws are uniformly and evenly arranged on the base body in the circumferential direction, and the four clamping jaws slide along the radial direction of the base body, the secondary synchronous pulley (18) is provided with four, the four secondary synchronous pulleys (18) are rotatably installed on the four clamping jaws respectively, during polishing, the four secondary synchronous pulleys (18) are engaged with the second gear belt ring (19).

6. The stainless steel powder metallurgy part finishing apparatus of claim 5, wherein: The second gear belt ring (19) is provided with a deformation wire ring (191).

7. The stainless steel powder metallurgy part finishing apparatus of claim 5 wherein: The outside of the base body is provided with a support plate (171), a driving motor (172) is installed on the support plate (171), the driving motor (172) is suitable for driving the clamping jaw to move the secondary synchronous pulley (18).

8. The stainless steel powder metallurgy part finishing apparatus of claim 7, wherein: The sliding abutting component (2) is arranged on the support plate (171), and comprises a sliding block (21), a fixed plate (22) and a driving spring (23), the sliding block (21) is located on the side of the fixed plate (22) close to the workpiece and is in sliding connection with the support plate (171), the fixed plate (22) is fixed on the support plate (171), and the driving spring (23) is located between the sliding block (21) and the fixed plate (22), and the sliding block (21) is suitable for driving the annular abrasive belt (11) to be attached to the plane or arc surface of the workpiece.

9. The stainless steel powder metallurgy part finishing apparatus of claim 8, wherein: A wire hook (24) is connected to the sliding block (21), one end of the wire hook (24) close to the fixed plate (22) is suitable for hooking connection with the fixed plate (22), so as to limit the movement of the sliding block (21) to the workpiece direction.

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