Finish machining method after sintering forming of powder metallurgy bearing for miniature fan

Abstract

The invention relates to the technical field of powder metallurgy processing, in particular to a fine machining method for a powder metallurgy bearing for a miniature fan after sintering molding, which comprises the following specific steps: S1, manufacturing, compression molding and sintering a miniature fan bearing; s2, finishing is conducted, specifically, the bearing obtained after powder metallurgy sintering is subjected to finishing and then pressurized; s3, cutting machining, wherein an oil storage groove in the inner side of the bearing is bored and machined; s4, grinding, namely grinding the inner cylindrical surface, the outer cylindrical surface and the end surface of the bearing; s5, polishing: polishing the contact surface of the inner ring of the bearing; s6, oil immersion: carrying out oil immersion on the bearing by using a vacuum oil immersion device; s7, discharging and stacking, waiting for subsequent assembly, and assembling the miniature fan; finish machining is carried out on the bearing obtained after powder metallurgy sintering, it is ensured that the structure size and the surface of the bearing meet the use requirement of a miniature fan, meanwhile, vacuum oil immersion treatment is carried out, oil is continuously leaked in cooperation with a powder metallurgy pore structure, and the bearing lubricating effect is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of powder metallurgy processing, and in particular to a fine processing method for a powder metallurgy bearing for a micro fan after sintering and molding. Background Art

[0002] Micro fans are widely used in traditional or modern instruments and equipment such as computers, communication products, optoelectronic products, and automotive electronic equipment. They play an important role in guiding air and dissipating heat. The bearings used in micro fans can be made using powder metallurgy technology, which can improve lubrication and reduce production costs. However, micro fans are micro products, and the precision requirements of their parts are very strict during the processing and assembly process. After the powder metallurgy parts are sintered, they still need to be fine-processed.

[0003] Metal powder metallurgy is a process technology that uses molding and sintering processes to make metal powder into materials and products. It is a very commonly used process technology in the field of modern metal processing and is mostly used to produce alloy products.

[0004] However, most of the products produced by this process technology have a rough surface and are accompanied by some burrs or scraps. They cannot be used directly and usually require precision processing. Moreover, if complex structures such as oil storage tanks need to be processed, the powder metallurgy pressing process cannot be completed. A high-precision production line is required to process the parts after sintering. Special equipment is expensive and has limited functions, which small enterprises cannot afford. Directly purchasing finished products is costly. If manual polishing is used, the production efficiency is low and the processing precision cannot be guaranteed. Summary of the invention

[0005] The purpose of the present invention is to solve the shortcomings of the prior art and to propose a method for fine machining of a powder metallurgy bearing for a micro fan after sintering.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions: A method for fine machining a powder metallurgy bearing for a micro fan after sintering and forming, the specific steps comprising: S1. Manufacturing of micro fan bearings, powder preparation, mixing, pressing and sintering; S2, finishing, using presses, molds and other special equipment to finish and pressurize the bearings after powder metallurgy sintering; S3, cutting and boring to form the oil storage groove inside the bearing; S4, grinding, grinding the inner cylindrical surface, outer cylindrical surface and end surface of the bearing; S5, polishing, polishing the contact surface of the inner ring of the bearing; S6, oil immersion, use a vacuum oil immersion device to immerse the bearing in oil; S7, the discharged materials are stacked and wait for subsequent assembly to assemble the micro fan.

[0007] Preferably, in steps S3, S4 and S5, the equipment used for the cutting, grinding and polishing processing includes a tool table, a workpiece rack and a workpiece disk; the tool table includes a turntable and a tool assembly, the tool assembly includes a boring tool, a turning tool, a milling cutter, a grinding head and a polishing head, the turntable can be rotatably locked to switch the tool assembly to adapt to different production and processing requirements; the workpiece rack adjusts and fixes the bearing workpiece, and controls the rotation of the bearing to meet the processing requirements, the workpiece disk stores oil to facilitate lubrication during the bearing processing process, and at the same time recovers the processed bearings to facilitate subsequent centralized processing.

[0008] Preferably, a longitudinal slide is provided on the lower side of the turntable, the turntable is slidably connected to the longitudinal slide, and a locking device is provided on the turntable; a transverse slide is provided on the lower side of the longitudinal slide, the longitudinal slide drives the turntable to slide longitudinally, and a base is provided on the lower side of the transverse slide, and the transverse slide drives the longitudinal slide and the turntable to slide transversely.

[0009] Preferably, the workpiece rack includes a chassis, a flip seat and a workpiece clamp, and the flip seat is provided with at least one group and is slidably connected to the chassis; the flip seat is used to adjust the angle of the workpiece clamp, and a driving component is provided on the flip seat, and the driving component is used to control the opening and closing and rotation of the workpiece clamp.

[0010] Preferably, the driving assembly includes a rotating motor and a telescopic motor, the workpiece clamp is arranged on one side of the adjusting seat, and the adjusting seat is provided with a locking sleeve adapted to the workpiece clamp; the telescopic motor controls the axial movement of the workpiece clamp, one end of the workpiece clamp is an elastic clamp, and the locking sleeve is used to cooperate with the elastic clamp to clamp the bearing workpiece, a transmission device is provided on the outside of the locking sleeve, and the rotating motor drives the locking sleeve to rotate through the transmission device.

[0011] Preferably, the workpiece pan comprises a carrier pan and an oil pan, an arc-shaped groove is provided at the bottom of the carrier pan, an oil drain screen is provided on one side of the arc-shaped groove, an oil change valve is provided on one side of the oil pan, and the carrier pan is embedded on the upper side of the oil pan.

[0012] Preferably, a loading device is provided on the side of the workpiece disk facing away from the tool station, and a vibration disk is provided on one side of the loading device; the loading device includes a loading disk and an adjustment bracket, and the loading disk includes a positioning roller, a recovery tray and a conveyor belt.

[0013] Preferably, there are multiple groups of positioning rollers, and the array is arranged on the upper side of the recovery tray, the conveyor belt is arranged between the gaps of the multiple groups of positioning rollers, and a driving device is provided at one end of the conveyor belt; the recovery tray is slidably connected to the adjustment bracket, and a lifting rod is provided on the lower side of the adjustment bracket.

[0014] Preferably, the processing technology in steps S3, S4 and S5 specifically includes: A. The vibrating plate automatically loads the material, and the sintered bearing falls on the positioning roller. During the rotation of the conveyor belt, the bearing is driven to move, and the bearing is gradually straightened and arranged along the gap between the positioning rollers. At the same time, it is pushed to one side driven by the conveyor belt; B. The flip seat slides on the chassis to adjust the height. At the same time, the flip seat rotates to adjust the angle of the workpiece fixture until the workpiece fixture is aligned with the bearing. The recovery tray is moved to bring the bearing close to the workpiece fixture. The telescopic motor controls the workpiece fixture to clamp and complete the clamping. C. The flip seat drives the workpiece fixture to swing, causing the bearing to contact the lubricating oil in the arc groove of the carrier plate. The rotating motor drives the bearing to rotate through the workpiece fixture to throw out excess lubricating oil. Then the flip seat rotates to control the workpiece fixture to align with the tool table. D. Adjust the tool table, switch the boring tool, bore out the oil storage groove on the inner side of the bearing, and at the same time, finish the inner assembly surface of the bearing. Repeat step C again, immerse in oil, clean the bearing, switch the turning tool, grinding head or polishing head, and finish the side curved surface and end face of one end of the bearing; E. Adjust the bearing clamping direction and repeat step D to finish the other end of the bearing. To ensure machining reliability, the workpiece fixture clamping depth should be 1 / 3 to 1 / 2 of the bearing length. F. The turning seat rotates, the workpiece fixture swings down, the bearing is released, and the bearing falls into the carrier plate.

[0015] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention performs fine machining, boring, grinding and polishing on the bearing after powder metallurgy sintering to ensure that the bearing structure size and surface meet the use requirements of the micro fan and ensure the product qualification rate. At the same time, vacuum oil immersion treatment is performed to cooperate with the pore structure of powder metallurgy. In subsequent use, oil seepage is continuously carried out to ensure the lubrication effect of the bearing; 2. The present invention is provided with a feeding device to improve the feeding efficiency. At the same time, a processing method in which the workpiece rotates and the tool is fixed is adopted, which makes it easier to ensure the processing accuracy and reduce the equipment cost. At the same time, a tool table is provided to switch the tools and perform various processing, thereby improving the practicality and universality and reducing the floor space occupied by the equipment. It is suitable for low-cost production enterprises to replace manual grinding and ensure production efficiency and production quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic diagram of the working process of a method for fine machining of a powder metallurgy bearing for a micro fan after sintering and forming proposed by the present invention; Figure 2 A schematic diagram of the three-dimensional assembly structure of a device used in a method for fine machining a powder metallurgy bearing for a micro fan after sintering and forming according to the present invention; Figure 3 A schematic diagram of the three-dimensional structure of a tool table, a workpiece rack and a workpiece plate used in a method for finishing a powder metallurgy bearing for a micro fan after sintering and forming according to the present invention; Figure 4 A schematic diagram of the three-dimensional structure of the first solution of a workpiece holder used in a method for fine machining of a powder metallurgy bearing for a micro fan after sintering and forming according to the present invention; Figure 5 A schematic diagram of the three-dimensional structure of the second solution of a workpiece holder used in a method for fine machining of a powder metallurgy bearing for a micro fan after sintering and forming according to the present invention; Figure 6 A schematic diagram of the main cross-sectional structure of a feeding device used in a method for fine machining of a powder metallurgy bearing for a micro fan after sintering and forming according to the present invention; Figure 7 for Figure 3 A schematic diagram of the local enlarged structure at point A in the middle; Figure 8 A schematic diagram of the three-dimensional cross-sectional structure of a micro-fan according to the present invention and a method for fine machining a powder metallurgy bearing for a micro-fan after sintering.

[0017] In the figure: 1. tool table; 11. turntable; 12. locking device; 13. tool assembly; 14. longitudinal slide; 15. transverse slide; 16. base; 2. workpiece rack; 21. chassis; 22. flip seat; 23. workpiece fixture; 231. locking sleeve; 24. rotating motor; 241. transmission device; 25. telescopic motor; 26. adjustment seat; 3. vibration plate; 4. loading device; 41. loading plate; 411. positioning roller; 412. recovery tray; 413. conveyor belt; 42. adjustment bracket; 43. driving device; 5. workpiece plate; 51. carrier plate; 511. oil drain screen; 52. oil pan; 521. oil change valve; 6. bearing; 7. micro fan. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] Reference Figure 1-8 A method for fine processing of a powder metallurgy bearing for a micro fan after sintering and forming, the specific steps include: S1, manufacturing of micro fan bearing 6, powder preparation, mixing, pressing and sintering; Through mechanical and physical and chemical methods, bulk metals, alloys or metal compounds are converted from solid, liquid or gaseous states into powder state, and the materials are mixed according to the formula to ensure that the components are evenly distributed; the evenly mixed loose powder is processed into a green block with a certain shape, size, density and strength, and the formed green block is sintered to obtain the required physical and mechanical properties.

[0020] S2, finishing, using a press, a mold and other special equipment to finish and pressurize the bearing 6 after powder metallurgy sintering. The mold material is usually cemented carbide. The cemented carbide mold can withstand a large processing force and is not easy to deform, thereby ensuring the quality and consistency of the finished product; before finishing, the product is immersed in lubricating oil to improve the product finishing quality and the service life of the mold; the lubricating oil can form a protective film on the surface of the product, reduce the friction between the product and the mold during the finishing process, thereby reducing the wear of the mold and extending its service life; at the same time, the presence of lubricating oil helps to reduce scratches and wear on the surface of the product, and improve the surface quality and dimensional accuracy of the product; The amount of finishing needs to be determined according to the size of the product and the finishing method, and must be strictly controlled; too much finishing may cause the product size to exceed the tolerance range, while too little finishing may not achieve the expected quality effect; in order to improve the dimensional accuracy and uniform pore distribution of the product, it is often used to re-press along the height direction and then finish; or full finishing is used, and finishing is performed simultaneously along the inner and outer diameters and the height direction in the finishing mold; S3, cutting and boring to form an oil storage groove on the inner side of the bearing 6; Use a boring tool to process the inner side of the bearing 6 to form an oil storage tank. After the bearing 6 is assembled, the oil storage tank stores lubricating oil during use to ensure the lubrication effect between the bearing 6 and the shaft; The tool material for processing copper-based oil-containing bearings is generally made of tungsten drill-type hard alloy. After the blade is ground with a diamond grinding wheel, it needs to be carefully ground with an oil stone. The tool is fixed and the workpiece is rotated. When the processed hole is located on the rotation center, the position accuracy of the hole can be more easily guaranteed. At the same time, it is convenient to process deep holes, reduce the deflection of the drill bit or tool rod due to the length flexibility, and maintain the straightness of the hole. S4, grinding, grinding the inner cylindrical surface, outer cylindrical surface and end surface of the bearing 6 to ensure the assembly surface accuracy, and micro-cutting the surface of the sintered bearing 6 by abrasive particles to improve the surface quality and dimensional accuracy; S5, polishing, polishing the inner ring contact surface of the bearing 6 corresponding to the shaft to reduce the surface roughness, obtain a bright and flat surface, remove the defects on the surface, and ensure qualified assembly accuracy; S6, oil immersion; use a vacuum oil immersion device to immerse the bearing 6 in oil. Under the vacuum state, the air in the pores of the bearing 6 is exhausted as much as possible. Due to the pressure difference, the oil is sucked into the pores of the bearing 6, which is conducive to the continuous exudation of lubricating oil from the working surface of the bearing 6 under the working state, so as to achieve self-lubricating properties; Keep it in vacuum state for 10 to 15 minutes, the vacuum degree shall not be greater than 1 mm mercury column, the heating temperature is 80 to 120 ° C, the oil temperature should not be too high to prevent oil oxidation; the commonly used impregnation lubricating oil is No. 20 or No. 30 engine oil. When the speed, load and operating temperature of the bearing 6 are different, the viscosity, viscosity index and freezing point of the oil shall be reasonably selected; S7, the material is discharged and stacked, and the processed bearing 6 falls into the workpiece tray. The construction personnel replace the workpiece tray in time, store the bearing 6, and carry out subsequent transportation or wait for subsequent assembly to assemble the micro fan 7.

[0021] like Figures 2 to 7 As shown in: In steps S3, S4 and S5, finishing after sintering can ensure its dimensional accuracy and good working surface condition; The processing device used includes: a tool table 1, a workpiece rack 2 and a workpiece disk 5, wherein the tool table 1 and the workpiece rack 2 are respectively arranged on two adjacent sides of the workpiece disk 5, the tool table 1 includes a turntable 11 and a tool assembly 13, a longitudinal slide 14 is arranged at the lower side of the turntable 11, a transverse slide 15 is arranged at the lower side of the longitudinal slide 14, and a base 16 is arranged at the lower side of the transverse slide 15 to realize the horizontal adjustment of the tool assembly 13; The tool assembly 13 includes a boring tool, a turning tool, a milling cutter, a grinding head and a polishing head. The turntable 11 is rotatably connected to the longitudinal slide 14. The turntable 11 can be rotated and locked to switch the tool assembly 13 or adjust the tool angle. It is locked by the locking device 12 to adapt to different production and processing requirements. The workpiece rack 2 is used to adjust and fix the bearing 6 workpiece. At the same time, during processing, the bearing 6 is controlled to rotate to meet the processing requirements. The workpiece rack 2 includes a chassis 21, a flip seat 22 and a workpiece fixture 23. The flip seat 22 is provided with at least one group, and is slidably connected to the chassis 21. The flip seat 22 is used to adjust the angle of the workpiece fixture 23. A driving component is provided on the flip seat 22. The driving component is used to control the opening and closing and rotation of the workpiece fixture 23. A rotating component is provided on the flip seat 22, and the rotating axis of the rotating component is horizontally arranged. An adjusting seat 26 is provided on the rotating component of the flip seat 22. The position of the adjusting seat 26 on the flip seat 22 is adjustable. A rotating motor 24 and a telescopic motor 25 are provided on the adjusting seat 26. The rotating motor 24 is used to control the rotation of the workpiece fixture 23. The telescopic motor 25 is used to control the opening and closing of the workpiece fixture 23, and clamp or remove the workpiece. The workpiece fixture 23 is arranged on one side of the adjustment seat 26, and a locking sleeve 231 adapted to the workpiece fixture 23 is provided on the adjustment seat 26, and the locking sleeve 231 is rotatably connected with the adjustment seat 26, and the telescopic motor 25 controls the axial movement of the workpiece fixture 23, and the output shaft of the telescopic motor 25 is connected to the workpiece fixture 23 through a connecting plate, and the workpiece fixture 23 and the connecting plate are rotatably connected, and one end of the workpiece fixture 23 is an elastic clamping claw, and the locking sleeve 231 is used to cooperate with the elastic clamping claw to clamp the bearing 6 workpiece. After locking, the workpiece fixture 23 and the locking sleeve 231 rotate as a whole, and a transmission device 241 is provided on the outer side of the locking sleeve 231. The rotating motor 24 drives the locking sleeve 231 to rotate through the transmission device 241, thereby driving the bearing 6 workpiece to rotate with the help of the elastic clamping claw; The workpiece tray 5 includes a carrier tray 51 and an oil tray 52. ​​An arc groove is provided at the bottom of the carrier tray 51. The arc groove near the tool station 1 side will fall into metal chips. The arc groove in the middle part is convenient for bearing oil immersion to ensure lubrication during processing. The arc groove near the feeding device 4 side can be used to store the processed bearing 6. The function of the arc groove can be adjusted according to production needs to distinguish finished and unqualified workpieces and improve the efficiency of parts sorting. An oil drain screen 511 is provided on one side of the arc groove for quickly draining oil. An oil change valve 521 is provided on one side of the oil tray 52 for replacing and processing lubricating oil that has been used for a period of time. The carrier tray 51 is embedded on the upper side of the oil tray 52, and the two are detachably connected; A loading device 4 is provided on the side of the workpiece disk 5 away from the tool platform 1. The loading device 4 can be manually loaded, or a vibration disk 3 can be provided on one side of the loading device 4. In order to protect the bearing, the vibration disk 3 can be made of plastic to avoid scratching the bearing surface. The loading device 4 includes a loading disk 41 and an adjustment bracket 42. The loading disk 41 includes a positioning roller 411, a recovery tray 412 and a conveyor belt 413. The positioning roller 411 is provided with multiple groups, and the array is arranged on the upper side of the recovery tray 412. The bearing 6 falls on the upper side of the positioning roller 411. The position of the bearing 6 is limited by the two positioning rollers 411. The conveyor belt 4 13 is arranged between the gaps of multiple groups of positioning rollers 411. During the rotation of the conveyor belt 413, the bearing 6 is driven to move. A driving device 43 is provided at one end of the conveyor belt 413. The conveyor belts 413 are independent of each other and are controlled by a single driving device 43 to realize bearing loading and clamping. The recovery tray 412 is slidably connected to the adjustment bracket 42. A lifting rod is provided on the lower side of the adjustment bracket 42 to facilitate the adjustment of the position of the recovery tray 412. The recovery tray 412 is tilted and an extension part is provided on the side close to the workpiece clamp 23 to ensure that the bearing that fails to be clamped can be recovered to avoid falling to the ground.

[0022] The processing technology in steps S3, S4 and S5 specifically includes: A. The vibrating plate 3 is automatically loaded, and the sintered bearing 6 falls on the positioning roller 411. During the rotation of the conveyor belt 413, the bearing 6 is driven to move, and the bearing 6 is gradually straightened and arranged along the gap between the positioning rollers 411. At the same time, it is pushed to one side under the drive of the conveyor belt 413; B. The flip seat 22 slides on the chassis 21 to adjust the height. At the same time, the flip seat 22 rotates to adjust the angle of the workpiece fixture 23 until the workpiece fixture 23 is aligned with the bearing 6. The recovery tray 412 is moved to bring the bearing 6 close to the workpiece fixture 23. The telescopic motor 25 controls the workpiece fixture 23 to clamp, and the clamping is completed. C. The turning seat 22 drives the workpiece fixture 23 to swing, causing the bearing 6 to contact the lubricating oil in the arc groove of the carrier plate 51. The rotating motor 24 drives the bearing 6 to rotate through the workpiece fixture 23 to throw out the excess lubricating oil. Then the turning seat 22 rotates to control the workpiece fixture 23 to align with the tool platform 1. D. Adjust the tool station 1, switch the boring tool, bore out the oil storage groove on the inner side of the bearing 6, and at the same time, finish the inner assembly surface of the bearing 6. Repeat step C again, immerse in oil, clean the bearing 6, switch the turning tool or grinding head, finish the side curved surface and end face of the bearing 6, switch the polishing head, perform polishing, and complete the finish processing of one end of the bearing 6; E. Adjust the clamping direction of the bearing 6, repeat step D, and perform fine machining on the other end of the bearing 6. To ensure machining reliability, the clamping depth of the workpiece fixture 23 is 1 / 3 to 1 / 2 of the bearing length. Figure 5 As shown, two sets of flip seats 22 can quickly complete the reversing clamping of the bearing 6, automatically switch the processing position, and realize the processing of the other end. At the same time, multiple sets of flip seats 22 can distribute work and complete the processing alternately, thereby improving the processing efficiency; F. The turning seat 22 rotates, the workpiece fixture 23 swings down, the bearing 6 is released, and the bearing 6 falls into the carrier plate 51.

[0023] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0024] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0025] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

Claims

1. A method for fine processing of powder metallurgy bearings for micro fans after sintering, characterized in that: The specific steps include: S1. Manufacturing of micro fan bearings, powder preparation, mixing, pressing and sintering; S2, finishing, using presses, molds and other special equipment to finish and pressurize the bearings after powder metallurgy sintering; S3, cutting and boring to form the oil storage groove inside the bearing; S4, grinding, grinding the inner cylindrical surface, outer cylindrical surface and end surface of the bearing; S5, polishing, polishing the contact surface of the inner ring of the bearing; S6, oil immersion, use a vacuum oil immersion device to immerse the bearing in oil; S7, the discharged materials are stacked and wait for subsequent assembly to assemble the micro fan.

2. The method for fine machining a powder metallurgy bearing for a micro fan after sintering according to claim 1, characterized in that: In the steps S3, S4 and S5, the equipment used for the cutting, grinding and polishing processes comprises a tool table (1), a workpiece rack (2) and a workpiece plate (5); The tool platform (1) comprises a turntable (11) and a tool assembly (13); the tool assembly (13) comprises a boring tool, a turning tool, a milling cutter, a grinding head and a polishing head; the turntable (11) can be rotatably locked to switch the tool assembly (13) to meet different production and processing requirements; The workpiece rack (2) adjusts and fixes the bearing workpiece, and controls the rotation of the bearing to meet the processing requirements. The workpiece disk (5) stores oil to facilitate lubrication during the bearing processing process, and to recover the processed bearings to facilitate subsequent centralized processing.

3. The method for fine machining a powder metallurgy bearing for a micro fan after sintering according to claim 2, characterized in that: A longitudinal slide (14) is provided at the lower side of the turntable (11), the turntable (11) is slidably connected to the longitudinal slide (14), and a locking device (12) is provided on the turntable (11); A transverse slide (15) is provided at the lower side of the longitudinal slide (14), and the longitudinal slide (14) drives the turntable (11) to slide longitudinally. A base (16) is provided at the lower side of the transverse slide (15), and the transverse slide (15) drives the longitudinal slide (14) and the turntable (11) to slide transversely.

4. The method for fine machining a powder metallurgy bearing for a micro fan after sintering and forming according to claim 2, characterized in that: The workpiece rack (2) comprises a chassis (21), a turning seat (22) and a workpiece fixture (23), wherein at least one turning seat (22) is provided and all are slidably connected to the chassis (21); The flip seat (22) is used to adjust the angle of the workpiece clamp (23); a driving component is provided on the flip seat (22); the driving component is used to control the opening, closing and rotation of the workpiece clamp (23).

5. The method for fine machining a powder metallurgy bearing for a micro fan after sintering and forming according to claim 4, characterized in that: The driving assembly comprises a rotating motor (24) and a telescopic motor (25); the workpiece clamp (23) is arranged on one side of an adjustment seat (26); and a locking sleeve (231) adapted to the workpiece clamp (23) is provided on the adjustment seat (26); The telescopic motor (25) controls the axial movement of the workpiece clamp (23); one end of the workpiece clamp (23) is an elastic clamp; the locking sleeve (231) is used to cooperate with the elastic clamp to clamp the bearing workpiece; a transmission device (241) is provided on the outside of the locking sleeve (231); and the rotating motor (24) drives the locking sleeve (231) to rotate via the transmission device (241).

6. The method for fine machining a powder metallurgy bearing for a micro fan after sintering and forming according to claim 2, characterized in that: The workpiece tray (5) comprises a carrier tray (51) and an oil tray (52); an arc-shaped groove is provided at the bottom of the carrier tray (51); an oil drain screen (511) is provided on one side of the arc-shaped groove; an oil change valve (521) is provided on one side of the oil tray (52); and the carrier tray (51) is embedded on the upper side of the oil tray (52).

7. The method for fine machining a powder metallurgy bearing for a micro fan after sintering and forming according to claim 2, characterized in that: A loading device (4) is provided on the side of the workpiece plate (5) facing away from the tool platform (1), and a vibration plate (3) is provided on one side of the loading device (4); The loading device (4) comprises a loading tray (41) and an adjustment bracket (42); the loading tray (41) comprises a positioning roller (411), a recovery tray (412) and a conveyor belt (413).

8. The method for fine machining a powder metallurgy bearing for a micro fan after sintering according to claim 7, characterized in that: The positioning rollers (411) are provided in a plurality of groups and arranged in an array on the upper side of the recovery tray (412); the conveyor belt (413) is arranged between the plurality of groups of positioning rollers (411); and a driving device (43) is provided at one end of the conveyor belt (413); The recovery tray (412) is slidably connected to the adjustment bracket (42), and a lifting rod is provided on the lower side of the adjustment bracket (42).

9. A method for fine machining a powder metallurgy bearing for a micro fan after sintering according to any one of claims 1 to 8, characterized in that: The processing technology in steps S3, S4 and S5 specifically includes: A. The vibrating plate (3) automatically loads the material, and the sintered bearing falls on the positioning roller (411). During the rotation of the conveyor belt (413), the bearing is driven to move, and the bearing is gradually straightened and arranged along the gap between the positioning rollers (411). At the same time, the bearing is pushed to one side under the drive of the conveyor belt (413); B. The turning seat (22) slides on the chassis (21) to adjust the height, and at the same time, the turning seat (22) rotates to adjust the angle of the workpiece fixture (23) until the workpiece fixture (23) is aligned with the bearing, and the recovery tray (412) is moved to bring the bearing close to the workpiece fixture (23). The telescopic motor (25) controls the workpiece fixture (23) to clamp, and the clamping is completed; C. The turning seat (22) drives the workpiece fixture (23) to swing, causing the bearing to contact the lubricating oil in the arc groove of the carrier plate (51), and the rotating motor (24) drives the bearing to rotate through the workpiece fixture (23) to throw out excess lubricating oil, and then the turning seat (22) rotates to control the workpiece fixture (23) to align with the tool table (1); D. Adjust the tool table (1), switch the boring tool, bore out the oil storage groove on the inner side of the bearing, and at the same time, fine-machine the inner assembly surface of the bearing. Repeat step C again, immerse the bearing in oil, clean the bearing, switch the turning tool, grinding head or polishing head, and fine-machine the side curved surface and end surface of one end of the bearing. E. Adjust the bearing clamping direction and repeat step D to perform fine machining on the other end of the bearing. To ensure machining reliability, the clamping depth of the workpiece fixture (23) is 1 / 3 to 1 / 2 of the bearing length. F. The turning seat (22) rotates, the workpiece fixture (23) swings down, the bearing is released, and the bearing falls into the carrier plate (51).

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