Abrasive flow finishing device for precision inner ring groove

Abstract

The present invention discloses an abrasive flow finishing device for precision inner hole annular grooves, belonging to the field of abrasive flow processing technology. The device comprises an upper end cover, a lower end cover, a cylinder and an isolation plate. The isolation plate is detachably connected to a converter. The lower end of a part is screwed into the converter. A center body is connected to the interior of the part. The surface of the center body is provided with an abrasive flow annular groove. A radial small hole is provided at the bottom of the abrasive flow annular groove. A groove is provided on the outer cylindrical surface of the center body for connecting the abrasive flow annular groove with the inner hole annular groove of the part. A blind hole 1 is provided at the upper end of the center body to communicate with the radial small hole. A radial large hole is provided on the outer cylindrical surface of the center body to communicate with the inner hole annular groove of the part. A blind hole 2 is provided at the lower end of the center body to communicate with the radial large hole. The present invention constructs a functional abrasive flow channel by rationally designing the center body, realizes friction between abrasive particles and the wall surface of the part, and ensures the uniqueness of the abrasive flow channel, thereby achieving finishing processing of precision inner hole annular grooves.

Description

Technical Field

[0001] The invention relates to the technical field of precision inner hole annular groove finishing processing, and in particular to an abrasive flow finishing processing device for precision inner hole annular groove. Background Art

[0002] With the rapid development of hydraulic technology, in order to enhance the efficiency and stability of the system, the requirements for the size and surface finish of system parts are becoming increasingly higher. Especially in the automotive, aviation and aerospace fields, the stability of the hydraulic system is directly related to life safety and project success, which in turn depends on the large number of high-precision parts inside it. Among them, the more typical parts are joints that play the role of sealing and oil circuit conversion. For example, the rotary joint in the aircraft hydraulic system has a complex internal hole structure and contains multiple sets of ring grooves. The internal hole and the bottom of the ring groove are all high-precision dimensions (8-level accuracy) and high surface finish requirements (Ra0.2 and Ra0.4). Figure 1 For this type of feature, traditional machining methods are difficult to meet the relevant design requirements, and completing the finishing process at the bottom of the ring groove is even more difficult. These limitations will directly affect the delivery cycle and qualification rate of parts.

[0003] In order to solve the defects of traditional mechanical processing methods in surface finish of such high-precision inner ring grooves, researchers have previously used abrasive flow machining technology to improve the surface finish of parts to meet design requirements. However, there is still a lack of relevant technical exploration for abrasive flow finishing of inner ring grooves.

[0004] On October 26, 2021, the applicant submitted a patent with publication number CN114012591A, entitled "A device and method for abrasive flow machining of blind hole parts". The technical content is: A device and method for abrasive flow machining of blind hole parts, belonging to the field of manufacturing and processing technology. It includes a lower end cover, an upper end cover, and a cylinder arranged between the upper end cover and the lower end cover. The inner cover of the cylinder is provided with an isolation plate, a joint, a drainage pipe and a blind hole part; the lower end cover is provided with a plurality of drainage holes, the isolation plate is connected to the upper step surface of the lower end cover, and the center of the isolation plate is provided with a central large hole and a plurality of connection holes for matching with the joint. The joint is a hollow structure, and its lower end is detachably fixedly connected to the connection hole. The drainage pipe passes through the joint and the isolation plate and is connected to the drainage hole installed in the lower end cover. The blind hole part can be connected to the upper end of the joint after the drainage pipe is inserted into its inner hole.

[0005] The above patent is an abrasive flow machining device designed by the applicant for blind hole parts. In response to the above problems existing in the inner hole ring groove in the prior art, the present invention studies an abrasive flow finishing machining device for precision inner hole ring grooves. By constructing an abrasive flow channel, it realizes the finishing machining of the inner hole ring groove features, and also fills the technical gap in related aspects of abrasive flow machining. Summary of the Invention

[0006] The present invention aims to solve the problem that traditional mechanical processing methods in the existing technology are difficult to meet the surface finish requirements of the inner hole ring groove of high-precision parts, and proposes an abrasive flow finishing processing device for precision inner hole ring grooves. The present invention ensures the uniqueness of the abrasive flow channel through the reasonable design of the center body, thereby realizing the finishing processing of the precision inner hole ring groove.

[0007] In order to achieve the above-mentioned object of the invention, the technical solution of the present invention is as follows:

[0008] The cam is secured to the upper and lower surfaces of the machine tool so that the cam is secured to the upper and lower surfaces of the machine tool and the cam is secured thereto.

[0009] In one embodiment, a motor is mounted on the lower end cover, and the front end of the motor shaft passes through the lower end cover and enters the adapter on the isolation plate, and is fixedly connected to the central body.

[0010] In a certain embodiment, the center body and the inner hole of the part are clearance-fitted, and a sealing ring groove is provided at each end of the center body, avoiding the position of the ring groove in the inner hole of the part, for installing an O-ring, so as to prevent abrasives and their oil components from entering the inner cavity of the part through the installation gap between the center body and the part.

[0011] In a certain embodiment, a motor cover and a motor cover rubber pad are provided on the outside of the motor, and the motor cover and the motor cover rubber pad are fixedly connected to the lower end surface of the lower end cover to prevent the abrasive and its oil components from damaging the motor; an internal wiring channel is provided inside the lower end cover, and the power line and the control line are connected to the motor after passing through the internal channel of the lower end cover.

[0012] In a certain embodiment, a sun gear is fixedly connected to the motor shaft, a number of planetary gears are meshed around the sun gear, and a gear cover and a gear cover rubber pad are fixedly connected to the upper surface of the lower end cover; the long axis and short axis of the planetary gear are respectively rotatably connected to the gear cover and the lower end cover through bearings.

[0013] In a certain embodiment, a bearing mounting blind hole is provided on the lower end cover corresponding to the short shaft end bearing; a plurality of step holes are provided on the gear cover corresponding to the long shaft end bearing, and the long axis of the planetary gear passes through the step holes and enters the adapter at the corresponding position and is fixedly connected to the center body inside the adapter.

[0014] In one embodiment, the sun gear is mounted on the stepped surface of the motor shaft, and the sun gear and the motor shaft are rotationally limited and axially limited respectively by a key and a nut.

[0015] In one embodiment, the stepped hole of the gear cover forms a boss on its upper surface, and a felt passing through the long axis of the planetary gear is provided at the opening of the boss. A clamping nut passes through the long axis of the planetary gear to tighten the felt to prevent abrasives and their oil components from contaminating the working environment of the gear set.

[0016] In one embodiment, a connecting hole is provided at the bottom of the central body, and the central body, the motor shaft and the planetary gear long axis are fixedly connected by threads, and the thread rotation direction of the connecting hole is opposite to the rotation direction of the motor shaft.

[0017] In one embodiment, the cylinder is placed on the upper end surface of the isolation plate, and its lower end surface is lower than the upper end surface of the lower end cover, and the upper end surface of the cylinder is in contact with the stepped sunken end surface of the upper end cover.

[0018] In summary, the present invention has the following advantages:

[0019] 1. The device of the present invention overcomes the technical background deficiency of abrasive flow machining technology for finishing of precision inner hole annular grooves. By rationally designing the central body and constructing a functional abrasive flow channel, the present invention realizes the friction between the abrasive particles and the wall surface of the part, while ensuring the uniqueness of the abrasive flow channel, thus achieving finishing of precision inner hole annular grooves.

[0020] 2. The present invention introduces a gear set (sun gear and planetary gear) that is driven by a motor to achieve group processing of parts. The torque transmission of the gear set is stable, ensuring good consistency of processing results. Combined with the rotational motion transmitted by the motor, the number of frictions between the abrasive particles in the abrasive and the inner hole and the inner hole ring groove of the part per unit time is increased, greatly improving processing efficiency.

[0021] 3. During the processing of the present invention, the device and parts are completely wrapped by the abrasive. Due to the shock-absorbing effect of the abrasive, the entire processing process can be made more stable;

[0022] 4. The present invention can meet the finishing processing requirements of similar parts of multiple specifications by replacing the adapter and the center body, thereby improving the versatility of the device and reducing the manufacturing cost;

[0023] 5. In the present invention, since the power switch and controller of the motor are located outside the device, the motor operating parameters can be adjusted in real time, making the processing more controllable;

[0024] 6. The parts replacement process of the device of the present invention is simple, which avoids frequent movement of the device, improves safety, and shortens the preparation period;

[0025] 7. The components of the device of the present invention are mostly connected by threaded connections and hole-axis clearance fit, which makes installation and disassembly simple, highly operable and maintainable. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below with reference to the accompanying drawings and examples.

[0027] Figure 1 This is a schematic diagram of a part targeted by an abrasive flow finishing device for precision inner ring grooves of the present invention;

[0028] Figure 2 This is an axonometric view of an abrasive flow finishing device for precision inner ring grooves according to the present invention;

[0029] Figure 3 This is an exploded isometric view of an abrasive flow finishing device for precision inner ring grooves according to the present invention;

[0030] Figure 4 This is a schematic structural diagram of the lower end cover of an abrasive flow finishing device for precision inner hole ring grooves according to the present invention;

[0031] Figure 5 This is a schematic diagram of the internal structure of the central body of an abrasive flow finishing device for precision inner hole ring grooves of the present invention;

[0032] Figure 6 This is a schematic diagram of the external structure of the central body of an abrasive flow finishing device for precision inner hole ring grooves of the present invention;

[0033] Figure 7 This is a schematic diagram of a gear set of an abrasive flow finishing device for precision inner ring grooves according to the present invention;

[0034] Figure 8 This is a schematic diagram of the motor installation of an abrasive flow finishing device for precision inner ring grooves of the present invention;

[0035] Figure 9 This is a schematic diagram of the installation of a gear set of an abrasive flow finishing device for precision inner ring grooves of the present invention;

[0036] Figure 10 This is a schematic diagram of the installation of parts of an abrasive flow finishing device for precision inner ring grooves of the present invention;

[0037] Figure 11 This is a cross-sectional view of an abrasive flow finishing device for precision inner hole ring grooves according to the present invention;

[0038] Figure 12 This is a schematic diagram of the working principle of the abrasive flow finishing device for precision inner ring groove of the present invention. Figure 1 ;

[0039] Figure 13 This is a schematic diagram of the working principle of the abrasive flow finishing device for precision inner ring groove of the present invention. Figure 2 .

[0040] Description of reference numerals:

[0041] In the figure, 1 is a bolt, 2 is a motor cover, 3 is a rubber pad for the motor cover, 4 is a motor, 5 is a power line and a control line, 6 is a key, 7 is a lower end cover, 8 is a bearing, 9 is a sun gear, 10 is a planetary gear, 11 is a nut, 12 is a rubber pad for the gear cover, 13 is a gear cover, 14 is a felt, 15 is a pressing nut, 16 is a spacer, 17 is a locating pin, 18 is a adapter, 19 is an O-ring, 20 is a center body, 21 is a part, 22 is a cylinder, 23 is an upper end cover, 24 is a blind hole 1, 25 is a blind hole 2, 26 is a connecting hole, 27 is a groove, 28 is a piston, 29 is a workbench, 30 is a abrasive cylinder, 31 is a sealing ring groove, 32 is a abrasive flow ring groove, 33 is a radial small hole, and 34 is a radial large hole. DETAILED DESCRIPTION

[0042] The present invention will be further described in detail below with reference to the examples, but the embodiments of the present invention are not limited thereto.

[0043] Example 1

[0044] This embodiment provides an abrasive flow finishing device for precision inner ring grooves. The processing device is used to process Figure 1 The part 21 shown has multiple sets of inner hole ring grooves, and the inner holes and the bottoms of the ring grooves are both of high-precision dimensions (grade 8 accuracy) and high surface finish requirements (Ra0.2 and Ra0.4).

[0045] like Figure 2The figure shows an axonometric view of the processing device of the present invention, which primarily comprises an upper end cap 23, a lower end cap 7, a cylinder 22 disposed between the upper and lower end caps 23 and 7, and an isolation plate 16. The isolation plate 16 is mounted on the stepped, sunken end surface of the lower end cap 7, leaving a cavity between the isolation plate 16 and the bottom of the lower end cap 7. Two locating pins 17 are used to position the isolation plate 16 and the lower end cap 7. The cylinder 22 is placed on the upper end surface of the isolation plate 16, with its lower end surface lower than the upper end surface of the lower end cap 7. The upper end surface of the cylinder 22 aligns with the stepped, sunken end surface of the upper end cap 23, primarily to prevent the fixture from slipping during the clamping process and avoid potential safety hazards.

[0046] Figure 11 The figure shows a cross-sectional view of the structure of the processing device. The processing device of the present invention is placed on the lower worktable of an abrasive flow machining machine, with the lower end surface of the lower end cover 7 aligned with the lower worktable surface of the machine, and the portion below the lower end surface of the lower end cover 7 falling into the lower abrasive cylinder of the abrasive flow machining machine. Driven by the machine's hydraulic system, the upper worktable acts on the upper end cover 23, clamping the finishing device between the upper and lower worktables of the machine. This creates a single reciprocating abrasive flow channel between the lower abrasive cylinder, the processing device, and the upper abrasive cylinder of the machine, thus achieving the structure of the abrasive flow channel.

[0047] like Figure 4 The figure shows a schematic structural diagram of the lower end cover 7. The lower end cover 7 is a shell structure with a stepped inner cavity. Four evenly distributed fan-shaped cavities are opened at the bottom. The area of ​​all fan-shaped cavities accounts for about 40% of the area of ​​the lower end surface of the lower end cover 7 to ensure the smooth flow of abrasive.

[0048] A through hole is formed in the isolation plate 16, into which an adapter 18 is detachably connected. The adapter 18 is a hollow structure that communicates with the internal cavity of the lower end cap 7. To improve processing efficiency, multiple through holes and adapters 18 can be provided in the isolation plate 16 according to the number of parts 21.

[0049] like Figure 11 As shown, the adapter 18 is connected to the part 21 to be processed and the center body 20. The adapter 18 passes through the center body 20 and is installed on the isolation plate 16 through a threaded connection. The inner hole of the part 21 passes through the center body 20 and is installed on the adapter 18 through a threaded connection. A clearance fit is adopted between the center body 20 and the part 21.

[0050] like Figure 5 and Figure 6 The figure shows the structure of the center body 20. The center body 20 is a solid cylindrical structure. At each end, a sealing ring groove 31 is provided in the area where the inner ring groove of the component 21 is located. The sealing groove 31 is used to install the O-ring 19. This prevents the abrasive and its oil components from entering the inner cavity through the installation gap between the center body 20 and the component 21, thereby affecting the processing effect. At the same time, it ensures the uniqueness of the abrasive channel.

[0051] Between the two sealing ring grooves 31 are four abrasive flow grooves 32 (the actual number of rings is determined by the number of ring grooves in the inner bore of the part 21 to be machined). These grooves 32 form a quasi-complementary structure with the inner bore grooves of the part 21. When the center body 20 is installed, these four abrasive flow grooves 32 precisely avoid the five inner bore grooves of the part.

[0052] like Figure 5 As shown, a radial small hole 33 is provided at the bottom of the abrasive flow annular groove 32, and a 2 mm deep groove 27 is provided on the outer cylindrical surface of the center body 20 for connecting the abrasive flow annular groove 32 and the inner hole annular groove of the part 21. A blind hole 1 24 is provided at the upper end of the center body 20 to communicate with the radial small hole 33; a radial large hole 34 is provided on the outer cylindrical surface of the center body 20 to communicate with the inner hole annular groove of the part 21, and a blind hole 2 25 is provided at the lower end of the center body 20 to communicate with the radial large hole 34.

[0053] By means of the novel design of the abrasive flow channel structure on the central body 20, the residence time of the abrasive inside the part 21 can be prolonged, thereby achieving a better processing effect.

[0054] In this embodiment, the working principle of the processing device is as follows:

[0055] like Figure 12 As shown, the processing program is started. Under the action of the machine tool hydraulic system, the lower abrasive cylinder piston 28 moves upward and pushes the abrasive to flow. The abrasive flows through the four fan-shaped cavities of the lower end cover 7 and then enters the interlayer between the lower end cover 7 and the isolation plate 16. As the abrasive accumulates, the abrasive enters the inner hole of the adapter 18 and flows through the lower end blind hole 25 of the center body 20, and then flows into the inner hole annular groove of the part 21 through the large radial hole 34 of the center body 20. Under the extrusion action of the machine tool, the abrasive flows in the inner hole annular groove of the part 21, realizing the finishing processing of the inner hole annular groove of the part 21 by the abrasive.

[0056] The abrasive continues to flow until it fills the annular groove in the inner hole of component 21. It then flows through the groove 27 on the outer wall of the center body 20 into the annular groove on the outer cylindrical surface of the center body 20. It then flows through the radial aperture 33 into the second blind hole 25 at the upper end of the center body 20. It then enters the cavity formed between the isolation plate 16, the cylinder 22, and the upper end cap 23, where it accumulates until all the gaps are filled. After flowing through the center hole of the upper end cap 23, the abrasive enters the upper abrasive cylinder and pushes the upper abrasive cylinder piston 28 upward until the lower abrasive cylinder moves to the limit area, completing the one-way flow of the abrasive.

[0057] exist Figure 13During the operation, the machine tool hydraulically drives the steering wheel, causing the piston 28 of the upper abrasive cylinder to move downward and push the abrasive to flow. The abrasive flows through the blind hole 1 24 at the upper end of the center body 20 and then enters the inner hole of the part 21 through the radial small hole 33 in the annular groove on the outer cylindrical surface of the center body 20. Under the extrusion of the machine tool, the abrasive flows in the inner hole of the part 21, completing the finishing process of the inner hole of the part 21. The abrasive continues to flow through the groove 27 and radial large hole 34 on the outer wall of the center body 20 into the blind hole 2 25 at the lower end of the center body 20, enters the interlayer between the lower end cover 7 and the isolation plate 16, and finally flows into the lower abrasive cylinder through the four sector-shaped cavities of the lower end cover 7 until the upper abrasive cylinder moves to the limit area, completing the reciprocating flow of the abrasive.

[0058] Example 2

[0059] This embodiment provides an abrasive flow finishing device for precision inner ring grooves. The processing device is used to process Figure 1 The part 21 shown has multiple sets of inner hole ring grooves, and the inner holes and the bottoms of the ring grooves are both of high-precision dimensions (grade 8 accuracy) and high surface finish requirements (Ra0.2 and Ra0.4).

[0060] On the basis of Example 1, in order to improve the efficiency of parts processing, a motor 4 is installed on the lower end cover 7, as shown in FIG. Figure 4 As shown, a wiring harness channel is provided inside the lower end cover 7 for installing and connecting the power cord and control cable 5 of the motor 4. The power cord and control cable 5 pass through the internal channel of the lower end cover 7 and then connect to the motor 4, eliminating the impact of abrasive flow on the wired connection and enabling real-time adjustment of the operating parameters of the motor 4, thereby achieving effective control of the machining process.

[0061] like Figure 8 The figure shows the installation diagram of motor 4. The lower end cover 7 is provided with a center hole. The motor 4 shaft passes through the center hole of the lower end cover 7 and is mounted to the lower end surface of the lower end cover 7 via bolts 1. The motor 4 shaft and the center hole of the lower end cover 7 are clearance-fitted to ensure normal operation of the motor 4. A motor cover 2 and a motor cover rubber pad 3 are provided on the outside of the motor 4. The motor cover 2 and the motor cover rubber pad 3 are fixed to the lower end cover 7 via four array-distributed bolts 1. The motor cover rubber pad 3 is installed between the motor cover 2 and the lower end cover 7 to prevent abrasives and their oil components from entering the motor cover 2 and causing damage to the motor 4. Under the pressure of the abrasive, the motor cover 2 exerts end-face compression on the motor cover rubber pad 3, enhancing the sealing effect.

[0062] Figure 10 The figure shows the installation diagram of part 21. As shown in the figure, two O-rings 19 are respectively installed in the two rubber ring grooves of the center body 20. The center body 20 is connected to the shaft of the motor 4 through a thread. The rotation direction of the thread is opposite to the rotation direction of the shaft of the motor 4 to ensure that the center body 20 will not loosen during rotation.

[0063] In this embodiment, the working principle of the processing device is as follows:

[0064] like Figure 12 As shown, the power line and control line 5 are connected to the power supply and controller. Before the machining program is started, the motor 4 is started, causing the center body 20 to rotate at a certain speed driven by the rotating shaft of the motor 4. When the machining program is started, under the action of the machine tool hydraulic system, the lower abrasive cylinder piston 28 moves upward and pushes the abrasive to flow. The abrasive flows through the four sector-shaped cavities of the lower end cover 7 and then enters the interlayer between the lower end cover 7 and the isolation plate 16. As the abrasive accumulates, the abrasive enters the inner hole of the adapter 18 and flows through the second blind hole 25 at the lower end of the center body 20. Then, through the large radial hole 34 of the center body 20, it flows into the inner ring groove of the part 21. Under the extrusion of the machine tool and the rotation of the center body 20, the abrasive flows in the inner ring groove of the part 21, completing the finishing process of the inner ring groove of the part 21 by the abrasive. The abrasive continues to flow until it fills the inner annular groove of component 21, flows through the outer wall groove 27 of center body 20 into the outer cylindrical annular groove of center body 20, and then flows through the radial holes into blind hole 1 24 at the upper end of center body 20. It then enters the cavity formed between isolation plate 16, cylinder 22, and upper end cover 23, where it accumulates until all the gaps are filled. After flowing through the center hole of upper end cover 23, the abrasive enters the upper abrasive cylinder, pushing the piston 28 of the upper abrasive cylinder upward until the lower abrasive cylinder moves to the limit area, completing the one-way flow of the abrasive.

[0065] exist Figure 13 During the machining process, the machine tool hydraulically drives the steering wheel, causing the piston 28 of the upper abrasive cylinder to move downward and push the abrasive to flow. The abrasive flows through the blind hole 1 24 at the upper end of the center body 20 and then enters the inner hole of the part 21 through the radial small hole 33 in the annular groove on the outer cylindrical surface of the center body 20. Under the extrusion of the machine tool and the rotation of the center body 20, the abrasive flows in the inner hole of the part 21, completing the finishing process of the inner hole of the part 21. The abrasive continues to flow through the groove 27 and the radial large hole 34 on the outer wall of the center body 20 and flows into the blind hole 2 25 at the lower end of the center body 20, entering the interlayer between the lower end cover 7 and the isolation plate 16, and finally flowing into the lower abrasive cylinder through the four sector-shaped cavities of the lower end cover 7 until the upper abrasive cylinder moves to the limit area, completing the reciprocating flow of the abrasive.

[0066] Example 3

[0067] This embodiment provides an abrasive flow finishing apparatus for precision inner ring grooves. Furthermore, in order to realize group processing of parts 21, a gear set structure is also designed in this embodiment based on embodiment 2.

[0068] like Figure 3The figure shows an exploded axonometric view of the processing device, including: bolt 1, motor cover 2, motor cover rubber pad 3, motor 4, power line and control line 5, key 6, lower end cover 7, bearing 8, sun gear 9, planetary gear 10, nut 11, gear cover rubber pad 12, gear cover 13, felt 14, tightening nut 15, isolation plate 16, locating pin 17, adapter 18, O-ring 19, center body 20, part 21, cylinder 22, and upper end cover 23.

[0069] like Figure 9 The figure shows the structure of the gear set. The upper end of the motor 4 shaft passes through the lower end cover 7. A sun gear 9 is mounted on the stepped surface of the motor 4 shaft. The sun gear 9 is connected to the motor 4 shaft and is limited by a key 6 and a nut 11. Specifically, the sun gear 9 and the motor 4 shaft are rotationally limited by the key 6, and the sun gear 9 is axially limited by the nut 11. A plurality of planetary gears 10 are meshed around the sun gear 9. Specifically, in this embodiment, Figure 7 It shows that four planetary gears 10 are distributed in an array around the sun gear 9. Through this structural setting, group processing of parts 21 can be achieved, and torque transmission through gears has good stability, ensuring consistency of processing effects.

[0070] A gear cover 13 and a rubber ring of the gear cover 13 are fixedly provided on the upper surface of the lower end cover 7. The long axis and short axis of each planetary gear 10 are rotatably connected to the gear cover 13 and the lower end cover 7 respectively through bearings 8. Figure 9 The figure shows the installation diagram of the gear set. Each of the four planetary gears 10 has a bearing 8 mounted on its long and short shaft stepped surfaces. The short shaft end bearings follow the planetary gears 10 and are installed in the bearing 8 mounting blind holes in the lower end cover 7. During installation, effective engagement between the sun gear 9 and the four planetary gears 10 must be ensured to achieve torque transmission. Stepped holes are provided on the gear cover 13 corresponding to the long axes of the planetary gears 10. These four stepped holes on the gear cover 13 pass through the long axes of the four planetary gears 10, and the long shaft end bearings of the planetary gears 10 fall into these stepped holes. Correspondingly, multiple adapters 18 are also provided on the isolation plate 16 corresponding to the planetary gears 10. The front ends of the long axes of the planetary gears 10 pass through these stepped holes and enter the adapters 18 at the corresponding positions on the isolation plate 16, where they are fixedly connected to the central body 20 within the corresponding adapters 18.

[0071] The gear cover rubber pad 12 and gear cover 13 are secured to the inner end surface of the lower end cover 7 via four bolts 1 arranged in an array. The stepped hole in the gear cover 13 forms a boss on its upper surface. Four felts 14 extend through the long axis of the planetary gear 10 and are placed on the four bosses on the gear cover 13, covering the openings of the stepped hole. The felts 14 are then compressed by compression nuts 15 that extend through the long axis of the planetary gear 10. The gear cover rubber pad 12 and felt 14 are primarily used to prevent abrasives and their oil components from contaminating the gear train's operating environment.

[0072] In this embodiment, the working principle of the processing device is as follows:

[0073] exist Figure 12 In the figure, the power line and the control line 5 are connected to the power supply and the controller. Before the machining program is started, the motor 4 is started. The rotation of the motor 4 shaft drives the planetary gears 10 meshing with the sun gear 9, causing each center body 20 to rotate at a certain speed driven by the motor 4 shaft. When the machining program is started, under the action of the machine tool hydraulic system, the piston of the lower abrasive cylinder moves upward and pushes the abrasive to flow. The abrasive flows through the four sector-shaped cavities of the lower end cover 7 and then enters the interlayer between the lower end cover 7 and the isolation plate 16. As the abrasive accumulates, the abrasive enters the inner holes of each adapter 18 and flows through the second blind hole 25 at the lower end of the center body 20. Then, it flows through the large radial hole 34 of the center body 20 and flows into the inner ring groove of the part 21. Under the extrusion of the machine tool and the rotation of the center body 20, the abrasive flows in the inner ring groove of the part 21, achieving the finishing processing of the inner ring groove of the part 21 by the abrasive. The abrasive continues to flow until it fills the inner annular groove of component 21, flows through the outer wall groove 27 of center body 20, and then flows through the radial aperture 33 into the blind hole 24 at the upper end of center body 20. It then enters the cavity formed between isolation plate 16, cylinder 22, and upper end cap 23, where it accumulates until all the gaps are filled. After flowing through the center hole of upper end cap 23, the abrasive enters the upper abrasive cylinder and pushes the upper abrasive cylinder piston upward until the lower abrasive cylinder moves to the limit area, completing the one-way flow of the abrasive.

[0074] exist Figure 13 During the machining process, the machine tool hydraulically drives the steering wheel, causing the piston of the upper abrasive cylinder to move downward and push the abrasive to flow. The abrasive flows through the blind hole 1 24 at the upper end of the center body 20 and then enters the inner hole of the part 21 through the radial small hole 33 in the annular groove on the outer cylindrical surface of the center body 20. Under the extrusion of the machine tool and the rotation of the center body 20, the abrasive flows in the inner hole of the part 21, completing the finishing process of the inner hole of the part 21. The abrasive continues to flow through the groove 27 and the radial large hole 34 on the outer wall of the center body 20 and flows into the blind hole 2 25 at the lower end of the center body 20, entering the interlayer between the lower end cover 7 and the isolation plate 16, and finally flowing into the lower abrasive cylinder through the four sector-shaped cavities of the lower end cover 7 until the upper abrasive cylinder moves to the limit area, completing the reciprocating flow of the abrasive.

[0075] After the machining program is finished, the power cord and the control line 5 are cut off to stop the motor 4. Under the action of the hydraulic system of the machine tool, the upper workbench 29 is separated from the upper end cover 23, and the upper end cover 23 and the cylinder 22 of the device are disassembled. During the disassembly process, the residual abrasive inside the device is cleaned, and the part 21 is removed and cleaned.

[0076] Although the specific embodiments of the present invention are described in detail in conjunction with the accompanying drawings, this should not be construed as limiting the scope of protection of this patent. Within the scope described by the claims, various modifications and variations that can be made by those skilled in the art without creative work still fall within the scope of protection of this patent.

[0077] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Any simple modification or equivalent change made to the above embodiment based on the technical essence of the present invention shall fall within the scope of protection of the present invention.

Claims

1. An abrasive flow finishing device for precision inner hole ring grooves, comprising an upper end cover (23), a lower end cover (7), and a cylinder (22) and a separation plate (16) installed therebetween, wherein the upper end cover (23) and the lower end cover (7) cooperate with the upper and lower worktables of a machine tool, respectively, so that the abrasive cylinder, the processing device and the lower abrasive cylinder of the machine tool form a reciprocating flow channel for abrasives; characterized in that: The isolation plate (16) is connected to the lower end cover (7), and a hollow adapter (18) is connected to the isolation plate (16). The lower end of the part (21) is connected to the adapter (18). A central body (20) is provided inside the part (21). The surface of the central body (20) is provided with an abrasive flow ring groove that avoids the inner hole ring groove of the part (21). A radial small hole (33) is provided at the bottom of the abrasive flow ring groove. A groove (27) is provided on the outer cylindrical surface of the central body (20) for connecting the abrasive flow ring groove and the inner hole ring groove of the part (21). A blind hole (24) is provided at the upper end of the central body (20) and is connected to the radial small hole (33); a groove (27) is provided on the outer cylindrical surface of the central body (20) for connecting the abrasive flow ring groove and the inner hole ring groove of the part (21). A radial large hole (34) is connected to the annular groove, and a blind hole (25) is opened at the lower end of the center body (20) and is connected to the radial large hole (34); a motor (4) is installed on the lower end cover (7), and the front end of the motor (4) shaft passes through the lower end cover (7) and enters the adapter (18) on the isolation plate (16) and is fixedly connected to the center body (20); a sun gear (9) is fixedly connected to the motor (4) shaft, and a plurality of planetary gears (10) are meshed around the sun gear (9); a gear cover (13) and a gear cover rubber pad (12) are fixedly connected to the upper surface of the lower end cover (7); the major axis and minor axis of the planetary gear (10) are rotatably connected to the gear cover (13) and the lower end cover (7) respectively through bearings (8).

2. The abrasive flow finishing device for precision inner ring groove according to claim 1, characterized in that: The center body (20) and the inner hole of the part (21) are clearance-fitted, and a sealing ring groove (31) is respectively provided at both ends of the center body (20) to avoid the position of the ring groove of the inner hole of the part (21) for installing an O-ring, so as to prevent abrasive and its oil components from entering the inner cavity of the part (21) through the installation gap between the center body (20) and the part (21).

3. The abrasive flow finishing device for precision inner ring groove according to claim 1, characterized in that: The motor (4) is provided with a motor cover (2) and a motor cover rubber pad (3) on the outside. The motor cover (2) and the motor cover rubber pad (3) are fixedly connected to the lower end surface of the lower end cover (7) to prevent the abrasive and its oil components from damaging the motor (4). The lower end cover (7) is provided with an internal wiring channel. The power line and the control line (5) pass through the internal channel of the lower end cover (7) and are connected to the motor (4).

4. The abrasive flow finishing device for precision inner ring groove according to claim 1, characterized in that: A bearing (8) mounting blind hole is provided on the lower end cover (7) corresponding to the short-axis end bearing; a plurality of step holes are provided on the gear cover (13) corresponding to the long-axis end bearing, and a plurality of adapters (18) are provided on the isolation plate (16) corresponding to the planetary gear (10); the long axis of the planetary gear (10) passes through the corresponding step hole and enters the adapter (18) at the corresponding position on the isolation plate (16), and is fixedly connected to the central body (20) in the adapter (18).

5. The abrasive flow finishing device for precision inner ring groove according to claim 1, characterized in that: The sun gear (9) is mounted on the stepped surface of the rotating shaft of the motor (4), and the sun gear (9) and the motor (4) are respectively rotationally limited and axially limited by a key (6) and a nut (11).

6. The abrasive flow finishing device for precision inner ring groove according to claim 4, characterized in that: The stepped hole of the gear cover (13) forms a boss on its upper surface, and the boss is covered with a felt (14) passing through the long axis of the planetary gear (10). A pressing nut (15) passes through the long axis of the planetary gear (10) to press the felt (14) to prevent abrasive and its oil components from contaminating the working environment of the gear set.

7. The abrasive flow finishing device for precision inner ring groove according to claim 4, characterized in that: A connecting hole (26) is provided at the bottom of the central body (20), and the central body (20), the rotating shaft of the motor (4), and the long axis of the planetary gear (10) are fixedly connected via threads, and the direction of rotation of the thread of the connecting hole (26) is opposite to the direction of rotation of the rotating shaft of the motor (4).

8. The abrasive flow finishing device for precision inner ring groove according to claim 1, characterized in that: The cylinder (22) is placed on the upper end surface of the isolation plate (16), and its lower end surface is lower than the upper end surface of the lower end cover (7). The upper end surface of the cylinder (22) is in contact with the stepped sunken end surface of the upper end cover (23).

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