A rudder casting inner wall polishing device

Abstract

This invention discloses a grinding and polishing device for the inner wall of a servo motor casting, belonging to the field of grinding or polishing technology. The device includes a servo motor casting body and a grinding mechanism inserted into its blind hole. The grinding mechanism includes a feed pipe, a return pipe, a connecting sleeve, a gooseneck return pipe, and a return assembly. A pulse solenoid valve is installed on the feed pipe. Damping sealing components are provided on the outer sides of the connecting sleeve and the return assembly. A moving component is provided at the end of the return assembly. During operation, the pulse solenoid valve causes periodic pulsations in the abrasive flow pressure within the feed pipe. These pulsations are transmitted to the blind hole and drive the gooseneck return pipe to generate radial micro-vibrations, causing dynamic changes in the annular gap between the outer wall of the gooseneck return pipe and the inner wall of the blind hole. This achieves dynamic full-coverage polishing of the inner wall of the blind hole. This invention solves the technical problem in existing abrasive flow devices where the outer wall of the return pipe easily adheres to the inner wall of the blind hole for a long time, resulting in localized polishing blind areas. It is suitable for efficient and precise polishing of the inner wall of deep blind holes in servo motor castings.

Description

Technical Field

[0001] This invention belongs to the field of grinding or polishing technology, specifically a grinding and polishing device for the inner wall of a servo motor casting. Background Technology

[0002] As a precision servo actuator widely used in modern industry, the servo motor's housing, or casting, usually has deep cavities inside to accommodate core components such as rotors, gear sets, and hydraulic blades. Since servo motor castings are mostly integrally cast, their inner walls inevitably have surface defects such as burrs, oxide scale, and microscopic unevenness, which directly affect the assembly accuracy, motion stability, and sealing performance of the servo motor. Therefore, the inner walls must be precision ground and polished before leaving the factory.

[0003] Abrasive flow machining is an advanced technology that uses semi-fixed abrasive media to reciprocate through the surface of a workpiece to achieve a smooth finish. It is widely used in the polishing of complex cavity surfaces in aerospace, medical, and automotive fields. However, for the blind hole structure commonly found in servo castings, abrasive flow polishing faces a recognized technical challenge: after the abrasive media enters the blind hole, it cannot form a through-flow path. The abrasive accumulates at the bottom of the blind hole, and its kinetic energy continuously decays, resulting in an extremely unsatisfactory polishing effect in the depths and sidewalls of the blind hole. Existing technologies include polishing solutions using pulsed abrasive flow, such as enhancing the turbulent kinetic energy of the fluid through high-speed intermittent abrasive supply, and rotary polishing devices for blind hole polishing, which drive the workpiece to rotate so that the abrasive flow collides more randomly with the inner wall of the blind hole. However, existing pulsed abrasive flow devices mostly use ejection mechanisms or mechanical pulse generators, which have limited pulse frequency and amplitude adjustment ranges, and lack a reasonable pressure transmission and buffering structure between the pulse generator and the abrasive delivery pipeline, making them unsuitable for fine polishing of the inner wall of deep blind holes. More importantly, there is no existing technology that utilizes pulse pressure to drive the flexible take-up tube to generate radial micro-vibration, thereby dynamically changing the annular gap between the outer wall of the take-up tube and the inner wall of the blind hole. Therefore, developing a grinding and polishing device for the inner wall of servo castings that can utilize pulse pressure to drive the flexible take-up tube to generate dynamic micro-vibration and achieve dynamic full-coverage polishing of the inner wall of the blind hole has significant engineering application value. Summary of the Invention

[0004] The purpose of this invention is to provide a grinding and polishing device for the inner wall of servo castings, so as to solve the technical problems mentioned in the background art, such as the attenuation of abrasive kinetic energy in blind holes and the tendency of the outer wall of the receiving tube to adhere to the inner wall of the blind hole for a long time, resulting in local polishing blind areas.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a grinding and polishing device for the inner wall of a servo motor casting, comprising a servo motor casting body and a grinding mechanism inserted into a blind hole inside the servo motor casting body. The grinding mechanism includes a feeding pipe, a recovery pipe, a connecting sleeve, a gooseneck receiving pipe, and a return assembly arranged sequentially from front to back. The connecting sleeve is inserted into the outer port of the blind hole. The feeding pipe and the recovery pipe are parallel to each other, and both the feeding pipe and the recovery pipe extend through the connecting sleeve into the blind hole. The return assembly is inserted into the end of the blind hole. The gooseneck receiving pipe is located between the recovery pipe and the return assembly. Both the connecting sleeve and the outside of the return assembly are provided with damping sealing components, and a moving component is provided on the outer surface of the end of the return assembly near the damping sealing component. A pulse solenoid valve is installed on the feeding pipe. The pulse solenoid valve is used to generate periodic pulsations in the abrasive flow pressure inside the feeding pipe. The periodic pulsations are transmitted to the blind hole and drive the gooseneck receiving pipe to generate radial micro-vibrations, so that the annular gap between the outer wall of the gooseneck receiving pipe and the inner wall of the blind hole changes dynamically with the pulse period.

[0006] Preferably, the reflux assembly includes a headstock, the front end of which is connected to the gooseneck receiving pipe. Several inflow grooves are arranged in a ring array on the outer surface of the headstock near the gooseneck receiving pipe. Abrasive particles flow through the inflow grooves into the headstock and are discharged through the gooseneck receiving pipe.

[0007] Preferably, both ends of the gooseneck receiving pipe are fixedly connected to the head seat and the recovery pipe via flanges.

[0008] Preferably, the movable component includes a plurality of mounting slots arranged in a ring array on the outer surface of the rear side of the headstock. Each of the mounting slots has a support arm rotatably mounted therein. Each of the support arms has a ball groove on the side facing the inner surface of the blind hole. Each of the ball grooves has a ball rolled in it. Each mounting slot has a metal spring sheet that abuts against the bottom of the inner cavity of the mounting slot and between the support arm. The ball abuts against the inner wall of the blind hole and rolls along the inner wall of the blind hole.

[0009] Preferably, the damping sealing assembly includes two limiting rings and two slip rings. The two limiting rings are respectively installed on the outer surfaces of the connecting sleeve and the head seat, and the two slip rings are respectively slidably installed on the outer surfaces of the connecting sleeve and the head seat. An adhesive strip is provided between the limiting rings and the slip rings. The first and last ends of the adhesive strip are respectively fixed between the limiting rings and the slip rings. The adhesive strip expands radially under the action of abrasive flow pressure to enhance the seal.

[0010] Preferably, the front end of the connecting sleeve is provided with a guide cone surface, which is used to guide the connecting sleeve to be inserted into the blind hole outer port.

[0011] Preferably, the gooseneck receiving tube includes a flexible tube body, and a plurality of supporting steel rings are equidistantly arranged inside the flexible tube body. The supporting steel rings are used to resist the radial pressure of the abrasive flow in the blind hole to keep the receiving channel of the gooseneck receiving tube unobstructed.

[0012] Preferably, the feeding pipe is a rigid pipe, the recycling pipe is a rigid pipe, and the feeding pipe and the recycling pipe are fixed together by pipe clamps.

[0013] Preferably, the pulse frequency of the pulse solenoid valve is 1-10Hz, and the pulse amplitude is ±15% to ±25% of the rated pressure.

[0014] Preferably, the outer wall of the gooseneck receiving tube is provided with a turbulence structure, which is a spiral ridge or an annular turbulence plate, used to generate local turbulence when the abrasive flow flows along the annular gap between the outer wall of the gooseneck receiving tube and the inner wall of the blind hole.

[0015] The beneficial effects of this invention are as follows: 1. This invention, through the coordinated operation of a pulse solenoid valve and a gooseneck take-up tube, achieves for the first time a polishing method that utilizes pulse pressure to drive the flexible take-up tube to generate radial micro-vibration, dynamically changing the annular gap between the outer wall of the take-up tube and the inner wall of the blind hole. The pulse solenoid valve causes the pressure of the abrasive flow in the feed pipe to pulsate periodically. After the pulsating pressure is transmitted to the inside of the blind hole, it drives the gooseneck receiving pipe to generate periodic radial micro-vibration, so that the annular gap between the outer wall of the gooseneck receiving pipe and the inner wall of the blind hole changes dynamically with the pulse period. This dynamic change has a triple synergistic effect: (1) The periodic change of the annular gap causes the flow state of the abrasive flow to be continuously disturbed, and the flow state is maintained in a turbulent state throughout the blind hole; (2) The micro-vibration of the gooseneck receiving pipe prevents its outer wall from being in long-term contact with a certain part of the inner wall of the blind hole, avoiding the local grinding blind area caused by the pipe wall blocking, and realizing dynamic full-coverage polishing of the inner wall of the blind hole; (3) The turbulence structure set on the outer wall of the gooseneck receiving pipe changes periodically in the intensity and mode of interaction with the abrasive flow during the dynamic change of the gap, further enhancing the randomness and complexity of the turbulence.

[0016] 2. This invention achieves smooth movement of the return assembly within the blind hole through a movable component. The movable component, located on the outer surface of the end of the return assembly, includes a mounting groove, a support arm, a metal spring, and ball bearings. The ball bearings abut against the inner wall of the blind hole and roll along the inner wall, resulting in low resistance and smooth movement of the return assembly when it moves forward or backward within the blind hole. Simultaneously, it ensures the coaxiality between the return assembly and the inner wall of the blind hole, guaranteeing the sealing effect of the damping sealing assembly.

[0017] 3. This invention achieves pressure self-tightening sealing of abrasive flow through a damping sealing component. Damping sealing components are provided on the outside of both the connecting sleeve and the return component. The rubber strip expands radially under the pressure of the abrasive flow. The higher the pressure, the tighter the seal. After the material supply stops, the pressure decreases and the seal is automatically released, achieving a double reliable seal at the blind hole port and the blind hole end, effectively preventing leakage of abrasive flow.

[0018] 4. The present invention ensures the smooth flow of the receiving channel under high pressure by using the supporting steel rings inside the gooseneck receiving tube. The several supporting steel rings arranged at equal intervals inside the flexible tube provide sufficient radial compressive strength to resist the radial compression of the gooseneck receiving tube by the high-pressure abrasive flow in the blind hole, and prevent the receiving tube from being flattened and causing blockage of the receiving channel. Attached Figure Description

[0019] Figure 1 This is a cross-sectional view of the grinding mechanism entering the blind hole inside the servo motor casting body in this invention; Figure 2 This is a side elevation view of the connection structure of the grinding mechanism in this invention; Figure 3 This is a schematic diagram of the connection structure of the front part of the grinding mechanism in this invention; Figure 4 This is a schematic diagram of the cross-sectional structure of the front part of the grinding mechanism in this invention; Figure 5 For the present invention Figure 4 A magnified schematic diagram of the node structure at point A in the middle; Figure 6 This is a schematic diagram of the rear connection structure of the grinding mechanism in this invention; Figure 7 This is a schematic cross-sectional view of the rear part of the grinding mechanism in this invention; Figure 8 For the present invention Figure 7 A schematic diagram of the enlarged structure of the node at point B; Figure 9 This is a schematic diagram of the cross-sectional structure of the gooseneck receiving pipe in this invention.

[0020] In the diagram: 1. Servo casting body; 2. Blind hole; 3. Grinding mechanism; 31. Feed pipe; 32. Recovery pipe; 33. Connecting sleeve; 34. Gooseneck receiving pipe; 341. Flexible pipe body; 342. Support steel ring; 35. Return assembly; 351. Head seat; 352. Inflow groove; 36. Moving assembly; 361. Mounting groove; 362. Support arm; 363. Metal spring; 364. Ball groove; 365. Ball; 37. Damping sealing assembly; 371. Limiting ring; 372. Rubber strip; 373. Slip ring; 4. Pulse solenoid valve. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] like Figures 1 to 9 As shown, this embodiment of the invention provides a grinding and polishing device for the inner wall of a servo casting, including a servo casting body 1 and a grinding mechanism 3 that is inserted into a blind hole 2 inside the servo casting body 1.

[0023] Overall structure of the grinding mechanism like Figure 1 and Figure 2 As shown, the grinding mechanism 3 includes a feeding pipe 31, a recovery pipe 32, a connecting sleeve 33, a gooseneck receiving pipe 34, and a return assembly 35 arranged sequentially from front to back. "Front" refers to the direction near the end (bottom) of the blind hole 2, and "back" refers to the direction near the port (opening) of the blind hole 2. The connecting sleeve 33 is inserted into the outer port of the blind hole 2. The feed pipe 31 and the recovery pipe 32 stand side by side, and both the feed pipe 31 and the recovery pipe 32 extend through the connecting sleeve 33 into the blind hole 2. The feed pipe 31 is a rigid pipe (such as a stainless steel pipe), and the recovery pipe 32 is a rigid pipe. The feed pipe 31 and the recovery pipe 32 are fixed side by side by pipe clamps. The rear end of the feed pipe 31 is connected to the abrasive flow supply system for sending the abrasive flow into the blind hole 2 under high pressure. The rear end of the recovery pipe 32 is connected to the abrasive flow recovery system for draining the polished abrasive flow from the blind hole 2. The end (bottom) of the reflux assembly 35 is inserted into the blind hole 2. The gooseneck receiving pipe 34 is located between the recovery pipe 32 and the reflux assembly 35 and is used to transport the abrasive flow collected by the reflux assembly 35 to the recovery pipe 32.

[0024] Pulse solenoid valve and its working principle like Figure 1 and Figure 2 As shown, a pulse solenoid valve 4 is installed on the feed pipe 31. The pulse solenoid valve 4 is electrically connected to an external controller. The controller's pulse signal drives the solenoid valve to open and close periodically at a preset frequency and amplitude, causing the abrasive flow pressure in the feed pipe 31 to pulsate periodically. The pulse frequency of the pulse solenoid valve 4 is 1-10Hz, and the pulse amplitude is ±15% to ±25% of the rated pressure. Within this parameter range, the abrasive flow can generate sufficient dynamic disturbance effect without causing impact damage to the equipment due to excessive pressure fluctuation.

[0025] After the periodic pulsation is transmitted into the blind hole 2, it drives the gooseneck receiving tube 34 to generate periodic radial micro-vibration (breathing effect), so that the annular gap between the outer wall of the gooseneck receiving tube 34 and the inner wall of the blind hole 2 changes dynamically with the pulse period. This dynamic change produces a triple synergistic effect: (1) The periodic change of the annular gap causes the flow state of the abrasive flow to be continuously disturbed, maintaining a turbulent state throughout the blind hole 2; (2) The micro-vibration of the gooseneck receiving tube 34 prevents its outer wall from being in long-term contact with a certain part of the inner wall of the blind hole 2, avoiding local grinding blind areas; (3) The turbulence structure set on the outer wall of the gooseneck receiving tube 34 changes periodically with the abrasive flow during the dynamic change of the gap.

[0026] Reflux component like Figure 3 , Figure 4 and Figure 7 As shown, the reflux assembly 35 includes a head seat 351. The front end of the head seat 351 (the end near the gooseneck receiving pipe 34) is connected to the gooseneck receiving pipe 34. Several inflow grooves 352 are arranged in a ring array on the outer surface of the head seat 351 near the gooseneck receiving pipe 34. After the abrasive flow is blocked by the head seat 351 at the end of the blind hole 2, it enters the head seat 351 through the inflow grooves 352 and is then discharged through the gooseneck receiving pipe 34 and the recovery pipe 32. Both ends of the gooseneck receiving pipe 34 are fixedly connected to the head seat 351 and the recovery pipe 32 via flanges, ensuring the reliability and sealing of the connection.

[0027] Mobile component like Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, a movable component 36 is provided on the outer surface of the end of the return assembly 35 near the damping sealing assembly 37. The movable component 36 includes a plurality of mounting slots 361 arranged in a ring on the outer surface of the rear side of the headstock 351. Each mounting slot 361 has a support arm 362 rotatably mounted therein. Each support arm 362 has a ball groove 364 on the side facing the inner surface of the blind hole 2. Each ball groove 364 has a ball 365 rolled in it. Each mounting slot 361 has a metal spring piece 363 that abuts against the bottom of the inner cavity of the mounting slot 361 and the support arm 362. The ball bearing 365 abuts against the inner wall of the blind hole 2 and rolls along the inner wall of the blind hole 2, so that the return assembly 35 has low resistance and smooth movement when it moves forward or backward in the blind hole 2. The metal spring 363 provides elastic preload, so that the ball bearing 365 always keeps in contact with the inner wall of the blind hole 2, while ensuring the coaxiality between the return assembly 35 and the inner wall of the blind hole 2.

[0028] Damping sealing assembly like Figure 4 , Figure 5 , Figure 7 and Figure 8 As shown, both the connecting sleeve 33 and the return assembly 35 are provided with damping sealing assemblies 37 on their outer sides; The damping sealing assembly 37 includes two limiting rings 371 and two slip rings 373. The two limiting rings 371 are respectively installed on the outer surfaces of the connecting sleeve 33 and the head seat 351, and the two slip rings 373 are respectively slidably installed on the outer surfaces of the connecting sleeve 33 and the head seat 351. A rubber strip 372 is provided between the limiting rings 371 and the slip rings 373, and the first and last sides of the rubber strip 372 are respectively fixed between the limiting rings 371 and the slip rings 373.

[0029] Under the pressure of the abrasive flow, the rubber strip 372 expands radially and fits tightly against the inner wall of the blind hole 2 to achieve a seal. The higher the pressure, the more fully the rubber strip 372 expands and the tighter the seal. After the material supply stops, the pressure decreases, the rubber strip 372 contracts and resets, and the seal is automatically released.

[0030] The front end of the connecting sleeve 33 is provided with a guide cone surface to guide the connecting sleeve 33 into the outer port of the blind hole 2; like Figure 9 As shown, the gooseneck receiving tube 34 includes a flexible tube body 341, and a number of supporting steel rings 342 are equidistantly arranged inside the flexible tube body 341. The supporting steel rings 342 are used to resist the radial pressure of the abrasive flow in the blind hole 2 to keep the receiving channel of the gooseneck receiving tube 34 unobstructed and prevent the receiving tube from being flattened and blocked. The outer wall of the gooseneck receiving tube 34 is provided with a turbulence structure, which is a spiral ridge or an annular turbulence plate, used to generate local turbulence when the abrasive flow flows along the annular gap between the outer wall of the gooseneck receiving tube 34 and the inner wall of the blind hole 2.

[0031] Working principle: Step 1: Insert the front end of the grinding mechanism 3 (i.e., the front end of the feeding pipe 31, the front end of the recovery pipe 32, the connecting sleeve 33 and the return assembly 35) into the blind hole 2 of the servo casting body 1. Under the guidance of the ball 365 of the moving assembly 36, the return assembly 35 moves smoothly along the inner wall of the blind hole 2 to the end of the blind hole 2. The connecting sleeve 33 is inserted into the outer port of the blind hole 2. The damping sealing assembly 37 on the outside of the connecting sleeve 33 forms a preliminary seal with the inner wall of the port of the blind hole 2. The damping sealing assembly 37 on the outside of the return assembly 35 forms a seal with the inner wall of the end of the blind hole 2, thus sealing the end of the blind hole 2. Step 2: Start the abrasive flow supply and pulse. Start the abrasive flow supply system. The high-pressure abrasive flow is sent into the blind hole 2 through the feed pipe 31. At the same time, the pulse solenoid valve 4 is started, so that the pressure of the abrasive flow in the feed pipe 31 will pulsate periodically at a frequency of 1-10Hz and an amplitude of ±15% to ±25%. Step 3: Pulse drive and dynamic turbulence. After the pulse pressure is transmitted to the inside of the blind hole 2, it drives the gooseneck receiving tube 34 to generate periodic radial micro-vibration. This micro-vibration causes the annular gap between the outer wall of the gooseneck receiving tube 34 and the inner wall of the blind hole 2 to change dynamically with the pulse period. The flow state of the abrasive flow is continuously disturbed, and the flow remains turbulent throughout the blind hole 2. At the same time, the micro-vibration of the gooseneck receiving tube 34 prevents its outer wall from sticking to a certain part of the inner wall of the blind hole 2 for a long time, avoiding local grinding blind spots. During the dynamic change of the gap, the interaction intensity between the turbulence structure on the outer wall of the gooseneck receiving tube 34 and the abrasive flow changes periodically, further enhancing the turbulence effect. Step 4: Abrasive flow circulation and polishing. The abrasive flow flows along the inner wall of the blind hole 2 towards the end of the blind hole 2 in a turbulent state. During the flow, the abrasive particles impact the inner wall of the blind hole 2 at random angles in multiple directions, achieving full surface grinding and polishing of the inner wall. After the abrasive flow reaches the end of the blind hole 2, it is blocked by the head seat 351 of the return component 35, enters the head seat 351 through the inflow groove 352, and is then discharged from the blind hole 2 through the gooseneck receiving pipe 34 and the recovery pipe 32. Step 5: Pressure self-tightening seal. During the abrasive flow circulation polishing process, the pressure inside the blind hole 2 gradually increases. The rubber strip 372 of the damping sealing component 37 expands radially under the pressure and fits tightly against the inner wall of the blind hole 2. The higher the pressure, the tighter the seal, ensuring that the abrasive flow will not leak from the port or end of the blind hole 2. Step 6: After polishing is completed, stop the abrasive flow supply system and the pulse solenoid valve 4. The pressure in the blind hole 2 gradually decreases, the rubber strip 372 shrinks and resets, and the seal is released. The operator pulls the polishing mechanism 3 out of the blind hole 2 to complete the operation.

[0032] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0033] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A grinding and polishing device for the inner wall of a servo motor casting, comprising a servo motor casting body (1) and a grinding mechanism (3) inserted into a blind hole (2) inside the servo motor casting body (1), characterized in that: The grinding mechanism (3) includes a feeding pipe (31), a recovery pipe (32), a connecting sleeve (33), a gooseneck receiving pipe (34), and a return assembly (35) arranged sequentially from front to back. The connecting sleeve (33) is inserted into the outer port of the blind hole (2). The feeding pipe (31) and the recovery pipe (32) stand side by side, and both the feeding pipe (31) and the recovery pipe (32) extend through the connecting sleeve (33) into the blind hole (2). The end of the return assembly (35) is inserted into the blind hole (2). The gooseneck receiving pipe (34) is located between the recovery pipe (32) and the return assembly (35). Both the connecting sleeve (33) and the return assembly (35) are provided with damping sealing assemblies (37) on their outer sides, and a moving assembly (36) is provided on the outer surface of the end of the return assembly (35) near the damping sealing assembly (37). A pulse solenoid valve (4) is installed on the feeding pipe (31). The pulse solenoid valve (4) is used to generate periodic pulsations in the abrasive flow pressure in the feeding pipe (31). The periodic pulsations are transmitted to the blind hole (2) and drive the gooseneck receiving pipe (34) to generate radial micro-vibrations, so that the annular gap between the outer wall of the gooseneck receiving pipe (34) and the inner wall of the blind hole (2) changes dynamically with the pulse period.

2. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The reflux assembly (35) includes a headstock (351), the front end of which is connected to the gooseneck receiving pipe (34). A plurality of inflow grooves (352) are arranged in a ring array on the outer surface of the headstock (351) near the gooseneck receiving pipe (34). Abrasive particles flow through the inflow grooves (352) into the headstock (351) and are discharged through the gooseneck receiving pipe (34).

3. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The gooseneck receiving pipe (34) is fixedly connected to the head seat (351) and the recovery pipe (32) at both ends by flanges.

4. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The moving component (36) includes a plurality of mounting slots (361) arranged in a ring array on the outer surface of the rear side of the headstock (351). Each of the mounting slots (361) has a support arm (362) rotatably mounted therein. Each of the support arms (362) has a ball groove (364) on the side facing the inner surface of the blind hole (2). Each of the ball grooves (364) has a ball (365) rollingly mounted therein. Each of the mounting slots (361) has a metal spring (363) that abuts against the bottom of the inner cavity of the mounting slot (361) and the support arm (362). The ball (365) abuts against the inner wall of the blind hole (2) and rolls along the inner wall of the blind hole (2).

5. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The damping sealing assembly (37) includes two limiting rings (371) and two slip rings (373). The two limiting rings (371) are respectively installed on the outer surfaces of the connecting sleeve (33) and the head seat (351). The two slip rings (373) are respectively slidably installed on the outer surfaces of the connecting sleeve (33) and the head seat (351). A rubber strip (372) is provided between the limiting rings (371) and the slip rings (373). The first and last sides of the rubber strip (372) are respectively fixed between the limiting rings (371) and the slip rings (373). The rubber strip (372) expands radially under the action of abrasive flow pressure to enhance the seal.

6. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The front end of the connecting sleeve (33) is provided with a guide cone surface, which is used to guide the connecting sleeve (33) to be inserted into the outer port of the blind hole (2).

7. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The gooseneck receiving pipe (34) includes a flexible pipe body (341), and a plurality of supporting steel rings (342) are provided at equal intervals inside the flexible pipe body (341). The supporting steel rings (342) are used to resist the radial pressure of the abrasive flow in the blind hole (2) to keep the receiving channel of the gooseneck receiving pipe (34) unobstructed.

8. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The feeding pipe (31) is a rigid pipe, the recycling pipe (32) is a rigid pipe, and the feeding pipe (31) and the recycling pipe (32) are fixed side by side by pipe clamps.

9. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The pulse frequency of the pulse solenoid valve (4) is 1-10Hz, and the pulse amplitude is ±15% to ±25% of the rated pressure.

10. The device for grinding and polishing the inner wall of a servo motor casting according to claim 1, characterized in that: The outer wall of the gooseneck receiving pipe (34) is provided with a turbulence structure, which is a spiral ridge or an annular turbulence plate, used to generate local turbulence when the abrasive flow flows along the annular gap between the outer wall of the gooseneck receiving pipe (34) and the inner wall of the blind hole (2).

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