Efficient inner hole polishing and strengthening combined machining method and device

Abstract

The invention discloses an efficient inner hole polishing and strengthening combined machining method and device, and relates to the technical field of polishing and strengthening machining, the device comprises a first support, a base and a second support, and the upper surface of the base is provided with a first piston cylinder and a second piston cylinder through the first support and the second support respectively. According to the three-stage synergistic cavitation enhancement structure constructed by the invention, the flow guide ring bulges disturb mixed liquid and induce cavitation when the flow channel volume is alternated and the pressure is fluctuated; the streamline connection area changes flow velocity and pressure to promote cavitation generation; the grooves and the pits trigger local turbulence to generate extra cavitation bubbles, so that the generation frequency and quantity of cavitation bubbles are remarkably improved, and the strengthening effect is enhanced; in the machining process, when the hole wall is polished by the abrasive particles, the cavitation bubbles collapse and release energy to strengthen the hole wall, two machining tasks are synchronously completed in a single process, a subsequent independent strengthening process is not needed, the machining period is greatly shortened, and the production efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of polishing and strengthening processing technology, specifically a method and apparatus for efficient internal hole polishing and strengthening composite processing. Background Technology

[0002] Currently used internal surface polishing techniques in industry, such as grinding polishing, chemical polishing, and mechanical polishing, all have significant limitations. Grinding polishing has limited operating environments, chemical polishing presents significant environmental challenges, and traditional mechanical polishing is difficult to handle the internal surface processing of micro-cavities or deep holes.

[0003] Cavitation technology has significant advantages in strengthening the inner walls of small holes. Its principle is as follows: when the local pressure inside a liquid is lower than the saturated vapor pressure at that temperature, vaporization and boiling occur inside the liquid or at the solid-liquid interface, forming cavitation bubbles filled with vapor and dissolved gases. These bubbles violently collapse in the high-pressure zone, releasing energy that acts on the inner wall of the hole. When machining the inner walls of small holes using an abrasive-water mixture, the abrasive particles driven by the high-speed water flow can reduce the surface roughness, achieving precision polishing. Simultaneously, the sudden drop in local water pressure induces cavitation. The local high pressure and high temperature generated by the collapse of cavitation bubbles can respectively cause plastic deformation of the material surface and promote changes in the surface microstructure, thereby achieving strengthening. Furthermore, polishing provides a smooth substrate for subsequent strengthening to eliminate stress concentration sources, while cavitation constructs a fatigue-resistant and wear-resistant functional strengthening layer; the two can work synergistically.

[0004] Existing technologies still have shortcomings: Chinese Patent Publication No. CN119550237A, "A Polishing Equipment for the Inner Wall of Aluminum Pipes," can only polish the inner surface of aluminum pipes. If it is necessary to improve the mechanical properties of the pipes, subsequent strengthening processing is required, which is cumbersome and inefficient. Chinese Patent Publication No. CN114589405B, "A Method for Improving the Quality of the Inner Wall of Laser-Processed Microholes Based on the Dual Cavitation Effect," although it strengthens the process through the dual cavitation effect of "laser cavitation-ultrasonic cavitation," the location of cavitation bubbles is uncontrollable, which can easily lead to uneven strengthening effects and cannot meet the requirements of high-precision processing.

[0005] Based on this, a high-efficiency composite processing method and apparatus for internal hole polishing and strengthening is now provided, which can eliminate the drawbacks of existing apparatus. Summary of the Invention

[0006] The purpose of this invention is to provide a high-efficiency composite processing method and apparatus for internal hole polishing and strengthening, so as to solve the problems in the prior art.

[0007] To achieve the above objectives, the present invention provides the following technical solution: A high-efficiency internal hole polishing and strengthening composite processing device includes a support first, a base, and a support second. Piston cylinder first and piston cylinder second are respectively mounted on the upper surface of the base via support first and support second. Clamps are respectively mounted on the opposite side walls of piston cylinder first and piston cylinder second via flange first and flange second. Piston first and piston second are respectively sealed and slidably arranged inside piston cylinder first and piston cylinder second. Both piston cylinder first and piston cylinder second are truncated conical structures. Piston first and piston second are connected to an external electric actuator.

[0008] Based on the above technical solutions, the present invention also provides the following optional technical solutions: In one alternative: a spiral guide ring is provided on the inclined surface of the inner wall of piston cylinder one and piston cylinder two, and a spiral guide ring is also provided on the periphery of piston one and piston two.

[0009] In one alternative: the spiral guide ring surfaces of the inner walls of piston cylinder one and piston cylinder two are provided with a large number of protrusions.

[0010] In one alternative: the clamp is provided with a spiral groove on its periphery, and the spiral groove is provided with continuous recesses.

[0011] In one alternative embodiment, rubber sealing rings are provided on the end faces of piston cylinder one and piston cylinder two near the workpiece to be processed.

[0012] In one alternative: the piston cylinder one, piston one, piston cylinder two, piston two, and the workpiece to be processed together form a closed space, and the closed space is filled with an abrasive-water mixture containing abrasive and air bubbles.

[0013] In one alternative: the helical groove of the clamp connected to the piston cylinder one is right-handed, and the helical groove of the clamp connected to the piston cylinder two is left-handed.

[0014] In one alternative embodiment: a connecting structure is provided between the clamp and piston cylinder one and piston cylinder two, the connecting structure having a large number of regular holes, a water inlet one and a water outlet one are provided on one side of piston cylinder one, and a water inlet two and a water outlet two are provided on one side of piston cylinder two, a valve one, a valve two, a valve four, and a valve three are respectively provided at water inlet one, water outlet one, water inlet two, and water outlet two, and a sealing plug is provided at each of water inlet one, water outlet one, water inlet two, and water outlet two.

[0015] In one alternative: the piston cylinder one and the piston cylinder two are respectively provided with threaded hole one and threaded hole two, the bracket one and the bracket two are both connected to the piston cylinder one and the piston cylinder two by screws, the upper surface of the base is provided with a track, and the bracket one and the bracket two are slidably arranged on the track.

[0016] The efficient internal hole polishing and strengthening composite processing method of the device is characterized by comprising the following steps: S1: Preparation stage: According to the size of the workpiece to be processed, slide bracket one and bracket two along the base track to adjust the distance between the two piston cylinders, fix the workpiece to be processed between the two piston cylinders with the fixture, and ensure that the center hole of the workpiece to be processed is aligned with the conical opening of piston cylinder one and piston cylinder two; open valve one and valve four to inject abrasive water flow mixture into the closed chamber, and close valve one and valve three after filling. S2: Machining Stage: The external electric actuator is activated, controlling piston one and piston two to simultaneously squeeze in opposite directions. The abrasive-water mixture forms a high-speed rotating spiral turbulence under the guidance of the spiral guide ring, polishing the hole wall of the workpiece. At the same time, the abrasive-water mixture induces cavitation and generates bubbles when it flows through the protrusions of the guide ring, the streamlined connection structure, and the grooves and pits of the fixture. The collision of the water flow on both sides at the center of the hole enhances the cavitation effect, and the collapse of the bubbles strengthens the hole wall. Afterwards, the two pistons are controlled to pull back in opposite directions simultaneously, forming a negative pressure to remove waste liquid and debris, while preparing for the generation of new bubbles. S3: End stage: Repeat the reciprocating motion of step S until the predetermined processing time, stop the movement of the two pistons and reset them; open valve one, valve two, valve three and valve four, inject flushing fluid to clean the chamber, drain the waste mixture, close the valves and remove the workpiece.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: This invention constructs a three-stage synergistic cavitation enhancement structure through the piston cylinder guide ring protrusion, the streamlined connection area between the piston cylinder and the fixture, and the fixture groove and pit. The guide ring protrusion disturbs the mixture when the flow channel volume changes and the pressure fluctuates, inducing cavitation; the streamlined connection area changes the flow velocity and pressure, promoting the generation of cavitation bubbles; the groove and pit induce local turbulence, generating additional cavitation bubbles, significantly increasing the frequency and number of cavitation bubbles generated, and enhancing the strengthening effect.

[0018] This invention utilizes spiral guide rings machined on both the inner and outer surfaces of the piston cylinder. These rings work together to guide the mixture into a high-speed rotating spiral flow field, preventing abrasive particles from settling or agglomerating. The spiral grooves of the clamp further maintain the spiral motion of the fluid, ensuring that the abrasive particles are evenly distributed throughout the entire processing area and improving polishing consistency.

[0019] The fixture of this invention fits tightly and with high precision with the inner wall of the workpiece hole, so that the cavitation energy acts on every micro-area of ​​the hole wall without attenuation or dead angle, overcoming the problems of energy attenuation and uneven strengthening in traditional deep hole machining; the multiple sealing structure effectively prevents the leakage of the mixture, ensuring the stability and safety of the machining.

[0020] In the processing of this invention, while the abrasive particles polish the hole wall, the cavitation bubbles collapse and release energy to strengthen the hole wall, thus achieving the simultaneous completion of two processing tasks in a single process. This eliminates the need for a separate subsequent strengthening process, significantly shortens the processing cycle, and improves production efficiency. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the structure of the present invention.

[0022] Figure 2 This is a partial cross-sectional view of the piston cylinder of the present invention.

[0023] Figure 3 This is a schematic diagram of the structure of piston one of the present invention.

[0024] Figure 4 This is a schematic diagram of the fixture structure of the present invention.

[0025] Figure 5 This is a cross-sectional view of the initial state of the surface polishing and strengthening process of the present invention.

[0026] Figure 6 This is a cross-sectional view of the intermediate state of surface polishing and strengthening work according to the present invention.

[0027] Figure 7 This is a schematic diagram of the fixture portion and the contact portion of the hole to be processed during the surface polishing and strengthening operation of the present invention.

[0028] Figure reference numerals: 1 Piston cylinder one, 2 Piston one, 3 Threaded hole one, 4 Inlet one, 5 Outlet one, 6 Support one, 7 Base, 8 Flange one, 9 Workpiece to be processed, 10 Flange two, 11 Piston cylinder two, 12 Piston two, 13 Threaded hole two, 14 Inlet two, 15 Support two, 16 Outlet two, 17 Valve one, 18 Valve two, 19 Valve three, 20 Valve four, 21 Abrasive, 22 Bubble, 23 Abrasive-water mixture, 24 Fixture, 25 Connecting structure, 26 Spiral groove. Detailed Implementation

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0030] In one embodiment, such as Figures 1-7As shown, a high-efficiency internal hole polishing and strengthening composite processing device includes a bracket 6, a base 7, and a bracket 15. Piston cylinder 1 and piston cylinder 2 11 are respectively mounted on the upper surface of the base 7 via bracket 6 and bracket 15. Clamps 24 are respectively mounted on the opposite side walls of piston cylinder 1 and piston cylinder 2 11 via flange 8 and flange 2 10. Piston 12 and piston 2 12 are respectively sealed and slidably disposed inside piston cylinder 1 and piston cylinder 2 11. Both piston cylinder 1 and piston cylinder 2 11 are truncated conical structures. Piston 12 and piston 2 12 are connected to an external electric actuator.

[0031] The external electric actuator is activated, and the piston motion parameters are set. Piston 12 and Piston 2 are controlled to move synchronously towards each other at a speed of 50 mm / s. The pressure of the mixture in the chamber rises to 2 MPa, and a high-speed rotating spiral turbulence is formed under the action of the spiral guide ring. The abrasive 21 is evenly distributed and impacts the inner wall of the workpiece, and polishing begins. When the mixture flows through the protrusion of the guide ring, the local pressure drops below 0.05 MPa, inducing cavitation and generating bubbles 22. When it flows through the streamlined connecting structure 25, the flow velocity increases from 10 m / s to 15 m / s, further generating cavitation. At the recess of the clamp 24, local turbulence greatly increases the number of cavitation. The water flow on both sides collides at the center of the workpiece hole, increasing the turbulence intensity by 30%. The cavitation effect reaches its peak, and the bubbles 22 collapse and release energy, strengthening the hole wall.

[0032] In one embodiment, a spiral guide ring is provided on the inclined surface of the inner wall of piston cylinder 1 and piston cylinder 2 11, and a spiral guide ring is also provided on the periphery of piston 2 and piston 2 12.

[0033] Both the inner and outer surfaces of the piston cylinder are machined with spiral guide rings. The two work together to guide the mixture to form a high-speed rotating spiral flow field, preventing abrasive particles from settling or agglomerating. The helical groove of the fixture further maintains the spiral motion of the fluid, ensuring that the abrasive particles are evenly distributed throughout the entire processing area and improving polishing consistency.

[0034] In one embodiment, the spiral guide ring surfaces of the inner walls of piston cylinder 1 and piston cylinder 2 are provided with a large number of protrusions.

[0035] In one embodiment, the clamp 24 is provided with a spiral groove 26 around its periphery, and the spiral groove 26 is provided with continuous recesses.

[0036] A three-stage synergistic cavitation enhancement structure is constructed using the piston cylinder guide ring protrusion, the streamlined connection area between the piston cylinder and the fixture, and the fixture grooves and pits. The guide ring protrusion disturbs the mixture and induces cavitation when the flow channel volume changes and the pressure fluctuates; the streamlined connection area changes the flow velocity and pressure, promoting cavitation generation; and the grooves and pits induce local turbulence, generating additional cavitation bubbles, significantly increasing the frequency and number of cavitation bubbles and enhancing the enhancement effect.

[0037] In one embodiment, the piston cylinder 1 and piston cylinder 2 are provided with rubber sealing rings on their end faces near the workpiece 9 to be processed.

[0038] The fixture 24 has a rubber ring embedded in its end face, and the workpiece end face has a buffer structure. Together with the sealing layer formed by the liquid itself, multiple seals are achieved to prevent the mixture from leaking out.

[0039] In one embodiment, the piston cylinder 1, piston 2, piston cylinder 11, piston 12, and workpiece 9 together form a closed space, which is filled with an abrasive-water mixture 23 containing abrasive 21 and air bubbles 22.

[0040] In one embodiment, the spiral groove 26 of the clamp 24 connected to the piston cylinder 1 is right-handed, and the spiral groove 26 of the clamp 24 connected to the piston cylinder 21 is left-handed.

[0041] In one embodiment, a connecting structure 25 is provided between the clamp 24 and piston cylinder 1 and piston cylinder 2 11. The connecting structure 25 has a large number of regular holes. Piston cylinder 1 is provided with inlet 4 and outlet 5 around its periphery. Piston cylinder 2 11 is provided with inlet 14 and outlet 16 around its periphery. Valves 17, 18, 20, and 19 are respectively provided at inlet 4, outlet 5, inlet 2 14, and outlet 2 16. Sealing plugs are provided at inlet 4, outlet 5, inlet 2 14, and outlet 2 16.

[0042] In one embodiment, piston cylinder 1 and piston cylinder 2 are respectively provided with threaded hole 3 and threaded hole 13, bracket 6 and bracket 2 are both connected to piston cylinder 1 and piston cylinder 2 by screws, and a track is provided on the upper surface of the base 7, and bracket 6 and bracket 2 are slidably arranged on the track.

[0043] The above embodiments disclose a high-efficiency composite machining method for internal hole polishing and strengthening, the specific working principle and process of which are as follows: Preparation before processing: Based on the material and inner hole size of the workpiece 9 to be processed, prepare the abrasive water flow mixture 23. The abrasive 21 is selected from hard particles that match the material of the workpiece 9 to be processed. Control the concentration of the mixture. Open the valves of inlet 1 4 and inlet 2 14. Inject the mixture into the sealed chamber through the high-pressure injection device. Observe the pressure change in the chamber. When the pressure reaches the preset value and the mixture fills the chamber, close the inlet valve.

[0044] Formal processing: The external electric actuator is activated, the piston motion parameters are set, and pistons 12 and 12 are controlled to move synchronously towards each other at a speed of 50 mm / s. The pressure of the mixture in the chamber rises to 2 MPa, and a high-speed rotating spiral turbulence is formed under the action of the spiral guide ring. The abrasive 21 is evenly distributed and impacts the inner wall of the workpiece, and polishing begins. When the mixture flows through the protrusion of the guide ring, the local pressure drops below 0.05 MPa, inducing cavitation and generating bubbles 22. When flowing through the streamlined connecting structure 25, the flow velocity increases from 10 m / s to 15 m / s, further generating cavitation. At the recess of the fixture 24, local turbulence greatly increases the number of cavitation. The water flow on both sides collides at the center of the workpiece hole, increasing the turbulence intensity by 30%, and the cavitation effect reaches its peak. The bubbles 22 collapse and release energy, strengthening the hole wall.

[0045] Circulation and Cleaning: When the piston reaches its maximum stroke, control piston 12 and piston 212 to synchronously pull back in opposite directions at a speed of 40 mm / s. The chamber volume increases and the pressure drops to 0.1 MPa, creating a negative pressure to discharge waste liquid and debris through outlet 15 and outlet 216. Then, the opposing squeezing and reverse pulling actions are repeated. The piston movement speed and pressure parameters are adjusted once for each cycle to adapt to the processing progress. After processing for 30 minutes, the piston movement is stopped and the piston is reset. The inlet and drain valves are opened to inject clean water to rinse the chamber until the discharged liquid is clear. All valves are closed, fixture 24 is disassembled, and the processed workpiece is removed.

[0046] Overall layout: Two conical piston cylinders are placed horizontally with their central axes collinear; a clamp 24 is set between the two piston cylinders, and the clamp is in close contact with the workpiece to be processed; the interiors of piston cylinder one and piston cylinder two are sealed and slidably connected, forming a closed chamber inside the piston cylinder; a track is provided on the base 7, and a sliding component is installed at the bottom of the bracket and mounted on the track. The bracket is fixedly connected to the piston cylinder shell and can slide along the track to adjust the distance between the two piston cylinders to adapt to the processing of workpieces of different sizes.

[0047] Chamber and flow guiding structure: The inner surfaces of piston cylinder 1 and piston cylinder 2 11, and the outer surfaces of piston 1 2 and piston 2 12 are all machined with spiral flow guiding rings, and the outer surfaces of the flow guiding rings are provided with a large number of protrusions; the outer surface of the clamp 24 at the connection between the piston cylinder and the workpiece is covered with spiral grooves, and the inner surface of the grooves is machined with continuous pits; the connection between the clamp 24 and the piston cylinder is a streamlined structure, and the connection end between the piston cylinder and the workpiece is equipped with a rubber sealing ring, so that the inner surface of the workpiece and the sealed chamber together form a closed space, and the closed space is filled with abrasive water flow mixture 23.

[0048] Fixture design: The surface of fixture 23 connected to piston cylinder 1 is machined with a right-hand spiral groove 26, and the surface of fixture 24 connected to piston cylinder 21 is machined with a left-hand spiral groove 26, guiding the water flow on both sides to collide in the center area of ​​the workpiece hole; the outer contour of the fixture fits tightly with the inner wall of the workpiece 9 with high precision, and the end face of fixture 24 is embedded with a rubber ring, and the end face of the workpiece is provided with a buffer structure, which, together with the sealing layer formed by the liquid itself, achieves multiple seals to prevent the mixture from leaking out; a large number of regularly arranged holes are opened at the interface between the piston cylinder and fixture 24 to facilitate the entry of the abrasive water flow mixture 23 into the groove of fixture 24.

[0049] Piston cylinder details: The conical piston cylinder has a truncated conical structure, and its volume fluctuates periodically with the reciprocating motion of the piston; the cylindrical part of the piston cylinder has an outlet and an inlet, both of which are perpendicular to the piston cylinder axis and collinear with the central axis. Both the inlet and outlet are equipped with sealing plugs; the upper part of the bracket is annular, and the inner radius of the circle is equal to the outer radius of the piston cylinder, so that it can fit tightly with the piston cylinder. The top of the annular shape is clamped and fixed by screws.

[0050] A three-stage synergistic cavitation enhancement structure is constructed using the piston cylinder guide ring protrusion, the streamlined connection area between the piston cylinder and the fixture, and the fixture grooves and pits. The guide ring protrusion disturbs the mixture and induces cavitation when the flow channel volume changes and the pressure fluctuates; the streamlined connection area changes the flow velocity and pressure, promoting cavitation generation; and the grooves and pits induce local turbulence, generating additional cavitation bubbles, significantly increasing the frequency and number of cavitation bubbles and enhancing the enhancement effect.

[0051] Both the inner and outer surfaces of the piston cylinder are machined with spiral guide rings. The two work together to guide the mixture to form a high-speed rotating spiral flow field, preventing abrasive particles from settling or agglomerating. The helical groove of the fixture further maintains the spiral motion of the fluid, ensuring that the abrasive particles are evenly distributed throughout the entire processing area and improving polishing consistency.

[0052] The fixture fits tightly and precisely with the inner wall of the workpiece, ensuring that cavitation energy acts on every micro-area of ​​the hole wall without attenuation or dead angles, overcoming the problems of energy attenuation and uneven strengthening in traditional deep and small hole machining; the multiple sealing structure effectively prevents the leakage of the mixture, ensuring machining stability and safety.

[0053] During the processing, the abrasive particles polish the hole wall while the cavitation bubbles collapse and release energy to strengthen the hole wall. This allows two processing tasks to be completed simultaneously in a single process, eliminating the need for a separate subsequent strengthening process, significantly shortening the processing cycle and improving production efficiency.

[0054] The distance between the two piston cylinders can be adjusted by sliding the bracket along the track, which can accommodate small hole workpieces of different sizes; and the processing is not limited by the length-to-diameter ratio of the small hole. It can efficiently process complex internal holes such as deep holes and micro-cavities, and its application scope covers core components of high-end equipment in multiple fields such as aerospace, hydraulics, and medical.

[0055] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A high-efficiency internal hole polishing and strengthening composite processing device, characterized in that, Includes bracket one (6), base (7), and bracket two (15). Piston cylinder one (1) and piston cylinder two (11) are respectively installed on the upper surface of the base (7) through bracket one (6) and bracket two (15). Clamps (24) are respectively installed on the opposite side walls of piston cylinder one (1) and piston cylinder two (11) through flange one (8) and flange two (10). Piston one (2) and piston two (12) are respectively sealed and slidably arranged inside piston cylinder one (1) and piston cylinder two (11). Piston cylinder one (1) and piston cylinder two (11) are both truncated conical structures. Piston one (2) and piston two (12) are connected to an external electric actuator.

2. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, Spiral guide rings are provided on the inclined surfaces of the inner walls of piston cylinder 1 (1) and piston cylinder 2 (11), and spiral guide rings are also provided on the periphery of piston 1 (2) and piston 2 (12).

3. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, The spiral guide ring surfaces of the inner walls of piston cylinder one (1) and piston cylinder two (11) are provided with a large number of protrusions.

4. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, The clamp (24) is provided with a spiral groove (26) on its periphery, and the spiral groove (26) is provided with continuous pits.

5. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, The piston cylinder one (1) and piston cylinder two (11) are provided with rubber sealing rings on the end face of the workpiece (9) to be processed.

6. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, The piston cylinder 1 (1), piston 1 (2), piston cylinder 2 (11), piston 2 (12), and workpiece to be processed (9) together form a closed space, and the closed space is filled with abrasive water flow mixture (23), which contains abrasive (21) and air bubbles (22).

7. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, The spiral groove (26) of the clamp (24) connected to the piston cylinder one (1) is right-handed, and the spiral groove (26) of the clamp (24) connected to the piston cylinder two (11) is left-handed.

8. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, A connecting structure (25) is provided between the clamp (24) and piston cylinder one (1) and piston cylinder two (11). The connecting structure (25) has a large number of regular holes. Piston cylinder one (1) is provided with water inlet one (4) and water outlet one (5) on its periphery. Piston cylinder two (11) is provided with water inlet two (14) and water outlet two (16) on its periphery. Valves one (17), two (18), four (20), and three (19) are respectively provided at water inlet one (4), water outlet one (5), water inlet two (14), and water outlet two (16). Sealing plugs are provided at water inlet one (4), water outlet one (5), water inlet two (14), and water outlet two (16).

9. The high-efficiency internal hole polishing and strengthening composite processing device according to claim 1, characterized in that, The piston cylinder one (1) and piston cylinder two (11) are respectively provided with threaded hole one (3) and threaded hole two (13). The bracket one (6) and bracket two (15) are connected to the piston cylinder one (1) and piston cylinder two (11) by screws. The upper surface of the base (7) is provided with a track, and the bracket one (6) and bracket two (15) are slidably arranged on the track.

10. A high-efficiency internal hole polishing and strengthening composite processing method based on the device described in any one of claims 1-9, characterized in that, Includes the following steps: S1: Preparation stage: According to the size of the workpiece (9) to be processed, slide the bracket one (6) and bracket two (15) along the base (7) track to adjust the distance between the two piston cylinders, fix the workpiece (9) to be processed between the two piston cylinders through the clamp (24), and ensure that the center hole of the workpiece (9) to be processed is connected with the conical mouth of piston cylinder one (1) and piston cylinder two (11); open valve one (17) and valve four (20) to inject abrasive water flow mixture (23) into the closed chamber, and close valve one (17) and valve three (19) after filling. S2: Processing stage: Start the external electric actuator and control piston one (2) and piston two (12) to squeeze in opposite directions synchronously. The abrasive water flow mixture (23) forms a high-speed rotating spiral turbulence under the guidance of the spiral guide ring. The abrasive particles polish the hole wall of the workpiece (9) to be processed. At the same time, the abrasive water flow mixture (23) induces cavitation and generates bubbles when it flows through the protrusion of the guide ring, the streamlined connection structure (25) and the groove of the fixture (24). The collision of the water flow on both sides at the center of the hole enhances the cavitation effect. The collapse of the bubbles strengthens the hole wall. Then, control the two pistons to pull back in opposite directions synchronously to form a negative pressure to remove waste liquid and debris, while preparing for the generation of new bubbles. S3: End stage: Repeat the reciprocating motion of step S2 until the predetermined processing time, stop the movement of the two pistons and reset them; open valve one (17), valve two (18), valve three (19), and valve four (20), inject flushing fluid to clean the chamber, discharge the waste mixture, close the valves and remove the workpiece.

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