Hydraulic scraping and tumbling precision machining tool based on flow feedback

Abstract

The invention relates to the field of pipeline inner wall precision machining, and discloses a hydraulic scraping and tumbling precision machining cutter based on flow feedback, which comprises a mandrel, a scraping body is fixedly mounted on the outer diameter of one side of the mandrel, a rolling body is fixedly mounted on the outer diameter of the middle part of the mandrel, a hydraulic module is fixedly mounted on the outer diameter of the other side of the mandrel, and the hydraulic module is fixedly mounted on the outer diameter of the other side of the mandrel. A coupling body is fixedly mounted at the outer side end of the hydraulic module, outer cylinders are movably mounted on the upper side and the lower side of the interior of the scraping body through bearing seats correspondingly, middle cylinders are movably mounted in the outer cylinders correspondingly, and inner rods are movably mounted in the middle cylinders correspondingly; and the outer side ends of the inner rods extend to the exterior of the scraping body and are fixedly provided with first retainers, and the outer side ends of the two first retainers are fixedly provided with a coarse scraper and a fine scraper correspondingly. Through flow feedback stable cutting, adjustable scraping amount, stable rolling and scratch-proof design, efficient and high-precision machining of the inner wall of the pipeline is achieved, various requirements are met, and operation is convenient and fast.

Description

Technical Field

[0001] This invention relates to the field of precision machining of pipe inner walls, specifically to a hydraulic scraping and burnishing precision machining tool based on flow feedback. Background Technology

[0002] In fields such as mechanical manufacturing, hydraulic transmission, and aerospace, the precision machining of the inner walls of pipe-like workpieces directly affects the sealing performance, transmission efficiency, and service life of equipment, especially placing stringent requirements on inner wall roughness, dimensional accuracy, and geometric tolerances. These workpieces often require multiple processes, including scraping to remove machining allowances, finishing, and roll forming, to achieve high precision and low roughness of the inner wall, meeting the demands of complex operating conditions such as high pressure and high speed. Currently, precision machining of pipe inner walls has become one of the key processes in the mechanical manufacturing field, and its processing quality and efficiency directly affect the core performance of the final product.

[0003] Traditional pipe inner wall scraping often employs mechanically adjustable scraper blades with manually adjustable extension, relying on operator experience to judge the scraping depth. This results in low adjustment precision and poor consistency, making it difficult to adapt to the processing needs of workpieces with different materials and wall thicknesses. Furthermore, the lack of a real-time feedback mechanism during scraping makes the cutting force susceptible to fluctuations due to factors such as uneven workpiece material and roundness deviations, leading to defects such as over-scraping, under-scraping, or surface scratches. In addition, traditional scrapers retract slowly after processing, and the retraction process can easily cause friction with the workpiece's inner wall, resulting in secondary damage to the processed surface and severely affecting the quality of the finished product.

[0004] Existing roller burnishing technologies mostly employ rigidly connected roller burnishing components, lacking an effective elastic compensation mechanism for the burning force. When the workpiece experiences slight vibration or inner wall roundness deviation, the burning force fluctuates drastically, resulting in poor surface smoothness and uneven roughness after burning. Furthermore, in traditional machining methods, scraping and roller burnishing processes are independent, requiring multiple workpiece clamping and tool changes. This not only increases process changeover time and equipment investment costs but also easily leads to positioning errors due to repeated clamping, reducing machining accuracy. In addition, some integrated machining tools lack precise power control and feedback adjustment functions, failing to dynamically adjust scraping force and roller burnishing force according to machining conditions. This makes it difficult to balance machining efficiency and quality stability, failing to meet the high-efficiency and high-precision requirements of modern manufacturing. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a hydraulic scraping and rolling precision machining tool based on flow feedback, which solves problems such as dispersed machining processes, low precision of scraping amount adjustment, unstable cutting and rolling pressure, and easy secondary scratches on the workpiece in traditional machining, and achieves efficient and high-precision integrated machining.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solution: a hydraulic scraping and rolling precision machining tool based on flow feedback, comprising a mandrel, a scraping body fixedly installed on one outer diameter of the mandrel, a rolling body fixedly installed on the middle outer diameter of the mandrel, a hydraulic module fixedly installed on the other outer diameter of the mandrel, a coupling body fixedly installed on the outer end of the hydraulic module, and a central push rod movably arranged inside the mandrel.

[0007] Preferably, an outer cylinder is movably mounted on both the upper and lower sides of the scraper body via bearing seats. A middle cylinder is movably mounted inside each of the outer cylinders. An inner rod is movably mounted inside each of the middle cylinders. The outer ends of the inner rods extend to the outside of the scraper body and are fixedly mounted with a first retainer. A coarse scraper and a fine scraper are fixedly mounted on the outer ends of the two first retainers, respectively. Several guide blocks are also uniformly fixedly mounted on the outer diameter of the scraper body.

[0008] Preferably, the interior of the rolling body is uniformly provided with a plurality of columnar grooves, and a first piston is movably installed inside each columnar groove. A V-shaped fixing frame is fixedly installed on the outer end of each first piston. A rotating frame is movably installed at both ends of each V-shaped fixing frame. A spring plate is fixedly installed on both sides of the interior of each V-shaped fixing frame, and the ends of the spring plates extend into the interior of the corresponding rotating frame. A pressure roller is fixedly installed on one side of the inner wall of each rotating frame, and the inner ends of the pressure rollers abut against the surface of the corresponding spring plate. A second retainer is movably installed on both the interior and outer sides of each columnar groove. A roller is installed on the outer end of each second retainer. A connecting rod is movably installed on both sides of the inner end of the second retainer, and the ends of the connecting rods are movably installed on the surface of the corresponding rotating frame.

[0009] Preferably, a first wedge-shaped top block is fixedly installed on the outer diameter of the central push rod near the scraper body, and a second wedge-shaped top block is fixedly installed on the outer diameter of the central push rod near the rolling body. The middle outer diameter of the central push rod is connected to the inner wall of the mandrel through a first return spring.

[0010] Preferably, an adjusting plate is movably mounted on the outer end of the scraper body, and the inner end of the adjusting plate extends into the interior of the scraper body through an adjusting shaft and is fixedly mounted with a driving bevel gear. A driven bevel gear is fixedly mounted on the outer diameter of the outer cylinder, and one side of the driven bevel gear is meshed with the inner side of the driving bevel gear. Keyways are provided on both sides of the interior of the outer cylinder, and splines are fixedly mounted on both ends of the middle cylinder, with the outer ends of the splines movably disposed inside the keyways on the corresponding sides.

[0011] Preferably, the inner end of the middle cylinder extends into the interior of the mandrel and is fixedly mounted with a first arc-shaped support block. The outer diameter of the middle cylinder is movably connected to the end of the corresponding outer cylinder through a second return spring. The inner wall of the middle cylinder is provided with an internal thread, and the outer diameter of the inner rod is provided with an external thread, and the outer end of the external thread is engaged with the corresponding internal thread.

[0012] Preferably, the inner end of the first piston extends into the interior of the mandrel and is fixedly mounted with a second arc-shaped support block, and the outer diameter of the V-shaped fixing bracket is connected to the inner wall of the columnar groove by a spring.

[0013] Preferably, the hydraulic module has an internal cylinder, and a second piston is movably mounted inside the cylinder, with one end of the second piston fixedly connected to one end of the central push rod.

[0014] Preferably, an oil inlet pipe is fixedly installed on the top of the oil cylinder, and an oil outlet pipe is fixedly installed on the bottom of the oil cylinder. A one-way valve is fixedly installed on the outer diameter of both the oil inlet pipe and the oil outlet pipe, and a flow sensor is also fixedly installed on the outer diameter of both the oil inlet pipe and the oil outlet pipe.

[0015] This invention provides a hydraulic scraping and burnishing precision machining tool based on flow feedback. It has the following beneficial effects: 1. This invention integrates three core processes: rough scraping, fine scraping, and burnishing. The entire process is completed through a single feed and retraction of the tool, eliminating the need for multiple workpiece clamping or tool changes. This significantly reduces process switching time and clamping errors, ensuring that the positioning references of the rough scraping, fine scraping, and burnishing processes are consistent, and significantly improving the consistency of the workpiece's inner wall processing accuracy. The scraping and burnishing processes are closely connected, and scraping marks are immediately eliminated by burnishing after scraping, avoiding workpiece surface oxidation or secondary damage caused by process intervals, and improving the surface roughness quality of the inner wall. 2. This invention adds an adjustment disc and a bevel gear transmission mechanism. The operator can rotate the adjustment disc with an Allen wrench, which drives the outer cylinder and the middle cylinder to rotate through the active bevel gear and the driven bevel gear. The inner rod is radially extended and retracted by the thread transmission, which can accurately adjust the extension amount of the coarse scraper and the fine scraper, flexibly control the scraping depth, and adapt to workpieces with different machining allowances and different precision requirements. Moreover, the adjustment process does not affect the normal expansion and contraction function of the hydraulic drive. It is convenient to operate and has high adjustment accuracy. 3. The rolling mechanism of this invention adopts an elastic compensation design of spring plate and pressure roller. When the roller contacts the inner wall of the workpiece, the rotating frame bends the spring plate through the pressure roller. The elastic force of the spring plate acts in the opposite direction on the roller to form a stable rolling force. At the same time, the relative sliding between the pressure roller and the surface of the spring plate can compensate for the elastic force fluctuation caused by the change in the degree of bending of the spring plate, ensuring that the rolling force remains uniform and stable. Even if there is slight vibration during the processing, it can avoid the problem of uneven rolling marks and significantly improve the smoothness and surface quality of the inner wall of the workpiece. Attached Figure Description

[0016] Figure 1 This is a perspective view of the present invention; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a schematic diagram of the internal structure of the scraper body in this invention; Figure 4 This is a schematic diagram of the internal structure of the rolling body in this invention; Figure 5 This is a schematic diagram of the V-shaped fixing frame in this invention.

[0017] The components include: 1. Mandrel; 2. Scraper body; 3. Rolling body; 4. Hydraulic module; 5. Coupler body; 6. Central push rod; 7. First wedge-shaped top block; 8. Second wedge-shaped top block; 9. First return spring; 10. Outer cylinder; 11. Middle cylinder; 12. Keyway; 13. Spline; 14. Inner rod; 15. First retainer; 16. Coarse scraper; 17. Fine scraper; 18. First arc-shaped top block; 19. Second return spring; 20. Adjusting disc; 21. Active cone. 21. Gear; 22. Driven bevel gear; 23. Internal thread; 24. External thread; 25. Guide block; 26. Columnar groove; 27. First piston; 28. Second arc-shaped support block; 29. ​​V-shaped fixing bracket; 30. Rotating bracket; 31. Spring plate; 32. Pressure roller; 33. Second retainer; 34. Roller; 35. Connecting rod; 36. Oil cylinder; 37. Second piston; 38. Oil inlet pipe; 39. Oil outlet pipe; 40. Check valve; 41. Flow sensor. Detailed Implementation

[0018] The technical solutions in 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.

[0019] Example: Please refer to the appendix. Figure 1 -Appendix Figure 5 This invention provides a hydraulic scraping and burnishing precision machining tool based on flow feedback, such as... Figure 1As shown, the tool includes a mandrel 1, which serves as the core load-bearing component of the entire tool system. It provides a stable mounting reference for key components such as the scraper body 2, the rolling body 3, and the hydraulic module 4. Its hollow internal structure provides ample space for the movement of the central push rod 6, ensuring precise and coordinated action of all components during operation. The scraper body 2 is fixedly mounted on one side of the mandrel 1's outer diameter. The scraper body 2 is the core execution unit for roughing and finishing scraping processes, integrating a complete scraper expansion, contraction, and adjustment mechanism. It can perform graded scraping of the workpiece's inner wall under hydraulic drive. The rolling body 3 is fixedly mounted on the middle outer diameter of the mandrel 1. The rolling body 3 is used to roll-finish the workpiece's inner wall after the scraping process, ensuring stable rolling pressure through its internal elastic rolling structure. To effectively improve the surface quality of the inner wall of the workpiece, a hydraulic module 4 is fixedly installed on the outer diameter of the other side of the mandrel 1. The hydraulic module 4 is the power source of the entire tool. The reciprocating movement of the central push rod 6 is realized by the introduction and discharge of hydraulic oil, which in turn drives the action switching of the scraper body 2 and the rolling body 3. A coupling body 5 is fixedly installed on the outer end of the hydraulic module 4. The coupling body 5 is used to realize the quick clamping and fixing of the tool with the external feed equipment, ensuring the stability and coaxiality of the axial feed of the tool during the processing. The central push rod 6 is movably set inside the mandrel 1. As a key component for power transmission, the central push rod 6 can move along the axis of the mandrel 1 under the drive of the hydraulic module 4. Through the wedge-shaped top block on its surface, it drives the radial expansion and contraction of the scraper body 2 and the rolling body 3. In this embodiment, the outer cylinder 10 is movably mounted on both the upper and lower sides of the scraper body 2 via bearing seats. The outer cylinder 10 is rotatably connected to the scraper body 2 via bearing seats, providing a basis for subsequently driving the middle cylinder 11 to rotate. Simultaneously, the keyway 12 inside the outer cylinder 10 engages with the spline 13 of the middle cylinder 11 to achieve power transmission and radial limiting. The middle cylinder 11 is movably mounted inside the outer cylinder 10. As an intermediate component connecting the outer cylinder 10 and the inner rod 14, the middle cylinder 11 can rotate under the drive of the outer cylinder 10 and also move radially under the action of the first wedge-shaped top block 7. The internal thread 23 on its inner wall engages with the external thread 24 of the inner rod 14, converting the rotational motion into the radial extension and retraction of the inner rod 14. The inner rod 14 is movably mounted inside the middle cylinder 11, and the inner rod 14 achieves radial displacement through threaded transmission, thereby driving the first retainer 15 and the scraper assembly to move synchronously, achieving… The expansion and retraction of the scraper are both achieved by extending the outer end of the inner rod 14 to the outside of the scraper body 2 and fixing a first retainer 15 thereon. The first retainer 15 is used to fix the coarse scraper 16 and the fine scraper 17, ensuring the structural stability of the scraper during the scraping process and preventing the scraper from deviating due to cutting force. The outer ends of the two first retainers 15 are respectively fixedly installed with the coarse scraper 16 and the fine scraper 17. The coarse scraper 16 first contacts the inner wall of the workpiece to complete the rough scraping of the inner wall of the workpiece, removing most of the machining allowance. The fine scraper 17 follows closely to perform fine scraping, eliminating rough scraping marks and improving the flatness of the inner wall. Several guide blocks 25 are also evenly fixedly installed on the outer diameter of the scraper body 2. The guide blocks 25 contact the inner wall of the workpiece during the tool feed process, playing a guiding and centering role, ensuring the straightness of the tool axial feed, and avoiding the machining error caused by skewing during the scraping process. Furthermore, the interior of the rolling body 3 is uniformly provided with several columnar grooves 26. These grooves provide installation space for the rolling components such as the first piston 27 and the V-shaped fixing bracket 29, while also restricting the movement direction of each component to ensure the accuracy of the rolling action. The first piston 27 is movably installed inside each of the columnar grooves 26. Under the action of the second wedge-shaped top block 8, the first piston 27 moves axially, thereby driving the V-shaped fixing bracket 29 and the rolling components to expand radially. The second arc-shaped top block 28 at its inner end cooperates with the inclined surface of the second wedge-shaped top block 8, converting the axial force into a radial expansion force. V-shaped fixing brackets 29 are fixedly installed on both outer ends. These brackets serve as the load-bearing frame for the rolling assembly, housing the rotating bracket 30 and spring plate 31. Simultaneously, they drive the second retainer 33 to move synchronously via the connecting rod 35. Rotating brackets 30 are movably installed at both ends of the V-shaped fixing bracket 29, allowing them to rotate around the ends of the V-shaped fixing bracket 29. Elastic compensation of the rolling force is achieved through the cooperation of the pressure roller 32 and the spring plate 31. Spring plates 31 are fixedly installed on both inner sides of the V-shaped fixing bracket 29, with the ends of the spring plates 31 extending into the interior of the corresponding rotating bracket 30. The spring plates 31 possess good... The roller 34 has elastic deformation capability, bending under the pressure of the pressure roller 32 and generating a reverse elastic force, providing stable rolling pressure for the roller 34. Pressure rollers 32 are fixedly installed on one side of the inner wall of the rotating frame 30, and the inner ends of the pressure rollers 32 abut against the surface of the corresponding side spring plate 31. When the rotating frame 30 rotates, the pressure rollers 32 slide relative to the surface of the spring plate 31, compensating for elastic force fluctuations caused by changes in the bending degree of the spring plate 31, ensuring that the rolling pressure remains stable. Second retainers 33 are movably installed on both the inner and outer sides of the columnar groove 26. The second retainers 33 are used to fix the roller 34, and simultaneously on the V-shaped fixing frame 29 and... Driven by the connecting rod 35, radial movement is achieved. Rollers 34 are installed on the outer ends of the second retainer 33. The rollers 34 roll and contact the inner wall of the workpiece during the tool retraction process, and roll and smooth the scraped inner wall to eliminate machining marks and reduce surface roughness. Connecting rods 35 are movably installed on both sides of the inner end of the second retainer 33, and the ends of the connecting rods 35 are movably installed on the surface of the corresponding side rotating frame 30. The connecting rods 35 play a role in force transmission, converting the axial movement of the V-shaped fixing frame 29 into the radial movement of the second retainer 33. At the same time, the rotation of the rotating frame 30 is used to realize the elastic adjustment of the rolling assembly. Furthermore, a first wedge-shaped top block 7 is fixedly installed on the outer diameter of the central push rod 6 near the scraper body 2. The inclined surface of the first wedge-shaped top block 7 cooperates with the first arc-shaped support block 18. When the central push rod 6 moves axially, the radial component force generated by the inclined surface forces the middle cylinder 11 to expand outward, thereby driving the scraper assembly to expand outward. A second wedge-shaped top block 8 is fixedly installed on the outer diameter of the central push rod 6 near the rolling body 3. The inclined surface of the second wedge-shaped top block 8 cooperates with the second arc-shaped support block 28. During the reset process of the central push rod 6, the radial component force generated by the inclined surface forces the first piston 27 to move outward, driving the rolling assembly to expand outward. The middle outer diameter of the central push rod 6 is connected to the inner wall of the spindle 1 through the first reset spring 9. After the hydraulic system is depressurized, the first reset spring 9 provides reset elastic force, driving the central push rod 6 to return to reset, thereby realizing the switching of scraper assembly retraction and rolling assembly expansion. Furthermore, an adjusting disc 20 is movably installed on the outer end of the scraper body 2. The adjusting disc 20 is an operating component for adjusting the scraping amount. The operator can rotate the adjusting disc 20 with an Allen wrench, thereby driving the internal transmission mechanism to adjust the scraper extension amount. The inner end of the adjusting disc 20 extends into the interior of the scraper body 2 through an adjusting shaft and is fixedly installed with a driving bevel gear 21. The driving bevel gear 21 rotates under the drive of the adjusting disc 20, transmitting the rotational power to the driven bevel gears 22 on both sides, realizing a vertical conversion of the power direction. Driven bevel gears 22 are fixedly installed on the outer diameter of the outer cylinder 10, and one side of each driven bevel gear 22 meshes with the inner side of the driving bevel gear 21. Wheel 22 receives power from the drive bevel gear 21 and drives the outer cylinder 10 to rotate synchronously, thereby driving the middle cylinder 11 to rotate. Keyways 12 are provided on both sides of the inner side of the outer cylinder 10. The keyways 12 and the splines 13 of the middle cylinder 11 form a sliding fit, which ensures the power transmission between the outer cylinder 10 and the middle cylinder 11 and allows the middle cylinder 11 to move radially. Splines 13 are fixedly installed at both ends of the middle cylinder 11, and the outer ends of the splines 13 are movably set inside the corresponding side keyways 12. The splines 13 are embedded in the keyways 12 to achieve circumferential fixation of the outer cylinder 10 and the middle cylinder 11, ensuring that the outer cylinder 10 can drive the middle cylinder 11 to rotate synchronously when it rotates, while not restricting the radial expansion and contraction of the middle cylinder 11. Furthermore, the inner ends of the middle cylinder 11 extend into the interior of the spindle 1 and are fixedly mounted with first arc-shaped support blocks 18. The arc-shaped surface of the first arc-shaped support block 18 fits against the inclined surface of the first wedge-shaped support block 7. When the first wedge-shaped support block 7 moves, a radial thrust is generated through the inclined surface contact, forcing the middle cylinder 11 to expand outward. The outer diameter of the middle cylinder 11 is movably connected to the end of the corresponding outer cylinder 10 through a second return spring 19. After the hydraulic system is depressurized, the second return spring 19 provides a return force, pulling the middle cylinder 11 inward, thereby causing the scraper to... The components are retracted into the scraper body 2 to avoid scratching the workpiece. The inner wall of the middle cylinder 11 is provided with internal threads 23. The internal threads 23 and the external threads 24 of the inner rod 14 form a threaded pair. The rotational motion of the middle cylinder 11 is converted into the radial linear motion of the inner rod 14 through the threaded transmission. The outer diameter of the inner rod 14 is provided with external threads 24, and the outer end of the external threads 24 is engaged with the corresponding internal threads 23. The engagement between the external threads 24 and the internal threads 23 ensures the accuracy of the radial movement of the inner rod 14 and realizes the precise adjustment of the scraping amount. Furthermore, the inner end of the first piston 27 extends into the interior of the mandrel 1 and is fixedly mounted with a second arc-shaped support block 28. The arc-shaped surface of the second arc-shaped support block 28 is in contact with the inclined surface of the second wedge-shaped support block 8. When the second wedge-shaped support block 8 moves, a radial thrust is generated through the inclined surface contact, forcing the first piston 27 to move outward. The outer diameter of the V-shaped fixing bracket 29 is connected to the inner wall of the columnar groove 26 by a spring. After the rolling process is completed, the spring provides a reset elastic force, pulling the V-shaped fixing bracket 29 and the rolling assembly inward to ensure that the inner wall of the workpiece is not scratched when the tool is withdrawn. Furthermore, the hydraulic module 4 is equipped with a hydraulic cylinder 36, which is a chamber for receiving hydraulic oil and provides space for the movement of the second piston 37. At the same time, it ensures the sealing of the hydraulic system. The second piston 37 is movably installed inside the hydraulic cylinder 36, and one end of the second piston 37 is fixedly connected to one end of the central push rod 6. The second piston 37 moves along the axis of the hydraulic cylinder 36 under the push of the hydraulic oil, thereby driving the central push rod 6 to move synchronously and realize power transmission. Furthermore, an oil inlet pipe 38 is fixedly installed on the top of the cylinder 36. The oil inlet pipe 38 is used to introduce hydraulic oil into the cylinder 36 to provide a power source for the movement of the second piston 37. An oil outlet pipe 39 is fixedly installed on the bottom of the cylinder 36. The oil outlet pipe 39 is used to discharge the hydraulic oil inside the cylinder 36 when the hydraulic system is depressurized, thereby resetting the second piston 37. A one-way valve 40 is fixedly installed on the outer diameter of both the oil inlet pipe 38 and the oil outlet pipe 39. The one-way valve 40 is used to control the flow direction of the hydraulic oil, prevent backflow of the hydraulic oil, and ensure the normal operation of the hydraulic system. A flow sensor 41 is also fixedly installed on the outer diameter of both the oil inlet pipe 38 and the oil outlet pipe 39. The flow sensor 41 monitors the change in the flow rate of the hydraulic oil in real time and feeds it back to the external controller. The controller dynamically adjusts the hydraulic oil supply according to the preset flow-pressure curve to ensure stable cutting force during scraping and improve machining accuracy.

[0020] Working principle: First, the cutting tool is clamped onto the feed device via the coupling body 5, and the pipe workpiece to be processed is clamped onto the clamping device. The main spindle of the clamping device is started to rotate the pipe, and the feed device controls the axial feed of the cutting tool. Then, hydraulic oil is introduced into the cylinder 36 through the oil inlet pipe 38. The hydraulic oil pushes the second piston 37 to move, which in turn moves the central push rod 6 and the first wedge-shaped top block 7. When the first wedge-shaped top block 7 moves, its inclined surface contacts the first arc-shaped top block 18, which forces the two sides of the middle cylinder 11 to expand radially outward. This causes the inner rod 14, the first retainer 15, and the coarse scraper 16 and the fine scraper 17 to expand outward. The coarse scraper 16 and the fine scraper 17 contact the inner wall of the workpiece, realizing the coarse and fine scraping of the inner wall of the workpiece. The flow sensor 41 monitors the hydraulic oil flow in real time and feeds it back to the external controller. The controller makes dynamic adjustments according to the preset flow-pressure curve to ensure stable cutting. After the cutting tool reaches its endpoint, the spindle continues to control the workpiece rotation, the feed direction reverses, and the hydraulic system depressurizes, with hydraulic oil discharged through the outlet pipe 39. The first return spring 9 drives the central push rod 6 to return to its reset position and drives the first wedge-shaped top block 7 to reset. At this time, the second return spring 19 will drive the middle cylinder 11 to retract inward, retracting the coarse scraper 16 and the fine scraper 17 into the scraping body 2 to avoid scratching the workpiece. During the reset process, the central push rod 6 will drive the second wedge-shaped top block 8 to move. After its inclined surface contacts the second arc-shaped top block 28, it will force all the first pistons 27 to move outward. The first pistons 27 drive the second retainer 33 and rollers 34 to expand radially outward through the V-shaped fixing bracket 29. The rollers 34 will press against the inner wall of the workpiece. During the retraction of the cutting tool, the rollers 34 will roll and smooth the hole wall until the cutting tool is completely withdrawn, realizing the coarse scraping, fine scraping, and rolling of the workpiece.

[0021] Before scraping, the operator can rotate the adjustment disc 20 with an Allen wrench. The adjustment disc 20 will drive the drive bevel gear 21 to rotate, which in turn drives the driven bevel gears 22 on both sides to rotate, thereby driving the outer cylinder 10 to rotate. The rotating outer cylinder 10 drives the middle cylinder 11 to rotate through the limiting cooperation of the spline 13 and the keyway 12. When the middle cylinder 11 rotates, it will drive the inner rod 14 to expand or contract radially through the cooperation of the internal thread 23 and the external thread 24, thereby adjusting the expansion amount of the coarse scraper 16 and the fine scraper 17, thus controlling the scraping amount without affecting the normal expansion and contraction of the first wedge-shaped top block 7 on the tool.

[0022] Furthermore, during the rolling process, after the roller 34 contacts the inner wall of the workpiece, it drives the rotating frame 30 to rotate via the connecting rod 35. The rotating frame 30 bends the spring plate 31 through the pressure roller 32. The elastic force generated by the bent spring plate 31 applies a reverse thrust to the roller 34, thereby applying rolling pressure to the inner wall of the workpiece. When the pressure roller 32 bends the spring plate 31, it slides relative to its surface, compensating for the change in elastic force as the degree of bending of the spring plate 31 changes. This ensures that the reverse thrust applied by the spring plate 31 to the roller remains stable, ensuring that the rolling pressure applied by the roller 34 to the inner wall of the workpiece remains stable. This ensures that the rolling effect can be guaranteed even if there is vibration during the rolling process, thus improving the processing quality.

[0023] 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 hydraulic scraping and burnishing precision machining tool based on flow feedback, comprising a mandrel (1), characterized in that, A scraper (2) is fixedly installed on one side of the outer diameter of the mandrel (1), a rolling body (3) is fixedly installed on the middle outer diameter of the mandrel (1), a hydraulic module (4) is fixedly installed on the other side of the outer diameter of the mandrel (1), a coupling body (5) is fixedly installed on the outer end of the hydraulic module (4), and a central push rod (6) is movably arranged inside the mandrel (1). The scraper body (2) has an outer cylinder (10) movably mounted on its upper and lower sides via bearing seats. The outer cylinder (10) has a middle cylinder (11) movably mounted inside. The middle cylinder (11) has an inner rod (14) movably mounted inside. The outer ends of the inner rod (14) extend to the outside of the scraper body (2) and are fixedly mounted with a first retainer (15). The outer ends of the two first retainers (15) are respectively fixedly mounted with a coarse scraper (16) and a fine scraper (17). Several guide blocks (25) are also evenly fixedly mounted on the outer diameter of the scraper body (2). The interior of the rolling body (3) is uniformly provided with a plurality of columnar grooves (26). A first piston (27) is movably installed inside each columnar groove (26). A V-shaped fixing bracket (29) is fixedly installed on the outer end of each first piston (27). A rotating bracket (30) is movably installed on both ends of each V-shaped fixing bracket (29). A spring plate (31) is fixedly installed on both sides of the interior of each V-shaped fixing bracket (29), and the ends of the spring plates (31) extend into the interior of the corresponding rotating bracket (30). A pressure roller (32) is fixedly installed on one side of the inner wall of the rotating frame (30), and the inner end of the pressure roller (32) abuts against the surface of the spring plate (31) on the corresponding side. A second retainer (33) is movably installed on both the inner and outer sides of the columnar groove (26). A roller (34) is installed on the outer end of the second retainer (33). A connecting rod (35) is movably installed on both sides of the inner end of the second retainer (33), and the end of the connecting rod (35) is movably installed on the surface of the rotating frame (30) on the corresponding side.

2. The hydraulic scraping and burnishing precision machining tool based on flow feedback according to claim 1, characterized in that, A first wedge-shaped top block (7) is fixedly installed on the outer diameter of the central push rod (6) near the scraper (2), and a second wedge-shaped top block (8) is fixedly installed on the outer diameter of the central push rod (6) near the rolling body (3). The middle outer diameter of the central push rod (6) is connected to the inner wall of the mandrel (1) through a first return spring (9).

3. The hydraulic scraping and burnishing precision machining tool based on flow feedback according to claim 1, characterized in that, An adjusting plate (20) is movably installed on the outer end of the scraper body (2). The inner end of the adjusting plate (20) extends into the interior of the scraper body (2) through an adjusting shaft and is fixedly installed with a driving bevel gear (21). A driven bevel gear (22) is fixedly installed on the outer diameter of the outer cylinder (10), and one side of the driven bevel gear (22) is meshed with the inner side of the driving bevel gear (21). Keyways (12) are provided on both sides of the interior of the outer cylinder (10). Splines (13) are fixedly installed on both ends of the middle cylinder (11), and the outer ends of the splines (13) are movably arranged inside the corresponding keyways (12).

4. The hydraulic scraping and burnishing precision machining tool based on flow feedback according to claim 1, characterized in that, The inner end of the middle cylinder (11) extends into the interior of the spindle (1) and is fixedly installed with a first arc-shaped top block (18). The outer diameter of the middle cylinder (11) is movably connected to the end of the corresponding outer cylinder (10) through a second return spring (19). The inner wall of the middle cylinder (11) is provided with an internal thread (23). The outer diameter of the inner rod (14) is provided with an external thread (24), and the outer end of the external thread (24) is engaged with the corresponding internal thread (23).

5. The hydraulic scraping and burnishing precision machining tool based on flow feedback according to claim 1, characterized in that, The inner end of the first piston (27) extends into the interior of the spindle (1) and is fixedly mounted with a second arc-shaped top block (28). The outer diameter of the V-shaped fixing bracket (29) is connected to the inner wall of the columnar groove (26) by a spring.

6. The hydraulic scraping and burnishing precision machining tool based on flow feedback according to claim 1, characterized in that, The hydraulic module (4) is equipped with an oil cylinder (36), and a second piston (37) is movably installed inside the oil cylinder (36), with one end of the second piston (37) fixedly connected to one end of the central push rod (6).

7. The hydraulic scraping and burnishing precision machining tool based on flow feedback according to claim 6, characterized in that, An oil inlet pipe (38) is fixedly installed on the top of the oil cylinder (36), and an oil outlet pipe (39) is fixedly installed on the bottom of the oil cylinder (36). A one-way valve (40) is fixedly installed on the outer diameter of both the oil inlet pipe (38) and the oil outlet pipe (39). A flow sensor (41) is also fixedly installed on the outer diameter of both the oil inlet pipe (38) and the oil outlet pipe (39).

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