A hinge-lap compensation machine tool for machining the inner hole of a sewing machine sleeve

Abstract

The present application relates to the field of mechanical processing, in particular to a hinge honing linkage compensation machine tool for sewing machine sleeve inner hole processing, which comprises a machine body, a machine frame, a main shaft, a honing tool and a processing platform, a processing sleeve is arranged on the processing platform, four independent radial honing clamping compensation push rods are arranged on the side wall of the processing sleeve and are uniformly distributed in the circumferential direction, an integrated annular honing compensation hydraulic cylinder honing radial compensation device is matched, a pneumatic gauge measuring head is arranged at the front end of the honing tool, an arc fixed plate with a wear-resistant and anti-skid layer is arranged at the end of the honing clamping compensation push rod, rubber flexible connecting pieces are arranged between adjacent plates, a reset spring piece is arranged in the honing compensation oil cavity, a 1:2 taper guide conical surface is arranged on the upper side of the fixed plate, real-time online detection and dynamic radial alignment compensation during the processing process are realized, the clamping eccentricity and coaxiality deviation are eliminated, the problems of uneven honing allowance and fast tool wear in traditional hinge honing are solved, and the processing precision and surface quality of the sewing machine sleeve inner hole are significantly improved.

Description

Technical Field

[0001] This invention relates to the field of machining, specifically to a honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve. Background Technology

[0002] In the conventional high-precision machining of the inner hole of a sewing machine sleeve, two independent processes, reaming and honing, are usually required. The industry has attempted to use a reaming and honing cutter with an integrated front-end reaming and mid-end honing structure. This allows a single tool to simultaneously complete both reaming and honing processes, eliminating the need for tool changes and workpiece repositioning between processes. However, this integrated honing tool solution still has the following unresolved defects: workpiece clamping and positioning eccentricity exists during machining, and there is a misalignment between the pre-made inner hole and the spindle rotation center. Due to the lack of suitable eccentricity error compensation... The compensation mechanism is that the rigid integrated tool structure cannot achieve radial floating self-alignment. Once the cutting part of the front reamer is affected by the eccentric error, the cutting trajectory will deviate and the coaxiality deviation between the machined inner hole and the spindle rotation center will occur. The middle honing structure will bear the honing allowance with severe uneven circumferential distribution, which will cause the honing strip to wear sharply on one side, the roundness and cylindricity of the workpiece inner hole to exceed the tolerance, and the circumferential machining quality of the inner hole surface to be poor. In severe cases, the honing strip may break, the inner hole surface may be scratched, or even the tool and workpiece may be mechanically jammed. Summary of the Invention

[0003] The purpose of this invention is to provide a honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve, so as to solve the problem of abnormal honing allowance, which leads to mechanical jamming.

[0004] To achieve the above objectives, the present invention provides the following technical solution: A honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve includes a machine body, a frame at the upper end of the machine body, a control platform on the side of the machine body, a spindle on the side of the frame, a honing tool mounted on the spindle, a machining platform on the lower side of the frame corresponding to the spindle, a machining sleeve on the machining platform, and four radial honing clamping compensation push rods on the side wall of the machining sleeve, the honing clamping compensation push rods being evenly distributed at 90° intervals along the circumference. It can extend independently to push the workpiece to move radially. A honing radial compensation device is provided between the honing clamping compensation push rod and the processing sleeve. The honing radial compensation device pushes the honing clamping compensation push rod to perform radial compensation of the workpiece. The honing radial compensation device is electrically connected to the control platform. A pneumatic measuring head is provided inside the honing tool. The processing end of the honing tool is provided with an air outlet of the pneumatic measuring head, and the air outlet sprays gas toward the inner wall of the sleeve. The pneumatic measuring head is electrically connected to the control platform.

[0005] By installing four radial honing clamping and compensation push rods evenly distributed at 90° intervals along the circumference on the side wall of the machining sleeve, each of which can extend independently to push the workpiece radially, a honing radial compensation device electrically connected to the control platform is installed between the honing clamping and compensation push rods and the machining sleeve. This device can push the honing clamping and compensation push rods to perform radial compensation of the workpiece. Simultaneously, a pneumatic measuring probe electrically connected to the control platform is integrated into the honing tool, with its air outlet positioned at the machining end of the honing tool and spraying gas towards the inner wall of the sleeve. This allows the pneumatic measuring probe to detect the coaxiality deviation and eccentricity of the inner hole in real time during the integrated honing process of the sewing machine sleeve's inner hole, transmitting the data to the control platform. The control platform then uses the detection results... Precise control of the honing radial compensation device drives the honing clamping compensation push rod at the corresponding position to move independently, enabling the workpiece to complete real-time dynamic radial self-alignment compensation. This effectively eliminates machining errors caused by workpiece clamping and positioning eccentricity and coaxiality deviation between the pre-made inner hole and the spindle rotation center. It also avoids the mid-section honing structure bearing severely uneven circumferential honing allowance, thereby preventing problems such as rapid wear of the honing strip on one side, out-of-tolerance roundness and cylindricity of the workpiece inner hole, and poor consistency of circumferential machining quality of the inner hole surface. At the same time, it solves the problems of honing strip breakage, inner hole surface scratches, and even mechanical jamming of the tool and workpiece. While eliminating the steps of tool changing and workpiece indexing and reloading between processes and improving machining efficiency, it significantly improves the machining accuracy and stability of the sewing machine sleeve inner hole.

[0006] Optionally, the honing radial compensation device can be an electromagnetic direct-drive structure consisting of an annular electromagnet base, four independent electromagnetic coils, an armature-type honing clamping compensation push rod, and a return spring. The annular electromagnet base is fixedly installed on the outer wall of the machining sleeve, and four independent electromagnetic coils are evenly arranged at 90° circumferentially. The armature-type honing clamping compensation push rod is slidably assembled in the radial through hole of the machining sleeve. The return spring is sleeved on the tail of the actuator shaft, with its two ends abutting against the inner wall of the machining sleeve and the end of the actuator shaft, respectively. The control platform changes the electromagnetic attraction by adjusting the magnitude of the energizing current of the electromagnetic coils, thereby driving the armature-type honing clamping compensation push rod to extend to different lengths. This can also achieve radial position adjustment and eccentricity compensation for the workpiece. However, the electromagnetic driving force of this structure is limited, and it is only suitable for processing small-diameter, lightweight sewing machine sleeves. Long-term energization can easily cause thermal deformation, leading to a decrease in the extension and retraction accuracy of the actuator shaft. After power failure, the return spring fatigue can easily cause incomplete return. Furthermore, it is greatly affected by electromagnetic interference in the workshop, resulting in insufficient compensation stability. Therefore, this solution is not the preferred honing radial compensation device of this invention.

[0007] Preferably, the honing radial compensation device includes an annular integrated honing compensation hydraulic cylinder, which is fixedly installed on the inner wall of the machining sleeve. The annular integrated honing compensation hydraulic cylinder has four separate honing compensation oil chambers, each filled with hydraulic oil. The honing compensation oil chambers are evenly distributed circumferentially at 90° intervals. A compensation push rod mounting port is provided on the side of each honing compensation oil chamber opposite to the workpiece. The mounting ends of the honing clamping compensation push rods extend into the compensation push rod mounting ports. Oil chamber seals are provided at the compensation push rod mounting ports. The extension and retraction length of the honing clamping compensation push rods is changed by pressure changes within the honing compensation oil chambers. A honing compensation hydraulic control system is provided on the outer side of the machining sleeve. Each honing compensation oil chamber is connected to the honing compensation hydraulic control system, which is electrically connected to the control platform.

[0008] By designing the honing radial compensation device as an integral annular honing compensation hydraulic cylinder structure, four independent honing compensation oil chambers filled with hydraulic oil are evenly divided circumferentially at 90° intervals inside the annular integrated honing compensation hydraulic cylinder. A compensation push rod mounting port is opened on the side of each honing compensation oil chamber facing the workpiece, and an oil chamber seal is installed at the compensation push rod mounting port. The mounting end of the honing clamping compensation push rod extends into the corresponding compensation push rod mounting port. Simultaneously, a honing compensation hydraulic control system, connected to each of the four honing compensation oil chambers, is set on the outside of the machining sleeve, and the honing compensation hydraulic control system is electrically connected to the control platform. This design fully utilizes the high rigidity, large driving force, and fast response speed characteristics of hydraulic transmission, enabling each honing clamping compensation push rod to obtain independent and stable power output, and accurately responding to the commands of the control platform. The stepless and precise adjustment of the honing clamping compensation push rod extension length is achieved by adjusting the oil pressure in the corresponding honing compensation oil chamber. The oil chamber seal at the installation port of the compensation push rod can effectively prevent hydraulic oil leakage, ensuring the stability and compensation accuracy of the hydraulic system pressure. The integrated ring honing compensation hydraulic cylinder structure greatly improves the integration and structural compactness of the honing radial compensation device, reduces the overall radial dimension of the machining sleeve, and the independent control mode of the four independent honing compensation oil chambers can achieve precise radial self-alignment compensation of the workpiece in any direction. It can effectively withstand the large cutting force and vibration generated during the reaming process, avoid the workpiece from moving during the compensation process, significantly improve the response speed and compensation accuracy of real-time dynamic compensation, and ensure that the workpiece clamping and positioning eccentricity and the coaxiality deviation between the pre-made inner hole and the spindle rotation center can be quickly and accurately corrected.

[0009] Preferably, the number of air outlets of the pneumatic measuring instrument probe is 2 to 6, the air outlets are evenly distributed along the circumference of the honing tool, and the spray direction of the air outlets is at an angle of 30° to 60° with the radial direction of the tool axis, so as to form a stable air film measurement gap on the inner wall of the sleeve.

[0010] By setting 2 to 6 air outlets on the pneumatic gauge probe and evenly distributing them along the circumference of the honing tool, with the spray direction forming a 30° to 60° angle with the radial direction of the tool axis, and placing the air outlets at the foremost tip of the tool, a sequence structure is formed where the probe enters the inner hole before the honing cutter, allowing for a pre-detection followed by machining. The configuration of 2 to 6 air outlets avoids the omissions caused by incomplete coverage from a single air outlet, such as eccentricity and roundness errors, while also preventing insufficient air pressure and reduced tool structural strength due to too many air outlets. This ensures tool rigidity while achieving simultaneous multi-point circumferential detection of the inner hole. The evenly distributed circumferential design ensures consistent spray pressure in all directions, covering the inner hole's circumference without blind spots, and guaranteeing that the detection data accurately reflects the roundness of the inner hole. The cylindricity and coaxiality deviations are eliminated by the 30°–60° inclined jetting, which forms a continuous and smooth spiral air film. This eliminates the vortex interference of vertical jetting, stabilizes the measurement gap, and isolates impurities such as chips and coolant, preventing air path blockage and data distortion. Most importantly, the front-end arrangement allows the probe to complete initial deviation detection and pre-compensation before the honing cutter contacts the workpiece. This solves the problem of insufficient accuracy in the inner hole inlet section caused by traditional rear-mounted probes from the source. It can also pre-purge impurities in the inner hole, prevent tool wear and workpiece surface scratches, and continuously form a protective barrier during processing to keep the probe clean. This provides reliable data support for real-time dynamic compensation throughout the process and effectively ensures the consistency of machining accuracy along the entire length of the sewing machine sleeve inner hole.

[0011] Preferably, the end of the honing clamping compensation push rod that contacts the workpiece is provided with an arc-shaped fixing plate, and the adjacent arc-shaped fixing plates cooperate to maintain the roundness of the clamping.

[0012] By installing an arc-shaped fixing plate at the end of each radial honing clamping compensation push rod that contacts the workpiece, and ensuring that adjacent arc-shaped fixing plates can cooperate to form a complete circular clamping surface that fits the outer circle of the sewing machine sleeve, the original point or line contact between the honing clamping compensation push rod and the workpiece is transformed into a large-area surface contact. This effectively disperses the clamping stress and avoids the problem of indentations, local depressions, or even plastic deformation on the outer circle surface of the workpiece caused by the end of the honing clamping compensation push rod directly pressing against the workpiece, thus protecting the surface quality of the workpiece's outer circle. At the same time, the complete circular clamping surface formed by the cooperation of adjacent arc-shaped fixing plates can achieve a comprehensive and uniform fit with the cylindrical outer surface of the sewing machine sleeve. This design ensures uniform circumferential force on the workpiece during clamping, preventing workpiece tilting or offset caused by uneven force at a single clamping point. It significantly improves the coaxiality and clamping stability of the initial workpiece clamping. During the radial self-aligning compensation process driven by the honing radial compensation device to the honing clamping compensation push rod, the arc-shaped fixing plate can always maintain surface contact with the outer circle of the workpiece, preventing slippage at the clamping point or workpiece movement. This ensures the accuracy and continuity of the radial compensation action. In addition, the arc-shaped clamping structure greatly enhances the overall rigidity of the clamping system, enabling it to better withstand the cutting forces and vibrations generated during honing and preventing workpiece vibration during processing.

[0013] Preferably, the inner arc surface of the arc fixing plate is provided with a wear-resistant and anti-slip layer, the thickness of the wear-resistant and anti-slip layer is 1mm to 3mm, and the inner arc surface of the wear-resistant and anti-slip layer is provided with anti-slip texture.

[0014] By setting a special wear-resistant and anti-slip layer on the inner arc surface where the arc-shaped fixing plate directly contacts the sewing machine sleeve workpiece, with its thickness precisely controlled between 1mm and 3mm, and further processing the inner arc surface of the wear-resistant and anti-slip layer to form a composite design with anti-slip texture, the wear-resistant and anti-slip layer significantly improves the friction coefficient of the clamping contact surface. This effectively avoids the problem of insufficient friction when metal is in direct metal-to-metal contact, which can cause the workpiece to rotate circumferentially or move axially during honing due to cutting forces and vibrations. This ensures the stability of workpiece clamping and ensures that radial compensation action can be accurately transmitted to the workpiece without displacement deviation. The 1mm to 3mm thickness avoids the disadvantages of a thin anti-slip layer, such as short wear life and frequent replacement after rapid wear failure, while also preventing the increase in clamping gap and overall clamping rigidity caused by an excessively thick anti-slip layer. The system addresses the issues of descent and reduced coaxiality accuracy of workpiece clamping. While maintaining wear resistance and clamping accuracy, it also ensures the compactness of the clamping system. The anti-slip texture on the inner arc surface further increases the contact area and frictional engagement force, dispersing local clamping stress and preventing local indentations or plastic deformation on the outer surface of the workpiece. At the same time, the tiny grooves formed by the texture can accommodate small amounts of chips, oil, and coolant impurities remaining on the workpiece surface, preventing impurities from getting stuck between the clamping surfaces and causing unstable clamping, workpiece skewing, or surface scratches. In addition, the wear-resistant and anti-slip layer can effectively isolate the direct friction between the arc-shaped fixing plate substrate and the workpiece, protecting the surface quality of the workpiece's outer circle and significantly extending the service life of the arc-shaped fixing plate, reducing the daily maintenance cost of the machine tool, and providing a reliable clamping guarantee for the high-precision and stable machining of the inner hole of the sewing machine sleeve.

[0015] Preferably, a flexible rubber connecting piece is provided between the mating sides of adjacent arc-shaped fixing plates, and the flexible connecting piece is mated to the side of the adjacent arc-shaped fixing plate.

[0016] By placing flexible rubber connecting pieces between the mating sides of adjacent arc-shaped fixing plates, and ensuring these pieces are tightly fitted to both sides of the adjacent arc-shaped fixing plates, a continuous flexible sealing barrier is formed between the arc-shaped fixing plates using the sealing properties of rubber. This effectively prevents impurities such as fine metal chips, coolant, and honing particles generated during the honing process from entering the gaps between the arc-shaped fixing plates, avoiding the problem of decreased compensation accuracy caused by impurity accumulation. This significantly improves the operational reliability and service life of the clamping compensation system. The flexibility of the rubber material allows it to adaptively stretch or compress with the independent radial expansion and contraction of the adjacent arc-shaped fixing plates, without causing any interference. The independent compensation movement of each honing clamping compensation push rod ensures the flexibility and accuracy of radial self-alignment compensation in any direction of the workpiece. At the same time, the flexible connecting plate can always maintain the continuity of the clamping surface between adjacent arc fixed plates. Even when the extension length of each arc fixed plate is inconsistent for eccentric compensation, there will be no sharp gaps or steps. This completely avoids the problems of the workpiece's outer surface being scratched by gaps, jamming into gaps leading to clamping misalignment or compensation failure. The flexible connecting plate can also buffer the collision impact generated by the rapid extension and retraction of adjacent arc fixed plates and the vibration transmitted during the processing, reducing machine tool operating noise, reducing wear between components, and further improving the stability and durability of the entire clamping compensation system.

[0017] Preferably, each of the honing compensation oil chambers is provided with a reset spring. One end of the reset spring abuts against the rear wall of the honing compensation oil chamber, and the other end is fixedly installed on the mounting end face of the honing clamping compensation push rod. The reset spring provides a constant retraction preload force for the honing clamping compensation push rod.

[0018] By installing a return spring in each independent honing compensation oil chamber of the annular integrated honing compensation hydraulic cylinder, and having both ends of the return spring abut against the rear wall of the honing compensation oil chamber and the mounting end face of the honing clamping compensation push rod, the return spring provides a constant retraction preload force to the honing clamping compensation push rod. This design solves the problem of incomplete return and slow return speed of the honing clamping compensation push rod caused by residual hydraulic oil pressure and sliding friction between the oil chamber seal and the actuator shaft in traditional hydraulic drive systems without an independent return mechanism. This ensures that the actuator shaft can quickly return to its original position when the hydraulic pressure is released after machining. The reliably automatic retraction ensures smooth and efficient workpiece clamping and disassembly. The constant preload provided by the return spring effectively eliminates transmission gaps between the honing clamping compensation push rod and the hydraulic mating surface, as well as in the hydraulic pipeline system. This significantly improves the response accuracy and repeatability of the hydraulic drive, ensuring the precision and consistency of radial compensation actions. During honing, the elastic preload of the return spring can form a dynamic balance with the driving force of the hydraulic oil, effectively buffering the cutting vibrations and impacts generated during machining, reducing pressure fluctuations in the hydraulic system, and further enhancing the operational stability of the clamping compensation system.

[0019] Preferably, the upper side of each of the arc-shaped fixing plates is provided with a guide cone surface, and the taper of the guide cone surface is 1:2.

[0020] By setting guide cones on the upper side of each arc-shaped fixing plate and controlling the taper of the guide cones to 1:2, a reliable automatic guiding function is provided for the loading and unloading process of sewing machine sleeve workpieces. When the workpiece is placed into the processing sleeve from top to bottom, the inclined surface of the guide cone can guide the workpiece to automatically align with the clamping center, effectively avoiding the problems of workpiece skewing and jamming during clamping. This significantly reduces the difficulty of manual clamping and the requirements for operational precision, and significantly improves the workpiece clamping efficiency. The guide cone can automatically correct the slight initial eccentricity of the workpiece during the workpiece clamping process. As the workpiece contacts the cone and slides downward, the inclined surface will... The workpiece is gradually pushed to the center position, achieving initial pre-centering of the workpiece. This significantly reduces the initial clamping eccentricity of the workpiece, effectively reducing the workload of the subsequent compensation system and improving the accuracy and response speed of radial compensation. In addition, the guide cone surface can also play a buffering and protective role, preventing the lower end face of the workpiece from rigidly colliding with the sharp upper edge of the arc-shaped fixing plate. This not only prevents damage such as bumps and scratches on the end face of the workpiece and protects the surface quality of the workpiece, but also avoids rapid wear of the edge of the arc-shaped fixing plate, extending the service life of the fixture, improving the adaptability and reliability of automated machine tool production, and reducing equipment downtime caused by clamping failures.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. This invention integrates a pneumatic measuring head at the front end of the honing tool, along with four independent radial honing clamping and compensation push rods evenly distributed circumferentially on the side wall of the machining sleeve, and an integral ring-type integrated honing compensation hydraulic cylinder honing radial compensation device. The pneumatic measuring head detects the coaxiality deviation and eccentricity of the inner hole in real time and transmits the data to the control platform. The control platform precisely drives the corresponding honing compensation oil chamber to adjust the oil pressure and drive the actuator shaft to complete real-time dynamic radial self-alignment compensation. This solves the problems of uneven honing allowance distribution, rapid wear of the honing strip on one side, and out-of-tolerance roundness and cylindricity of the inner hole caused by the lack of an eccentricity compensation mechanism in traditional integrated honing and reaming machining. It effectively avoids honing strip breakage, tool jamming, and other faults. While eliminating the tool changing steps between processes and improving machining efficiency, it significantly improves the machining accuracy and process stability of the inner hole of the sewing machine sleeve.

[0022] 2. This invention solves the problems of workpiece deformation, unstable clamping, and impurity accumulation affecting compensation accuracy caused by traditional point-line clamping. It ensures uniform circumferential force on the workpiece, protects the outer surface quality of the workpiece, and improves the operational reliability and service life of the clamping compensation system. By setting an arc-shaped fixing plate at the end of the honing clamping compensation push rod and forming a complete circular clamping surface, combined with a 1mm to 3mm thick wear-resistant and anti-slip layer with anti-slip texture on the inner arc surface, and a flexible rubber connecting piece between adjacent fixing plates, the large-area surface contact disperses clamping stress. The wear-resistant and anti-slip layer increases the friction coefficient to prevent workpiece movement, and the flexible connecting piece forms a sealing barrier to prevent chips and coolant from entering.

[0023] 3. This invention uses a reset spring within the honing compensation oil chamber to provide a constant retraction preload for the honing clamping compensation push rod. This is combined with a guide cone surface with a 1:2 taper on the upper side of the arc-shaped fixing plate, and air outlets evenly distributed around the pneumatic measuring instrument probe at an angle of 30°–60°. The reset spring eliminates transmission gaps and achieves rapid and reliable return. The guide cone surface automatically guides the workpiece to the center for pre-centering. The inclined air outlets form a stable spiral air film measurement gap. This solves the problems of incomplete return, low clamping efficiency, and susceptibility to interference from impurities in traditional hydraulic systems, improving system response accuracy, clamping efficiency, and detection stability. Attached Figure Description

[0024] Figure 1 This is a schematic diagram of the structure of the honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to the present invention. Figure 2 This is a schematic diagram of the structure of the annular integrated honing compensation hydraulic cylinder of the present invention; Figure 3 This is a top view of the machined sleeve; Figure 4 This is a front view of the machined sleeve; Figure 5 for Figure 4 Sectional view of AA; Figure 6 A schematic diagram of the main shaft; Figure 7 for Figure 6 Enlarged view of point B in the middle.

[0025] In the diagram: 1. Machine body; 101. Frame; 102. Control platform; 103. Spindle; 104. Machining platform; 105. Electric push rod; 106. Spindle motor; 2. Honing tool; 201. Pneumatic measuring instrument probe; 202. Air outlet; 203. Reaming section; 204. Honing section; 3. Machining sleeve; 4. Honing clamping compensation push rod; 5. Annular integrated honing compensation hydraulic cylinder; 501. Honing compensation oil chamber; 502. Compensation push rod mounting port; 503. Oil chamber seal; 6. Arc-shaped fixing plate; 601. Wear-resistant and anti-slip layer; 602. Anti-slip texture; 603. Guide cone surface; 7. Flexible connecting piece; 8. Reset spring. Detailed Implementation

[0026] Please see Figures 1 to 7 This invention provides a honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve, the technical solution of which is as follows: A honing and compensation machine tool for machining the inner hole of a sewing machine sleeve includes a machine body 1. A frame 101 is mounted on the upper end of the machine body 1. A control platform 102 is mounted on the side of the machine body 1. An electric push rod 105 is mounted on the upper side of the frame 101. A spindle 103 is mounted on the side of the frame 101. A spindle motor 106 is mounted on the upper end of the spindle 103. A honing tool 2 is mounted on the spindle 103. A honing section 203 is provided at the front end of the honing tool 2. A honing section 204 is provided in the middle section connecting the honing tool 2 to the honing section 203. A machining platform 104 is provided on the lower side of the frame 101 corresponding to the spindle 103. A machining sleeve 3 is mounted on the machining platform 104. Four radial honing clamping compensation push rods 4 are provided on the side wall of the machining sleeve 3, and the honing clamping compensation push rods 4 are spaced 90° apart circumferentially. The honing clamping compensation push rods 4 are evenly distributed and can extend independently to push the workpiece radially. Each end of the honing clamping compensation push rod 4 that contacts the workpiece is equipped with an arc-shaped fixing plate 6. Adjacent arc-shaped fixing plates 6 cooperate to maintain the roundness of the clamping. Each arc-shaped fixing plate 6 has a guide cone surface 603 on its upper side, with a taper of 1:2. The inner arc surface of the arc-shaped fixing plate 6 is provided with a wear-resistant and anti-slip layer 601, 1mm thick, made of polyurethane elastomer. The inner arc surface of the wear-resistant and anti-slip layer 601 has anti-slip textures 602. A flexible rubber connecting piece 7 is provided between the contacting sides of adjacent arc-shaped fixing plates 6, fitting snugly against the sides of the adjacent arc-shaped fixing plates 6. A honing radial compensation device is installed between the honing push rod 4 and the machining sleeve 3. The honing radial compensation device pushes the honing clamping compensation push rod 4 to perform radial compensation of the workpiece. The honing radial compensation device is electrically connected to the control platform 102. The honing radial compensation device includes an annular integrated honing compensation hydraulic cylinder 5, which is fixedly installed on the inner wall of the machining sleeve 3. The cylinder body of the annular integrated honing compensation hydraulic cylinder 5 has four independent hydraulic oil ports, which are respectively connected to four honing compensation oil chambers 501. Each hydraulic oil port is connected to the outlet of a corresponding proportional servo valve through an independent hydraulic pipeline. The inlet of the proportional servo valve is connected to a hydraulic pump station. The annular integrated honing compensation hydraulic cylinder 5 has four separate honing compensation oil chambers 501. Each honing compensation oil cavity 501 is filled with hydraulic oil and is evenly distributed at 90° intervals along the circumference. A compensation push rod mounting port 502 is provided on the side of each honing compensation oil cavity 501 opposite to the workpiece. The mounting ends of the honing clamping compensation push rods 4 extend into the compensation push rod mounting port 502. Each honing compensation oil cavity 501 is equipped with a return spring 8, one end of which abuts against the rear wall of the honing compensation oil cavity 501, and the other end is fixedly mounted to the mounting end face of the honing clamping compensation push rod 4. The return spring 8 provides a constant retraction preload force for the honing clamping compensation push rod 4. An oil cavity seal 503 is provided at the compensation push rod mounting port 502. The extension and retraction length of the honing clamping compensation push rod 4 changes according to the pressure changes within the honing compensation oil cavity 501.A honing compensation hydraulic control system is installed on the outside of the machining sleeve 3. All honing compensation oil chambers 501 are connected to the honing compensation hydraulic control system, which is electrically connected to the control platform 102. The honing compensation hydraulic control system is an integrated 4-way servo hydraulic valve group. Each honing compensation oil chamber is connected to the corresponding output port of the servo hydraulic valve group via an independent hydraulic pipeline. The control platform independently controls the oil pressure of each honing compensation oil chamber by adjusting the opening of the 4 servo valves, thereby achieving independent extension and retraction control of the 4 honing clamping compensation push rods. A pneumatic measuring instrument probe 201 is installed inside the honing tool 2. A pneumatic rotary joint is installed at the upper end of the spindle. The air path of the pneumatic measuring instrument probe 201 is connected to the pneumatic rotary joint through the axial air passage inside the spindle 103. A fixed air source continuously supplies compressed air to the rotating pneumatic measuring instrument probe through the pneumatic rotary joint, achieving continuous air path connection during tool rotation. The machining end of the honing tool 2 is equipped with... The pneumatic measuring instrument probe 201 has an air outlet 202. A through-hole is axially formed at the center of the honing tool 2. The pneumatic measuring instrument probe 201 is fixedly installed in this hole via a threaded connection. The front end face of the pneumatic measuring instrument probe 201 protrudes 5mm from the front end face of the reaming section 203 of the honing tool 2. Gas is ejected from the air outlets 202 towards the inner wall of the sleeve. The pneumatic measuring instrument probe 201 has six air outlets 202. The air outlets 202 are evenly distributed around the honing tool 2 circumferentially, and the jet direction of each outlet 202 forms a 60° angle with the radial direction of the tool axis to form a stable air film measurement gap on the inner wall of the sleeve. The pneumatic gauge probe 201 is electrically connected to the control platform 102. The pneumatic gauge probe 201 is connected to the pneumatic-electric converter via an air path. The pneumatic-electric converter converts the air pressure signal detected by the probe into a standardized electrical signal, which is then transmitted to the analog input module of the control platform 102.

[0027] Working principle: (Reference) Figures 1 to 7When performing integrated honing of the inner hole of a sewing machine sleeve, the sewing machine sleeve workpiece to be processed is placed from top to bottom into the processing sleeve 3 on the processing platform 104. The guide cone surface 603 with a taper of 1:2 on the upper side of the arc fixing plate 6 guides the workpiece to automatically align with the clamping center, corrects the slight initial eccentricity of the workpiece and completes the preliminary pre-centering. After the workpiece smoothly slides into the clamping area, the control platform 102 sends a command to the honing compensation hydraulic control system, driving the independent honing compensation oil chambers 501 in the annular integrated honing compensation hydraulic cylinder 5, which correspond one-to-one with the four radial honing clamping compensation push rods 4, to be pressurized synchronously. The hydraulic oil pushes the honing clamping compensation push rod 4 out through the compensation push rod mounting port 502, causing the arc fixing plate 6 at the end to move towards the center. The adjacent arc fixing plates 6 are equipped with The workpiece is clamped by a complete circular clamping surface. The wear-resistant and anti-slip layer 601 with a thickness of 1mm on the inner arc surface of the arc fixing plate 6 increases the frictional clamping force through the anti-slip texture 602 on the surface, preventing the workpiece from moving. The rubber flexible connecting piece 7 between adjacent arc fixing plates 6 adapts to the expansion and contraction of the fixing plate, forming a continuous sealing barrier to block the entry of chips and impurities. The four honing clamping compensation push rods 4, which are evenly distributed along the circumference of 90° on the side wall of the processing sleeve 3, move independently to complete the initial clamping and positioning of the workpiece. Then, the spindle motor 106 on the frame 101 drives the spindle 103 to rotate the honing tool 2. The electric push rod 105 starts to feed the spindle 103 downward. The pneumatic measuring head 201 integrated at the front end of the honing tool 2 precedes the reaming section 203 and the honing section 20. 4. Upon entering the inner hole of the workpiece, the pneumatic measuring instrument probe 201, with its six circumferentially evenly distributed air outlets 202, injects compressed gas at a 60° radial angle to the tool axis, forming a stable spiral air film measurement gap between the probe and the inner hole wall. Simultaneously, the high-speed airflow pre-blows away residual iron filings, oil stains, and impurities in the inner hole. The pneumatic measuring instrument probe 201 detects in real time the initial dimensional deviation of the inner hole, the clamping and positioning eccentricity, and the coaxiality deviation between the inner hole axis and the rotation center of the spindle 103. The detection data is transmitted to the control platform 102 with a millisecond-level response speed. After processing and analyzing the detection data, the control platform 102 precisely controls the oil pressure of the corresponding honing compensation oil chamber 501, driving the honing clamping compensation push rod 4 at the corresponding position to extend or retract individually, thus completing the honing process. After initial radial self-alignment compensation to eliminate various initial deviations, the reaming section 203 of the honing tool 2 contacts the inner hole of the workpiece to begin rough reaming. The subsequent honing section 204 then performs finish honing simultaneously. During the machining process, the pneumatic measuring head 201 continuously monitors the roundness, cylindricity, and coaxiality changes of the inner hole in real time. The control platform 102 dynamically adjusts the pressure of each honing compensation oil chamber 501 based on the real-time monitoring data, driving the honing clamping compensation push rod 4 to perform uninterrupted dynamic radial compensation. The reset spring 8 within the honing compensation oil chamber 501 provides a constant retraction preload to the honing clamping compensation push rod 4, eliminating transmission backlash and buffering machining vibrations, ensuring the accuracy and stability of the compensation action, and preventing the honing section 204 from bearing unevenly distributed honing allowance in the circumferential direction.After machining, the spindle 103 drives the honing tool 2 to retract upwards to its initial position. The control platform 102 controls the honing compensation hydraulic control system to release pressure, and the reset spring 8 pushes the honing clamping compensation push rod 4 to quickly and automatically retract, simultaneously releasing the workpiece from the arc-shaped fixing plate 6. The operator or automated robot can then remove the machined sewing machine sleeve. The entire structure sequentially completes automatic workpiece guidance and clamping, initial deviation detection and pre-compensation, synchronous honing, real-time dynamic self-aligning compensation, and workpiece unloading. The coordinated operation of each component effectively eliminates machining errors caused by workpiece clamping eccentricity and coaxiality deviation, avoids one-sided wear and breakage of the honing strip, and prevents tool jamming, significantly improving the machining accuracy, surface quality consistency, and batch production efficiency of the sewing machine sleeve's inner hole.

[0028] The specific embodiment of the present invention has been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the embodiments described above. For those skilled in the art, various changes, modifications, substitutions, and variations made to these embodiments without departing from the principles and ideas of the present invention should still fall within the protection scope of the present invention.

Claims

1. A honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve, comprising a machine body (1), a frame (101) provided at the upper end of the machine body (1), a control platform (102) provided on the side of the machine body (1), a spindle (103) provided on the side of the frame (101), a honing tool (2) mounted on the spindle (103), a machining platform (104) provided on the lower side of the frame (101) corresponding to the spindle (103), and a machining sleeve (3) provided on the machining platform (104), characterized in that, The side wall of the machining sleeve (3) is provided with four radial honing clamping compensation push rods (4), which are evenly distributed at 90° intervals along the circumference. Each honing clamping compensation push rod (4) can extend independently to push the workpiece radially. A honing radial compensation device is provided between the honing clamping compensation push rod (4) and the machining sleeve (3). The honing radial compensation device pushes the honing clamping compensation push rod (4) to perform honing. Radial compensation of the workpiece, the honing radial compensation device is electrically connected to the control platform (102), the honing tool (2) is provided with a pneumatic measuring head (201), the processing end of the honing tool (2) is provided with an air outlet (202) of the pneumatic measuring head (201), and the air outlet (202) sprays gas toward the inner wall of the sleeve. The pneumatic measuring head (201) is electrically connected to the control platform (102). The honing radial compensation device includes an annular integrated honing compensation hydraulic cylinder (5), which is fixedly installed on the inner wall of the machining sleeve (3). The annular integrated honing compensation hydraulic cylinder (5) has four separate honing compensation oil chambers (501), each filled with hydraulic oil. The honing compensation oil chambers (501) are evenly distributed at 90° intervals along the circumference, and a compensation push rod mounting port (50) is provided on the side of the honing compensation oil chamber (501) opposite to the workpiece. 2) The honing clamping compensation push rod (4) is installed with its end extending into the compensation push rod mounting port (502). The compensation push rod mounting port (502) is provided with an oil chamber seal (503). The honing clamping compensation push rod (4) changes its extension length by the pressure change in the honing compensation oil chamber (501). The outside of the processing sleeve (3) is provided with a honing compensation hydraulic control system. The honing compensation oil chamber (501) is connected to the honing compensation hydraulic control system. The honing compensation hydraulic control system is electrically connected to the control platform (102).

2. The honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to claim 1, characterized in that, The number of air outlets (202) of the pneumatic measuring instrument probe (201) is 2 to 6. The air outlets (202) are evenly distributed around the honing tool (2), and the spray direction of the air outlets (202) is at an angle of 30° to 60° with the radial direction of the tool axis, so as to form a stable air film measurement gap on the inner wall of the sleeve.

3. The honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to claim 1, characterized in that, The honing clamping compensation push rod (4) is provided with an arc fixing plate (6) at the end that contacts the workpiece, and the adjacent arc fixing plates (6) cooperate to maintain the roundness of the clamping.

4. A honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to claim 3, characterized in that, The inner arc surface of the arc fixing plate (6) is provided with a wear-resistant and anti-slip layer (601), the thickness of the wear-resistant and anti-slip layer (601) is 1mm to 3mm, and the inner arc surface of the wear-resistant and anti-slip layer (601) is provided with anti-slip texture (602).

5. A honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to claim 3, characterized in that, A flexible rubber connecting piece (7) is provided between the mating sides of the adjacent arc fixing plates (6), and the flexible connecting piece (7) is mated with the side of the adjacent arc fixing plates (6).

6. A honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to claim 1, characterized in that, Each honing compensation oil cavity (501) is provided with a reset spring (8). One end of the reset spring (8) abuts against the rear wall of the honing compensation oil cavity (501), and the other end is fixedly installed on the mounting end face of the honing clamping compensation push rod (4). The reset spring (8) provides a constant retraction preload force for the honing clamping compensation push rod (4).

7. A honing linkage compensation machine tool for machining the inner hole of a sewing machine sleeve according to claim 3, characterized in that, Each of the arc-shaped fixing plates (6) is provided with a guide cone surface (603) on its upper side, and the taper of the guide cone surface (603) is 1:2.

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