A thin-walled cylindrical part precision external grinding manual hydraulic clamp

Abstract

The utility model discloses a thin -walled cylinder spare precision excircle grinding manual hydraulic clamp relates to the field of machining. In view of the problem that thin -walled cylinder spare is easy to deform and is difficult to control the clamping force, the clamp includes the base body, and the annular hydraulic cavity is equipped in the base body, and a plurality of radial step holes are equipped in the circumferential direction and the axial direction, and the ball head piston is matched in the hole, the axial step hole is equipped in the base body end, and the sealing top rod is matched in, and the outer end is screwed pressure adjusting top silk. By adjusting top silk changes the hydraulic cavity pressure, and the ball head piston is driven adaptive support workpiece inner chamber. Add O -ring, miniature pressure gauge, miniature spring dish piece and other structures, realize the pressure quantitative control, multiple sealing and flexible buffering. This clamp can reduce the clamping deformation, improve the clamping stability and processing accuracy, and adapt to the thin -walled piece of different deformation state.

Description

Technical Field

[0001] This utility model relates to the field of machining technology, specifically a manual hydraulic clamp for precision external grinding of thin-walled cylindrical parts. Background Technology

[0002] In the machining of mechanical parts, there exists a type of large-diameter, thin-walled cylindrical component. Its outer circumference often features multiple small-level steps with extremely high precision requirements, necessitating grinding to achieve the designed accuracy. The maximum wall thickness of such workpieces is typically less than 10 mm, and in some cases even less than 5 mm, making them typical easily deformable thin-walled parts. During processing, these types of workpieces face two core problems: first, clamping deformation. Due to their thin walls and poor rigidity, traditional clamping methods easily lead to irregular deformation of the workpiece; second, stress deformation. After rough machining, the release of internal stress causes natural deformation, further increasing the processing difficulty. Ordinary tooling fixtures, due to structural limitations, cannot stably fix deformed workpieces, and the clamping force cannot be precisely controlled—too little force can easily cause workpiece displacement during processing, while too much force will exacerbate clamping deformation. Currently, conventional or CNC cylindrical grinding machines, lacking specialized fixtures, either cannot complete the grinding of the entire outer diameter and steps in a single setup, or require multiple setups. Multiple setups can lead to discrepancies in positioning references, making it difficult to guarantee the coaxiality and dimensional accuracy of each step level. Furthermore, conventional centerless cylindrical grinding machines, limited by their machining principles, cannot meet the precision grinding requirements of thin-walled cylindrical parts with multiple steps. Therefore, there is an urgent need for a specialized fixture that can adapt to the workpiece's deformation state and precisely control the clamping force to solve these problems. Utility Model Content To address the technical problems of difficulty in controlling clamping deformation and accurately controlling clamping force during precision external cylindrical grinding of thin-walled cylindrical parts, this utility model provides a manual hydraulic clamping fixture for precision external cylindrical grinding of thin-walled cylindrical parts. Its core design concept utilizes the synergistic effect of hydraulic pressure and the elastic pressure of a micro-spring disc to achieve stable clamping of the workpiece by manually hydraulically tightening the inner hole of the workpiece, thereby effectively reducing accuracy errors during machining. The specific technical solution adopted is as follows: A manual hydraulic jig for precision external grinding of thin-walled cylindrical parts includes a base. Unlike existing technologies, the base has an annular hydraulic cavity for containing hydraulic oil. The circumferential surface of the base has multiple radially stepped holes (larger inside, smaller outside) communicating with the annular hydraulic cavity along the circumferential and axial directions. Each radially stepped hole contains a ball-head piston. The ball-head piston includes a plug body that slides with the larger diameter section of the radially stepped hole, a rod body that slides and seals with the smaller diameter section of the radially stepped hole, and a part protruding from the base body for supporting the thin-walled cylindrical part. The inner cavity of the cylindrical component has a ball head; the base end has an axial stepped hole with a smaller inner diameter and a larger outer diameter communicating with the annular hydraulic cavity, and a threaded hole is opened at the outer end of the axial stepped hole. A pressure adjusting screw is screwed into the threaded hole, and a sealing rod is arranged in the axial stepped hole. The sealing rod includes a rod head that slides and abuts against the pressure adjusting screw in the larger diameter section of the axial stepped hole, and a rod body that slides and seals against the smaller diameter section of the axial stepped hole; by adjusting the depth of the pressure adjusting screw, the pressure in the annular hydraulic cavity is changed, thereby adjusting the pressure of the ball head piston against the thin-walled cylindrical component.

[0003] Furthermore, the radial stepped holes are arranged uniformly or non-uniformly on the circumference of the base body according to the size or shape of the inner hole of the thin-walled workpiece.

[0004] Furthermore, one or more O-rings are provided between the rod body of the ball piston and the small diameter section of the radial stepped hole, and one or more O-rings are provided between the rod body of the sealing top rod and the small diameter section of the axial stepped hole. The O-rings respectively realize the sealing sliding fit between the ball piston and the radial stepped hole, and between the sealing top rod and the axial stepped hole.

[0005] Furthermore, a miniature spring disc is provided inside the radial stepped hole. The miniature spring disc is located between the shoulder of the radial stepped hole and the plug of the ball piston. The miniature spring disc has a ring structure, and its elastic coefficient is adapted to the clamping force requirements of thin-walled workpieces.

[0006] Furthermore, the inner end of the sealing rod is provided with a flexible plug, which forms a sliding sealing fit with the small-diameter section of the axial stepped hole.

[0007] Furthermore, a miniature pressure gauge is installed at the end of the base via a threaded interface, and the detection end of the miniature pressure gauge is directly connected to the annular hydraulic cavity for real-time display of the pressure value inside the annular hydraulic cavity.

[0008] Furthermore, the ball head surface of the ball head piston is provided with a wear-resistant coating, which is a chromium plating layer or a nitride layer.

[0009] Furthermore, the outer end of the pressure regulating set screw is provided with an internal hexagon adjustment hole for adjusting its screw-in depth by means of an internal hexagon wrench.

[0010] Furthermore, the inner wall of the annular hydraulic cavity is provided with a smooth coating, which is a polytetrafluoroethylene coating or a wear-resistant ceramic coating.

[0011] Furthermore, a sealing plug is provided at the other end of the substrate away from the pressure regulating screw. The sealing plug is interference-fitted with the substrate, and an annular sealing groove is provided between the mating surfaces of the two. An O-ring is provided in the annular sealing groove to seal the end opening of the annular hydraulic chamber.

[0012] The beneficial technical effects of this utility model are as follows: 1. Adapt to deformed workpieces and reduce clamping deformation: Through multiple ball-head pistons arranged circumferentially and axially, the contact support can be adaptively made according to the irregular deformation caused by stress release in the inner hole of thin-walled cylindrical parts. This avoids the forced correction of deformed workpieces by traditional rigid clamping, preserves the natural state of the workpiece to the maximum extent, and reduces additional deformation caused by clamping from the root.

[0013] 2. Precise and controllable clamping force: With the help of pressure regulating set screw and micro pressure gauge, the clamping force can be quantified by hydraulic pressure value. Operators can set the optimal pressure according to the characteristics of workpiece wall thickness, material, etc., which avoids processing displacement caused by insufficient force and prevents excessive force from aggravating the deformation of thin-walled parts. It solves the drawback of traditional fixtures that "control force by experience".

[0014] 3. Improve machining accuracy and efficiency: The multi-point adaptive support of the ball piston can ensure the coaxiality of the outer circle and multi-stage steps of the workpiece, realize the completion of all grinding processes in one clamping, avoid the positioning datum deviation of multiple clamping, and significantly improve machining accuracy; at the same time, reduce the number of clamping times and improve machining efficiency.

[0015] 4. Stable and reliable structure with strong adaptability: Through the multiple sealing design of O-rings, flexible plugs and sealing plugs, the sealing performance of the annular hydraulic chamber is ensured, and the pressure transmission is stable; the radial stepped holes can be flexibly arranged uniformly or non-uniformly according to the size or shape of the workpiece's inner hole, adapting to thin-walled cylindrical parts of different specifications and deformation states.

[0016] 5. Synergistic buffering to protect the workpiece: The miniature spring discs work together with the hydraulic pressure to provide elastic buffering during grinding vibrations or pressure fluctuations, avoiding damage to thin-walled parts from rigid impacts, while also enhancing the stability of clamping.

[0017] 6. High durability and easy maintenance: The wear-resistant coating on the surface of the ball piston and the smooth coating on the annular hydraulic chamber improve the wear resistance and corrosion resistance of the components, extending their service life; each component adopts a modular design, which facilitates disassembly and maintenance and reduces the cost of use. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of this utility model.

[0019] Figure 2 for Figure 1 A schematic diagram of the structure after concealing the thin-walled cylindrical component.

[0020] Figure 3 for Figure 1 A sectional view.

[0021] Figure 4 yes Figure 3 A magnified view of a portion of point A in the middle. Detailed Implementation

[0022] In the description of this utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "communication" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0024] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0025] like Figure 1-4 The above describes a manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts, comprising: A manual hydraulic jig for precision external cylindrical grinding of thin-walled cylindrical parts includes a base 1, the base 1 having an annular hydraulic cavity 11 for containing hydraulic oil; 14 radially stepped holes 12 (larger inside, smaller outside) are evenly distributed circumferentially and 11 locally along the axial direction on the circumferential surface of the base 1, communicating with the annular hydraulic cavity 11. Each radially stepped hole 12 is equipped with a ball-head piston 2, the ball-head piston 2 including a plug body that slides and engages with the larger diameter section of the radially stepped hole 12, a rod body that slides and seals with the smaller diameter section of the radially stepped hole 12, and a part protruding outside the base 1 for supporting the thin-walled cylindrical part 100. The inner cavity has a ball head; the base 1 has an axial stepped hole 13 with a smaller inner diameter and a larger outer diameter communicating with the annular hydraulic cavity 11. The outer end of the axial stepped hole 13 has a screw hole 14, and a pressure adjusting screw 3 is screwed into the screw hole 14. A sealing rod 4 is arranged in the axial stepped hole 13. The sealing rod 4 includes a rod head that slides with the large diameter section of the axial stepped hole 13 and abuts against the pressure adjusting screw 3, and a rod body that slides and seals with the small diameter section of the axial stepped hole 13. The pressure in the annular hydraulic cavity 11 is changed by adjusting the depth of the pressure adjusting screw 3, thereby adjusting the pressure of the ball head piston 2 against the thin-walled cylindrical part 100. The contact part between the ball head of the ball head piston 2 and the inner cavity of the thin-walled cylindrical part 100 is a smooth spherical surface to ensure fit with the deformed inner hole; up to 154 ball heads of the ball head piston 2 achieve multi-point uniform support for the inner cavity of the thin-walled cylindrical part 100; the annular hydraulic cavity 11 is pre-filled with hydraulic oil to form a closed pressure transmission medium.

[0026] Working principle This clamp is based on the principle of hydraulic transmission and multi-point adaptive support, and achieves flexible tension clamping of thin-walled cylindrical parts by manually adjusting the hydraulic pressure: Pressure transmission principle: The pressure regulating screw 3 squeezes the hydraulic oil in the annular hydraulic chamber 11 through the sealing screw 4, so that the hydraulic oil transmits the pressure evenly to the plugs of all the ball pistons 2, pushing the ball pistons 2 to extend outward, and their ball heads press against the inner cavity of the thin-walled cylindrical part 100.

[0027] Adaptive support principle: 154 ball-head pistons 2 are distributed along the circumference and axial direction. The ball heads can adaptively adjust their extension according to the irregular deformation (such as local bulges or depressions) caused by stress release in the inner hole of the thin-walled cylindrical part 100, ensuring that each ball head fits in contact with the inner hole surface, realizing "conformal support" and avoiding the forced correction deformation of the workpiece by traditional rigid clamping.

[0028] Pressure controllable principle: The pressure value in the annular hydraulic chamber 11 is monitored in real time by a miniature pressure gauge. The operator can accurately control the clamping force by adjusting the pressure set screw 3 according to the wall thickness, material and deformation degree of the thin-walled cylindrical part 100, so as to balance the contradiction between "anti-displacement" and "anti-deformation".

[0029] Work process Preparation before clamping: Check the sealing performance of the annular hydraulic chamber 11 (ensure no oil leakage by using O-ring 5, flexible plug 7 and sealing plug 9), confirm that the micro pressure gauge is displaying normally and that the ball piston 2 moves flexibly; fit the thin-walled cylindrical part 100 onto the outer circle of the base 1, so that its inner cavity is initially aligned with the ball head of the ball piston 2.

[0030] Pressure Adjustment and Clamping: Use an Allen wrench to screw in the pressure adjusting set screw 3, push the sealing rod 4 into the annular hydraulic chamber 11 to squeeze the hydraulic oil; the hydraulic oil transmits pressure to all ball pistons 2, causing their ball heads to extend outward synchronously and gradually press against the inner cavity of the thin-walled cylindrical part 100; observe the micro pressure gauge, and when the pressure reaches the preset value (set according to the characteristics of the workpiece, such as 0.3-0.5MPa for a 5mm wall thickness workpiece), stop the adjustment and complete the clamping.

[0031] Grinding process: Start the external cylindrical grinding machine to grind the outer circle and multi-stage steps of the thin-walled cylindrical part 100; during the processing, the ball piston 2 uses hydraulic pressure and the elastic buffer of the micro spring disc 6 to counteract the vibration generated by the grinding force, while maintaining stable support for the workpiece and ensuring processing accuracy.

[0032] Unloading the workpiece: After processing, loosen the pressure regulating screw 3 in the reverse direction, the pressure in the annular hydraulic chamber 11 decreases, and the ball piston 2 retracts inward under the restoring force of the micro spring disc 6, disengaging from the inner cavity of the thin-walled cylindrical part 100; remove the workpiece, completing one processing cycle.

[0033] This embodiment achieves "flexible clamping" of thin-walled cylindrical parts through uniform transmission of hydraulic pressure, adaptive support of multi-point ball heads, and quantitative control of pressure. It effectively solves the problems of large clamping deformation, difficult force control, and low accuracy of multiple clamping in traditional clamping. It can complete the precision grinding of the outer circle of thin-walled cylindrical parts with multi-steps in one go, significantly improving the processing accuracy and efficiency.

[0034] In another preferred embodiment, the radial stepped holes 12 are arranged uniformly or non-uniformly on the circumference of the base 1 according to the size or shape of the inner hole of the thin-walled workpiece. This embodiment, by flexibly adopting uniform or non-uniform arrangement of radial stepped holes according to the size or shape of the inner hole of the thin-walled workpiece, can accurately adapt to the inner hole characteristics of workpieces with different specifications and different stress deformation states. For regular inner holes, uniform arrangement is used to achieve symmetrical support, while for irregular inner holes with local deformation, non-uniform arrangement is used to strengthen the support point density in the deformation area, ensuring the fit between the ball piston and the inner hole of the workpiece, and improving the targeting and stability of clamping.

[0035] In another preferred embodiment, one or more O-rings 5 ​​are provided between the rod of the ball piston 2 and the small-diameter section of the radial stepped hole 12, and one or more O-rings 5 ​​are provided between the rod of the sealing top rod 4 and the small-diameter section of the axial stepped hole 13. The O-rings 5 ​​respectively achieve a sealing sliding fit between the ball piston 2 and the radial stepped hole 12, and between the sealing top rod 4 and the axial stepped hole 13. The provision of one or more O-rings between the ball piston rod and the radial stepped hole, and between the sealing top rod and the axial stepped hole, forms a multi-layered dynamic sealing structure. This effectively prevents hydraulic oil leakage in the annular hydraulic chamber, ensuring the stability and continuity of pressure transmission, and reduces friction and wear during the sliding fit of components, extending the service life of the seals and mating surfaces, and ensuring the long-term reliability of the fixture.

[0036] In another preferred embodiment, a miniature spring disc 6 is provided within the radial stepped hole 12. The miniature spring disc 6 is disposed between the shoulder of the radial stepped hole 12 and the plug body of the ball piston 2. The miniature spring disc has a ring structure, and its elastic coefficient is adapted to the clamping force requirements of thin-walled workpieces. The miniature spring disc within the radial stepped hole provides flexible support for the ball piston through the synergistic effect of elastic force and hydraulic pressure. Its elastic coefficient, adapted to the workpiece clamping force requirements, can buffer the rigid impact caused by hydraulic pressure fluctuations and grinding vibrations, avoiding excessive compression of the thin-walled workpiece by the ball piston, which could lead to clamping deformation. At the same time, "soft contact" is achieved during pressure adjustment, balancing the clamping force and the risk of workpiece deformation, thereby enhancing the safety and stability of clamping.

[0037] In another preferred embodiment, the inner end of the sealing rod 4 is provided with a flexible plug 7, which forms a sliding seal with the small-diameter section of the axial stepped hole 13. The flexible plug at the inner end of the sealing rod forms a sliding seal with the small-diameter section of the axial stepped hole. The flexible material can adapt to the slight axial displacement of the sealing rod during pressure adjustment, filling the gap through its own deformation, further enhancing the sealing performance at the axial stepped hole and effectively preventing hydraulic oil leakage from the axial gap. Simultaneously, the flexible contact reduces wear caused by rigid collisions, ensuring the smoothness of the pressure adjustment process and the durability of the seal.

[0038] In another preferred embodiment, a miniature pressure gauge 8 is installed at the end of the base 1 via a threaded interface, and the detection end of the miniature pressure gauge 8 is directly connected to the annular hydraulic cavity 11 for real-time display of the pressure value within the annular hydraulic cavity 11. The miniature pressure gauge, directly connected to the annular hydraulic cavity via a threaded interface, can display the pressure value within the cavity in real-time and accurately, transforming the traditional experience-based "fuzzy clamping" into quantifiable and controllable "precision clamping." Operators can preset the optimal pressure threshold based on parameters such as workpiece wall thickness and material, avoiding workpiece displacement due to insufficient clamping force or clamping deformation caused by excessive force, significantly improving the consistency and accuracy stability of the processing process.

[0039] In another preferred embodiment, the ball head surface of the ball piston 2 is provided with a wear-resistant coating, which is a chromium plating layer or a nitride layer. The chromium plating layer or nitride layer on the surface of the ball head of the ball piston can significantly improve the hardness and wear resistance of the ball head, reduce wear during long-term contact with the inner hole of the workpiece and during support, and extend the service life of the ball piston. At the same time, the high surface smoothness of the coating can reduce the risk of scratching the inner hole of the workpiece and ensure the surface quality of the inner hole of the workpiece, which is especially suitable for processing thin-walled parts and other workpieces that are sensitive to surface damage.

[0040] In another preferred embodiment, the pressure regulating set screw 3 has an internal hexagonal adjustment hole at its outer end for adjusting its screw-in depth using an internal hexagonal wrench. The internal hexagonal adjustment hole at the outer end of the pressure regulating set screw is compatible with an internal hexagonal wrench, making it easier to apply torque compared to ordinary adjustment structures. Furthermore, the wrench and set screw have a high degree of contact during adjustment, enabling precise adjustment of the screw-in depth. This design reduces the difficulty of manually adjusting the pressure, ensures precise control of the pressure in the annular hydraulic chamber, and meets the stringent clamping force requirements of thin-walled parts.

[0041] In another preferred embodiment, the inner wall of the annular hydraulic cavity 11 is provided with a smooth coating, which is a polytetrafluoroethylene (PTFE) coating or a wear-resistant ceramic coating. The PTFE or wear-resistant ceramic coating on the inner wall of the annular hydraulic cavity can significantly reduce the flow resistance of hydraulic oil, reduce energy loss during pressure transmission, and improve the uniformity of pressure distribution within the cavity. Simultaneously, the coating possesses excellent wear resistance and corrosion resistance, which can reduce long-term erosion of the hydraulic oil and wear on the cavity wall caused by impurities, extend the service life of the hydraulic cavity, and reduce the risk of pressure instability caused by cavity wall wear.

[0042] In another preferred embodiment, a sealing plug is provided at the other end of the base 1 away from the pressure regulating set screw 3. The sealing plug is interference-fitted with the base 1, and an annular sealing groove is provided between the mating surfaces of the two. An O-ring 5 is provided in the annular sealing groove to seal the end opening of the annular hydraulic chamber 11. The sealing plug at the other end of the base forms a double sealing structure with the O-ring in the annular sealing groove through the interference fit, which can reliably seal the end opening of the annular hydraulic chamber. The interference fit ensures basic sealing performance, and the O-ring further fills the mating gap, effectively preventing hydraulic oil from leaking from the end and ensuring the pressure stability of the hydraulic system. At the same time, the detachable design of the interference fit facilitates disassembly and assembly during later maintenance, taking into account both sealing performance and maintenance convenience.

[0043] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A manual hydraulic jig for precision external grinding of thin-walled cylindrical parts, comprising a base (1), characterized in that, The base (1) has an annular hydraulic cavity (11) for containing hydraulic oil inside; the circumferential surface of the base (1) has a plurality of radial stepped holes (12) with a larger inner diameter and a smaller outer diameter that communicate with the annular hydraulic cavity (11) along the circumferential and axial directions. Each radial stepped hole (12) is equipped with a ball piston (2). The ball piston (2) includes a plug body that slides with the larger diameter section of the radial stepped hole (12), a rod body that slides with the smaller diameter section of the radial stepped hole (12) in a sealing fit, and a ball head exposed outside the base (1) for supporting the inner cavity of the thin-walled cylindrical part (100); the end of the base (1) is provided with a cavity that communicates with the annular hydraulic cavity (11). 11) A axial stepped hole (13) with a smaller inner diameter and a larger outer diameter is connected. A screw hole (14) is provided at the outer end of the axial stepped hole (13). A pressure adjusting screw (3) is screwed into the screw hole (14). A sealing rod (4) is arranged in the axial stepped hole (13). The sealing rod (4) includes a rod head that slides with the large diameter section of the axial stepped hole (13) and abuts against the pressure adjusting screw (3), and a rod body that slides and seals with the small diameter section of the axial stepped hole (13). The pressure in the annular hydraulic chamber (11) is changed by adjusting the depth of the pressure adjusting screw (3), thereby adjusting the pressure of the ball piston (2) against the thin-walled cylindrical part (100).

2. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The radial stepped holes (12) are arranged uniformly or non-uniformly on the circumference of the base (1) according to the size or shape of the inner hole of the thin-walled workpiece.

3. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, One or more O-rings (5) are provided between the rod body of the ball piston (2) and the small diameter section of the radial stepped hole (12), and one or more O-rings (5) are provided between the rod body of the sealing top rod (4) and the small diameter section of the axial stepped hole (13). The O-rings (5) respectively realize the sealing sliding fit between the ball piston (2) and the radial stepped hole (12), and between the sealing top rod (4) and the axial stepped hole (13).

4. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The radial stepped hole (12) is provided with a miniature spring disc (6), which is located between the shoulder of the radial stepped hole (12) and the plug of the ball piston (2). The miniature spring disc has a ring structure and its elastic coefficient is adapted to the clamping force requirements of thin-walled workpieces.

5. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The inner end of the sealing top rod (4) is provided with a flexible plug (7), and the flexible plug (7) forms a sliding seal fit with the small diameter section of the axial stepped hole (13).

6. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, A miniature pressure gauge (8) is installed at the end of the base (1) via a threaded interface, and the detection end of the miniature pressure gauge (8) is directly connected to the annular hydraulic chamber (11) for real-time display of the pressure value inside the annular hydraulic chamber (11).

7. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The ball head surface of the ball head piston (2) is provided with a wear-resistant coating, which is a chromium plating layer or a nitriding layer.

8. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The outer end of the pressure regulating set screw (3) is provided with an internal hexagon adjustment hole, which is used to adjust its screwing depth by using an internal hexagon wrench.

9. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The inner wall of the annular hydraulic chamber (11) is provided with a smooth coating, which is a polytetrafluoroethylene coating or a wear-resistant ceramic coating.

10. The manual hydraulic fixture for precision external grinding of thin-walled cylindrical parts according to claim 1, characterized in that, The other end of the base (1) away from the pressure regulating screw (3) is provided with a sealing plug. The sealing plug is interference-fitted with the base (1) and an annular sealing groove is provided between the mating surfaces of the two. An O-ring (5) is provided in the annular sealing groove to seal the end opening of the annular hydraulic chamber (11).

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