Thin-wall workpiece honing hydraulic clamping tool

Abstract

The invention relates to a honing clamping tool, in particular to a thin-wall workpiece honing hydraulic clamping tool which comprises a plastic framework, a lower flange ring, an upper flange ring and a hydraulic ring. The plastic framework comprises a middle cylinder part, an upper flange and a lower flange; the lower flange ring is located at the lower end of the plastic framework. The upper flange ring is located at the upper end of the plastic framework. The hydraulic ring sleeves the outer side of the middle column cylinder part; an oil bin is arranged in the hydraulic ring, an oil groove is formed in the inner side wall of the hydraulic ring and comprises an annular oil groove and an axial oil groove communicated with the annular oil groove, the oil groove is communicated with the oil bin through an oil guide hole, and the hydraulic ring pushes the middle cylinder part in the corresponding area of the oil groove to expand radially through oil pressure in the oil groove; a hydraulic oil filling hole is formed in the upper flange ring and sequentially penetrates through the upper flange ring, the upper flange and the hydraulic ring to be communicated with the oil bin. The fixture has the beneficial effects that the fixture is rigid and flexible, so that uniform clamping force on a thin-wall workpiece is ensured, deformation is avoided, stable rigid support is provided, and the stability and the precision in the machining process are ensured.

Description

Technical Field

[0001] This invention relates to the field of honing clamping fixtures, and in particular to a hydraulic clamping fixture for honing thin-walled workpieces. Background Technology

[0002] In the existing technology, when honing thin-walled workpieces, if conventional rigid clamping is used, it is very easy to cause workpiece deformation, affecting the machining accuracy or even causing the workpiece to be scrapped.

[0003] Chinese patent document 201220097514.X discloses a dry thin-walled cylinder liner inner hole honing air-clamping tool, which uses a pneumatic method to directly clamp the workpiece by radial contraction of the rubber sleeve.

[0004] The drawback of this tooling is that the clamping force is entirely determined by the elasticity and strength of the rubber. For high-precision honing applications, the rigidity and creep resistance of the rubber are insufficient, causing the workpiece to move slightly during processing, affecting the form and position tolerances.

[0005] Chinese patent document CN201110406549.7 discloses a thin-walled honing fixture. The fixture uses hydraulic means to cause the rubber sleeve to contract and hug a rigid sleeve in the middle, and then the rigid sleeve tightens and clamps the thin-walled workpiece.

[0006] The disadvantage of this fixture is that even though it can solve the problem of the flared opening near the top of the inner circle of the workpiece, the tightening of the rigid sleeve is unstable and it has the disadvantage of losing roundness during tightening.

[0007] To clamp the workpiece, a rigid sleeve must undergo elastic deformation. To allow this elastic deformation, the sleeve needs elastic grooves or gaps. This results in uneven tightening of the sleeve; the deformation at the grooved and non-grooved areas is not uniform, but rather an approximate circle with tiny "flat spots" or "irregularities." This is known as "out-of-roundness," and the elastic deformation of the rigid sleeve is also unstable, meaning the degree of "out-of-roundness" is uncertain. This out-of-roundness can be replicated on the clamped thin-walled workpiece. Therefore, this fixture can only be used for thin-walled workpieces with a relatively large thickness and a certain mechanical strength, such as the cylinder liner mentioned in this literature, whose thickness is generally 2-8 mm.

[0008] When dealing with ultra-thin-walled workpieces with a thickness of only 1-2 mm and high honing accuracy requirements for roundness and precision, existing tooling cannot meet the processing needs and is prone to causing workpiece roundness deviations due to clamping deformation. For example, the roundness of the thin-walled workpiece is required to be no more than 0.05 mm and the straightness no more than 0.01 mm. Summary of the Invention

[0009] The technical problem to be solved by the present invention is that existing honing clamping fixtures for thin-walled workpieces are prone to out-of-roundness during the clamping process, which affects the machining accuracy of ultra-thin-walled workpieces.

[0010] The technical solution adopted by the present invention to solve its technical problem is: a hydraulic clamping fixture for honing thin-walled workpieces, comprising a plastic frame, a lower flange ring, an upper flange ring and a hydraulic ring;

[0011] The plastic skeleton has an I-shaped hollow structure. The plastic skeleton includes a central cylindrical section, an upper flange at the upper end of the central cylindrical section, and a lower flange at the lower end of the central cylindrical section. The central cylindrical section of the plastic skeleton is used to clamp thin-walled workpieces.

[0012] The lower flange ring is located at the lower end of the plastic frame, and the upper flange ring is located at the upper end of the plastic frame.

[0013] The hydraulic ring is fitted on the outside of the middle column of the plastic frame. The upper flange of the plastic frame is clamped between the hydraulic ring and the upper flange ring, and the lower flange of the plastic frame is clamped between the hydraulic ring and the lower flange ring.

[0014] The hydraulic ring has an oil reservoir surrounding it, and an oil groove on its inner wall. The oil groove includes multiple annular oil grooves and multiple axial oil grooves connecting the annular oil grooves. The annular oil grooves are equidistant from each other along the axial direction. The oil grooves are connected to the oil reservoir through oil guide holes. The hydraulic ring is driven to expand radially in the middle cylindrical part of the corresponding area of ​​the oil groove by the oil pressure in the oil groove.

[0015] The upper flange ring has a hydraulic oil injection hole, which passes through the upper flange ring, the upper flange of the plastic skeleton and the hydraulic ring in sequence and connects to the oil tank.

[0016] Alternatively, the hydraulic ring has a hydraulic oil injection hole, which passes through the hydraulic ring and connects to the oil reservoir.

[0017] Alternatively, the lower flange ring has a hydraulic oil injection hole, which passes through the lower flange ring, the lower flange of the plastic skeleton, and the hydraulic ring in sequence and connects to the oil tank.

[0018] In some embodiments, optionally, the axial oil grooves are parallel to each other and all penetrate all the annular oil grooves, and the axial oil grooves are evenly arranged circumferentially along the inner sidewall of the hydraulic ring.

[0019] In some embodiments, optionally, the hydraulic ring is a split structure, consisting of at least two hydraulic rings joined together to form a whole, with a sealing structure between the joints of the hydraulic ring splits, and an annular oil groove connected or disconnected at the joints of the hydraulic ring splits.

[0020] In some embodiments, the hydraulic ring may optionally consist of two parts, which are semi-circular in shape.

[0021] In some embodiments, optionally, the hydraulic ring split includes a hydraulic ring split body with a U-shaped cross section, an upper cover and an end cover. The upper cover is sealed to the top opening of the hydraulic ring split body and is used to form an oil reservoir in the inner cavity of the hydraulic ring split body. The end cover is sealed to both ends of the hydraulic ring split body and has an oil reservoir port. After the hydraulic ring split is spliced, the oil reservoir ports of two adjacent parts at the splice seam are connected.

[0022] In some embodiments, optionally, two adjacent hydraulic rings are joined together as a whole at the joint by screws.

[0023] In some embodiments, the thin-walled workpiece honing hydraulic clamping fixture may optionally include a locking ring, which is detachably mounted on the upper flange ring. The lower end of the locking ring is inserted into the inner hole of the upper flange ring to axially limit the upper end of the thin-walled workpiece clamped in the middle column section of the plastic skeleton.

[0024] The inner hole at the upper end of the lower flange is smaller than the inner hole of the intermediate column section, which is used to axially limit the lower end of the thin-walled workpiece clamped in the intermediate column section of the plastic skeleton through the upper end of the lower flange; or, the lower flange has a radially protruding limiting step, which is used to axially limit the lower end of the thin-walled workpiece clamped in the intermediate column section of the plastic skeleton.

[0025] In some embodiments, the locking ring can be detachably mounted on the upper flange ring in the following specific structure: the outer wall of the locking ring has a positioning rod, and the inner wall of the upper flange ring has a horizontal locking groove and an insertion notch that cooperate with the positioning rod. The positioning rod enters the horizontal locking groove from top to bottom through the insertion notch, and the locking ring rotates to make the positioning rod rotate away from the insertion notch, thereby achieving axial locking of the locking ring.

[0026] In some embodiments, optionally, the locking ring also has a handle for operating the locking ring to rotate, the handle being positioned above the positioning rods; the positioning rods are evenly distributed circumferentially.

[0027] In some embodiments, optionally, the axial oil grooves are connected at their ends to form a connected serpentine oil groove.

[0028] In some embodiments, optionally, a washer is provided between the upper end of the intermediate column portion of the plastic skeleton and the lower end of the locking ring.

[0029] The beneficial effects of this invention are: the tooling combines rigidity and flexibility, which not only ensures uniform clamping force on thin-walled workpieces and avoids deformation, but also provides stable rigid support to prevent chatter of thin-walled workpieces, ensuring the stability and accuracy of the processing, and providing the necessary reference conditions for ultra-high precision processing of thin-walled workpieces. Attached Figure Description

[0030] The present invention will be further described below with reference to the accompanying drawings and embodiments;

[0031] Figure 1 This is a three-dimensional structural diagram of the present invention;

[0032] Figure 2 This is a top-view structural diagram of the present invention;

[0033] Figure 3 for Figure 2 AA section view;

[0034] Figure 4 for Figure 2 BB cross-sectional view;

[0035] Figure 5 This is a schematic diagram of the locking ring structure of the present invention;

[0036] Figure 6 This is a schematic diagram of the structure of the gasket of the present invention;

[0037] Figure 7 This is a schematic diagram of the upper flange ring of the present invention;

[0038] Figure 8 This is a schematic diagram of the structure of the hydraulic ring split body of the present invention;

[0039] Figure 9 This is a schematic diagram of the split structure of the hydraulic ring of the present invention;

[0040] Figure 10 This is a schematic diagram of the hydraulic ring of the present invention;

[0041] Figure 11 This is a schematic diagram of the structure of the plastic skeleton of the present invention;

[0042] Figure 12 This is a schematic diagram of the lower flange ring of the present invention.

[0043] In the diagram, 1. Plastic skeleton, 1-1. Upper flange, 1-2. Lower flange, 1-3. Intermediate column section, 2. Lower flange ring, 3. Gasket, 4. Upper flange ring, 4-1. Embedded notch, 4-2. Horizontal locking groove, 5. Locking ring, 5-1. Positioning rod, 5-2. Handle rod, 6. Hydraulic ring, 6-1. Hydraulic ring split, 6-2. Upper cover, 6-3. End cover, 6-4. Oil tank port, 6-5. Sealing ring, 7. Oil tank, 9. Oil groove, 9-1. Annular oil groove, 9-2. Axial oil groove, 10. Hydraulic oil injection hole, 11. Guide hole, 12. Plug. Detailed Implementation

[0044] like Figures 1-12As shown, a hydraulic clamping fixture for honing thin-walled workpieces includes a plastic frame 1, a lower flange ring 2, an upper flange ring 4, and a hydraulic ring 6.

[0045] like Figure 11 As shown, the plastic frame 1 has an I-shaped hollow structure. The plastic frame 1 includes a middle column section 1-3, an upper flange 1-1 at the upper end of the middle column section 1-3, and a lower flange 1-2 at the lower end of the middle column section 1-3. The middle column section 1-3 of the plastic frame 1 is used to clamp thin-walled workpieces.

[0046] The lower flange ring 2 is located at the lower end of the plastic frame 1, and the upper flange ring 4 is located at the upper end of the plastic frame 1.

[0047] The hydraulic ring 6 is fitted on the outside of the middle column section 1-3 of the plastic frame 1. The upper flange 1-1 of the plastic frame 1 is clamped between the hydraulic ring 6 and the upper flange 4, and the lower flange 1-2 of the plastic frame 1 is clamped between the hydraulic ring 6 and the lower flange 2.

[0048] like Figure 8 and 9 As shown, the hydraulic ring 6 has an oil reservoir 7 surrounding it. The inner wall of the hydraulic ring 6 has an oil groove 9. The oil groove 9 includes multiple annular oil grooves 9-1 and multiple axial oil grooves 9-2 that connect the annular oil grooves 9-1. The annular oil grooves 9-1 are equidistant from each other along the axial direction. The oil grooves 9 are connected to the oil reservoir 7 through oil guide holes 11. The hydraulic ring 6 is pushed by the oil pressure in the oil grooves 9 to radially expand the intermediate cylindrical part 1-3 of the corresponding area of ​​the oil grooves 9.

[0049] The upper flange ring 4 has a hydraulic oil injection hole 10, which passes through the upper flange ring 4, the upper flange 1-1 of the plastic skeleton 1 and the hydraulic ring 6 in sequence and is connected to the oil tank 7.

[0050] Specifically, the lower flange ring 2, the lower flange 1-2 of the plastic frame 1, and the bottom of the hydraulic ring 6 are fixedly connected by screws, so that the lower flange 1-2 of the plastic frame 1 is clamped between the hydraulic ring 6 and the lower flange ring 2. The upper flange ring 4, the upper flange 1-1 of the plastic frame 1, and the top of the hydraulic ring 6 are fixedly connected by screws, so that the upper flange 1-1 of the plastic frame 1 is clamped between the hydraulic ring 6 and the upper flange ring 4.

[0051] The plastic skeleton 1 is made of polytetrafluoroethylene (PTFE), and the thickness of the intermediate column section 1-3 is 0.15mm to 0.3mm. Of course, it is also possible that the plastic skeleton 1 is made of other types of plastics, such as POM, nylon, PEEK, etc.

[0052] The plastic skeleton 1 is integrally injection molded. The middle column section 1-3 of the plastic skeleton 1 expands under the action of hydraulic pressure to clamp the thin-walled workpiece.

[0053] Of course, it is also possible that the hydraulic ring 6 has a hydraulic oil injection hole 10, which passes through the hydraulic ring 6 and connects to the oil tank 7; or, the lower flange ring 2 has a hydraulic oil injection hole 10, which passes through the lower flange ring 2, the lower flange of the plastic skeleton 1 and the hydraulic ring 6 in sequence and connects to the oil tank 7.

[0054] Specifically, there are two hydraulic oil filling holes 10, one for filling and one for overflowing. After filling, both hydraulic oil filling holes 10 are sealed by plugs 12, at least one of which is a pressure regulating plug. The pressure regulating plug is threaded into the hydraulic oil filling hole 10, and the oil pressure can be adjusted by screwing in or out the pressure regulating plug. After the thin-walled workpiece is processed, the plug 12 is unscrewed to release the pressure and release the thin-walled workpiece.

[0055] Alternatively, after filling with oil, one hydraulic oil injection port 10 can be sealed with a plug 12, and the other hydraulic oil injection port 10 can be connected to an external oil supply mechanism via a connector. The external oil supply mechanism, which can be an electric or manual oil pump, provides oil pressure. After the thin-walled workpiece is processed, the external oil supply mechanism depressurizes, releasing the thin-walled workpiece.

[0056] Each axial oil groove 9-2 is parallel to each other and penetrates all annular oil grooves 9-1. The axial oil grooves 9-2 are evenly arranged circumferentially along the inner wall of the hydraulic ring 6. The axial oil grooves 9-2 are connected at their ends, forming a connected serpentine oil groove network. Of course, it is also possible that the ends of the axial oil grooves 9-2 are not connected.

[0057] The hydraulic ring 6 is a split structure, composed of two hydraulic ring segments 6-1 joined together to form a whole. The seams between the hydraulic ring segments 6-1 have a sealing structure, and each hydraulic ring segment 6-1 is semi-circular. Of course, it is not impossible for the hydraulic ring 6 to be composed of more than one hydraulic ring segment 6-1. The annular oil groove 9-1 is connected or disconnected at the seams of the hydraulic ring segments 6-1. In the attached diagram, the annular oil groove 9-1 is disconnected at the seam of the hydraulic ring segments 6-1.

[0058] By using two or more hydraulic rings 6-1 to assemble a complete ring, the installation of the hydraulic ring 6 onto the I-shaped hollow plastic frame 1 is made convenient; at the same time, a sealing structure is set between the splicing seams of the hydraulic ring 6-1 to ensure the overall sealing effect.

[0059] The hydraulic ring split 6-1 includes a hydraulic ring split body with a U-shaped cross section, an upper cover 6-2 and an end cover 6-3. The upper cover 6-2 is sealed to the top opening of the hydraulic ring split body and is used to form an oil reservoir 7 in the inner cavity of the hydraulic ring split body.

[0060] Specifically, the upper cover 6-2 is sealed to the top opening of the hydraulic ring split body by welding. The upper cover 6-2 is for the convenience of processing the oil tank 7. After the oil tank 7 is processed, the upper cover 6-2 is put on and welded.

[0061] like Figure 9 As shown, end cap 6-3 is sealed to both ends of the hydraulic ring split body. End cap 6-3 has oil reservoir port 6-4. When the hydraulic ring split body 6-1 is spliced, a sealing ring 6-5 is set between two adjacent end caps 6-3 at the splicing seam of the hydraulic ring split body 6-1. The sealing ring 6-5 is located outside the oil reservoir port 6-4 and is used for sealing and connecting two adjacent oil reservoir ports 6-4 at the splicing seam.

[0062] Structural adhesive is also applied between the end faces of the splice joint of hydraulic ring 6-1 for sealing the splice joint of hydraulic ring 6-1. The structural adhesive is applied to the outside of sealing ring 6-5.

[0063] A sealing ring 6-5 is also installed between the hydraulic ring 6 and the plastic skeleton 1 for sealing.

[0064] The U-shaped hydraulic ring consists of an inner ring and an outer ring, with the outer ring fitted over the outer ring. The lower ends of the outer ring and the inner ring are connected by a bottom ring. The hydraulic oil injection hole 10 includes a vertical hole that passes through the upper flange ring 4, the upper flange 1-1 of the plastic skeleton 1, and the inner ring of the hydraulic ring 6 from top to bottom, as well as a horizontal hole that connects the vertical hole and the oil tank 7.

[0065] The two adjacent hydraulic rings, 6-1, are connected as a whole at the splice seam by screws.

[0066] The hydraulic clamping fixture for honing thin-walled workpieces also includes a locking ring 5, which is detachably mounted on the upper flange ring 4. The lower end of the locking ring 5 is inserted into the inner hole of the upper flange ring 4 to provide axial upper limit positioning for the upper end of the thin-walled workpiece clamped in the intermediate column section 1-3 of the plastic skeleton 1.

[0067] like Figure 3 As shown, the inner hole at the upper end of the lower flange ring 2 is smaller than the inner hole of the intermediate column section 1-3, and is used to axially limit the lower end of the thin-walled workpiece clamped in the intermediate column section 1-3 of the plastic skeleton 1 through the upper end of the lower flange ring 2.

[0068] Of course, it is also possible that the lower flange ring 2 has a radially protruding limiting step, which is used to axially limit the lower end of the thin-walled workpiece clamped in the middle column section 1-3 of the plastic skeleton 1.

[0069] like Figure 3 and 7As shown, the specific structure of the locking ring 5 detachably mounted on the upper flange ring 4 is as follows: the outer wall of the locking ring 5 has a positioning rod 5-1, and the inner wall of the upper flange ring 4 has a horizontal locking groove 4-2 and an insertion notch 4-1 that mate with the positioning rod 5-1. The positioning rod 5-1 enters the horizontal locking groove 4-2 from top to bottom through the insertion notch 4-1. The locking ring 5 rotates to disengage the positioning rod 5-1 from the insertion notch 4-1, thereby achieving axial locking of the locking ring 5. The groove width of the horizontal locking groove 4-2 is adapted to the diameter of the positioning rod 5-1.

[0070] The locking ring 5 also has a handle 5-2 for rotating the locking ring 5. The handle 5-2 is located above the positioning rod 5-1. The positioning rods 5-1 are evenly distributed circumferentially.

[0071] The locking ring 5 is a hollow cylindrical structure. There are two positioning rods 5-1 and two grip rods 5-2. The two positioning rods 5-1 are symmetrically arranged on the lower part of the outer wall of the locking ring 5, and the two grip rods 5-2 are symmetrically arranged on the upper part of the outer wall of the locking ring 5. The axis of the positioning rod 5-1 is perpendicular to the axis of the grip rod 5-2.

[0072] A washer 3 is also provided between the upper end of the middle column section 1-3 of the plastic frame 1 and the lower end of the locking ring 5.

[0073] Washer 3 is preferably made of nylon-type plastic material to prevent damage to the end of thin-walled workpiece. By selecting washers 3 of different heights, it can be adapted to thin-walled workpieces of different lengths. Washer 3 does not need to be pressed tightly onto the thin-walled workpiece to prevent the thin-walled workpiece from being deformed during clamping.

[0074] Of course, it is possible to omit washer 3 and directly prevent axial movement of the thin-walled workpiece during honing using locking ring 5. Preferably, locking ring 5, or only the lower end of locking ring 5, is made of nylon-like plastic material to prevent damage to the end of the thin-walled workpiece. By selecting locking rings 5 ​​of different heights, it is possible to accommodate thin-walled workpieces of different lengths. Locking ring 5 does not need to be pressed tightly onto the thin-walled workpiece, preventing deformation of the thin-walled workpiece during clamping.

[0075] The process of honing a thin-walled workpiece using this hydraulic clamping fixture is as follows:

[0076] 1. Insert the thin-walled workpiece to be processed into the middle column section 1-3 of the plastic frame 1, so that its lower end abuts against the upper end face of the inner side of the lower flange ring 2;

[0077] 2. Insert washer 3, which rests on the upper end face of the thin-walled workpiece;

[0078] 3. Install locking ring 5: Align the positioning rod 5-1 of locking ring 5 with the insertion notch 4-1 on the inner side of upper flange ring 4. The positioning rod 5-1 enters the horizontal locking groove 4-2 from top to bottom through the insertion notch 4-1. Then, rotate along the horizontal locking groove 4-2 in a circular direction to make the positioning rod 5-1 rotate away from the insertion notch 4-1, thus completing the installation of locking ring 5. At this time, the washer 3 and locking ring 5 work together to achieve axial upper limit positioning of thin-walled workpiece and prevent thin-walled workpiece from moving up and down during honing.

[0079] 4. Adjust the oil pressure in the honing hydraulic clamping fixture of the thin-walled workpiece to a suitable pressure value by adjusting the pressure plug or external oil supply mechanism, so that the outer wall of the thin-walled workpiece is evenly clamped by the plastic skeleton 1, and the clamping of the thin-walled workpiece is completed.

[0080] 5. After the thin-walled workpiece has been honing, the pressure is released by the pressure regulating plug or the external oil supply mechanism to restore the plastic skeleton 1 to its initial state and release the clamping effect on the outer wall of the thin-walled workpiece.

[0081] 6. Rotate the locking ring 5 in the opposite direction along the horizontal locking groove 4-2 so that the positioning rod 5-1 is aligned with the embedded notch 4-1. Pull the locking ring 5 upward, then remove the washer 3, and finally pull the finished thin-walled workpiece out from the middle column section 1-3 of the plastic frame 1.

[0082] The advantages of using the plastic frame 1 in this invention are:

[0083] The plastic skeleton 1 is both hard and soft compared to existing rubber sleeves and rigid sleeves.

[0084] On the other hand, the plastic skeleton 1 can provide stable rigid support and excellent machinability.

[0085] Rigid load-bearing capacity: The plastic skeleton 1 provides a much higher overall structural rigidity than the rubber sleeve, preventing workpiece chatter and ensuring the stability and accuracy of the processing.

[0086] Machinability: The plastic skeleton 1 has sufficient hardness and strength, and can be directly machined by turning, milling, drilling, tapping and other machining processes, thereby obtaining a curved surface profile close to the outer surface of the thin-walled workpiece to be honed, and ensuring that the plastic skeleton 1 and the thin-walled workpiece have a reasonable gap, which is conducive to clamping the workpiece and picking up and putting down the workpiece.

[0087] The soft aspect is: achieving damage-free clamping and uniform expansion.

[0088] Non-damaging clamping: Compared with metal, plastic has moderate hardness and a smooth surface, which will not scratch the workpiece during clamping.

[0089] Uniform expansion: Under hydraulic pressure, it can elastically deform, expand radially, and hold the workpiece tightly. Moreover, as a macroscopically homogeneous material, plastic exhibits uniform elastic deformation.

[0090] The advantage of expanding the plastic frame 1 using the oil tank 9 instead of the oil reservoir 7 is:

[0091] Annular oil groove 9-1: Multiple annular oil grooves 9-1 form a circumferential pressure distribution ring, which drives the radial expansion of the central cylindrical part 1-3 in the corresponding area of ​​the annular oil groove 9-1. This not only allows the central cylindrical part 1-3 of the plastic skeleton 1 to expand uniformly in the circumferential direction, ensuring that the thin-walled workpiece is uniformly clamped in the circumferential direction, thereby avoiding circumferential out-of-roundness; but also ensures that the expansion amplitude of the corresponding area of ​​each annular oil groove 9-1 is basically uniform in the axial direction, ensuring that the thin-walled workpiece is uniformly clamped in the axial direction, thereby ensuring the high cylindricity of the thin-walled workpiece.

[0092] Axial oil grooves 9-2: Connecting the annular oil grooves 9-1, they form axial pressure transmission columns. They ensure instantaneous pressure balance within all annular oil grooves 9-1, forming a three-dimensional interconnected pressure equalization network. This design eliminates the "pressure islands" between annular oil grooves 9-1, allowing the expansion of the plastic skeleton 1 to be seamlessly connected and highly continuous in the axial direction, further enhancing the uniformity and integrity of axial clamping.

[0093] However, the middle column section 1-3 of the hydraulic frame that expands through a large oil tank is prone to uneven expansion in a "waist drum" shape, that is, the middle of the middle column section 1-3 is high and the two sides are low, which leads to uneven axial clamping and affects the cylindricity of thin-walled workpieces.

Claims

1. A thin-walled workpiece honing hydraulic clamping tool, characterized by: It comprises a plastic skeleton (1), a lower flange ring (2), an upper flange ring (4) and a hydraulic ring (6); The plastic skeleton (1) is in the shape of an I-shaped hollow structure, comprising a middle column cylinder part (1-3), an upper flange (1-1) at the upper end of the middle column cylinder part (1-3) and a lower flange (1-2) at the lower end of the middle column cylinder part (1-3), and the middle column cylinder part (1-3) of the plastic skeleton (1) is used for clamping a thin-walled workpiece; The lower flange ring (2) is located at the lower end of the plastic skeleton (1), and the upper flange ring (4) is located at the upper end of the plastic skeleton (1). The hydraulic ring (6) is sleeved on the outside of the middle column cylinder part (1-3) of the plastic skeleton (1), the upper flange (1-1) of the plastic skeleton (1) is clamped between the hydraulic ring (6) and the upper flange ring (4), and the lower flange (1-2) of the plastic skeleton (1) is clamped between the hydraulic ring (6) and the lower flange ring (2). The hydraulic ring (6) has an oil tank (7) surrounding the hydraulic ring (6) inside, and an oil groove (9) is formed on the inner side wall of the hydraulic ring (6), the oil groove (9) comprises a plurality of annular oil grooves (9-1) and a plurality of axial oil grooves (9-2) communicating with each annular oil groove (9-1), the annular oil grooves (9-1) are equidistantly distributed along the axial direction, the oil groove (9) is communicated with the oil tank (7) through a guide oil hole (11), and the middle column cylinder part (1-3) is pushed by the oil pressure in the oil groove (9) to make the corresponding area of the oil groove (9) of the middle column cylinder part (1-3) radially expand. The upper flange ring (4) has a hydraulic oil injection hole (10) thereon, the hydraulic oil injection hole (10) passes through the upper flange ring (4), the upper flange (1-1) of the plastic skeleton (1) and the hydraulic ring (6) in sequence and is communicated with the oil tank (7). Alternatively, the hydraulic ring (6) has a hydraulic oil injection hole (10) thereon, the hydraulic oil injection hole (10) passes through the hydraulic ring (6) and is communicated with the oil tank (7). Alternatively, the lower flange ring (2) has a hydraulic oil injection hole (10) thereon, the hydraulic oil injection hole (10) passes through the lower flange ring (2), the lower flange (1-2) of the plastic skeleton (1) and the hydraulic ring (6) in sequence and is communicated with the oil tank (7).

2. The thin-walled workpiece honing hydraulic clamping tool according to claim 1, characterized in that: Each axial oil groove (9-2) is parallel to each other and penetrates all annular oil grooves (9-1), and the axial oil grooves (9-2) are uniformly arranged along the circumferential direction of the inner side wall of the hydraulic ring (6).

3. The thin-walled workpiece honing hydraulic clamping tool of claim 1, wherein: The hydraulic ring (6) is in a split structure, which is composed of at least two hydraulic ring split bodies (6-1) to form an integral whole, the split seams between the hydraulic ring split bodies (6-1) have a sealing structure, and the annular oil grooves (9-1) are communicated or disconnected at the split seams of the hydraulic ring split bodies (6-1).

4. The thin-walled workpiece honing hydraulic clamping tool according to claim 3, characterized in that: The hydraulic ring split body (6-1) has two and is in the shape of a semicircle.

5. The thin-walled workpiece honing hydraulic clamping tool of claim 3, wherein: The hydraulic ring split body (6-1) comprises a hydraulic ring split body with a U-shaped section, an upper cover (6-2) and an end cover (6-3), the upper cover (6-2) is sealingly connected to the top opening of the hydraulic ring split body, and is used for forming an oil reservoir (7) in the inner cavity of the hydraulic ring split body, and the end cover (6-3) is sealingly connected to both ends of the hydraulic ring split body, and the end cover (6-3) has an oil reservoir oil port (6-4), and after the hydraulic ring split body (6-1) is spliced, the adjacent two oil reservoir oil ports (6-4) at the splicing joint are communicated.

6. The thin-walled workpiece honing hydraulic clamping fixture of claim 3, wherein: The adjacent two hydraulic ring split bodies (6-1) are connected into a whole through screws at the splicing joint.

7. The thin-walled workpiece honing hydraulic clamping fixture of claim 1, wherein: The locking ring (5) is detachably mounted on the upper flange ring (4), the lower end of the locking ring (5) is inserted into the inner hole of the upper flange ring (4), and is used for axially positioning the upper end of the thin-walled workpiece clamped in the middle columnar portion (1-3) of the plastic framework (1). The inner hole of the upper end of the lower flange ring (2) is smaller than the inner hole of the middle columnar portion (1-3), and is used for axially positioning the lower end of the thin-walled workpiece clamped in the middle columnar portion (1-3) of the plastic framework (1) through the upper end of the lower flange ring (2); or, the lower flange ring (2) has a radially protruding limiting step, which is used for axially positioning the lower end of the thin-walled workpiece clamped in the middle columnar portion (1-3) of the plastic framework (1).

8. The thin-walled workpiece honing hydraulic clamping fixture according to claim 7, characterized in that: The specific structure that the locking ring (5) is detachably mounted on the upper flange ring (4) is that the outer wall of the locking ring (5) has a positioning rod (5-1), the inner wall of the upper flange ring (4) has a horizontal locking groove (4-2) and an embedding notch (4-1) matched with the positioning rod (5-1), the positioning rod (5-1) enters the horizontal locking groove (4-2) from top to bottom through the embedding notch (4-1), and the locking ring (5) is axially locked by rotating the positioning rod (5-1) to rotate away from the embedding notch (4-1).

9. The thin-walled workpiece honing hydraulic clamping fixture according to claim 8, characterized in that: The locking ring (5) further has a handle (5-2) for rotating the locking ring (5), and the handle (5-2) is located above the positioning rod (5-1); and the positioning rods (5-1) are uniformly distributed in the circumferential direction.

10. The thin-walled workpiece honing hydraulic clamping fixture of claim 2, wherein: The axial oil grooves (9-2) are communicated at the ends to form a communicated serpentine oil groove.

11. The thin-walled workpiece honing hydraulic clamp fixture of claim 7, wherein: The middle columnar portion (1-3) of the plastic framework (1) has a gasket (3) between the upper end and the lower end of the locking ring (5).

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