Anti-deformation composite clamp for hard turning of thin-walled workpiece

Abstract

An anti-deformation composite clamp for hard turning of a thin-walled workpiece comprises a clamp body and a plurality of clamping jaws circumferentially and evenly distributed on the right side of the clamp body, and a movable groove is formed in the center of the left end face of the clamp body. A base plate attached to the clamp body is arranged on the left end face of the clamp body. A guide hole coaxial with the movable groove is formed in the center of the seat plate, and the diameter of the guide hole is smaller than that of the movable groove; a limiting sleeve coaxial with the guide hole is arranged on the side wall of the left side of the seat plate; a sliding seat matched with the guide hole is arranged in the guide hole; a connecting shaft is arranged in the center of the left end face of the sliding seat and penetrates through an inner hole of the limiting sleeve leftwards. A pushing plate located in the movable groove is arranged at the right end of the sliding base. An embedding groove is formed in the center of the right end face of the clamp body. And a clamping structure matched with the caulking groove is arranged in the caulking groove. According to the hard turning anti-deformation composite clamp for the thin-wall part, the concentricity of the thin-wall part can be limited, meanwhile, the situation that the thin-wall part is deformed is avoided, and the anti-deformation effect is achieved.

Description

Technical Field

[0001] The present invention relates to the field of machine tools, and in particular to a composite fixture for preventing deformation during hard turning of thin-walled parts. Background Art

[0002] A machine tool fixture is a device used for clamping tools on a machine tool. Traditional machine tool fixtures mainly rely on a rubber expansion sleeve to squeeze inward to form a clamping force to clamp thin-walled parts. Since the clamping force mainly relies on this force from the outside to the inside to clamp the thin-walled parts, this clamping force is extremely large. If the thin-walled part is a solid structure, with the support of a relatively thick wall thickness, this clamping force will not cause deformation of the thin-walled part. However, in the actual machining process, thin-walled annular thin-walled parts (i.e., thin-walled parts) are often machined. When the thin-walled part is clamped on the outer peripheral surface by this strong clamping force, due to its own thin wall thickness, it is extremely easy to deform, resulting in damage to the thin-walled part. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a composite fixture for preventing deformation during hard turning of thin-walled parts, which can limit the concentricity of the thin-walled part and avoid deformation of the thin-walled part, achieving an anti-deformation effect.

[0004] The technical solution adopted by the present invention to solve the above technical problems is as follows:

[0005] The present invention discloses a composite fixture for preventing deformation during hard turning of thin-walled parts, including a fixture main body and a plurality of clamping jaws evenly distributed in a circle on the right side of the fixture main body. A movable groove is provided at the center of the left end face of the fixture main body; a seat plate is provided on the left end face of the fixture main body and is attached thereto; a guiding hole coaxial with the movable groove is provided at the center of the seat plate, and the diameter of the guiding hole is smaller than the diameter of the movable groove; a limiting sleeve coaxial with the guiding hole is provided on the left side wall of the seat plate; a sliding seat matching the guiding hole is provided in the guiding hole; a connecting shaft is provided at the center of the left end face of the sliding seat, and the connecting shaft passes through the inner hole of the limiting sleeve to the left; a pushing plate located in the movable groove is provided at the right end of the sliding seat; an embedding groove is provided at the center of the right end face of the fixture main body; a clamping structure matching the embedding groove is provided in the embedding groove; a plurality of telescopic holes corresponding to the positions of the clamping jaws are provided on the right end face of the fixture main body, and the left end of the telescopic hole communicates with the movable groove; a telescopic shaft matching the telescopic hole is provided in the telescopic hole, and the clamping jaw is provided at the right end of the telescopic shaft; a limiting block corresponding to the position of the movable groove is provided at the left end of the telescopic shaft; a guiding groove matching the pushing plate is provided on one side of the limiting block; the clamping structure includes a rubber expansion sleeve provided in the embedding groove; a plurality of limiting steps evenly distributed in a circle are provided on the inner wall of the right end of the rubber expansion sleeve; a clamping member matching the right-step surface of the limiting step is provided on the right-step surface of the limiting step; the clamping member has elasticity.

[0006] The clamping structure further includes an inner conical surface provided on the inner wall of the notch of the embedding groove, and the inner conical surface is narrow on the left and wide on the right; an outer conical surface that is narrow on the left and wide on the right is provided on the outer wall of the right end of the rubber expansion sleeve, and the outer conical surface is in fit with the inner conical surface; a backing is provided inside the rubber expansion sleeve and is matched with the rubber expansion sleeve, and a groove is provided at the center of the right end face of the backing; a plurality of movable openings that communicate with the inner space thereof are provided on the outer wall of the rubber expansion sleeve; a plurality of positioning holes corresponding to the positions of the movable openings are provided on the outer wall of the backing; a plurality of screw holes that communicate with the movable openings are provided on the outer wall of the fixture body; a positioning screw that is matched with the screw hole is screwed in the screw hole, and the end of the positioning screw passes through the movable opening and is located in the positioning hole; a plurality of sliding holes that communicate with the inner space thereof are provided on the left end face of the rubber expansion sleeve; a plurality of guiding columns that are matched with the sliding holes are provided at the bottom of the embedding groove; the guiding columns and the backing are fixed by a plurality of fixing screws.

[0007] A plurality of auxiliary holes that communicate with the inner space thereof are provided on the left end face of the rubber expansion sleeve; a plurality of limiting holes coaxial with the auxiliary holes are provided on the left end face of the backing; a plurality of ejector rods coaxial with the auxiliary holes are provided at the bottom of the embedding groove; the right end of the ejector rod passes through the auxiliary hole to the right and penetrates into the limiting hole.

[0008] A first moving hole is provided at the center of the bottom of the movable groove; a second moving hole that communicates with the first moving hole is provided at the center of the bottom of the embedding groove; the diameter of the second moving hole is larger than that of the first moving hole; a second moving block that is matched with the second moving hole is provided in the second moving hole, and the second moving block and the rubber expansion sleeve are fixed by a plurality of fastening screws; a first moving block is provided at the center of the left end face of the second moving block; a receiving hole is provided at the center of the right end face of the slide seat; a central shaft is provided at the center of the left end face of the first moving block; the left end of the central shaft penetrates into the receiving hole to the left and is screwed with a limiting nut; a left annular gasket sleeved on the central shaft is provided on the right side of the limiting nut; a right annular gasket sleeved on the central shaft is provided at the bottom of the movable groove; a clamping spring sleeved on the central shaft is provided between the left annular gasket and the right annular gasket.

[0009] A limiting chute is provided on the inner wall of one side of the guiding hole; a key groove opposite to the limiting chute is provided on the outer peripheral surface of the slide seat; a limiting key that is matched with the key groove is provided in the key groove; the outer end of the limiting key protrudes into the limiting chute; a plurality of pushing parts that are matched with the guiding groove are provided on the outer peripheral surface of the pushing plate; a sliding arc surface is provided at the outer edge of the pushing part; a guiding arc surface that is matched with the sliding arc surface is provided in the guiding groove; the middle part of the guiding arc surface is a spiral surface.

[0010] A thin-walled part is clamped between the right end face of the backing and the left side wall of the clamping jaw; the clamping part has an elastic part, and the elastic part presses on the outer peripheral surface of the thin-walled part.

[0011] One side wall of the clamping member opposite to the thin-walled member has an elastic notch, and the elastic part is located in the middle of the elastic notch; the elastic part is connected to the inner walls on both sides of the elastic notch through a connecting plate; one end of the connecting plate away from the elastic part inclines outwards.

[0012] The inner wall of the elastic notch, the connecting plate and the elastic part enclose an elastic cavity; an elastic block matching with the elastic cavity is arranged in the elastic cavity.

[0013] The material of the elastic block is a high-strength elastic material.

[0014] A plurality of limiting counterbores are arranged on the clamping member; limiting screw holes corresponding to the positions of the limiting counterbores are arranged on the limiting steps; a limiting screw passes through the limiting counterbore and is screwed into the corresponding limiting screw hole.

[0015] The beneficial effects of the present invention are as follows:

[0016] Compared with the prior art, the anti-deformation composite fixture for hard turning of thin-walled parts adopting the structure of the present invention can not only axially limit the thin-walled parts by using the backing and the clamping jaws, but also radially limit the thin-walled parts by using the clamping members uniformly distributed in a circle, so as to clamp the thin-walled parts when being restricted in both the axial direction and the radial direction. The force exerted by the clamping member on the outer peripheral surface of the thin-walled part depends on the elastic part, and the elastic part has elasticity, which can effectively weaken the clamping force actually applied by the elastic part on the outer peripheral surface of the thin-walled part, so as to effectively avoid the situation that the pressure applied on the outer peripheral surface of the thin-walled part is too large to cause the deformation of the thin-walled part while ensuring that the clamping member clamps the outer peripheral surface of the thin-walled part by using the elastic part, achieving the anti-deformation effect. Description of the Drawings

[0017] Figure 1 is a sectional view of the anti-deformation composite fixture for hard turning of thin-walled parts of the present invention at an angle;

[0018] Figure 2 is a partial structural schematic diagram of the anti-deformation composite fixture for hard turning of thin-walled parts of the present invention;

[0019] Figure 3 is a structural schematic diagram of the push plate;

[0020] Figure 4 is a structural schematic diagram of the telescopic shaft;

[0021] Figure 5 is a three-dimensional view of the anti-deformation composite fixture for hard turning of thin-walled parts of the present invention;

[0022] Figure 6 is a sectional view of the anti-deformation composite fixture for hard turning of thin-walled parts of the present invention at another angle;

[0023] Figure 7It is a schematic structural diagram when a clamping member is assembled on the inner wall of the rubber expansion sleeve;

[0024] Figure 8 It is a schematic structural diagram of the clamping member. Specific embodiments

[0025] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments:

[0026] Please refer to Figures 1 to 8 , the present invention provides a composite fixture for preventing deformation during hard turning of thin-walled parts, including a fixture body 1 and a plurality of jaws 2 evenly distributed in a circle on the right side of the fixture body 1. A movable groove 3 is provided at the center of the left end face of the fixture body 1; a seat plate 4 is provided on the left end face of the fixture body 1 and is in contact with it; a guide hole 5 coaxial with the movable groove 3 is provided at the center of the seat plate 4, and the diameter of the guide hole 5 is smaller than the diameter of the movable groove 3; a limiting sleeve 6 coaxial with the guide hole 5 is provided on the left side wall of the seat plate 4; a sliding seat 7 matching the guide hole 5 is provided in the guide hole 5; a connecting shaft 8 is provided at the center of the left end face of the sliding seat 7, and the connecting shaft 8 passes through the inner hole of the limiting sleeve 6 to the left; a pushing plate 9 located in the movable groove 3 is provided at the right end of the sliding seat 7; an embedding groove 10 is provided at the center of the right end face of the fixture body 1; a clamping structure matching the embedding groove 10 is provided in the embedding groove 10; a plurality of telescopic holes 11 corresponding to the positions of the jaws 2 are provided on the right end face of the fixture body 1, and the left end of the telescopic hole 11 communicates with the movable groove 3; a telescopic shaft 12 matching the telescopic hole 11 is provided in the telescopic hole 11, and the jaw 2 is provided at the right end of the telescopic shaft 12; a limiting block 13 corresponding to the position of the movable groove 3 is provided at the left end of the telescopic shaft 12; a guiding groove 14 matching the pushing plate 9 is provided on one side of the limiting block 13; the clamping structure includes a rubber expansion sleeve 15 provided in the embedding groove 10; a plurality of limiting steps 48 evenly distributed in a circle are provided on the inner wall of the right end of the rubber expansion sleeve 15; a clamping member 49 matching the right step surface of the limiting step 48 is provided on the right side of the limiting step 48; the clamping member 49 has elasticity.

[0027] The clamping structure further includes an inner conical surface 16 provided on the inner wall of the notch of the embedding groove 10, and the inner conical surface 16 is narrow on the left and wide on the right; an outer conical surface 17 that is narrow on the left and wide on the right is provided on the outer wall of the right end of the rubber expansion sleeve 15, and the outer conical surface 17 is in fit with the inner conical surface 16; a backing 18 matching with the rubber expansion sleeve 15 is arranged inside the rubber expansion sleeve 15, and a groove 19 is formed at the center of the right end face of the backing 18; a plurality of movable openings 20 communicating with the inner space thereof are formed on the outer wall of the rubber expansion sleeve 15; a plurality of positioning holes 21 corresponding to the positions of the movable openings 20 are formed on the outer wall of the backing 18; a plurality of screw holes 22 communicating with the movable openings 20 are formed on the outer wall of the fixture main body 1; a positioning screw 23 matching with the screw hole 22 is screwed in the screw hole 22, and the end of the positioning screw 23 passes through the movable opening 20 and is located in the positioning hole 21; a plurality of sliding holes 24 communicating with the inner space thereof are formed on the left end face of the rubber expansion sleeve 15; a plurality of guiding columns 25 matching with the sliding holes 24 are arranged at the bottom of the embedding groove 10; the guiding columns 25 and the backing 18 are fixed by a plurality of fixing screws 26.

[0028] A plurality of auxiliary holes 27 communicating with the inner space thereof are formed on the left end face of the rubber expansion sleeve 15; a plurality of limiting holes 28 coaxial with the auxiliary holes 27 are formed on the left end face of the backing 18; a plurality of ejector rods 29 coaxial with the auxiliary holes 27 are arranged at the bottom of the embedding groove 10; the right end of the ejector rod 29 penetrates through the auxiliary hole 27 to the right and penetrates into the limiting hole 28.

[0029] A first moving hole 30 is formed at the center of the bottom of the movable groove 3; a second moving hole 31 communicating with the first moving hole 30 is formed at the center of the bottom of the embedding groove 10; the diameter of the second moving hole 31 is larger than that of the first moving hole 30; a second moving block 32 matching with the second moving hole 31 is arranged in the second moving hole 31, and the second moving block 32 and the rubber expansion sleeve 15 are fixed by a plurality of fastening screws 33; a first moving block 34 is formed at the center of the left end face of the second moving block 32; a receiving hole 35 is formed at the center of the right end face of the sliding seat 7; a central shaft 36 is formed at the center of the left end face of the first moving block 34; the left end of the central shaft 36 penetrates into the receiving hole 35 to the left and is screwed with a limiting nut 37; a left annular gasket 38 sleeved on the central shaft 36 is arranged on the right side of the limiting nut 37; a right annular gasket 39 sleeved on the central shaft 36 is arranged at the bottom of the movable groove 3; a clamping spring 40 sleeved on the central shaft 36 is arranged between the left annular gasket 38 and the right annular gasket 39.

[0030] On one inner wall of the guiding hole 5, there is a limiting sliding groove 41; on the outer peripheral surface of the sliding seat 7, there is a key groove 42 opposite to the limiting sliding groove 41; in the key groove 42, there is a limiting key 43 matching with it; the outer end of the limiting key 43 protrudes into the limiting sliding groove 41; on the outer peripheral surface of the pushing plate 9, there are a number of pushing parts 44 matching with the guiding groove 14; the outer edge of the pushing part 44 has a sliding arc surface 45; in the guiding groove 14, there is a guiding arc surface 46 matching with the sliding arc surface 45; the middle part of the guiding arc surface 46 is a spiral surface 4601.

[0031] Between the right end surface of the backrest 18 and the left side wall of the clamping jaw 2, there is a thin-walled part 47 clamped; the clamping part 49 has an elastic part 50, and the elastic part 50 presses on the outer peripheral surface of the thin-walled part 47.

[0032] On one side wall of the clamping part 49 opposite to the thin-walled part 47, there is an elastic notch 51, and the elastic part 50 is located in the middle of the elastic notch 51; both between the elastic part 50 and the inner walls on both sides of the elastic notch 51 are connected by a connecting plate 52; one end of the connecting plate 52 far from the elastic part 50 inclines outwards.

[0033] The inner wall of the elastic notch 51, the connecting plate 52 and the elastic part 50 enclose to form an elastic cavity 53; in the elastic cavity 53, there is an elastic block matching with it.

[0034] The material of the elastic block is a high-strength elastic material.

[0035] On the clamping part 49, there are a number of limiting counterbores 54; on the limiting step 48, there are limiting screw holes 55 corresponding to the positions of the limiting counterbores 54; a limiting screw 56 passes through the limiting counterbore 54 and is screwed into the corresponding limiting screw hole 55.

[0036] The using method of the present invention is as follows:

[0037] The left end of the connecting shaft 8 can be connected to the piston rod of the hydraulic cylinder. When it is necessary to take out the processed thin-walled part from the chuck, the hydraulic cylinder can be started, so that the piston rod of the hydraulic cylinder drives the connecting shaft 8 to move to the right, thereby realizing the rightward movement of the slide block 7. When the slide block 7 moves to the right, the push plate 9 moves to the right synchronously, and several pushing parts 44 on the outer edge of the push plate 9 are stuck in the guiding groove 14. When the pushing part 44 moves to the right, the sliding arc surface 45 on the outer edge of the pushing part 44 will rub against the guiding arc surface 46, so that the limiting block 13 is pushed to the right under the action of this frictional force, thereby realizing the rightward movement of the telescopic shaft 12. When the telescopic shaft 12 moves to the right, the clamping jaw 2 will move away from the end face of the rubber expansion sleeve 15 to the right. There is a spiral surface 4601 in the middle of the guiding arc surface 46. When the pushing part 44 moves axially, as the sliding arc surface 45 comes into contact with the spiral surface 4601, the sliding arc surface 45 will squeeze the spiral surface 4601, so that the limiting block 13 and the telescopic shaft 12 rotate along the spiral track of the spiral surface 4601, causing the clamping jaw 2 to rotate while moving to the right. The clamping jaw 2 that originally blocked the right side of the right end port of the rubber expansion sleeve 15 moves out of the range of the right end port of the rubber expansion sleeve 15, so that there is no obstacle at the right end port of the rubber expansion sleeve 15. After the limiting block 13 moves to the right for a certain distance, it will come into contact with the bottom of the movable groove 3. At this time, the bottom of the movable groove 3 can effectively limit the rightward movement stroke of the clamping jaw 2 and prevent the rightward movement stroke of the clamping jaw 2 from being too large.

[0038] After the connecting shaft 8 and the slide block 7 move to the right for a certain distance, the bottom of the receiving hole 35 will push the limiting nut 37 to the right, and the clamping spring 40 is compressed and generates an elastic force. At this time, the central shaft 36 moves to the right synchronously. When the central shaft 36 moves to the right, the central shaft 36 will drive the rubber expansion sleeve 15 to move to the right through the first moving block 34 and the second moving block 32. After the rubber expansion sleeve 15 moves to the right, the inner conical surface 16 on the inner wall of the right end slot of the embedding groove 10 no longer squeezes the outer conical surface 17 inward. At this time, the right end port of the rubber expansion sleeve 15 expands outward under the action of the rubber elastic force, and the thin-walled part can be easily taken out from the right end port of the rubber expansion sleeve 15. And when there is no obstacle at the right end port of the rubber expansion sleeve 15, the thin-walled part can be quickly disassembled. Then, a new thin-walled part can be placed into the right end port of the rubber expansion sleeve 15.

[0039] When the new thin-walled part is placed in the rubber expansion sleeve 15, the left end face of the thin-walled part is fitted with the right end face of the backrest 18, and then the connecting shaft 8 can be pulled to the left by the hydraulic cylinder. When the connecting shaft 8 drives the slide seat 7 to move to the left, the bottom of the accommodating hole 35 no longer pushes the limit nut 37 to the left. At this time, the center shaft 36 is moved to the left and reset under the elastic force of the clamping spring 40, thereby realizing the left reset of the rubber expansion sleeve 15. Since the inner conical surface 16 and the outer conical surface 17 are both narrow on the left and wide on the right, when the rubber expansion sleeve 15 moves to the left, the inner conical surface 16 will squeeze the outer conical surface 17 inward, so that the rubber expansion sleeve 15 is contracted, thereby causing the clamping parts 49 evenly distributed on the circumference to contract and close the thin-walled part. The wall part 47 is clamped, and while the connecting shaft 8 drives the sliding seat 7 to move left, the pushing part 44 on the pushing plate 9 moves left synchronously. As the sliding arc surface 45 on the outer edge of the pushing part 44 contacts the guiding arc surface 46 and the spiral surface 4601, the telescopic shaft 12 drives the clamping jaw 2 to rotate and move to the left. Finally, the clamping jaw 2 is again on the right side of the right end port of the rubber expansion sleeve 15, and the end of the clamping jaw 2 is pressed on the right end surface of the thin-walled part 47. At this time, the thin-walled part 47 is clamped between the right end surface of the backrest 18 and the left side wall of the end of the clamping jaw 2. At the same time, the outer peripheral surface of the thin-walled part 47 is clamped by the elastic part 50 of the clamping part 49, which ensures the stability of the thin-walled part 47 after loading to the greatest extent.

[0040] It can be seen from this that, by only driving the slide 7 to move a certain distance to the right through the connecting shaft 8, the telescopic shaft 12 can be controlled to drive the clamp 2 to rotate and move to the right at the same time, and the right movement of the clamp 2 can be limited by blocking the limit block 13 at the bottom of the movable groove 3, thereby ensuring that the clamp 2 only moves a short distance. Therefore, even if the clamp 2 no longer clamps the thin-walled part, the gap between the clamp 2 and the right end face of the rubber expansion sleeve 15 is extremely small, and the staff's hand cannot be inserted into the gap between the clamp 2 and the right end face of the rubber expansion sleeve 15. This can achieve normal loading and unloading of the thin-walled part 47 while avoiding the staff's hand being pinched or pressed during loading and unloading.

[0041] When the elastic portion 50 of the clamping member 49 is clamped on the outer peripheral surface of the thin-walled member, the elastic portion 50 can effectively weaken the clamping force actually applied by the elastic portion 50 to the outer wall of the thin-walled member 47 due to its elasticity, thereby ensuring that the clamping member 49 uses the elastic portion 50 to clamp the outer wall of the thin-walled member 47 while effectively avoiding excessive pressure applied to the outer wall of the thin-walled member 47, causing deformation of the thin-walled member 47, thereby achieving an anti-deformation effect.

[0042] A clamping spring 40 is provided between the left annular gasket 38 and the right annular gasket 39 and is sleeved outside the central axis 36. The existence of the left annular gasket 38 and the right annular gasket 39 can effectively increase the contact area at the left and right ends of the clamping spring 40, thereby ensuring the stability of the clamping spring 40 when it is compressed to generate elastic force.

[0043] The left end face of the rubber expansion sleeve 15 is provided with a number of sliding holes 24 that communicate with its internal space. The bottom of the embedding groove 10 is provided with a number of guiding columns 25 that match the sliding holes 24. The existence of the guiding columns 25 can play a guiding role when the rubber expansion sleeve 15 moves, ensuring the stability of the rubber expansion sleeve 15 during movement. And the width of the movable opening 20 is greater than the diameter of the positioning screw 23. Therefore, even if the positioning screw 23 passes through the movable opening 20, the rubber expansion sleeve 15 can still axially move through the movable opening 20.

[0044] The left end face of the rubber expansion sleeve 15 is provided with a number of auxiliary holes 27 that communicate with its internal space. The left end face of the backstop 18 is provided with a number of limiting holes 28 that are coaxial with the auxiliary holes 27. The bottom of the embedding groove 10 is provided with a number of ejector rods 29 that are coaxial with the auxiliary holes 27. The right end of the ejector rod 29 passes through the auxiliary hole 27 to the right and penetrates into the limiting hole 28. The existence of the ejector rod 29 can play an auxiliary guiding effect when the rubber expansion sleeve 15 moves, further ensuring the stability of the rubber expansion sleeve 15 during movement.

[0045] One inner wall of the guiding hole 5 is provided with a limiting sliding groove 41. The outer peripheral surface of the sliding seat 7 is provided with a key groove 42 opposite to the limiting sliding groove 41. A limiting key 43 that matches the key groove 42 is provided in the key groove 42. The outer end of the limiting key 43 protrudes into the limiting sliding groove 41. The existence of the limiting key 43 can ensure that the sliding seat 7 does not rotate when moving left and right, so that the pushing plate 9 does not rotate when moving left and right, ensuring that the pushing part 44 of the pushing plate 9 always moves in the guiding groove 14, and ensuring the stability of the movement and rotation of the clamping jaw 2.

[0046] Between the fixture main body 1 and the seat plate 4, and between the seat plate 4 and the limiting sleeve 6 are fixed by a number of screws. This fixing method can not only ensure the stability between the fixture main body 1 and the seat plate 4, and between the seat plate 4 and the limiting sleeve 6, but also facilitate disassembly.

[0047] One side wall of the clamping member 49 opposite to the thin-walled member 47 has an elastic notch 51. The elastic part 50 is located in the middle of the elastic notch 51. The elastic part 50 and the inner walls on both sides of the elastic notch 51 are connected by a connecting plate 52. One end of the connecting plate 52 away from the elastic part 50 is inclined outward. The existence of the elastic notch 51 enables the elastic part to deform to a certain extent when clamping the outer peripheral surface of the thin-walled member 47, thereby generating an elastic force and playing an effect of weakening the clamping force. At the same time, with the inclined setting of the connecting plate 52, only the elastic part 50 presses on the outer peripheral surface of the thin-walled member 47, effectively reducing the contact area between the clamping member 49 and the thin-walled member 47, thereby further avoiding the situation that the clamping force applied by the clamping member 49 on the outer peripheral surface of the thin-walled member 47 is too large and causing the thin-walled member 47 to deform.

[0048] The inner wall of the elastic notch 51, the connecting plate 52, and the elastic part 50 enclose an elastic cavity 53. An elastic block matching the elastic cavity 53 is arranged inside the elastic cavity 53. The elastic block can control the clamping pressure of the elastic part 50 through its own elasticity. When the material of the elastic block is a high-strength elastic material, the elastic force generated by the high-strength elastic material can be converted into the clamping force of the elastic part 50, so that the clamping force of the elastic part 50 can be controlled at a small pressure state required in practice through the high-strength elastic material, and the clamping force of the clamping member 49 is avoided from being too large to the greatest extent.

[0049] A plurality of limiting counterbores 54 are arranged on the clamping member 49, and limiting screw holes 55 corresponding to the positions of the limiting counterbores 54 are arranged on the limiting step 48. A limiting screw 56 passes through the limiting counterbore 54 and is screwed into the corresponding limiting screw hole 55. This fixing method facilitates the disassembly between the clamping member 49 and the limiting step 48 and is beneficial to the maintenance and replacement of the clamping member 49.

Claims

1. A composite clamp for hard turning thin-walled parts to prevent deformation, comprising a clamp body and a plurality of clamping claws evenly distributed on the right side of the clamp body, characterized in that: A movable groove is provided at the center of the left end face of the clamp body; a seat plate is provided on the left end face of the clamp body to fit therewith; a guide hole is provided at the center of the seat plate to be coaxial with the movable groove, and the diameter of the guide hole is smaller than the diameter of the movable groove; a limit sleeve is provided on the left side wall of the seat plate to be coaxial with the guide hole; a sliding seat matching therewith is provided in the guide hole; a connecting shaft is provided at the center of the left end face of the sliding seat, and the connecting shaft passes through the inner hole of the limiting sleeve to the left; a pushing plate located in the movable groove is provided at the right end of the sliding seat; an embedding groove is provided at the center of the right end face of the clamp body; a locking structure matching therewith is provided in the embedding groove ; The right end face of the clamp body is provided with a plurality of telescopic holes corresponding to the position of the clamping claw, and the left end of the telescopic hole is connected with the movable groove; a telescopic shaft matching it is provided in the telescopic hole, and the clamping claw is provided at the right end of the telescopic shaft; a limit block corresponding to the position of the movable groove is provided at the left end of the telescopic shaft; a guide groove matching the push plate is provided on one side of the limit block; the locking structure includes a rubber expansion sleeve arranged in the embedded groove; a plurality of limit steps evenly distributed in a circle are provided on the inner wall of the right end of the rubber expansion sleeve; a clamping piece matching it is provided on the right step surface of the limit step; the clamping piece is elastic.

2. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 1, characterized in that: The locking structure also includes an inner conical surface arranged on the inner wall of the embedded groove, the inner conical surface is narrow on the left and wide on the right; the outer wall of the right end of the rubber expansion sleeve is provided with an outer conical surface that is narrow on the left and wide on the right, and the outer conical surface fits the inner conical surface; a backrest matching it is provided inside the rubber expansion sleeve, and the center of the right end surface of the backrest has a groove; the outer wall of the rubber expansion sleeve is provided with a plurality of movable openings communicating with its internal space; the outer wall of the backrest is provided with a plurality of positioning holes corresponding to the positions of the movable openings; the outer wall of the clamp body is provided with a plurality of screw holes communicating with the movable openings; a positioning screw matching it is screwed in the screw hole, and the end of the positioning screw passes through the movable opening and is located in the positioning hole; the left end surface of the rubber expansion sleeve is provided with a plurality of sliding holes communicating with its internal space; the bottom of the embedded groove is provided with a plurality of guide columns matching the sliding holes; the guide columns and the backrest are fixed by a plurality of fixing screws.

3. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 2, characterized in that: The left end face of the rubber expansion sleeve is provided with a plurality of auxiliary holes which are connected with its internal space; the left end face of the backrest is provided with a plurality of limiting holes which are coaxial with the auxiliary holes; the bottom of the embedding groove is provided with a plurality of push rods which are coaxial with the auxiliary holes; the right end of the push rod passes through the auxiliary hole to the right and enters into the limiting hole.

4. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 2, characterized in that: A first moving hole is provided at the center of the bottom of the movable groove; a second moving hole is provided at the center of the bottom of the embedded groove and is connected with the first moving hole; the diameter of the second moving hole is larger than the diameter of the first moving hole; a second moving block matching it is provided in the second moving hole, and the second moving block and the rubber expansion sleeve are fixed by a number of fastening screws; a first moving block is provided at the center of the left end face of the second moving block; a receiving hole is provided at the center of the right end face of the sliding seat; a center axis is provided at the center of the left end face of the first moving block; the left end of the center axis is inserted into the receiving hole to the left and is screwed with a limiting nut; a set of left annular gaskets outside the center axis is provided on the right side of the limiting nut; a set of right annular gaskets outside the center axis is provided at the bottom of the movable groove; a clamping spring sleeved outside the center axis is provided between the left annular gasket and the right annular gasket.

5. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 1, characterized in that: A limiting slide groove is provided on the inner wall of one side of the guide hole; a key groove opposite to the limiting slide groove is provided on the outer peripheral surface of the slide seat; a limiting key matching therewith is provided in the key groove; the outer end of the limiting key protrudes into the limiting slide groove; a plurality of pushing parts matching the guide groove are provided on the outer peripheral surface of the push plate; the outer edge of the pushing part has a sliding arc surface; the guide groove has a guiding arc surface matching the sliding arc surface; the middle part of the guiding arc surface is a spiral surface.

6. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 2, characterized in that: A thin-walled part is clamped between the right end surface of the backrest and the left side wall of the clamping claw; the clamping part has an elastic part, and the elastic part is pressed on the outer peripheral surface of the thin-walled part.

7. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 6, characterized in that: The side wall of the clamping member opposite to the thin-walled member has an elastic notch, and the elastic part is located in the middle of the elastic notch; the elastic part and the inner walls on both sides of the elastic notch are connected by a connecting plate; the end of the connecting plate away from the elastic part is inclined outward.

8. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 7, characterized in that: The inner wall of the elastic notch, the connecting plate and the elastic part are enclosed to form an elastic cavity; An elastic block matching the elastic cavity is arranged in the elastic cavity.

9. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 8, characterized in that: The elastic block is made of high-strength elastic material.

10. The anti-deformation composite fixture for hard turning of thin-walled parts according to claim 8, characterized in that: The clamping member is provided with a plurality of limiting countersunk holes; the limiting step is provided with limiting screw holes corresponding to the positions of the limiting countersunk holes; a limiting screw passes through the limiting countersunk hole and is screwed into the limiting screw hole corresponding thereto.

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