Precise thin-wall part inner support clamping fixture

Abstract

The utility model discloses an inner support clamping fixture for a precise thin-wall part, relates to the technical field of clamping fixtures, and solves the problem of low clamping reliability in the prior art. The clamping device comprises a clamping base body, the clamping base body is connected with one end of a pull rod assembly, a tight supporting assembly is arranged outside the pull rod assembly, a locking structure is arranged at the other end of the pull rod assembly, and the precise thin-wall part is arranged on the outer side of the tight supporting assembly. The locking structure is used for axially positioning the precise thin-wall part and can adjust the deformation of the tight supporting assembly to fix the precise thin-wall part in a tight supporting mode. By arranging the clamping base body, a clamping foundation connected with a lathe chuck can be provided for the clamp, by arranging the pull rod assembly, a connection supporting foundation is provided, deformation of the tight supporting assembly is adjusted through the locking structure, supporting force is provided for an inner hole of the precise thin-wall part, and the acting force generated by the tight supporting assembly is evenly transmitted to the inner hole of the precise thin-wall part; and the shape and position sizes such as the inner hole size and the hole cylindricity of the thin-wall workpiece are prevented from changing. And meanwhile, the clamp is convenient to connect and disassemble and good in clamping reliability.

Description

TECHNICAL FIELD

[0001] The utility model relates to clamping fixture technical field, especially point to a kind of precision thin-walled part inner support clamping fixture. BACKGROUND

[0002] In the field of machining, the machining of titanium, aluminum alloy thin-walled pipe fittings is very common, in order to make the thin-walled pipe fittings better cooperate with other parts in the equipment, the outer circle of the thin-walled pipe fittings usually needs to be machined. When the lathe is machining the thin-walled pipe fittings, it is sometimes unable to clamp firmly due to the limitation of the size of the clamping jaw, at the same time, due to the poor rigidity of the thin-walled pipe fittings, the parts are easily deformed during clamping, in addition, during the high-speed rotating cutting process, cutting force, cutting heat and cutting vibration, etc. are more likely to cause deformation of the parts, thereby reducing the machining precision and machining quality of the thin-walled pipe fittings.

[0003] The usual solution is to use a tooling fixture to solve the clamping problem in machining, such tooling fixtures in the prior art, such as the Chinese invention patent with publication number CN108788856A, discloses a clamping fixture for turning thin-walled pipe fittings, which comprises a four-jaw chuck, a fixed block arranged in the four-jaw chuck, a fixed shaft arranged on the fixed block and distributed axially along the fixed block, and a tightening device arranged radially on the fixed shaft, the tightening device comprises a tightening cylinder coaxial with the fixed shaft and having a diameter greater than that of the fixed shaft, and a compression spring connecting the inner wall of the tightening cylinder and the outer wall of the fixed shaft, the fixed block is a cube, and the axial center line of the fixed block coincides with the axial center line of the fixed shaft and the axial center line of the four-jaw chuck. The present application can better and more conveniently tighten the thin-walled pipe fittings through the arrangement of the tightening device. At the same time, since the fixed shaft for connecting the tightening device is connected with the fixed block of the cube, and the fixed block is fixed by the four-jaw chuck, the radial and axial directions of the thin-walled pipe fittings can be subjected to the tightening force, thereby improving the machining precision.

[0004] In this scheme, the clamping and fixing of the thin-walled pipe fittings are realized by the tightening of the compression spring, the elastic force of the compression spring cannot be set too high, otherwise it will be not conducive to clamping, and the high elastic force will cause the deformation of the clamped workpiece. The force generated during turning machining is large, while the clamping force maintained by the compression spring is limited, so the reliability of clamping is low. UTILITY MODEL CONTENTS

[0005] In view of the deficiencies in the above background art, the utility model provides a precision thin-walled part inner support clamping fixture, which solves the problem of low clamping reliability in the prior art.

[0006] The utility model discloses a technical scheme is as follows: a kind of precision thin-walled part inside bracing clamping fixture, including clamping base body, the clamping base body is connected with the one end of pull rod assembly, pull rod assembly is equipped with bracing assembly outside, the other end of pull rod assembly is equipped with locking structure, precision thin-walled part is arranged outside bracing assembly, locking structure is used to carry out axial positioning to precision thin-walled part and can adjust bracing assembly deformation to form fixed precision thin-walled part in bracing mode.

[0007] Preferably, the axis of the end face of the clamping base body is provided with a first threaded hole, and a plurality of second threaded holes are provided outside the first threaded hole.

[0008] Preferably, the pull rod assembly includes a main positioning rod connected to the first threaded hole at one end, and each of the second threaded holes is connected to an auxiliary positioning rod.

[0009] Preferably, the bracing assembly includes a plurality of bracing pressure plates and auxiliary gaskets coaxially and alternately arranged on the main positioning rod, each of the bracing pressure plates and the auxiliary gaskets is provided with a through hole and is in sliding cooperation with the auxiliary positioning rod through the through hole, a clasp spring is provided outside the auxiliary gasket, and the locking structure can extrude the bracing pressure plate and the auxiliary gasket to expand the clasp spring outward.

[0010] Preferably, the diameter of the clasp spring is greater than the thickness of the auxiliary gasket, the clasp spring is provided with an opening, and the bracing pressure plate is provided with a chamfer for extruding the clasp spring.

[0011] Preferably, the outside of the clasp spring is provided with a bracing sleeve, and the bracing sleeve is arranged inside the precision thin-walled part. The side wall of the bracing sleeve is provided with a through opening. The bracing sleeve is a polytetrafluoroethylene sleeve.

[0012] Preferably, the locking structure includes a compression nut arranged outside the main positioning rod, a compression bolt connected to the end of the main positioning rod and cooperating with the outer end face of the compression nut, the compression nut cooperates with the end face of the bracing pressure plate located outside, and a gap is left between the end face of the compression nut and the end face of the auxiliary positioning rod.

[0013] Preferably, an axial positioning auxiliary plate is threadedly connected to the outside of the compression nut, the inside of the axial positioning auxiliary plate cooperates with the outer end face of the precision thin-walled part, and the inner end face of the precision thin-walled part cooperates with the clamping base body to realize axial positioning and clamping.

[0014] The utility model has the advantages that the clamping base body can provide a clamping basis connected with the chuck of a lathe, the pull rod assembly provides a connection support basis, the locking structure adjusts the deformation of the bracing assembly to provide bracing force for the inner hole of the precision thin-walled part, the force generated by the bracing assembly is uniformly transmitted to the inner hole of the precision thin-walled part, the shape and position dimensions of the inner hole of the thin-walled workpiece, such as hole cylindricality, are prevented from changing, the clamping force can be continuously maintained, the reliability is higher, the connection and disconnection are convenient, and the adjustability is good. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present application, the drawings needed in the following embodiment description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 It is a sectional structure schematic view of the present application.

[0017] Figure 2 It is a sectional structure schematic view of the present application.

[0018] Figure 3 It is an explosion structure schematic view of the present application.

[0019] Figure 4 It is a partial bracing assembly structure schematic view of the present application.

[0020] Figure 5 It is a sectional structure schematic view of the present application. Figure 4

[0021] Figure 6 It is a bracing sleeve structure schematic view of the present application.

[0022] In the figure: 1: clamping base body, 2: pull rod assembly, 3: bracing assembly, 4: locking structure, 5: precision thin-walled part, 6: main positioning rod, 7: auxiliary positioning rod, 8: bracing pressure plate, 9: auxiliary gasket, 10: clasp, 11: bracing sleeve, 12: through-body opening, 13: compression nut, 14: compression bolt, 15: axial positioning auxiliary plate. DETAILED DESCRIPTION

[0023] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0024] As Figure 1 , 2 ​As shown in Fig. 3 of the embodiment 1, the clamp for supporting and clamping the thin-walled precision part comprises a clamping base 1, which provides a clamping basis for connecting with the chuck of a lathe. The clamping base 1 is connected with one end of a pull rod assembly 2, which provides a connecting support basis. The pull rod assembly 2 is externally provided with a supporting assembly 3. The other end of the pull rod assembly 2 is provided with a locking structure 4. The thin-walled precision part 5 is arranged outside the supporting assembly 3. The locking structure 4 is used for axially positioning the thin-walled precision part 5 and adjusting the deformation of the supporting assembly 3 to form a fixation to the thin-walled precision part 5 in a supporting manner. In this embodiment, the deformation of the supporting assembly is adjusted by the locking structure to provide a supporting force to the inner hole of the thin-walled precision part, so that the force generated by the supporting assembly is uniformly transmitted to the inner hole of the thin-walled precision part, preventing the change of the shape and position dimensions such as the inner hole size and the hole cylindricity of the thin-walled workpiece, thereby continuously maintaining the clamping force and improving the reliability. Meanwhile, the connection and disconnection are convenient, and the adjustability is good.

[0025] As a further specific embodiment, the first threaded hole is arranged at the axis of the end surface of the clamping base 1. A plurality of second threaded holes are arranged outside the first threaded hole. Correspondingly, the pull rod assembly 2 comprises a main positioning rod 6 connected with the first threaded hole at one end. The second threaded holes are all connected with auxiliary positioning rods 7. In this embodiment, three second threaded holes are arranged, which are evenly distributed at equal intervals around the first threaded hole. Three auxiliary positioning rods 7 are correspondingly arranged. The main positioning rod and the auxiliary positioning rod are both cylindrical rods, and the diameter of the main positioning rod is greater than that of the auxiliary positioning rod, so that more stable structural support is provided by the main positioning rod.

[0026] In use, the pull rod assembly is first arranged on the clamping base, then the supporting assembly is arranged on the pull rod assembly to form a preliminary assembly, then the thin-walled precision part 5 is sleeved outside the supporting assembly, and the locking structure is used for axially clamping and positioning the thin-walled assembly, while the locking structure is used for extruding the supporting assembly, so that the supporting assembly is deformed to form a supporting fixation to the thin-walled precision part. Finally, the clamping base is clamped and fixed on the three-jaw self-centering chuck of the lathe for machining. After machining, the locking structure is removed, and the clamping and machining of the subsequent thin-walled precision part are carried out. The set of clamps can be designed as a "group clamp" according to the type of product to facilitate use, ensure product quality, and improve production efficiency.

[0027] Embodiment 2, as shown in Fig. 4 of the embodiment 2, the clamp for supporting and clamping the thin-walled precision part comprises a clamping base 1, which provides a clamping basis for connecting with the chuck of a lathe. The clamping base 1 is connected with one end of a pull rod assembly 2, which provides a connecting support basis. The pull rod assembly 2 is externally provided with a supporting assembly 3. The other end of the pull rod assembly 2 is provided with a locking structure 4. The thin-walled precision part 5 is arranged outside the supporting assembly 3. The locking structure 4 is used for axially positioning the thin-walled precision part 5 and adjusting the deformation of the supporting assembly 3 to form a fixation to the thin-walled precision part 5 in a supporting manner. In this embodiment, the deformation of the supporting assembly is adjusted by the locking structure to provide a supporting force to the inner hole of the thin-walled precision part, so that the force generated by the supporting assembly is uniformly transmitted to the inner hole of the thin-walled precision part, preventing the change of the shape and position dimensions such as the inner hole size and the hole cylindricity of the thin-walled workpiece, thereby continuously maintaining the clamping force and improving the reliability. Meanwhile, the connection and disconnection are convenient, and the adjustability is good. Figure 1 、 3, 4, 5, a precise thin-walled part inside support clamping fixture, based on the embodiment 1, the support assembly 3 includes a number of alternating set on the main positioning rod 6 support pressure sheet 8 and auxiliary gasket 9, support pressure sheet 8 and auxiliary gasket 9 in the middle are provided with central hole, and through the central hole with the main positioning rod 6 coaxial sliding fit, support pressure sheet 8 and auxiliary gasket 9 central hole outside are provided with through hole, and are all through the through hole and auxiliary positioning rod 7 sliding fit, in this embodiment, the through hole is provided with three, support pressure sheet 8 and auxiliary gasket 9 are through three through holes and three auxiliary positioning rod sliding fit, auxiliary positioning rod plays the role of limiting and sliding guide to support pressure sheet 8 and auxiliary gasket 9.

[0028] In addition, the auxiliary gasket 9 is provided with a circlip 10, and the locking structure 4 can extrude the support pressure sheet 8 and the auxiliary gasket 9 to make the circlip 10 expand outward. Specifically, the diameter of the circlip 10 is greater than the thickness of the auxiliary gasket 9, the circlip 10 is provided with an opening, and the support pressure sheet 8 is provided with a chamfer for extruding the circlip 10. In this embodiment, during the extrusion and compression of the support pressure sheet and the auxiliary gasket by the locking structure, the distance between the adjacent support pressure sheets is shortened, so that the chamfers on the opposite surfaces extrude the circlip from both sides respectively, thereby promoting the outward expansion of the circlip. The plurality of support pressure sheets are subjected to common force, thereby promoting the synchronous outward expansion of the plurality of circlips. As an optional solution, the auxiliary gasket is made of rubber material, and the support pressure sheet is made of metal material.

[0029] As a further embodiment, as shown in Figure 6 A support sleeve 11 is provided outside the circlip 10, and the support sleeve 11 is arranged inside the precise thin-walled part 5. The support sleeve is arranged to balance the support force and avoid deformation of the workpiece. In addition, the side wall of the support sleeve 11 is provided with a through opening 12, so that the support sleeve can be expanded. With the synchronous outward expansion of the plurality of circlips, the support sleeve 11 is pushed to expand outward synchronously, the through opening 12 becomes larger, and the overall diameter of the support sleeve expands, thereby supporting the inner hole of the precise thin-walled part. In this embodiment, the support sleeve 11 is a polytetrafluoroethylene sleeve. The polytetrafluoroethylene material is used to form a cushion layer, which can well prevent the inner hole of the precise thin-walled part 5 from being scratched, and make the installation and disassembly more convenient.

[0030] Embodiment 3, a precise thin-walled part inside support clamping fixture, based on the embodiment 2, the locking structure 4 includes a compression nut 13 arranged outside the main positioning rod 6, the end of the main positioning rod 6 is connected with a compression bolt 14 matched with the outer end surface of the compression nut 13, the compression nut 13 is matched with the end surface of the support pressure sheet 8 located at the outer end, and a gap is left between the compression nut 13 and the end surface of the auxiliary positioning rod 7, thereby providing space for the compression nut to move during the pressure exertion on the support pressure sheet. At the same time, the gap should be avoided to be too large during actual use, which affects the support of the outermost support pressure sheet.

[0031] In the embodiment, the main positioning rod 6 is provided with external threads at one end and is screwed with the first threaded hole, and the other end of the main positioning rod 6 is provided with a threaded hole and is connected with the compression bolt 14; when clamping, the compression bolt is used to compress the compression nut 13, and then the clamping spring and the auxiliary gasket are extruded, so that the clamping spring is expanded outward.

[0032] As a further embodiment, the compression nut 13 is provided with external threads on the outer side, and an axial positioning auxiliary plate 15 is connected through the external threads; the axial positioning auxiliary plate is a circular ring-shaped baffle; the inner side wall of the axial positioning auxiliary plate 15 is matched with the outer end surface of the precision thin-walled part 5, and the inner end surface of the precision thin-walled part 5 is matched with the clamping base body 1, so as to realize the axial positioning and clamping of the precision thin-walled part.

[0033] The above only describes the preferred embodiment of the utility model, and is not used to limit the utility model, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the utility model should be included in the protection scope of the utility model.

Claims

1. A clamping fixture for internal support of precision thin-walled parts, comprising a clamping base (1), characterized in that: The clamping base (1) is connected to one end of the pull rod assembly (2), a tensioning assembly (3) is provided outside the pull rod assembly (2), and a locking structure (4) is provided at the other end of the pull rod assembly (2). The precision thin-walled part (5) is arranged outside the tensioning assembly (3), and the locking structure (4) is used to axially position the precision thin-walled part (5) and can adjust the deformation of the tensioning assembly (3) to fix the precision thin-walled part (5) in a tensioning manner; a first threaded hole is provided at the axis of the end face of the clamping base (1), and a plurality of second threaded holes are provided outside the first threaded hole; the pull rod assembly (2) includes a main positioning rod (6) connected to the first threaded hole at one end, and the second threaded holes are connected to auxiliary positioning rods (7); the tensioning assembly (3) includes a plurality of coaxial and alternately sliding rods provided on the main positioning rod ( 6), the supporting pressure piece (8) and the auxiliary gasket (9) are both provided with through holes and are slidably matched with the auxiliary positioning rod (7) through the through holes, the auxiliary gasket (9) is provided with a retaining spring (10) on its outer sleeve, and the locking structure (4) can squeeze the supporting pressure piece (8) and the auxiliary gasket (9) to expand the retaining spring (10); the diameter of the retaining spring (10) is greater than the thickness of the auxiliary gasket (9), the retaining spring (10) is provided with an opening, and the supporting pressure piece (8) is provided with a chamfer for squeezing the retaining spring (10); the outer side of the retaining spring (10) is provided with a supporting sleeve (11), and the supporting sleeve (11) is provided on the inner side of the precision thin-walled part (5); the side wall of the supporting sleeve (11) is provided with a through-body notch (12); the supporting sleeve (11) is a polytetrafluoroethylene sleeve.

2. The internal support clamping fixture for precision thin-walled parts according to claim 1 is characterized in that: The locking structure (4) includes a clamping nut (13) sleeved on the outside of the main positioning rod (6), and the end of the main positioning rod (6) is connected to a clamping bolt (14) that cooperates with the outer end face of the clamping nut (13). The clamping nut (13) cooperates with the end face of the supporting pressure piece (8) located at the outer end, and a gap is left between the clamping nut (13) and the end face of the auxiliary positioning rod (7).

3. The internal support clamping fixture for precision thin-walled parts according to claim 2 is characterized in that: The outer side of the clamping nut (13) is threadedly connected to an axial positioning auxiliary plate (15), the inner side of the axial positioning auxiliary plate (15) cooperates with the outer end surface of the precision thin-walled part (5), and the inner end surface of the precision thin-walled part (5) cooperates with the clamping base (1) to achieve axial positioning and clamping.

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