A turning correction fixture for thin-walled tubular parts

Abstract

The utility model discloses a kind of turning correction clamps of thin-walled pipe class parts, including dynamic extrusion device and the inner expansion portion of circumferential around being arranged in extrusion part around, the dynamic extrusion device includes pull rod, extrusion block, universal joint part, driving part, the first end of the pull rod is connected with the driving end of driving part by universal joint part, the second end of the pull rod is coaxially connected with extrusion block, extrusion bevel is provided on the extrusion block, the inner expansion portion is provided with the pressure receiving bevel matched with extrusion bevel;The utility model can be self-adapting to the end of tubular part and carry out centring inner expansion clamping fixation, and then guarantee the machining precision of subsequent turning of pipe class parts.

Description

Technical Field

[0001] This utility model belongs to the technical field of turning fixtures for tubular parts, specifically relating to a turning and correction fixture for thin-walled tubular parts. Background Technology

[0002] Ultra-long, thin-walled tubular parts have wide applications in aerospace and other fields, serving as key components in aerospace systems. These parts are typically made of materials such as stainless steel, titanium alloys, and high-temperature alloys. Due to the high strength and weight requirements of aerospace applications, they are generally designed as thin-walled components. Conventional turning clamping methods involve one clamp and one support, with the part supported in the middle by a center rest. However, thin-walled parts made of materials such as stainless steel, titanium alloys, and high-temperature alloys are prone to deformation and difficult to machine. In existing technologies, when thin-walled tubular parts are directly externally clamped, they are easily deformed under the external clamping force and turning heat. Furthermore, existing external clamping fixtures cannot adjust the axial position of the tubular part after clamping, resulting in a coaxial error between the axis of the tubular part and the axis of the lathe, which in turn affects the final machining accuracy of the tubular part.

[0003] Therefore, in view of the shortcomings of the existing technology in the clamping process of thin-walled tubular parts, this utility model discloses a turning and straightening fixture for thin-walled tubular parts. Utility Model Content

[0004] This utility model discloses a turning correction fixture for thin-walled tubular parts, which can adaptively center and internally expand the end of the tubular parts for clamping and fixing, thereby ensuring the machining accuracy of the tubular parts in subsequent turning.

[0005] This utility model is achieved through the following technical solution: A turning and straightening fixture for thin-walled tubular parts includes a dynamic extrusion device and an inner expansion portion circumferentially surrounding the extrusion portion. The dynamic extrusion device includes a pull rod, an extrusion block, a universal joint, and a driving component. The first end of the pull rod is connected to the driving end of the driving component through the universal joint, and the second end of the pull rod is coaxially connected to the extrusion block. An extrusion inclined surface is provided on the extrusion block, and a pressure-receiving inclined surface that cooperates with the extrusion inclined surface is provided on the inner expansion portion.

[0006] To better realize this utility model, a floating support is further provided on the outside of the pull rod.

[0007] To better realize this utility model, the floating support component further includes an outer support ring, an inner floating ring, and elastic elements. The outer support ring is coaxially disposed inside the central hole of the mounting ring. An inner floating ring is disposed inside the outer support ring. The inner ring surface of the inner floating ring cooperates with the tie rod. Several elastic elements are evenly distributed circumferentially between the outer ring surface of the inner floating ring and the inner ring surface of the outer support ring.

[0008] To better realize this utility model, the universal joint further includes a first universal joint, a second universal joint, and a connecting rod. The first end of the connecting rod is connected to the first end of the pull rod through the first universal joint, and the second end of the connecting rod is connected to the driving end of the driving member through the second universal joint.

[0009] To better realize this utility model, the inner expansion part further includes a mounting ring and an inner expansion wedge. A floating support is provided inside the central hole of the mounting ring. Several inner expansion wedges are evenly distributed circumferentially on the outer ring surface of the mounting ring. The inner expansion wedges can slide radially through the center of the mounting ring. A pressure-bearing inclined surface is provided on the inner sidewall of the inner expansion wedge.

[0010] To better realize this utility model, furthermore, at least three sets of radial sliding grooves are evenly distributed along the circumference on the end face of the mounting ring, and one side of the inner expansion wedge block is slidably connected with the radial sliding groove.

[0011] To better realize this utility model, the mounting ring is further provided with a connecting sleeve, and one end of the connecting sleeve is provided with a connecting flange.

[0012] To better realize this utility model, the driving component further includes a driving cylinder, and the end of the telescopic rod of the driving cylinder is connected to the end of the pull rod through a universal joint.

[0013] Compared with the prior art, this utility model has the following advantages and beneficial effects: This invention uses a dynamic extrusion device to compress the inner expansion section, which in turn expands and tightens the inner wall of the tubular part. At the same time, the dynamic extrusion device can adaptively float and adjust under the action of extrusion reaction force, so that the axis of the dynamic extrusion device is coaxial with the axis of the tubular part, ensuring the stability and positioning accuracy of the tubular part during the turning process, thereby ensuring the accuracy of subsequent turning of the tubular part. Attached Figure Description

[0014] Figure 1 This is a sectional view of the turning correction fixture; Figure 2 This is a structural schematic diagram of the universal joint. Figure 3 for Figure 1 A magnified view of section B; Figure 4 This is a schematic diagram of the installation of the internal expansion wedge block on the end face of the mounting ring.

[0015] Wherein: A1-Pull rod; A2-Extrusion block; A3-Universal connector; A4-Floating support; A5-Drive component; A6-Mounting ring; A7-Inner expansion wedge block; A8-Connecting sleeve; A31-First universal joint; A32-Second universal joint; A33-Connecting rod; A41-Outer support ring; A42-Inner floating ring; A43-Elastic component; A100-Extrusion slope; A200-Pressure slope. Detailed Implementation

[0016] Example 1: This embodiment provides a turning and straightening fixture for thin-walled tubular parts, such as... Figure 1 and Figure 2 As shown, it includes a dynamic extrusion device and an inner expansion part circumferentially surrounding the extrusion part. The dynamic extrusion device includes a pull rod A1, an extrusion block A2, a universal connector A3, and a driving member A5. The first end of the pull rod A1 is connected to the driving end of the driving member A5 through the universal connector A3. The second end of the pull rod A1 is coaxially connected to the extrusion block A2. The extrusion block A2 is provided with an extrusion inclined surface A100. The inner expansion part is provided with a pressure-receiving inclined surface A200 that cooperates with the extrusion inclined surface A100.

[0017] The driving component A5 is connected to the first end of the pull rod A1 via the universal joint A3, and the axis of the driving cylinder is set parallel to the axis of the dynamic extrusion device. The driving component A5 drives the pull rod A1 to move, which in turn causes the extrusion ramp A100 on the extrusion block A2 to extrude the pressure ramp A200 on the inner expansion section. Under the extrusion force, the inner expansion section expands to tightly press the inner wall of the pipe end. Simultaneously, the extrusion block A2 and the pull rod A1 move in a plane perpendicular to the axis of the dynamic extrusion device under the extrusion reaction force, and with the cooperation of the extrusion ramp A100 and the pressure ramp A200, the axis of the dynamic extrusion device ultimately becomes coaxial with the axis of the pipe.

[0018] Example 2: This embodiment discloses a turning and straightening fixture for thin-walled tubular parts, which is an improvement on Embodiment 1, such as... Figure 1 As shown, a floating support A4 is fitted onto the outside of the pull rod A1. During the floating process of the pull rod A1, the floating support A4 provides floating support for the pull rod A1, ensuring the stability of the pull rod A1's floating motion.

[0019] Furthermore, such as Figure 3As shown, the floating support A4 includes an outer support ring A41, an inner floating ring A42, and elastic elements A43. The outer support ring A41 is coaxially disposed inside the central hole of the mounting ring A6. The inner floating ring A42 is disposed inside the outer support ring A41. The inner ring surface of the inner floating ring A42 cooperates with the pull rod A1. A plurality of elastic elements A43 are evenly distributed circumferentially between the outer ring surface of the inner floating ring A42 and the inner ring surface of the outer support ring A41.

[0020] When the tie rod A1 floats, it causes the inner floating ring A42 to float relative to the outer support ring A41. At the same time, the elastic element A43 undergoes elastic deformation under compression or tension, ensuring the stability of the inner floating ring A42 as it floats with the tie rod A1. By setting the floating support element A4, it is possible to ensure that the tie rod A1 floats smoothly to a position where its axis is coaxial with the axis of the tubular part.

[0021] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0022] Example 3: This embodiment discloses a turning and straightening fixture for thin-walled tubular parts, which is an improvement on embodiment 1 or 2, such as... Figure 2 As shown, the universal joint A3 includes a first universal joint A31, a second universal joint A32, and a connecting rod A33. The first end of the connecting rod A33 is connected to the first end of the pull rod A1 through the first universal joint A31, and the second end of the connecting rod A33 is connected to the driving end of the driving member A5 through the second universal joint A32.

[0023] When the drive component A5 extends or retracts, it drives the universal joint A3 to drive the pull rod A1 to float in a plane perpendicular to the axis of the tubular part. By setting the first universal joint A31 and the second universal joint A32 at both ends of the connecting rod A33, it can be ensured that the pull rod A1 can drive the extrusion block A2 to move axially while also floating in a plane perpendicular to the axis of the tubular part.

[0024] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again.

[0025] Example 4: This embodiment discloses a turning and straightening fixture for thin-walled tubular parts, which is an improvement on any one of embodiments 1-3, such as... Figure 1 and Figure 4 As shown, the inner expansion part includes a mounting ring A6 and an inner expansion wedge block A7. A floating support A4 is provided inside the central hole of the mounting ring A6. Several inner expansion wedge blocks A7 are evenly distributed circumferentially on the outer ring surface of the mounting ring A6. The inner expansion wedge block A7 can slide radially through the center of the mounting ring A6. A pressure-bearing inclined surface A200 is provided on the inner sidewall of the inner expansion wedge block A7.

[0026] Several radial grooves passing through the center of the mounting ring A6 are evenly distributed circumferentially on the outer ring surface of the mounting ring A6. One end of the inner expansion wedge block A7 is slidably connected to the radial groove, ensuring that the inner expansion wedge block A7 can slide radially relative to the mounting ring A6. The inner wall of the other end of the inner expansion wedge block A7 is provided with a pressure-bearing inclined surface A200. When the pull rod A1 pulls the extrusion block A2, the extrusion inclined surface A100 on the extrusion block A2 contacts the pressure-bearing inclined surface A200 and compresses it, causing the inner expansion wedge block A7 to slide and expand along the radial groove, ultimately achieving the inner expansion wedge block A7 to expand and tighten the inner wall of the pipe part's port.

[0027] Furthermore, at least three sets of radial grooves are evenly distributed circumferentially on the end face of the mounting ring A6, and one side of the inner expansion wedge block A7 is slidably connected to the radial grooves.

[0028] Furthermore, a connecting sleeve A8 is fitted around the outside of the mounting ring A6, and a connecting flange is provided at one end of the connecting sleeve A8. The connecting flange is used to connect with the machine tool base to fix the fixture.

[0029] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.

[0030] Example 5: This embodiment discloses a turning and straightening fixture for thin-walled tubular parts, which is an improvement on any one of embodiments 1-4. The driving component A5 includes a driving cylinder, and the end of the telescopic rod of the driving cylinder is connected to the end of the pull rod A1 through a universal joint A3.

[0031] The drive cylinder is located in the inner cavity of the mounting ring A6. The end of the extension rod of the drive cylinder is hinged with a connecting lug, which is connected to one end of the universal joint A3 to drive the pull rod A1 to move.

[0032] The rest of this embodiment is the same as any one of embodiments 1-4, so it will not be described again.

[0033] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present utility model shall fall within the protection scope of the present utility model.

Claims

1. A turning and straightening fixture for thin-walled tubular parts, comprising a dynamic extrusion device and an inner expansion portion circumferentially surrounding the extrusion section, characterized in that, The dynamic extrusion device includes a pull rod (A1), an extrusion block (A2), a universal connector (A3), and a drive component (A5). The first end of the pull rod (A1) is connected to the drive end of the drive component (A5) through the universal connector (A3). The second end of the pull rod (A1) is coaxially connected to the extrusion block (A2). The extrusion block (A2) is provided with an extrusion inclined surface (A100), and the inner expansion part is provided with a pressure-receiving inclined surface (A200) that cooperates with the extrusion inclined surface (A100).

2. The turning and straightening fixture for thin-walled tubular parts according to claim 1, characterized in that, The tie rod (A1) is externally fitted with a floating support (A4).

3. The turning and straightening fixture for thin-walled tubular parts according to claim 2, characterized in that, The floating support (A4) includes an outer support ring (A41), an inner floating ring (A42), and elastic elements (A43). The outer support ring (A41) is coaxially disposed inside the central hole of the mounting ring (A6). The inner floating ring (A42) is disposed inside the outer support ring (A41). The inner ring surface of the inner floating ring (A42) cooperates with the tie rod (A1). A number of elastic elements (A43) are evenly distributed circumferentially between the outer ring surface of the inner floating ring (A42) and the inner ring surface of the outer support ring (A41).

4. The turning and straightening fixture for thin-walled tubular parts according to claim 3, characterized in that, The universal joint (A3) includes a first universal joint (A31), a second universal joint (A32), and a connecting rod (A33). The first end of the connecting rod (A33) is connected to the first end of the pull rod (A1) through the first universal joint (A31), and the second end of the connecting rod (A33) is connected to the driving end of the driving member (A5) through the second universal joint (A32).

5. A turning and straightening fixture for thin-walled tubular parts according to any one of claims 2-4, characterized in that, The inner expansion part includes a mounting ring (A6) and an inner expansion wedge (A7). A floating support (A4) is provided inside the central hole of the mounting ring (A6). Several inner expansion wedges (A7) are evenly distributed circumferentially on the outer ring surface of the mounting ring (A6). The inner expansion wedges (A7) can slide radially through the center of the mounting ring (A6). A pressure-bearing inclined surface (A200) is provided on the inner sidewall of the inner expansion wedge (A7).

6. The turning and straightening fixture for thin-walled tubular parts according to claim 5, characterized in that, At least three sets of radial grooves are evenly distributed circumferentially on the end face of the mounting ring (A6), and one side of the inner expansion wedge block (A7) is slidably connected to the radial grooves.

7. A turning and straightening fixture for thin-walled tubular parts according to claim 6, characterized in that, The mounting ring (A6) is fitted with a connecting sleeve (A8), and one end of the connecting sleeve (A8) is provided with a connecting flange.

8. A turning and straightening fixture for thin-walled tubular parts according to any one of claims 1-4, characterized in that, The drive component (A5) includes a drive cylinder, the end of which is connected to the end of the pull rod (A1) via a universal joint (A3).

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