A turning correction device and correction method for thin-walled tubular parts

Abstract

This invention discloses a turning correction device and method for thin-walled tubular parts. A dynamic extrusion device compresses an inner expansion portion, which in turn expands and tightens the inner wall of the tubular part. Simultaneously, the dynamic extrusion device can adaptively float and adjust under the extrusion reaction force, ensuring that the axis of the dynamic extrusion device is coaxial with the axis of the tubular part. Then, a dynamic external clamping device floats and adjusts according to the positional difference between its own axis and the axis of the dynamic extrusion device, ensuring that the external clamping device clamps the outer wall of the tubular part while maintaining coaxiality with the axis of the tubular part. This ensures synchronous clamping of the inner and outer sides of the tubular part's end, effectively guaranteeing the stability of the tubular part during turning and ensuring coaxiality between the clamped tubular part and the lathe axis, thereby guaranteeing the subsequent turning accuracy of the tubular part.

Description

Technical Field

[0001] This invention belongs to the technical field of machining fixtures for pipe parts, specifically relating to a machining correction device and correction method for thin-walled pipe 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, the present invention discloses a turning correction device and correction method for thin-walled tubular parts. Summary of the Invention

[0004] This invention discloses a turning correction device and correction method for thin-walled tubular parts, which can adaptively perform centering internal expansion and centering external pressure clamping on the end of the tubular parts, and adjust the tubular parts to a machining position where the axis is coaxial with the lathe axis, thereby ensuring the machining accuracy of the tubular parts in subsequent turning.

[0005] This invention is achieved through the following technical solution:

[0006] A turning and straightening device for thin-walled tubular parts, comprising:

[0007] A dynamic internal expansion centering device includes a dynamic extrusion device and an internal expansion part circumferentially surrounding the extrusion part. The dynamic extrusion device can automatically adjust to a position concentric with the tubular part under the action of extrusion reaction force during the extrusion of the internal expansion part. The internal expansion part can internally expand and fix the tubular part under the extrusion action of the dynamic extrusion device.

[0008] A floating support device, which can move with the dynamic extrusion device to provide floating support for the outer wall of the tubular part;

[0009] A concentricity detection device, which is used to detect and calibrate the axial position of a dynamic extrusion device;

[0010] A dynamic external clamping device, which can dynamically adjust to a position coaxial with the tubular part and clamp the external part based on the positional difference between its own axis position and the axis position of the dynamic extrusion device.

[0011] An overall displacement device, which, based on the positional difference between the axis of the dynamic extrusion device and the axis of the lathe, drives the dynamic internal expansion centering device and the dynamic external clamping device to move in a plane perpendicular to the axis of the lathe, so that the axis of the tubular part is coaxial with the axis of the lathe.

[0012] To better realize the present invention, the dynamic extrusion device further includes a pull rod, an extrusion block, a universal connector, a floating support, and a driving component. The first end of the pull rod is connected to the driving end of the driving component through the universal connector. The second end of the pull rod is coaxially connected to the extrusion block. The floating support is fitted around the pull rod and can support the pull rod while moving with it. The extrusion block is provided with an extrusion ramp, and the inner expansion part is provided with a pressure ramp that cooperates with the extrusion ramp.

[0013] To better realize the present invention, 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.

[0014] To better realize the present invention, the floating support 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. A plurality of 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.

[0015] To better realize the present invention, 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.

[0016] To better realize the present invention, the dynamic external clamping device further includes a horizontal moving device, a vertical moving device, a clamp mounting frame, and an external conforming clamp. The horizontal moving end of the horizontal moving device is provided with a vertical moving device, and the vertical moving end of the vertical moving device is provided with a clamp mounting frame. The clamp mounting frame is provided with an external conforming clamp corresponding to the outer wall of the tubular part.

[0017] To better realize the present invention, the floating support device further includes a lifting device and a conformal support member. The lifting end of the lifting device is provided with a conformal support member, and the top of the conformal support member is provided with a conformal support groove.

[0018] To better realize the present invention, further, a plurality of balls are evenly distributed on the inner groove surface of the conformal support groove.

[0019] A method for machining correction of thin-walled tubular parts, based on a machining correction device, includes the following steps:

[0020] Step 1: Install the dynamic extrusion device and the inner expansion part into the port of the tubular part. The dynamic extrusion device extrudes the inner expansion part, and the inner expansion part expands and fixes the inner wall of the port of the tubular part. At the same time, the dynamic extrusion device automatically adjusts to a position concentric with the tubular part under the action of the extrusion reaction force.

[0021] Step 2: After the internal expansion and fixing of the pipe parts is completed, the axial position of the dynamic extrusion device is detected by the concentricity detection device. The floating support device moves up and down based on the axial position of the dynamic extrusion device to assist in supporting the exterior of the pipe parts.

[0022] Step 3: The dynamic external clamping device calculates the first position difference between its own axis position and the axis position of the dynamic extrusion device, and moves to a position where its own axis is coaxial with the axis of the dynamic extrusion device according to the first position difference;

[0023] Step 4: Clamp and fix the tubular parts externally using a dynamic external clamping device;

[0024] Step 5: Calculate the second position difference between the axis of the dynamic extrusion device and the axis of the lathe. Based on the second position difference, the overall displacement device drives the dynamic internal expansion centering device and the dynamic external clamping device to move in a plane perpendicular to the axis of the lathe until the axis of the tubular part is coaxial with the axis of the lathe.

[0025] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0026] (1) The present invention uses a dynamic extrusion device to extrude the inner expansion part, and the inner expansion part is used to expand and tighten 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. Then, the dynamic external clamping device floats and adjusts according to the position difference between its own axis and the axis of the dynamic extrusion device, so as to ensure that the dynamic external clamping device clamps the outer wall of the tubular part while ensuring that its own axis is coaxial with the axis of the tubular part, thereby ensuring the synchronous clamping of the inner and outer sides of the end of the tubular part, effectively ensuring the stability of the tubular part during the turning process.

[0027] (2) The present invention applies an outward internal expansion force to the inner wall of the end of the tubular part through a dynamic internal expansion centering device, which balances the inward internal pressure applied to the outer wall of the end of the tubular part by a dynamic external clamping device, thus effectively preventing the tubular part from deforming.

[0028] (3) After the end of the tubular part is completely positioned and fixed, the present invention drives the tubular part to move in a plane perpendicular to the lathe axis through the overall displacement device, so that the axis of the tubular part is finally coaxial with the lathe axis, thereby ensuring the turning accuracy of the tubular part. Attached Figure Description

[0029] Figure 1 This is a schematic diagram of the turning correction device;

[0030] Figure 2 This is a schematic diagram of the dynamic internal expansion centering device;

[0031] Figure 3 This is a structural schematic diagram of the universal joint.

[0032] Figure 4 for Figure 2 A magnified view of section B;

[0033] Figure 5 This is a schematic diagram of the dynamic external clamping device.

[0034] Figure 6 This is a schematic diagram of the installation of the dynamic external clamping device;

[0035] Figure 7 for Figure 5 CC-direction sectional view.

[0036] Wherein: 1-Dynamic internal expansion centering device; 2-Floating support device; 3-Dynamic external clamping device; 4-Integral displacement device; A1-Tie rod; A2-Extrusion block; A3-Universal connector; A4-Floating support component; A5-Drive component; A6-Mounting ring; A7-Internal expansion wedge block; A31-First universal joint; A32-Second universal joint; A33-Connecting rod; A41-Outer support ring; A42-Inner floating ring; A43-Elastic component; A100-Extrusion inclined surface; A200-Pressure inclined surface; 21-Lifting device; 22-Conforming support component; 31-Horizontal moving device; 32-Vertical moving device; 33-Clamp mounting frame; 34-External conformal clamp. Detailed Implementation

[0037] Example 1:

[0038] This embodiment provides a turning and straightening device for thin-walled tubular parts, such as... Figure 1 As shown, it includes:

[0039] The dynamic internal expansion centering device 1 includes a dynamic extrusion device and an internal expansion part circumferentially surrounding the extrusion part. The dynamic extrusion device can automatically adjust to a position concentric with the tubular part under the action of extrusion reaction force during the extrusion of the internal expansion part. The internal expansion part can internally expand and fix the tubular part under the extrusion action of the dynamic extrusion device.

[0040] Floating support device 2, which can float and support the outer wall of the tubular part as the dynamic extrusion device moves;

[0041] A concentricity detection device, which is used to detect and calibrate the axial position of a dynamic extrusion device;

[0042] The dynamic external clamping device 3 can dynamically adjust to a position coaxial with the tubular part and clamp the tubular part externally based on the positional difference between its own axis position and the axis position of the dynamic extrusion device.

[0043] The overall displacement device 4, based on the positional difference between the axis of the dynamic extrusion device and the axis of the lathe, drives the dynamic internal expansion centering device 1 and the dynamic external clamping device 3 to move in a plane perpendicular to the axis of the lathe, so that the axis of the tubular part is coaxial with the axis of the lathe.

[0044] A method for machining correction of thin-walled tubular parts, based on a machining correction device, includes the following steps:

[0045] Step 1: Install the dynamic extrusion device and the inner expansion part into the port of the tubular part. The dynamic extrusion device extrudes the inner expansion part, and the inner expansion part expands and fixes the inner wall of the port of the tubular part. At the same time, the dynamic extrusion device automatically adjusts to a position concentric with the tubular part under the action of the extrusion reaction force.

[0046] Step 2: After the internal expansion and fixing of the pipe parts is completed, the axial position of the dynamic extrusion device is detected by the concentricity detection device. The floating support device 2 moves up and down based on the axial position of the dynamic extrusion device to assist in supporting the exterior of the pipe parts.

[0047] Step 3: The dynamic external clamping device 3 calculates the first position difference between its own axis position and the axis position of the dynamic extrusion device, and moves to a position where its own axis is coaxial with the axis of the dynamic extrusion device according to the first position difference.

[0048] Step 4: The external parts of the tubular parts are clamped and fixed by the dynamic external clamping device 3;

[0049] Step 5: Calculate the second position difference between the axis of the dynamic extrusion device and the axis of the lathe. Based on the second position difference, the overall displacement device 4 drives the dynamic internal expansion centering device 1 and the dynamic external clamping device 3 to move in a plane perpendicular to the axis of the lathe until the axis of the tubular part is coaxial with the axis of the lathe.

[0050] The dynamic internal expansion centering device 1 first expands and fixes the inside of the pipe part's port. Under the extrusion action of the dynamic extrusion device, the internal expansion part contacts the inner wall of the pipe part's port and expands and fixes the inner wall of the pipe part's port. At this time, the dynamic extrusion device is subjected to the extrusion reaction force of the internal expansion part and floats in a plane perpendicular to the axis of the pipe part under the action of the extrusion reaction force until the axis of the dynamic extrusion device is coaxial with the axis of the pipe part. At this point, the concentricity detection device detects the axial position of the dynamic extrusion device, i.e., the actual axial position of the tubular part, and sends the axial position of the dynamic extrusion device to the external controller. The dynamic external clamping device 3 sends its own axial position to the external controller. The external controller calculates the first position difference between the axial position of the dynamic extrusion device and the axial position of the dynamic external clamping device 3 in real time, and controls the dynamic external clamping device 3 to move in a plane perpendicular to the axial position of the tubular part according to the first position difference, until the axial position of the dynamic external clamping device 3 is coaxial with the axial position of the dynamic extrusion device. Then, the outer wall of the tubular part is clamped and fixed by the dynamic external clamping device 3, completing the final fixation of the tubular part and preventing the tubular part from moving during subsequent movement.

[0051] Then, the second position difference between the axis of the dynamic extrusion device and the axis of the lathe is detected by the concentricity detection device. Based on the second position difference, the overall displacement device 4 is controlled by the external controller to drive the dynamic internal expansion centering device 1 and the dynamic external clamping device 3 to move in a plane perpendicular to the axis of the lathe. During the movement of the overall displacement device 4, the dynamic internal expansion centering device 1 and the dynamic external clamping device 3 remain stationary relative to the tubular parts until the axis of the dynamic extrusion device is coaxial with the axis of the lathe. At this time, the axis of the tubular parts is coaxial with the axis of the lathe, thus completing the centering adjustment of the tubular parts.

[0052] Furthermore, the overall displacement device 4 adopts an existing three-axis moving stage, which can realize movement in the X, Y, and Z axes.

[0053] Example 2:

[0054] This embodiment discloses a turning and straightening device for thin-walled tubular parts, which is an improvement on Embodiment 1, such as... Figure 2 and Figure 3As shown, the dynamic extrusion device includes a pull rod A1, an extrusion block A2, a universal connector A3, a floating support A4, and a driving component A5. The first end of the pull rod A1 is connected to the driving end of the driving component A5 through the universal connector A3. The second end of the pull rod A1 is coaxially connected to the extrusion block A2. The floating support A4 is fitted on the outside of the pull rod A1. The floating support A4 can support the pull rod A1 and move with the pull rod A1. 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.

[0055] The driving component A5 includes a driving cylinder. The end of the telescopic rod of the driving cylinder is connected to the first end of the pull rod A1 via a universal joint A3. The axis of the driving cylinder is 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. 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. During the floating process of the pull rod A1, the floating support component A4 provides floating support for the pull rod A1, ensuring the stability of the floating pull rod A1.

[0056] The rest of this embodiment is the same as that of Embodiment 1, so it will not be described again.

[0057] Example 3:

[0058] This embodiment discloses a turning and straightening device for thin-walled tubular parts, which is an improvement on embodiment 1 or 2, such as... Figure 2 and Figure 3 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.

[0059] 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.

[0060] The rest of this embodiment is the same as that of embodiment 1 or 2, so it will not be described again.

[0061] Example 4:

[0062] This embodiment discloses a turning and straightening device for thin-walled tubular parts, which is an improvement on any one of embodiments 1-3, such as... Figure 4 As 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.

[0063] 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.

[0064] The rest of this embodiment is the same as any one of embodiments 1-3, so it will not be described again.

[0065] Example 5:

[0066] This embodiment discloses a turning and straightening device for thin-walled tubular parts, which is an improvement on any one of embodiments 1-4, such as... Figure 3 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.

[0067] 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.

[0068] The rest of this embodiment is the same as any one of embodiments 1-4, so it will not be described again.

[0069] Example 6:

[0070] This embodiment discloses a turning and straightening device for thin-walled tubular parts, which is an improvement on any one of embodiments 1-5, such as... Figure 5 and Figure 6 As shown, the dynamic external clamping device 3 includes a horizontal moving device 31, a vertical moving device 32, a clamp mounting frame 33, and an external conforming clamp 34. The horizontal moving end of the horizontal moving device 31 is provided with the vertical moving device 32, and the vertical moving end of the vertical moving device 32 is provided with the clamp mounting frame 33. The clamp mounting frame 33 is provided with an external conforming clamp 34 corresponding to the outer wall of the tubular part.

[0071] The real-time position of the cylinder center axis, which is parallel to the axis of the dynamic extrusion device, at the center of the fixture mounting frame 33 is detected by a coaxiality sensor. The positional difference between the cylinder center axis and the axis of the dynamic extrusion device is calculated by an external computer. Then, the horizontal moving device 31 and the vertical moving device 32 are controlled to move in the corresponding strokes in the horizontal and vertical directions, so that the cylinder center axis and the axis of the dynamic extrusion device are coaxial. At this time, the external conformal clamps 34 located on the telescopic shafts at both ends of the fixture mounting frame 33 are symmetrically set up with respect to the axis of the dynamic extrusion device. Then, the external conformal clamps 34 on the upper and lower sides can be moved synchronously to coaxially clamp and fix the external parts of the tubular parts.

[0072] The rest of this embodiment is the same as any one of embodiments 1-5, so it will not be described again.

[0073] Example 7:

[0074] This embodiment discloses a turning and straightening device for thin-walled tubular parts, which is an improvement on any one of embodiments 1-6, such as... Figure 5 and Figure 7 As shown, the floating support device 2 includes a lifting device 21 and a conformal support member 22. The lifting end of the lifting device 21 is provided with the conformal support member 22, and the top of the conformal support member 22 is provided with a conformal support groove.

[0075] The axis of the conformal support 22 and the axis of the tubular part are both located in the same vertical plane. The conformal support 22 is driven to rise and fall by the lifting device 21, so that the conformal support 22 can float and support the outer wall of the tubular part along with the floating of the dynamic extrusion device, thus ensuring the stability of the entire tubular part.

[0076] Furthermore, a number of balls are evenly distributed on the inner surface of the conformal support groove.

[0077] The rest of this embodiment is the same as any one of embodiments 1-6, so it will not be described again.

[0078] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications or equivalent changes made to the above embodiments based on the technical essence of the present invention shall fall within the protection scope of the present invention.

Claims

1. A turning and straightening device for thin-walled tubular parts, characterized in that, include: Dynamic internal expansion centering device (1), the dynamic internal expansion centering device (1) includes a dynamic extrusion device and an internal expansion part circumferentially surrounding the extrusion part. The dynamic extrusion device can automatically adjust to a position concentric with the tubular part under the action of extrusion reaction force during the extrusion of the internal expansion part. The internal expansion part can internally expand and fix the tubular part under the extrusion action of the dynamic extrusion device. A floating support device (2) is capable of floating support for the outer wall of the tubular parts by moving with the dynamic extrusion device; A concentricity detection device, which is used to detect and calibrate the axial position of a dynamic extrusion device; The dynamic external clamping device (3) can dynamically adjust to a position coaxial with the tubular parts and clamp the tubular parts externally based on the positional difference between its own axial position and the axial position of the dynamic extrusion device. The overall displacement device (4) drives the dynamic internal expansion centering device (1) and the dynamic external clamping device (3) to move in a plane perpendicular to the lathe axis according to the positional difference between the axis of the dynamic extrusion device and the lathe axis, so that the axis of the tubular part is coaxial with the lathe axis; the dynamic extrusion device includes a pull rod (A1), an extrusion block (A2), a universal joint (A3), a floating support (A4), and a driving component (A5). The first end of the pull rod (A1) is connected to the driving end of the driving component (A5) through the universal joint (A3). The second end of the pull rod (A1) is coaxially connected to the extrusion block (A2). The external part of the pull rod (A1) is fitted with a floating support (A4). The floating support (A4) can support the pull rod (A1) and move with the pull rod (A1). The extrusion block (A2) is provided with an extrusion inclined surface (A100). The internal expansion part is provided with a surface that is coaxial with the extrusion inclined surface (A100). The pressure-bearing inclined surface (A200) of the A100) is matched; the inner expansion part includes a mounting ring (A6) and an inner expansion wedge (A7). A floating support (A4) is provided inside the center 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 along the center of the mounting ring (A6). The inner sidewall of the inner expansion wedges (A7) is provided with a pressure-bearing inclined surface (A200); the dynamic external clamping device (3) includes a horizontal moving device (31), a vertical moving device (32), a clamp mounting frame (33), and an external conforming clamp (34). The horizontal moving end of the horizontal moving device (31) is provided with a vertical moving device (32). The vertical moving end of the vertical moving device (32) is provided with a clamp mounting frame (33). The clamp mounting frame (33) is provided with an external conforming clamp (34) corresponding to the outer wall of the tubular part.

2. The turning and straightening device for thin-walled tubular parts according to claim 1, 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).

3. The turning and straightening device for thin-walled tubular parts according to claim 2, 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).

4. A turning and straightening device for thin-walled tubular parts according to any one of claims 1-3, characterized in that, The floating support device (2) includes a lifting device (21) and a conformal support member (22). The lifting end of the lifting device (21) is provided with a conformal support member (22), and the top of the conformal support member (22) is provided with a conformal support groove.

5. The turning and straightening device for thin-walled tubular parts according to claim 4, characterized in that, The conformal support groove has several balls evenly distributed on its inner groove surface.

6. A method for machining and correcting thin-walled tubular parts, implemented based on the machining and correcting device according to any one of claims 1-5, characterized in that, Includes the following steps: Step 1: Install the dynamic extrusion device and the inner expansion part into the port of the tubular part. The dynamic extrusion device extrudes the inner expansion part, and the inner expansion part expands and fixes the inner wall of the port of the tubular part. At the same time, the dynamic extrusion device automatically adjusts to a position concentric with the tubular part under the action of the extrusion reaction force. Step 2: After the pipe parts are fixed by internal expansion, the axial position of the dynamic extrusion device is detected by the concentricity detection device. The floating support device (2) moves up and down based on the axial position of the dynamic extrusion device to assist in supporting the outside of the pipe parts. Step 3: The dynamic external clamping device (3) calculates the first position difference between its own axis position and the axis position of the dynamic extrusion device, and moves to a position where its own axis is coaxial with the axis of the dynamic extrusion device according to the first position difference; Step 4: Use the dynamic external clamping device (3) to clamp and fix the outside of the tubular parts; Step 5: Calculate the second position difference between the axis position of the dynamic extrusion device and the axis of the lathe. The overall displacement device (4) drives the dynamic internal expansion centering device (1) and the dynamic external clamping device (3) to move in a plane perpendicular to the axis of the lathe based on the second position difference until the axis of the tubular part is coaxial with the axis of the lathe.

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