Flexible supporting device for U-shaped frame part machining and part machining method

Abstract

A flexible supporting device for U-shaped frame part machining comprises a supporting body, the supporting body comprises a first supporting part, a connecting piece, a second supporting part, a spring and a locking mechanism, and the first supporting part is elastically connected with the second supporting part through the spring; the spring, part of the first supporting part and part of the second supporting part are arranged in the connecting piece; the locking mechanism is arranged on the connecting piece, and the first supporting part, the second supporting part and the connecting piece are locked through the locking mechanism; the supporting device further comprises a connecting frame. The three supporting bodies are connected through the connecting frame. The three independent supporting devices form a triangular supporting face, the farthest end of the cantilever is covered, rigidity is enhanced, meanwhile, an elastic pre-pressing and self-locking cooperation mechanism is adopted, a pre-pressing spring provides initial supporting force and counteracts instantaneous deformation caused by cutting force, a wedge face transmits locking force in a positioning mode through a locking screw, elastic self-adaption of the supporting force is achieved, and the mechanical performance of the cantilever is improved. The surface stress concentration of the part is avoided, the pressure applying precision is high, and the manufacturing cost is low.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of mechanical processing clamps, and particularly relates to a flexible supporting device for U-shaped frame part machining and a part machining method. BACKGROUND

[0002] The U-shaped frame part has a complex structure, a large size, a hollow cantilever form, poor rigidity, and is easy to deform. According to the traditional process mode, the part is processed in multiple processes and multiple aging processes. This method has a long processing cycle and high cost, and cannot meet the demand of rapid production. The U-shaped frame part has a complex assembly relationship with other peripheral parts. The shafting coaxiality, perpendicularity and three surface flatness formed by the two direction round holes on the two side surfaces and the bottom surface of the part have strict size, shape and position tolerance accuracy requirements, and the coaxiality even reaches 0.015 mm.

[0003] In the prior art, in order to prevent the deformation of the U-shaped frame part during machining, there are usually two methods: one is to reduce the cutting force and stress by changing the tool, cutting parameters and artificial aging, but reducing the cutting force and stress not only reduces the production efficiency, but also cannot completely solve the problem of part deformation caused by no effective support; the second is to use auxiliary support method, such as "a transverse support device suitable for U-shaped structure shell machining and mounting method, the transverse support device is composed of a support seat, two glue-containing blocks, two telescopic rods, a plurality of locking screws, two fine adjustment rods; the top of the support seat is provided with shoulder through holes on both sides; the side wall of the shoulder through hole is provided with locking screw mounting hole and fine adjustment rod mounting hole; one telescopic rod is inserted into the shoulder through hole on one side of the support seat, and the outer end of the telescopic rod is fixedly connected with one glue-containing block; the side wall of the telescopic rod is provided with a rack; the end of the fine adjustment rod is a gear structure; when the fine adjustment rod is inserted into the fine adjustment rod mounting hole in the side wall of the shoulder through hole of the support seat, it can cooperate with the rack on the side wall of the telescopic rod, and the telescopic rod can be axially moved by rotating the fine adjustment rod. The application can increase the rigidity of the cantilever part of the part and prevent machining vibration, and has the function of damping and shock absorption, so as to ensure the machining requirement of the U-shaped structure part. The device is convenient, simple, reliable and flexible, can effectively inhibit the machining vibration of the cantilever structure part, and can improve the machining precision of the cantilever structure part. Although the rigidity can be enhanced, the method of single-point support and separate locking does not have enough effective support points, and the stress is easy to concentrate; the adjustment depends on the gear and rack, and frequent fine adjustment is needed, which is time-consuming; the device structure is complex, the size is large, the base needs to be fixed on the machine tool, which has limitations on the machining machine tool, and the part clamping is basically suspended, which has poor stability and limited adaptability. For example, "a flexible clamp for thin-walled large parts, which is composed of a base, a support, a plurality of support positioners fixedly installed on the support in an array, a suction cup and a support positioner adjusting mechanism; the screw nut rod transmission mechanism of the support positioner is driven by a driven gear; the support positioner adjusting mechanism is composed of a vertical arm installed on an X-Y workbench and a driving gear installed on the upper end of the vertical arm; the Y-direction driving mechanism of the X-Y workbench is composed of a ball screw nut pair driven by a stepping motor, and the X-direction driving mechanism is composed of an X-direction guide rail moving together with the nut of the ball screw nut pair and an X-direction slider driven by a synchronous toothed belt transmission of a stepping motor; the vertical arm is fixed on the X-direction slider; the driving gear is driven by a Z-direction stepping motor, and is engaged with the driven gear through a gear meshing detection and control mechanism. The application adjusts the height of all support positioners and suction cups through gear multi-point engagement adjustment by using only one set of adjusting mechanism containing three motors, which saves a lot of motors and can greatly reduce the manufacturing cost of the clamp; and the control difficulty is relatively small. Although the rigidity can be enhanced, the machining precision can be met, and the machining efficiency of single part can be improved, the design of special tooling fixture has small compatibility, low flexibility and high cost, and the cost performance is not high.

[0004] Therefore, it is urgent to develop a flexible support device for U-shaped frame part machining. SUMMARY In view of the above problems, the present application provides a flexible support device for U-shaped frame part machining. The technical solutions adopted by the embodiments of the present application are as follows.

[0005] In one aspect, the present application provides a flexible support device for U-shaped frame part machining, comprising a support main body, the support main body comprising: a first support part, a connecting piece, a second support part, a spring, and a locking mechanism. The first support part is elastically connected with the second support part through the spring. The spring, part of the first support part, and part of the second support part are arranged in the connecting piece. The locking mechanism is arranged on the connecting piece, and the first support part, the second support part, and the connecting piece are locked through the locking mechanism. The support device further comprises a connecting frame. The support main body is provided in three, and the three support main bodies are respectively a first support main body, a second support main body, and a third support main body, which are connected through the connecting frame. In one specific embodiment, the first support part comprises a first support assembly, a first transmission support rod, and a first transmission wedge. The first support assembly is provided with a first support screw hole, the first transmission support rod is provided with a first transmission mounting thread and a second transmission mounting thread, and the first transmission wedge is provided with a first transmission force mounting screw hole.

[0006] The tail end of the first transmission mounting thread is provided with a first limiting step, and the tail end of the second transmission mounting thread is provided with a second limiting step. Part of the first transmission mounting thread is screwed into the first support screw hole, and part of the second transmission mounting thread is screwed into the first transmission force mounting screw hole. The first support assembly is telescopically connected with the first transmission wedge through the first transmission support rod. The second support part comprises a second support assembly, a second transmission support rod, and a second transmission wedge. The second support assembly is provided with a second support screw hole, the second transmission support rod is provided with a third transmission mounting thread and a fourth transmission mounting thread, and the second transmission wedge is provided with a second transmission force mounting screw hole.

[0007] The tail end of the third transmission mounting thread is provided with a third limiting step, and the tail end of the fourth transmission mounting thread is provided with a fourth limiting step. Part of the third transmission mounting thread is screwed into the second support screw hole, and part of the fourth transmission mounting thread is screwed into the second transmission force mounting screw hole. The second support assembly is telescopically connected with the second transmission wedge through the second transmission support rod.

[0008] In one specific implementation, the locking mechanism includes a first locking screw and a second locking screw. The connecting piece includes an intermediate body, a first locking screw hole, and a second locking screw hole. The first locking screw is arranged in the first locking screw hole, and the second locking screw is arranged in the second locking screw hole.

[0009] In one specific implementation, the support device further includes a guide mechanism, which includes a guide screw, a first guide slot, and a second guide slot. The guide screw includes a first guide screw and a second guide screw.

[0010] In one specific implementation, the connecting piece further includes a first guide hole and a second guide hole. Part of the first guide screw is arranged in the first guide slot through the first guide hole. Part of the second guide screw is arranged in the second guide slot through the second guide hole.

[0011] The guide slot cooperates with the guide screw to limit the lateral displacement of the force transmission wedge block, ensuring that the transmission direction error is ≤0.02mm.

[0012] In one specific implementation, the first guide slot is arranged at one end of the first force transmission wedge block connected with the spring. The second guide slot is arranged at one end of the second force transmission wedge block connected with the spring.

[0013] In one specific implementation, the first force transmission wedge block is provided with a first wedge surface, and the second force transmission wedge block is provided with a second wedge surface. The first wedge surface is arranged at one end of the first force transmission wedge block connected with the spring. The second wedge surface is arranged at one end of the second force transmission wedge block connected with the spring.

[0014] In one specific implementation, the first force transmission wedge block includes a first connecting surface, and the second force transmission wedge block includes a second connecting surface. The first connecting surface is connected with the spring, and the second connecting surface is connected with the spring. The acute angle between the first wedge surface and the first connecting surface is 80°. The acute angle between the second wedge surface and the second connecting surface is 80°.

[0015] The first wedge surface 131 transmits locking force through the first locking screw 510 with a semicircular positioning bead, and the second wedge surface 331 transmits locking force through the second locking screw 520 with a semicircular positioning bead, realizing elastic self-adaptation of support force and avoiding stress concentration on the surface of the part.

[0016] In one specific embodiment, the connecting frame is a Y-shaped connecting frame, which comprises a connecting frame body, a first connecting frame telescopic rod, and a second connecting frame telescopic rod; The connecting frame body is arranged on the first support body, the first connecting frame telescopic rod is arranged on the second support body, and the second connecting frame telescopic rod is arranged on the third support body. The connecting frame body is provided with a first mounting hole and a second mounting hole, part of the first connecting frame telescopic rod is arranged in the first mounting hole, and part of the second connecting frame telescopic rod is arranged in the second mounting hole.

[0017] In another aspect, the application provides a U-shaped frame part machining method, which uses a flexible support device for U-shaped frame part machining to support the U-shaped frame part. The first support body, the second support body, and the third support body are arranged around the first through hole of the U-shaped frame part and the second through hole of the U-shaped frame part in a radial manner. The first support part of the first support body is arranged at the upper semicircular position of the first through hole, and the second support part of the first support body is arranged at the position corresponding to the upper semicircular position of the first through hole relative to the second through hole.

[0018] The technical scheme provided by the embodiments of the application has at least the following beneficial effects: the three independent support devices of the application form a triangular support surface, cover the farthest end of the cantilever, and enhance rigidity; meanwhile, the elastic pre-pressing and self-locking synergistic mechanism is used, the pre-pressing spring provides initial support force, offsets instantaneous deformation caused by cutting force, the wedge surface is positioned and transmits locking force through a locking screw, elastic self-adaptation of support force is realized, and stress concentration on the surface of the part is avoided; the application has high pressing precision, the spring is pre-pressed between the two transmission wedge blocks, uniform elastic support force is provided, the guide groove is matched with the guide screw to limit the lateral displacement of the transmission wedge block, the transmission direction error is ensured to be less than or equal to 0.02 mm, the two-way threaded transmission support rod realizes stroke fine adjustment, the contact point of the dial gauge is arranged on the outer wall of the cantilever of the part, the installation and positioning precision is measured, and it is ensured that the dial gauge pointer does not jump by more than 0.02 mm, that is, there is no overload pressing. The application has strong flexibility, the device has a stroke adjustment assembly, the length of the transmission support rod is adjustable, the support stroke range is 240 mm to 340 mm, a larger range can also be achieved by replacing the transmission support rod, and different lengths of transmission support rods can be used to be compatible with asymmetric large thin-walled hollow structure parts; the device has replaceable contact blocks, the contact blocks are made of nylon material, are connected to the end of the transmission support rod through threads, and are suitable for different profiles such as planes, arcs, and inclined surfaces. The application has low manufacturing cost, the device has no special use and personnel requirements, is easy to operate, and it is very simple for an operator to install and adjust the device. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A working state diagram of the flexible support device of the embodiments of the application; Figure 2: The flexible support device of the embodiment of the present application is exploded view; Figure 3 : The first support assembly of the embodiment of the present application is cross-sectional view; Figure 4 : The second support assembly of the embodiment of the present application is cross-sectional view; Figure 5 : The locking screw of the embodiment of the present application is cross-sectional view; Figure 6 : The connecting frame structure of the embodiment of the present application is schematic view; The figure mark explanation: 100, the first support part; 110, the first support assembly; 111, the first support screw hole; 120, the first transmission support rod; 121, the first transmission installation screw thread; 122, the second transmission installation screw thread; 130, the first force transmission wedge; 131, the first wedge surface; 132, the first guide groove; 133, the first force transmission installation screw hole; 200, the connecting piece; 300, the second support part; 310, the second support assembly; 311, the second support screw hole; 320, the second transmission support rod; 321, the third transmission installation screw thread; 322, the fourth transmission installation screw thread; 330, the second force transmission wedge; 331, the second wedge surface; 332, the second guide groove; 333, the second force transmission installation screw hole; 400, the spring; 510, the first locking screw; 520, the second locking screw; 600, the guide screw; 610, the first guide screw; 620, the second guide screw; 700, the connecting frame; 710, the connecting frame main body; 720, the first connecting frame telescopic rod; 730, the second connecting frame telescopic rod; 800, the first through hole; 900, the second through hole. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present application more clear, the following will make further detailed description to the embodiment of the present application in combination with the drawings.

[0021] In the description of the present application, it needs to be understood that the orientation or position relationship indicated by the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation to the present application. In addition, the features defined as "first" and "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified.

[0022] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "setting" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0023] The following will be described in detail in combination with the accompanying drawings Figures 1-5 The present application will be further described in detail.

[0024] In one aspect, the present application provides a flexible support device for U-shaped frame part machining, such as Figure 2 The flexible support device of the embodiment of the present application is shown in the exploded view, which comprises a support main body, the support main body comprises: a first support part 100, a connecting piece 200, a second support part 300, a spring 400, a locking mechanism 500; the first support part 100 is elastically connected with the second support part 300 through the spring 400; the spring 400 is pre-pressed between the two side force transmission wedge blocks, providing uniform elastic support force.

[0025] The first support part 100 comprises a first support assembly 110, a first transmission support rod 120 and a first force transmission wedge block 130; the first support assembly 110 is fixedly connected with the first force transmission wedge block 130 through the first transmission support rod 120; the first support assembly 110 is provided with a first support screw hole 111, the first transmission support rod 120 is provided with a first transmission mounting thread 121 and a second transmission mounting thread 122, and the first force transmission wedge block 130 is provided with a first force transmission mounting screw hole 133. The tail end of the first transmission mounting thread 121 is provided with a first limiting step, and the tail end of the second transmission mounting thread 122 is provided with a second limiting step; part of the first transmission mounting thread 121 is screwed into the first support screw hole 111, and part of the second transmission mounting thread 122 is screwed into the first force transmission mounting screw hole 133.

[0026] The second support part 300 comprises a second support assembly 310, a second transmission support rod 320, and a second transmission wedge 330. The second support assembly 310 is fixedly connected with the second transmission support rod 320 and the second transmission wedge 330. The second support assembly 310 is provided with a second support screw hole 311. The second transmission support rod 320 is provided with a third transmission mounting thread 321 and a fourth transmission mounting thread 322. The second transmission wedge 330 is provided with a second transmission mounting screw hole 333. The tail end of the third transmission mounting thread 321 is provided with a third limiting step, and the tail end of the fourth transmission mounting thread 322 is provided with a fourth limiting step. Part of the third transmission mounting thread 321 is screwed into the second support screw hole 311, and part of the fourth transmission mounting thread 322 is screwed into the second transmission mounting screw hole 333.

[0027] The bidirectional transmission support rod realizes stroke fine adjustment. The dial gauge contact is arranged on the outer wall of the cantilevered part, the installation positioning precision is measured, and it is ensured that the dial gauge pointer does not jump more than 0.02 mm, that is, there is no overload pressure. The length of the transmission support rod is adjustable, the support stroke range is 240 mm to 340 mm, a larger range can be achieved by replacing the transmission support rod, and different lengths of transmission support rods can be used to support asymmetric large thin-walled hollow structure parts. The device has replaceable support assemblies. The support assemblies are made of nylon and are connected to the end of the transmission support rod through threads. The support assemblies are adapted to different profiles such as planes, arcs, and inclined surfaces. The limiting steps are arranged to ensure that the screw hole does not exceed the maximum screwing stroke, that is, it does not exceed the thread coverage range.

[0028] The spring 400, part of the first support part 100, and part of the second support part 300 are arranged in the connecting piece 200. The locking mechanism 500 is arranged on the connecting piece 200. The first support part 100, the second support part 300, and the connecting piece 200 are locked through the locking mechanism 500. The locking mechanism 500 comprises a first locking screw 510 and a second locking screw 520. The connecting piece 200 comprises a middle body, a first locking screw hole, and a second locking screw hole. The first locking screw 510 is arranged in the first locking screw hole, and the second locking screw 520 is arranged in the second locking screw hole. Preferably, the locking screw is a semicircular positioning bead locking screw.

[0029] The support device further comprises a guide mechanism, which comprises a guide screw 600, a first guide groove 132, and a second guide groove 332. The guide screw 600 comprises a first guide screw 610 and a second guide screw 620.

[0030] The connecting piece 200 further comprises a first guide hole and a second guide hole; a part of the first guide screw 610 is arranged in the first guide groove 132 through the first guide hole; and a part of the second guide screw 620 is arranged in the second guide groove 332 through the second guide hole. The guide groove cooperates with the guide screw to limit the lateral displacement of the force transmission wedge, and to ensure that the transmission direction error is less than or equal to 0.02 mm.

[0031] The first guide groove 132 is arranged at one end of the first force transmission wedge 130 connected with the spring 400; and the second guide groove 332 is arranged at one end of the second force transmission wedge 330 connected with the spring 400.

[0032] The first force transmission wedge 130 is provided with a first wedge surface 131, and the second force transmission wedge 330 is provided with a second wedge surface 331; the first wedge surface 131 is arranged at one end of the first force transmission wedge 130 connected with the spring 400; and the second wedge surface 331 is arranged at one end of the second force transmission wedge 330 connected with the spring 400.

[0033] The first force transmission wedge 130 comprises a first connecting surface, and the second force transmission wedge 330 comprises a second connecting surface; the first connecting surface is connected with the spring 400, and the second connecting surface is connected with the spring 400; the angle of the acute angle between the first wedge surface 131 and the first connecting surface is 80°; and the angle of the acute angle between the second wedge surface 331 and the second connecting surface is 80°; the first wedge surface 131 transmits locking force through the half-round positioning bead first locking screw 510 surface positioning, and the second wedge surface 331 transmits locking force through the half-round positioning bead second locking screw 520 surface positioning, so as to realize the elastic self-adaptation of supporting force and avoid stress concentration on the surface of the part.

[0034] The supporting device further comprises a connecting frame 700; the supporting body is provided in three, and the three supporting bodies are respectively a first supporting body A, a second supporting body B and a third supporting body C; the three supporting bodies are connected through the connecting frame 700, the three supporting bodies are arranged in parallel with each other, the central axes of the three supporting bodies form a triangular column, and a triangular supporting surface is formed to cover the farthest end of the cantilever and enhance the rigidity.

[0035] The connecting frame 700 is a Y-shaped connecting frame, which comprises a connecting frame main body 710, a first connecting frame telescopic rod 720 and a second connecting frame telescopic rod 730; the connecting frame main body 710 is arranged on the first supporting body A, the first connecting frame telescopic rod 720 is arranged on the second supporting body B, and the second connecting frame telescopic rod 730 is arranged on the third supporting body C; the connecting frame main body 710 is provided with a first mounting hole and a second mounting hole, a part of the first connecting frame telescopic rod 720 is arranged in the first mounting hole, and a part of the second connecting frame telescopic rod 730 is arranged in the second mounting hole. The connecting piece 200 is used for connecting the supporting transmission structure on both sides of the limiting position, and the aperture is matched with the first transmission wedge 130 and the second transmission wedge 330, thereby playing a limiting and guiding role. Part of the guiding screw is arranged in the transmission wedge guiding groove through the connecting piece 200, thereby playing a limiting and guiding role. The spring 400 is arranged in the connecting piece 200, the spring 400 is pre-pressed between the two transmission wedges, thereby providing a uniform elastic supporting force. The transmission supporting rod is selected according to the required stroke, and a suitable transmission supporting rod is selected. The transmission supporting rod and the supporting assembly are connected through threads. The supporting assembly can be used according to the actual situation. The semi-circular positioning bead locking screw is matched with the wedge surface on the transmission wedge to press and lock, thereby ensuring the directionality.

[0036] In another embodiment of the present application, the connecting frame 700 is a triangular frame, and the three supporting bodies are respectively arranged at the three vertices of the triangular frame. The connecting arm of the triangular frame is telescopic.

[0037] On the other hand, the present application provides a U-shaped frame part machining method. A flexible supporting device for U-shaped frame part machining is used to support the U-shaped frame part. The first supporting body A, the second supporting body B and the third supporting body C are arranged radially around the first through hole 800 of the U-shaped frame part and the second through hole 900 of the U-shaped frame part. The first supporting part of the first supporting body A is arranged at the upper semicircular position of the first through hole 800, and the second supporting part of the first supporting body A is arranged at the position corresponding to the upper semicircular position of the first through hole 800 opposite to the second through hole 900.

[0038] As Figure 1 As shown in the working state diagram of the flexible supporting device of the embodiment of the present application, the transmission supporting rod can achieve a larger and more range of stroke by replacing the transmission supporting rod. The transmission supporting rod with different lengths can be used on both sides to support the asymmetric large thin-walled hollow structure part. In the case of the same force, the greater the contact area, the more uniform the force given to the part, and the smaller the influence. The contact block can be designed by replacing the size and shape of the contact surface to achieve high adaptability. According to the part, the transmission supporting rod and the supporting assembly are selected to complete the assembly of the device, and then the device is placed outside the middle position of the U-shaped cantilever. The semi-circular positioning bead locking screw is not in contact with the transmission wedge. Rotate the transmission supporting rod screw to uniformly adjust the length of both ends, so that the end face of the two supporting assemblies is longer than the inner side wall distance of less than 1mm. The device is pressed into the part cantilever support on both sides. Fix the dial gauge on the main shaft, and the contact point is placed on the outer side wall of the part cantilever. Measure the installation positioning accuracy. When the dial gauge pointer jump is not greater than 0.02mm, rotate the semi-circular positioning bead locking screw to lock the transmission wedge. Finally, at the supporting point, the supporting assembly and the part contact surface are coated with hot melt adhesive to fix the flexible supporting device, and the transverse support of the U-shaped frame cantilever hollow position or the transverse support of the asymmetric large thin-walled hollow part is completed.

[0039] The embodiments are only illustrative of the present application, and are not intended to limit the present application, and those skilled in the art can make modifications to the embodiments without creative contribution after reading the specification, but as long as the modifications are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A flexible support device for U-frame part machining, characterized by, The support device comprises a support body, the support body comprises a first support part (100), a connecting piece (200), a second support part (300), a spring (400), a locking mechanism (500), The first support part (100) is elastically connected with the second support part (300) through the spring (400); The spring (400), part of the first support part (100) and part of the second support part (300) are arranged in the connecting piece (200); The locking mechanism (500) is arranged on the connecting piece (200), and the first support part (100), the second support part (300) and the connecting piece (200) are locked through the locking mechanism (500); The support device further comprises a connecting frame (700); The support body is provided in three, and the three support bodies are respectively a first support body A, a second support body B and a third support body C, and the three support bodies are connected through the connecting frame (700).

2. The flexible support device for U-shaped frame part machining according to claim 1, characterized in that: The first support part (100) comprises a first support assembly (110), a first transmission support rod (120) and a first transmission wedge (130); The first support assembly (110) is provided with a first support screw hole (111), the first transmission support rod (120) is provided with a first transmission mounting thread (121) and a second transmission mounting thread (122), and the first transmission wedge (130) is provided with a first transmission force mounting screw hole (133); The tail end of the first transmission mounting thread (121) is provided with a first limiting step, and the tail end of the second transmission mounting thread (122) is provided with a second limiting step; Part of the first transmission mounting thread (121) is screwed into the first support screw hole (111), and part of the second transmission mounting thread (122) is screwed into the first transmission force mounting screw hole (133); The first support assembly (110) is telescopically connected with the first transmission wedge (130) through the first transmission support rod (120); The second support part (300) comprises a second support assembly (310), a second transmission support rod (320) and a second transmission wedge (330); The second support assembly (310) is provided with a second support screw hole (311), the second transmission support rod (320) is provided with a third transmission mounting thread (321) and a fourth transmission mounting thread (322), and the second transmission wedge (330) is provided with a second transmission force mounting screw hole (333); The tail end of the third transmission mounting thread (321) is provided with a third limiting step, and the tail end of the fourth transmission mounting thread (322) is provided with a fourth limiting step; Part of the third transmission mounting thread (321) is screwed into the second support screw hole (311), and part of the fourth transmission mounting thread (322) is screwed into the second transmission force mounting screw hole (333); The second support assembly (310) is telescopically connected with the second transmission support rod (320) and the second transmission wedge (330).

3. The flexible support device for U-shaped frame part machining according to claim 1, characterized in that: The locking mechanism (500) comprises a first locking screw (510) and a second locking screw (520). The connecting piece (200) comprises an intermediate body, a first locking screw hole, and a second locking screw hole. The first locking screw (510) is arranged in the first locking screw hole, and the second locking screw (520) is arranged in the second locking screw hole.

4. The flexible support device for U-shaped frame part machining according to claim 2, characterized in that: The support device further comprises a guide mechanism, and the guide mechanism comprises a guide screw (600), a first guide slot (132), and a second guide slot (332). The guide screw (600) comprises a first guide screw (610) and a second guide screw (620).

5. The flexible support device for U-shaped frame part machining according to claim 4, characterized in that: The connecting piece (200) further comprises a first guide hole and a second guide hole. Part of the first guide screw (610) is arranged in the first guide slot (132) through the first guide hole. Part of the second guide screw (620) is arranged in the second guide slot (332) through the second guide hole.

6. The flexible support device for U-shaped frame part machining according to claim 4, characterized in that: The first guide slot (132) is arranged at one end of the first transmission wedge (130) connected with the spring (400). The second guide slot (332) is arranged at one end of the second transmission wedge (330) connected with the spring (400).

7. The flexible support device for U-shaped frame part machining according to claim 2, characterized in that: The first transmission wedge (130) is provided with a first wedge surface (131), and the second transmission wedge (330) is provided with a second wedge surface (331). The first wedge surface (131) is arranged at one end of the first transmission wedge (130) connected with the spring (400). The second wedge surface (331) is arranged at one end of the second transmission wedge (330) connected with the spring (400).

8. The flexible support device for U-shaped frame part machining according to claim 7, characterized in that: The first transmission wedge (130) comprises a first connecting surface, and the second transmission wedge (330) comprises a second connecting surface. The first connecting surface is connected with the spring (400), and the second connecting surface is connected with the spring (400). The acute angle between the first wedge surface (131) and the first connecting surface is 80°. The acute angle between the second wedge surface (331) and the second connecting surface is 80°.

9. The flexible support device for U-shaped bracket part machining according to claim 1, characterized in that: The connecting frame (700) is a Y-shaped connecting frame, which comprises a connecting frame body (710), a first connecting frame telescopic rod (720), and a second connecting frame telescopic rod (730); The connecting frame body (710) is arranged on the first support body A, the first connecting frame telescopic rod (720) is arranged on the second support body B, and the second connecting frame telescopic rod (730) is arranged on the third support body C; The connecting frame body (710) is provided with a first mounting hole and a second mounting hole, part of the first connecting frame telescopic rod (720) is arranged in the first mounting hole, and part of the second connecting frame telescopic rod (730) is arranged in the second mounting hole.

10. A method of machining a U-shaped bracket part, characterized by: The flexible support device is used for supporting a U-shaped frame part, and the flexible support device is the flexible support device according to any one of claims 1-9. The first support body A, the second support body B, and the third support body C are arranged around the first through hole (800) and the second through hole (900) of the U-shaped frame part in a radial manner. The first support part of the first support body A is arranged at the upper semicircular position of the first through hole (800), and the second support part of the first support body A is arranged at the position corresponding to the upper semicircular position of the second through hole (900) and the first through hole (800).

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