A tooling fixture and machining method for machining thin-walled parts with incomplete circumference

Abstract

This invention relates to a fixture and method for machining thin-walled parts with incomplete circumference, belonging to the field of machine tool accessories. It solves one of the problems in existing technologies: difficulty in clamping and positioning thin-walled parts with incomplete circumference during machine tool processing, easy deformation during processing, and difficulty in re-clamping and positioning after deformation. The fixture of this invention includes a main positioning support module, an auxiliary support module, and a conformal support module. The stiffness of the top support surface of the flexible support component of the auxiliary support module is less than the stiffness of the contouring working surface of the conformal fixture of the conformal support module. The fixture for machining thin-walled parts with incomplete circumference has three working modes. This invention uses multiple support forms in combination to achieve rapid clamping and positioning of thin-walled parts with incomplete circumference and adaptive support, reducing processing deformation and allowing the fixture to be adjusted to adapt to deformation generated during processing.

Description

Technical Field

[0001] This invention relates to the field of machine tool accessories, and in particular to a tooling fixture and machining method for machining thin-walled parts with incomplete circumference. Background Technology

[0002] Incomplete circumferential thin-walled parts refer to parts made by cutting and segmenting thin-walled cylinders, retaining part of the cylinder's circumferential structure. They have an open, non-closed shape, representing only a portion of a complete circumference. These parts are characterized by light weight, high strength, and smooth geometric shapes, and are widely used in high-end manufacturing fields such as aerospace, defense equipment, and automotive manufacturing. However, due to their structural characteristics of large size (axial length ≥ 1500 mm), weak rigidity, and thin wall thickness (≤ 3 mm), incomplete circumferential thin-walled parts are prone to deformation during processing, severely restricting machining accuracy and product quality.

[0003] Currently, due to the complexity and diversity of the structure of incomplete circumferential thin-walled parts, the design and application of fixtures for thin-walled parts are highly dependent on experience. On the one hand, the adaptation of general fixtures to parts lacks scientific basis and standardized procedures, and the selection of parts in clamping operations is highly arbitrary. On the other hand, the adaptation and debugging of thin-walled parts and fixtures require a lot of time and cost. Due to the large number of support points, workers need to repeatedly check and adjust parameters such as clamping points and clamping force one by one to ensure clamping accuracy and stability. This results in low tooling layout efficiency and high labor intensity, which seriously restricts the processing quality and production efficiency of thin-walled parts.

[0004] The prior art discloses a semi-flexible spatial UV-curable resin auxiliary support fixture, including an angle adjustment component and a support clamping component; the angle adjustment component includes a lifting platform, a ball joint shaft, an end cap, and a fixture base; by rotating the eccentric shaft, the circular slider is driven to move axially, and the angle between the overall support surface of the fixture and the blade is adjusted by the ball joint; however, this invention requires the photocurable resin to change from liquid to solid under sufficient ultraviolet light to form an annular support surface, which first places certain requirements on the operation and processing environment of the parts, and at the same time, due to the design of the structure, the provision of support force is not reliable for some thin-walled parts with a large amount of material to be removed.

[0005] Existing technology also includes a low-cost vacuum adsorption fixture structure for skin, which utilizes a honeycomb aluminum substrate and thin steel plates to achieve a lightweight skin fixture structure design. While providing stable support for the skin, it significantly reduces the difficulty and cost of equipment manufacturing, meeting the requirements of large-scale automated production. For different types of skin, new fixtures can be quickly assembled simply by reassembling multiple thin steel plates. While the skin contour surface made of resin plastic is simple to manufacture and easy to replace, this invention only provides conformal support for the parts and does not achieve complete positioning of the parts. This makes the parts prone to movement during processing, leading to significant deformation and severely affecting the processing quality and efficiency of the skin. Summary of the Invention

[0006] Based on the above analysis, the present invention aims to provide a tooling fixture and machining method for machining incomplete circumferential thin-walled parts, in order to solve one of the problems in the prior art of incomplete circumferential thin-walled parts being difficult to clamp and position when machined, easily deformed during machining, and difficult to clamp and position again after deformation.

[0007] Specifically, the present invention provides a tooling fixture for machining thin-walled parts with incomplete circumference, including a main positioning support module, an auxiliary support module, and a conformal support module; the stiffness of the top support surface of the flexible support component of the auxiliary support module is less than the stiffness of the contour working surface of the finishing conformal fixture of the conformal support module.

[0008] The machining fixture for incomplete circumferential thin-walled parts has three working modes:

[0009] Rough machining mode of the inner cavity: The main positioning support module positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part. The flexible support component of the auxiliary support module is in the extended state. The top support surface of the flexible support component abuts against the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part, providing floating support for the arc-shaped outer circumferential surface. At the same time, the finishing conformal fixture of the conformal support module is in the retracted state. There is a gap between the contour working surface of the finishing conformal fixture and the arc-shaped outer circumferential surface.

[0010] Rough machining mode of outer peripheral surface: The main positioning support module positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part, the flexible support component of the auxiliary support module is in a retracted state, and at the same time, the finishing conformal fixture of the conformal support module is in a retracted state.

[0011] Internal cavity finishing mode: The main positioning support module positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part. The flexible support component of the auxiliary support module is in a retracted state, and there is a gap between the top support surface of the flexible support component and the arc-shaped outer circumferential surface. At the same time, the finishing conformal fixture of the conformal support module is in an extended state. The contoured working surface of the finishing conformal fixture abuts against the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part, providing conformal support to the arc-shaped outer circumferential surface.

[0012] The main positioning support module includes multiple columns, which are evenly distributed in two rows on the chassis; there are multiple conformal support modules, which are respectively set between every two opposite columns; there are multiple auxiliary support modules, which are respectively set between two adjacent conformal support modules.

[0013] Furthermore, the column includes a positioning and clamping mechanism and a column frame, the positioning and clamping mechanism is fixedly connected to the top of the column frame, and the bottom of the column frame is fixedly mounted on the chassis;

[0014] The positioning and clamping mechanism includes a fixed base plate, a first clamping plate, a first clamping plate pad, and a second clamping plate.

[0015] The fixed base plate is fixedly installed on the top of the column frame. The first clamping plate pad is fixedly installed on the outer edge of the upper surface of the fixed base plate. The first clamping plate is installed on the first clamping plate pad through a threaded shaft. The first clamping plate rotates and moves up and down relative to the first clamping plate pad. The second clamping plate is installed on the fixed base plate.

[0016] Furthermore, the positioning and clamping mechanism also includes a clamping plate lifting unit;

[0017] The second clamping plate is mounted on the fixed base plate via a clamping plate lifting unit and is driven by the clamping plate lifting unit to move up and down relative to the fixed base plate.

[0018] Furthermore, the clamp lifting unit includes a dovetail groove-shaped stop, a lower inclined wedge plate, and an upper inclined wedge plate;

[0019] The dovetail groove-shaped stop is installed on both sides of the rectangular groove on the fixed base plate and connected to the fixed base plate; the top of the dovetail groove-shaped stop is attached to the dovetail groove on both sides of the second clamping plate, and the second clamping plate moves up and down relative to the dovetail groove-shaped stop.

[0020] The lower inclined wedge plate and the upper inclined wedge plate are disposed between the second clamping plate and the fixed base plate and are tightly attached to each other by means of inclined surfaces. The lower inclined wedge plate moves laterally back and forth, driving the upper inclined wedge plate to move up and down under the action of the inclined surfaces. The upper inclined wedge plate is connected to the second clamping plate and drives the second clamping plate to move up and down.

[0021] Furthermore, the clamp lifting unit also includes a drive bolt;

[0022] Threaded through holes are provided on both sides of the dovetail-shaped stop blocks. The drive bolt is located in the threaded through hole of one side of the dovetail-shaped stop block. The drive bolt extends into the inside of the dovetail-shaped stop block and abuts against one side end face of the lower inclined wedge plate. By rotating the drive bolt, the lower inclined wedge plate is driven to move horizontally away from the drive bolt.

[0023] Furthermore, the positioning and clamping mechanism also includes positioning pins, which are disposed on the first and last positioning and clamping mechanisms distributed axially.

[0024] Furthermore, the auxiliary support module includes multiple flexible support components, the top support surfaces of the multiple flexible support components together form an arc-shaped support surface, and there is a gap between adjacent top support surfaces; and the flexible support components can swing independently in all directions.

[0025] Furthermore, the contouring working surface of the contoured support module's finishing contoured fixture is a continuous arc-shaped smooth surface with the same shape and size as the arc-shaped outer peripheral surface of the rough-machined part.

[0026] On the other hand, the present invention provides a method for machining a thin-walled part with incomplete circumference, which uses a tooling fixture for machining thin-walled parts with incomplete circumference as described above to clamp and fix the part, including the following steps:

[0027] S1: Clamp the incomplete circumferential thin-walled part, and put the machining fixture for the incomplete circumferential thin-walled part into the internal cavity rough machining mode, and perform internal cavity rough machining on the incomplete circumferential thin-walled part.

[0028] S2: Flip and clamp the incomplete circumferential thin-walled part, so that the machining fixture for the incomplete circumferential thin-walled part is in the rough machining mode of the outer circumferential surface, and perform rough machining on the outer circumferential surface of the incomplete circumferential thin-walled part.

[0029] S3: Flip and clamp the incomplete circumferential thin-walled part, so that the machining fixture for the incomplete circumferential thin-walled part is in the internal cavity finishing mode, and perform internal cavity finishing on the incomplete circumferential thin-walled part.

[0030] Compared with the prior art, the present invention can achieve at least one of the following beneficial effects:

[0031] (1) This invention provides a tooling fixture for machining incomplete circumferential thin-walled parts. The main positioning support module cooperates with the process chucks on both sides of the incomplete circumferential thin-walled part to achieve clamping and positioning of the incomplete circumferential thin-walled part. In the rough machining mode of the inner cavity, the top support surface of the flexible support component of the auxiliary support module provides auxiliary floating support for the outer circumferential surface of the incomplete circumferential thin-walled part, which can reduce the internal stress and large deformation generated during machining, and improve the machining quality and machining accuracy of the part. In the fine machining mode of the inner cavity, the conformal support module provides fine machining. The conformal working surface of the conformal fixture provides conformal support for the outer circumferential surface of a thin-walled part with an incomplete circumference, allowing the finishing conformal fixture to fit tightly against the outer circumferential surface of the part. At this point, the outer circumferential surface of the part can be strictly fixed during machining, thus playing a role in fixing the shape and ensuring the wall thickness. By making the stiffness of the top support surface of the flexible support component less than the stiffness of the conformal working surface of the finishing conformal fixture, the tooling fixture of this invention can not only adapt to the greater stress and deformation caused by the large cutting amount during rough machining of the internal cavity, but also provide better support with less deformation during finishing, ensuring the accuracy of finishing.

[0032] (2) The incomplete circumferential thin-walled part processing fixture of the present invention, by placing the column on the two sides of the two parts and arranging the conformal support module and the auxiliary support module alternately below the part, makes the entire part clamped quickly, the force is uniform, provides stable support and reserves a gap to release stress, and the support position is also alternately spaced during roughing and finishing, so that the deformation of the part is small and uniform throughout the entire processing process, which can effectively improve the product forming accuracy.

[0033] (3) The tooling fixture for machining thin-walled parts with incomplete circumference of the present invention, wherein the positioning pin can realize the rapid positioning of the part, the first clamping plate can be quickly tightened by a wrench to press the process clamps on both sides of the thin-walled part with incomplete circumference, and the part can be clamped. At the same time, it can be quickly disassembled, which can realize rapid clamping and rapid disassembly, greatly improving the clamping efficiency.

[0034] (4) The tooling fixture for machining incomplete circumferential thin-walled parts of the present invention can adjust the position of the incomplete circumferential thin-walled part when the outer circumferential surface of the incomplete circumferential thin-walled part cannot be tightly fitted to the auxiliary support module or conformal support module due to the dimensional error of the blank or the deformation caused by processing. The driving bolt of the clamping plate lifting unit of the positioning clamping mechanism can be adjusted to drive the lifting of the second clamping plate of the positioning clamping mechanism, thereby adjusting the position of the incomplete circumferential thin-walled part so that its outer circumferential surface is tightly fitted to the auxiliary support module or conformal fixture, thereby improving the assembly and adjustment efficiency and assembly and adjustment accuracy.

[0035] (5) The tooling fixture for machining thin-walled parts with incomplete circumference of the present invention includes an auxiliary support module comprising multiple flexible support components. The top support surfaces of the multiple flexible support components together form an arc-shaped support surface, and there is a gap between adjacent top support surfaces. The flexible support components can swing independently in all directions, thereby achieving adaptive floating support of the outer circumference of the part. Even when the part is deformed, it can still stick to the surface of the part, thereby achieving effective support for the part, reducing the internal stress and large deformation generated during machining, and improving the machining quality and machining accuracy of the part product.

[0036] (6) The machining fixture for incomplete circumferential thin-walled parts of the present invention makes the contouring working surface of the finishing fixture a continuous arc-shaped smooth surface that is consistent with the shape and size of the arc-shaped outer circumferential surface of the part after machining. This allows the contouring working surface of the finishing fixture to fit tightly with the outer circumferential surface of the part. Furthermore, since the contouring working surface of the finishing fixture has a large rigidity, it can strictly fix the outer circumferential surface of the part during machining, thereby playing the role of fixing and ensuring wall thickness.

[0037] In this invention, the above-described technical solutions can be combined with each other to achieve more preferred combinations. Other features and advantages of this invention will be set forth in the following description, and some advantages may become apparent from the description or be learned by practicing the invention. The objects and other advantages of this invention can be realized and obtained from what is particularly pointed out in the description and drawings. Attached Figure Description

[0038] The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Throughout the drawings, the same reference numerals denote the same parts.

[0039] Figure 1 This is a schematic diagram of the tooling fixture of the present invention for clamping a thin-walled part with an incomplete circumference.

[0040] Figure 2 This is a schematic diagram of the tooling fixture for machining thin-walled parts with incomplete circumference according to the present invention;

[0041] Figure 3 A structural diagram of a column in the main positioning support module;

[0042] Figure 4 This is a schematic diagram of the positioning and clamping mechanism in the column.

[0043] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0044] Figure 6 For along Figure 4 Sectional view of the middle BB line;

[0045] Figure 7 for Figure 1 A magnified view of the framed area;

[0046] Figure 8 This is a side view of the column frame;

[0047] Figure 9 For along Figure 8 A cross-sectional view of the CC line.

[0048] Figure label:

[0049] 1- Fixture for machining thin-walled parts with incomplete circumference; 11- Main positioning support module; 111- Positioning and clamping mechanism; 1111- First clamping plate; 1112- First clamping plate pad; 1113- Second clamping plate; 1114- Dovetail groove stop; 1115- Drive bolt; 1116- Fixed base plate; 1117- Lower inclined wedge plate; 1118- Guide pin; 1119- First spring; 11110- Limit bolt; 11111- Upper inclined wedge plate; 11112- Positioning pin; 112- Column frame; 1121- Column square frame; 1122- Copper sleeve; 1123- Safety pin; 1124- Linear guide rail; 1125- Bearing seat; 1126- Crankshaft; 1127- Hand crank spoke wheel; 1128- Locking screw; 1129- Second spring;

[0050] 12-Auxiliary support module; 13-Chassis; 14-Conformal support module;

[0051] 2- Incompletely circumferential thin-walled parts; 3- Circular pallet worktable. Detailed Implementation

[0052] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a part of the present invention and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0053] Example 1

[0054] like Figure 1 , Figure 2 As shown in the figure, this embodiment discloses a tooling fixture for machining incomplete circumferential thin-walled parts, which is used to solve one of the technical problems of low clamping efficiency, easy deformation during machining, poor positioning accuracy, and difficulty in clamping after deformation of large-sized, thin-walled, non-closed incomplete circumferential parts.

[0055] See Figure 1The incomplete circumferential thin-walled part 2 involved in this embodiment is made by cutting and dividing a thin-walled cylinder, retaining part of the circumferential structure of the cylinder. The whole is in the form of an open shape, which is only a part of the complete circumference. Multiple process clamps are provided on both sides of the part.

[0056] To address the problems of incomplete circumferential parts being difficult to clamp and position, and prone to deformation during machining, the structure of the machining fixture 1 for incomplete circumferential thin-walled parts in this embodiment is as follows: Figure 2 As shown, it includes a chassis 13, a main positioning support module 11, an auxiliary support module 12, and a conformal support module 14. The stiffness of the top support surface of the flexible support component of the auxiliary support module 12 is less than the stiffness of the contoured working surface of the precision-machined conformal fixture of the conformal support module 14.

[0057] The machining fixture for incomplete circumferential thin-walled parts in this embodiment has three working modes:

[0058] Rough machining mode of the inner cavity: The main positioning support module 11 positions and holds the process chucks on both sides of the incomplete circumferential thin-walled part. The flexible support component of the auxiliary support module 12 is in the extended state. The top support surface of the flexible support component abuts against the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part 2, providing floating support for the arc-shaped outer circumferential surface. At the same time, the finishing conformal fixture of the conformal support module 14 is in the retracted state. There is a gap between the contour working surface of the finishing conformal fixture and the arc-shaped outer circumferential surface.

[0059] Rough machining mode of outer peripheral surface: The main positioning support module 11 positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part, the flexible support component of the auxiliary support module 12 is in a retracted state, and at the same time the finishing conformal fixture of the conformal support module 14 is in a retracted state.

[0060] Internal cavity finishing mode: The main positioning support module 11 positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part. The flexible support component of the auxiliary support module 12 is in a retracted state, and there is a gap between the top support surface of the flexible support component and the arc-shaped outer circumferential surface. At the same time, the finishing conformal fixture of the conformal support module 14 is in an extended state. The contouring working surface of the finishing conformal fixture abuts against the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part 2, providing conformal support for the arc-shaped outer circumferential surface.

[0061] The main positioning support module 11 includes multiple columns evenly spaced on both sides of the chassis 13, used to cooperate with the process chucks on both sides of the incomplete circumferential thin-walled part 2 to achieve positioning and clamping of the incomplete circumferential thin-walled part 2; multiple conformal support modules 14 are fixedly mounted on the chassis 13 and located between each pair of opposing columns, used to provide conformal support for the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part 2 during internal cavity finishing; multiple auxiliary support modules 12 are fixedly mounted on the chassis 13 and located between two adjacent conformal support modules 14, used to provide floating support for the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part 2 during internal cavity rough machining.

[0062] Among them, conformal support refers to a support method in which the shape and size of the support surface are exactly the same as those of the supported surface; floating support refers to a support method in which the support surface can float (including moving up and down and rotating in all directions) as the supported surface deforms.

[0063] The main positioning support module 11 cooperates with the process chucks on both sides of the incomplete circumferential thin-walled part 2 to achieve positioning support for the incomplete circumferential thin-walled part 2. During the rough machining of the inner cavity, the auxiliary support module 12 provides auxiliary floating support for the outer circumferential surface of the incomplete circumferential thin-walled part 2, which can reduce the internal stress and large deformation generated during machining, and improve the machining quality and accuracy of the part. During the finish machining of the inner cavity, the conformal support module 14 provides conformal support for the outer circumferential surface of the incomplete circumferential thin-walled part 2, so that the finish machining conformal fixture fits tightly with the outer circumferential surface of the part. At this time, the outer circumferential surface of the part can be strictly fixed for machining, thereby playing the role of fixing the shape and ensuring the wall thickness.

[0064] See Figure 2 , Figure 3 The main positioning support module 11 includes multiple columns, which are symmetrically and evenly distributed on both sides of the chassis 13 at a certain distance.

[0065] like Figure 3 As shown, each column includes a positioning and clamping mechanism 111 and a column frame 112. The positioning and clamping mechanism 111 is fixedly connected to the top of the column frame 112 by welding, and the bottom of the column frame 112 is fixedly mounted on the chassis 13. The positioning and clamping mechanism 111 is used to cooperate with the process chucks on both sides of the incomplete circumference thin-walled part 2. The column frame 112 provides rigid support for the positioning and clamping mechanism 111 on one hand, and cooperates with the conformal support module 14 on the other hand, providing power and guidance for the conformal support module 14. The upper plane of the positioning and clamping mechanism 111 is parallel to the bottom plane of the column frame 112, so that the clamping force direction is perpendicular to the reference plane, the force is uniform, and an accurate clamping reference is provided for the part, improving the positioning accuracy of the part.

[0066] like Figure 4 , Figure 5 , Figure 6 As shown, the positioning and clamping mechanism 111 includes a fixed base plate 1116, a first clamping plate 1111, a first clamping plate pad 1112, and a second clamping plate 1113.

[0067] A fixed base plate 1116 is fixedly mounted on the top of the column frame 112. A first clamping plate pad 1112 is fixedly mounted on the outer edge of the upper surface of the fixed base plate 1116, and the first clamping plate pad 1112 is connected to the fixed base plate 1116 by bolts. A first clamping plate 1111 is mounted on the first clamping plate pad 1112 via a threaded shaft, and the first clamping plate 1111 can rotate relative to the threaded shaft. The top of the threaded shaft is provided with a wrench interface, which can be used to drive the threaded shaft to rotate, thereby driving the first clamping plate 1111 to move up and down relative to the first clamping plate pad 1112.

[0068] There is a certain height difference between the lower surface of the first clamping plate 1111 and the upper surface of the fixed base plate 1116. The width of the first clamping plate 1111 is smaller than the width of the first slot and the second slot of the process chuck, and is used to engage with the first slot (when machining the inner circumferential surface of the incomplete circumferential thin-walled part 2) or the second slot (when machining the outer circumferential surface of the incomplete circumferential thin-walled part 2) to achieve axial positioning of the incomplete circumferential thin-walled part 2.

[0069] The second clamping plate 1113 is disposed on the fixed base plate 1116 and can engage with the top or bottom surface of the process chuck of the incompletely circumferential thin-walled part 2, so as to limit the vertical positioning of the process chucks on both sides of the incompletely circumferential thin-walled part 2 together with the first clamping plate 1111. Figure 7 As shown, this enables the clamping and positioning of the incomplete circumferential thin-walled part 2.

[0070] Furthermore, in order to solve the problem that the original clamping stroke of the first clamping plate 1111 cannot directly meet the actual clamping height of the part in some cases, and the problem that the deformation of the part caused by processing makes it impossible to clamp accurately, the positioning and clamping mechanism 111 of this embodiment also includes a clamping plate lifting unit, which is used to drive the second clamping plate 1113 to reciprocate in the vertical direction.

[0071] The second clamping plate 1113 is mounted on the fixed base plate 1116 via a clamping plate lifting unit and can be driven by the clamping plate lifting unit to move up and down relative to the fixed base plate 1116. This accommodates changes in the reference surface caused by deformation of the part during processing or situations where the part's dimensions prevent accurate clamping. The core function of the clamping plate lifting unit is to perform height compensation and force adjustment. When the original clamping stroke of the first clamping plate 1111 cannot directly meet the actual clamping height of the workpiece, the addition of the clamping plate lifting unit can effectively compensate for the height difference, ensuring that the fixture can apply sufficient clamping force to the workpiece with an ideal posture. At the same time, the intervention of the clamping plate lifting unit also optimizes the transmission path of the clamping force, making the load distribution more reasonable, thereby improving the stability and reliability of clamping.

[0072] See Figure 4 , Figure 5 , Figure 6 The clamp lifting unit includes a dovetail groove-shaped stop 1114, a drive bolt 1115, a lower inclined wedge plate 1117, a guide pin 1118, a first spring 1119, a limit bolt 11110, and an upper inclined wedge plate 11111.

[0073] Two dovetail groove-shaped blocks 1114 are provided, extending vertically, with their bottoms installed on the two ends of a rectangular groove on the fixed base plate 1116, and connected to the fixed base plate 1116 by bolts; the top of the dovetail groove-shaped blocks 1114 fits into the dovetail grooves on both sides of the second clamping plate 1113, and the second clamping plate 1113 can move up and down relative to the dovetail groove-shaped blocks 1114.

[0074] See Figure 5 The lower inclined wedge plate 1117 and the upper inclined wedge plate 11111 are disposed between the second clamping plate 1113 and the fixed base plate 1116, and the two are tightly attached by means of inclined surfaces. The lower inclined wedge plate 1117 can move laterally back and forth, driving the upper inclined wedge plate 11111 to move up and down under the action of the inclined surfaces. The upper inclined wedge plate 11111 is connected to the second clamping plate 1113 by bolts (the bolts must not protrude from the upper surface of the second clamping plate 1113), thereby driving the second clamping plate 1113 to move up and down.

[0075] Threaded through holes are provided on the dovetail-shaped stop blocks 1114 on both sides. A drive bolt 1115 is installed in the threaded through hole of one side of the dovetail-shaped stop block 1114. The drive bolt 1115 extends into the inside of the dovetail-shaped stop block 1114 and abuts against one side end face of the lower inclined wedge plate 1117. By rotating the drive bolt 1115, the lower inclined wedge plate 1117 can be driven to move horizontally away from the drive bolt 1115.

[0076] See Figure 5 , Figure 6On the other side, a limiting bolt 11110 is installed in the threaded through hole of the dovetail-shaped stop 1114. The limiting bolt 11110 provides a precisely set mechanical hard stop surface for the lower inclined wedge plate 1117 by adjusting the screw-in depth, thereby limiting its maximum stroke and achieving ultimate limit.

[0077] The lower inclined wedge plate 1117 is also provided with a guide hole on the side near the limiting bolt 11110. The guide pin 1118 is fitted with a first spring 1119 and inserted into the guide hole. Figure 5 As shown, the guide hole on the lower inclined wedge plate 1117 is designed as a stepped hole. Its large-diameter section is used to accommodate the first spring 1119 and provide a spring seat, while the small-diameter section is precisely slidably fitted with the rod of the guide pin 1118. The limiting bolt 11110 and the guide pin 1118 with the first spring 1119 work together to limit the movement of the lower inclined wedge plate 1117. The limiting bolt 11110 and the guide pin 1118 with the first spring 1119 are not directly physically connected; they are two independently installed, complementary components. Both are mounted on the dovetail-shaped stop 1114 and arranged parallel and spaced along the movement direction of the lower inclined wedge 1117, acting on the same side of the lower inclined wedge 1117. The limiting bolt 11110, as an adjustable rigid stop, defines the end position of the inclined wedge's movement. The guide pin 1118 and the first spring 1119 provide a continuous elastic restoring force, ensuring that the inclined wedge automatically retracts to its initial position in contact with the limiting bolt when there is no driving force. When the driving force is removed, the spring force pushes the lower inclined wedge 1117 back to its initial safe position in contact with the drive bolt 1115, ensuring the reliability and safety of the clamp lifting unit operation.

[0078] See Figure 2 The positioning and clamping mechanism 111 for the two columns also includes positioning pins 11112. Preferably, the positioning pins 11112 are respectively disposed on the two columns located at the beginning and end of the axial direction on one side of the chassis 13.

[0079] See Figure 4 as well as Figure 6 The positioning pin 11112 is fixedly disposed in the middle of the fixed base plate 1116 and extends vertically upward, for cooperating with the first positioning pin holes of the process chucks at both ends of the incomplete circumferential thin-walled part 2 to achieve rapid positioning of the incomplete circumferential thin-walled part 2. The second clamping plate 1113 has a through hole in the middle for the positioning pin 11112 to pass through.

[0080] Correspondingly, both the upper inclined wedge plate 11111 and the lower inclined wedge plate 1117 in the clamping plate lifting unit are provided with clearance holes corresponding to the positioning pins 11112. The upper inclined wedge plate 11111 has a circular through hole at its center, allowing it to move only in the vertical direction without offset. The lower inclined wedge plate 1117 has an elongated oval hole (waist-shaped groove) parallel to its direction of movement at its center. This elongated oval hole design ensures that the lower inclined wedge plate 1117 will not interfere with the vertically fixed positioning pins 11112 during horizontal driving, thus reliably converting horizontal propulsion into the vertical lifting motion of the second clamping plate 1113. By setting two positioning pins 11112, rapid positioning of the incompletely circumferential thin-walled part 2 is achieved.

[0081] like Figure 8 , Figure 9 As shown, the column frame 112 includes a column frame 1121, a conformal support positioning unit, a conformal support guiding unit, and a conformal support driving unit. The column frame 1121 is fixedly mounted on the chassis 13; the conformal support positioning unit is located on the upper part of the column frame 1121 for positioning the conformal support module; the conformal support guiding unit is located on the upper-middle part of the side of the column frame 1121 facing the incompletely circumferential thin-walled part 2 for guiding the movement of the conformal support module; the conformal support driving unit is located on the lower-middle part of the column frame 1121, with its output end extending from the side of the column frame 1121 facing the incompletely circumferential thin-walled part 2, for driving the movement of the conformal support module 14 to adjust its height.

[0082] It should be noted that in the two opposing column frames 112, only one column frame 112 must include the conformal support drive unit, while the other column frame 112 may only include the column frame 1121, the conformal support positioning unit, and the conformal support guide unit. This arrangement can reduce some structures and lower equipment costs.

[0083] The column frame 1121 of the column frame 112 is a hollow column and is the main load-bearing body of the main positioning support module 11. The fixing base plate 1116 of the positioning clamping mechanism 111 is welded to the top of the column frame 1121 of the column frame 112 to form the main positioning support module 11.

[0084] The conformal support drive unit includes a bearing housing 1125, a crankshaft 1126, a hand-cranked spoke wheel 1127, and a locking screw 1128. The crankshaft 1126 is supported on the column frame 1121 by the bearing housings 1125 at both ends. One end of the crankshaft, away from the thin-walled part 2 with incomplete circumference, is connected to the hand-cranked spoke wheel 1127 by a set screw, and the other end is connected to the input end of the conformal support module 14 for transmission, which can drive the conformal support module to rotate and thus drive the finishing conformal fixture to move up and down.

[0085] One end of the locking screw 1128 has an arc-shaped groove that abuts against the middle of the crankshaft 1126, while the other end is located on the outside of the column frame 1121 and has a drive handle. The axis of the locking screw 1128 is perpendicular to the axis of the crankshaft 1126. After adjusting the conformal support module 14 to the desired height by rotating the hand crank spoke 1127, turning the drive handle rotates the locking screw 1128, causing its arc-shaped groove to abut against the middle of the crankshaft 1126. The resulting friction locks the crankshaft 1126, preventing the hand crank spoke 1127 from rotating accidentally.

[0086] The conformal support guide unit includes a linear guide rail 1124. The linear guide rail 1124 is bolted to the side of the column frame 1121, located between the conformal support drive unit and the conformal support positioning unit, and extends along the height direction of the column frame 112. It is used to cooperate with the sliders on both sides of the conformal support module 14 to provide precise and stable vertical guidance.

[0087] The conformal support positioning unit includes a copper sleeve 1122, a safety pin 1123, and a second spring 1129.

[0088] The top of the column frame 1121 is provided with a horizontally extending through hole that is perpendicular to the axis of the incomplete circumferential thin-walled part 2. Copper sleeves 1122 are respectively provided in the through holes on both side walls. Safety pins 1123 are slidably provided in the copper sleeves 1122. The copper sleeves 1122 can provide wear-resistant and friction-reducing support, extending the service life of the equipment.

[0089] The safety pin 1123 has a stepped surface. The second spring 1129 is sleeved on the safety pin 1123, with one end abutting against the stepped surface and the other end abutting against the end face of the copper sleeve 1122 on the side away from the incomplete circumferential thin-walled part 2, pushing the safety pin 1123 toward the side of the incomplete circumferential thin-walled part 2. The safety pin 1123 has a downwardly extending limiting block at the end away from the incomplete circumferential thin-walled part 2, thereby limiting the axial movement of the safety pin 1123.

[0090] In use, pull the end of the safety pin 1123 outward to retract the safety pin 1123 toward the side of the incomplete circumferential thin-walled part 2. After the conformal support module 14 is moved into place, release the safety pin 1123. Under the action of the second spring 1129, the safety pin 1123 is inserted into the second positioning pin hole on the end face of the precision-machined conformal fixture, thereby improving the height position accuracy of the precision-machined conformal fixture.

[0091] The safety pin 1123 provides positioning and protection for the finishing conformal fixture. When the finishing conformal fixture moves to the working position, the safety pin 1123 is inserted to ensure the positional accuracy of the finishing conformal fixture and to prevent the finishing conformal fixture from falling accidentally.

[0092] Auxiliary support module 12, such as Figure 2 As shown, it includes auxiliary support units and an auxiliary support frame. Several auxiliary support units are mounted on the auxiliary support frame and connected to it by bolts. The top support surfaces of these auxiliary support units are all located on the same circumferential surface, forming an arc-shaped support surface. There are gaps between adjacent top support surfaces, and the flexible support assembly can independently oscillate in all directions, thereby adapting to local deformation of the part during processing. The auxiliary support frame is fixedly mounted on the chassis 13, and the auxiliary support units abut against the outer circumferential surface of the incompletely circumferential thin-walled part 2, providing a certain supporting force for the part 2.

[0093] The auxiliary support unit includes a flexible support component and a pneumatic drive component. The top support surface of the flexible support component is an elastic arc surface that can abut against the outer peripheral surface of the incompletely circumferential thin-walled part 2. The pneumatic drive component drives the flexible support component to move up and down, thereby providing support force to the outer peripheral surface of the incompletely circumferential thin-walled part 2.

[0094] When the pneumatic drive component pushes the entire flexible support component upward, causing the top support surface to contact the workpiece surface, the uneven contact reaction force will drive the flexible support component to swing adaptively around the joint bearing until the top support surface and the outer circumference of the workpiece achieve a large-area uniform flexible fit.

[0095] It should be noted that if the processing environment is an intelligent, unmanned production line layout, meaning that it is not possible to arrange air ducts and pipes, the pneumatic drive component of the auxiliary support unit can be replaced with a threaded connecting rod and secured with a nut. This threaded connecting rod can be manually raised and lowered.

[0096] When the incomplete circumferential thin-walled part 2 is rough-machined in the inner cavity, the pneumatic drive assembly starts to work, which can provide a certain support for the outer circumferential surface of the incomplete circumferential thin-walled part 2 to reduce a certain amount of milling internal stress, thereby improving the machining accuracy.

[0097] During the roughing stage, the pneumatic drive assembly is activated, driving the power cylinders of all auxiliary support units to lift synchronously. When the top support surface of each unit contacts the bottom surface of the workpiece, under the action of contact reaction force, each unit can achieve independent adaptive posture adjustment through the omnidirectional swing of the spherical bearings, thereby closely conforming to the incomplete circumferential shape of the workpiece. Numerous top support surfaces together form a continuous, flexible, adaptive support array, providing uniform and stable auxiliary support for the weakly rigid workpiece during machining, effectively suppressing cutting vibration and deformation, and is a key design feature for improving machining accuracy and quality.

[0098] The pneumatic drive assembly consists of conventional pneumatic components, which will not be described in detail here.

[0099] like Figure 2 As shown, the conformal support module 14 includes a precision-machined conformal fixture, a slider, a slider flange, a universal coupling, and a worm gear jack.

[0100] The base of the worm gear jack is bolted to the chassis 13 and positioned between two opposing columns. The flange at the top of the worm gear jack is bolted to the underside of a precision-machined conformal fixture, enabling the fixture to move up and down. The worm gear jack is connected to a universal coupling via a key, and the input end of the universal coupling transmits driving force from the crankshaft 1126 of the main positioning support module 11.

[0101] The top of the finishing conformal fixture is an arc-shaped contouring working surface, which is a continuous arc-shaped smooth surface with the same shape and size as the rough-machined arc-shaped outer circumference of the incomplete circumference thin-walled part. This surface can circumferentially contact and conform to the rough-machined outer circumference of the incomplete circumference thin-walled part 2. The two end faces of the finishing conformal fixture are respectively provided with second locating pin holes, a slider, and a slider flange. The slider is bolted to both sides of the finishing conformal fixture via the slider flange. The slider can slide in engagement with the linear guide rail 1124 mounted on the main positioning support module 11, thereby guiding the finishing conformal fixture to vertical lifting and lowering movements.

[0102] When the inner cavity of the incomplete circumferential thin-walled part 2 is being finished (at this time, the outer circumferential surface of the incomplete circumferential thin-walled part 2 has already been rough-machined), the worm gear lift is raised so that the contour working surface of the finishing conformal fixture contacts and fits the outer circumferential surface of the incomplete circumferential thin-walled part 2. The safety pin 1123 in the main positioning support module 11 is inserted into the second positioning pin hole on the end face of the finishing conformal fixture, so that the height position of the finishing conformal fixture is accurate, and the degree of fit can be detected by feeler gauge, thereby playing the role of fixing the shape and ensuring the wall thickness of the incomplete circumferential thin-walled part 2.

[0103] When the incomplete circumferential thin-walled part 2 is rough-machined in the inner cavity, the concave surface of the incomplete circumferential thin-walled part 2 faces upward, and the process chuck is clamped on the main positioning support module 11 through the first clamping plate 1111, the positioning pin 11112, and the second clamping plate 1113. At this time, the middle part of the outer cylindrical surface of the incomplete circumferential thin-walled part 2 is supported by multiple auxiliary support modules 12, which improves the overall static rigidity of the part. When the incomplete circumferential thin-walled part 2 is fine-machined in the inner cavity, the power cylinder of the auxiliary support module 12 retracts and does not contact the outer cylindrical surface of the incomplete circumferential thin-walled part 2. At the same time, all conformal support modules 14 are raised to the working surface of the fine machining conformal fixture and fit tightly against the outer cylindrical surface of the incomplete circumferential thin-walled part 2, thereby fulfilling the functional requirements of fixing the shape and maintaining the wall thickness of the incomplete circumferential thin-walled part 2.

[0104] The process chucks are evenly distributed on both sides of the incomplete circumference part. The upper surface of the process chucks is flush with the two end faces of the incomplete circumference part, and the process chucks as a whole protrude outward from the outer circumference. The vertical cross-section of the process chuck parallel to the axis is H-shaped, with a first slot at the top (when the concave surface of the incomplete circumference thin-walled part 2 is facing upward) and a second slot at the bottom.

[0105] Among the multiple process chucks on one side of the incompletely circumferential thin-walled part 2, the first and last chucks, distributed axially, are selected as positioning references. First positioning pin holes are provided on these two process chucks, extending vertically and connecting the first and second slots. Correspondingly, in the positioning clamping mechanism on the same side, two positionally matched positioning pins 11112 are installed on the first and last positioning clamping mechanisms, distributed axially. During clamping, the two first positioning pin holes of the incompletely circumferential thin-walled part 2 are respectively fitted onto the two positioning pins 11112 of the corresponding columns, thereby uniquely determining the position and orientation of the incompletely circumferential thin-walled part 2 in the horizontal plane, achieving complete positioning and effectively reducing under-positioning and over-positioning. By setting up process chucks, the incompletely circumferential thin-walled part 2 is easy to clamp and position, convenient to operate, and accurately positioned.

[0106] In this embodiment, the incomplete circumferential thin-walled part machining fixture 1 is used to fix the incomplete circumferential thin-walled part 2 on the circular pallet worktable 3 for subsequent processing. During fixing, the concave surface of the incomplete circumferential thin-walled part 2 faces upward (or downward), and it is placed on the positioning and clamping mechanism 111 on the top of the main positioning support module 11 of the incomplete circumferential thin-walled part machining fixture 1 through the process chucks on both sides. It is positioned by the positioning pin 11112 and clamped by the first clamping plate 1111. The incomplete circumferential thin-walled part machining fixture 1 is installed above the circular pallet worktable 3 by the pressure plate 4, which improves the clamping stability during processing.

[0107] Compared with the prior art, the tooling fixture for machining incomplete circumferential thin-walled parts provided by the present invention can fully position and clamp the incomplete circumferential thin-walled parts. It can play an auxiliary support role for the incomplete circumferential thin-walled parts during rough or fine machining of the inner cavity. At the same time, the fine adjustment mechanism ensures that the outer circumferential surface of the incomplete thin-walled parts can be closely attached to the auxiliary support, thereby improving the machining accuracy.

[0108] Example 2

[0109] Another specific embodiment of the present invention discloses a method for machining a partially circumferentially thin-walled part, which uses the machining fixture for partially circumferentially thin-walled parts in Embodiment 1 to clamp and fix the part, including the following steps:

[0110] S1: Clamp the incomplete circumferential thin-walled part, and put the machining fixture for the incomplete circumferential thin-walled part into the internal cavity rough machining mode, and perform internal cavity rough machining on the incomplete circumferential thin-walled part.

[0111] S2: Flip and clamp the incomplete circumferential thin-walled part, so that the machining fixture for the incomplete circumferential thin-walled part is in the rough machining mode of the outer circumferential surface, and perform rough machining on the outer circumferential surface of the incomplete circumferential thin-walled part.

[0112] S3: Flip and clamp the incomplete circumferential thin-walled part, so that the machining fixture for the incomplete circumferential thin-walled part is in the internal cavity finishing mode, and perform internal cavity finishing on the incomplete circumferential thin-walled part.

[0113] Step S1 specifically includes:

[0114] S11: Adjust the tooling fixture for machining thin-walled parts with incomplete circumference to the initial state; first, the positioning clamping mechanism 111 above each column needs to be adjusted to the lowest position, the first clamping plate 1111 is adjusted to the highest position and rotated to the side to avoid interference with the parts;

[0115] S12: Place the incomplete circumferential thin-walled part 2 with its concave surface facing up onto the tooling fixture, and insert the locating pin 11112 into the first locating pin hole to complete the axial positioning;

[0116] S13: Clamping the process chucks of the incompletely circumferential thin-walled part 2: Drive the first clamping plate 1111 to move vertically downward along the column height direction, press each process chuck, and complete the clamping;

[0117] S14: Provide auxiliary support to the middle of the outer circumferential surface of the incomplete circumferential thin-walled part 2: The pneumatic drive assembly of the auxiliary support module 12 works, and the top support surface of each auxiliary support unit can be tightly fitted to the outer circumferential surface of the part under the action of the power cylinder.

[0118] S15: Perform rough machining on the inner cavity of the part.

[0119] Step S2 includes:

[0120] S21: Axial positioning part: Flip the incomplete circumferential thin-walled part so that the outer circumferential surface faces upward, and then place the incomplete circumferential thin-walled part 2 on the upper plane of the second clamping plate 1113 of the positioning clamping mechanism. At this time, the positioning pin 11112 is inserted into the first positioning pin hole to complete the axial positioning.

[0121] S22: Compensation for the offset caused by part deformation: Since the incomplete circumferential thin-walled part 2 will deform due to the release of internal stress, the process chucks on both sides will be displaced, causing the positioning reference to shift. At this time, the gap between each process chuck of the part and the second clamping plate 1113 at the top of each column of the tooling fixture can be detected by feeler gauge, and the clamping plate lifting unit can be adjusted by wrench to move the second clamping plate 1113 up and down to compensate for the part deformation.

[0122] S23: Part clamping and machining: Rotate the first clamping plate 1111 above the second slot, tighten the threaded shaft with a wrench, drive the first clamping plate 1111 to move vertically downward along the column height direction, press each process chuck, complete the clamping, and perform rough machining of the outer circumference of the part.

[0123] Step S3 includes:

[0124] S31: Flip the incomplete circumferential thin-walled part 2 so that the inner cavity surface faces upward, and place the part on the upper plane of the second clamping plate 1113 of the positioning clamping mechanism. At this time, the positioning pin 11112 is inserted into the first positioning pin hole to complete the axial positioning.

[0125] S32: Provide conformal support to the outer circumferential surface of the incomplete circumferential thin-walled part 2: lift all the finishing conformal fixtures, and insert the safety pin 1123 in the main positioning support module into the second positioning pin hole on the end face of the finishing conformal fixture to ensure the height position accuracy of the finishing conformal fixture and make it fit the outer circumferential surface of the part.

[0126] S33: Compensating for the offset caused by part deformation: The gap between each process chuck of the part and the working surface of the finishing conformal fixture is detected by feeler gauge. If a large gap is found at a certain fitting point, the position and orientation of the part can be adjusted and the deformation compensated by adjusting the clamping plate lifting unit of the positioning clamping mechanism on the corresponding main positioning support module, so that it fits tightly with the finishing conformal fixture.

[0127] S34: Part clamping and machining: Rotate the first clamping plate 1111 above the first slot, tighten the threaded shaft with a wrench, drive the first clamping plate 1111 to move vertically downward along the column height direction, press each process chuck, complete the clamping, and perform fine machining of the part's inner cavity.

[0128] S35: After the inner cavity of the incomplete circumferential thin-walled part 2 is finished, slowly lower all the conformal support modules 14, and then remove the clamping elements on both sides of the incomplete circumferential thin-walled part 2 to complete the overall part processing.

[0129] This embodiment provides a method for machining incompletely circumferential thin-walled parts. It enables complete positioning and clamping of the parts. When rough machining the inner cavity, it provides auxiliary support to the outer circumferential surface of the part, reducing internal stress generated during machining and minimizing deformation. When finishing the inner cavity, a conformal auxiliary support fixture is used to solidify the outer circumferential surface, ensuring the required wall thickness. Finally, a fine-tuning method is provided to ensure the auxiliary support closely adheres to the deformed outer circumferential surface of the part, thereby comprehensively improving machining quality and efficiency.

[0130] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. An incomplete circumferential thin-walled part machining tooling fixture, characterized in that, It includes a main positioning support module, an auxiliary support module, and a conformal support module; the stiffness of the top support surface of the flexible support component of the auxiliary support module is less than the stiffness of the contouring working surface of the precision-machined conformal fixture of the conformal support module. The machining fixture for incomplete circumferential thin-walled parts has three working modes: Rough machining mode of the inner cavity: The main positioning support module positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part. The flexible support component of the auxiliary support module is in the extended state. The top support surface of the flexible support component abuts against the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part, providing floating support for the arc-shaped outer circumferential surface. At the same time, the finishing conformal fixture of the conformal support module is in the retracted state. There is a gap between the contour working surface of the finishing conformal fixture and the arc-shaped outer circumferential surface. Rough machining mode of outer peripheral surface: The main positioning support module positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part, the flexible support component of the auxiliary support module is in a retracted state, and at the same time, the finishing conformal fixture of the conformal support module is in a retracted state. Internal cavity finishing mode: The main positioning support module positions and clamps the process chucks on both sides of the incomplete circumferential thin-walled part; the flexible support component of the auxiliary support module is in a retracted state; there is a gap between the top support surface of the flexible support component and the arc-shaped outer circumferential surface; at the same time, the finishing conformal fixture of the conformal support module is in an extended state; the contouring working surface of the finishing conformal fixture abuts against the arc-shaped outer circumferential surface of the incomplete circumferential thin-walled part, providing conformal support to the arc-shaped outer circumferential surface. The main positioning support module includes multiple columns, which are evenly distributed in two rows on the chassis; there are multiple conformal support modules, which are respectively set between every two opposite columns; there are multiple auxiliary support modules, which are respectively set between two adjacent conformal support modules. The column includes a positioning and clamping mechanism and a column frame. The positioning and clamping mechanism is fixedly connected to the top of the column frame, and the bottom of the column frame is fixedly mounted on the chassis. The positioning and clamping mechanism includes a fixed base plate, a first clamping plate, a first clamping plate pad, and a second clamping plate. The fixed base plate is fixedly installed on the top of the column frame. The first clamping plate pad is fixedly installed on the outer edge of the upper surface of the fixed base plate. The first clamping plate is installed on the first clamping plate pad through a threaded shaft. The first clamping plate rotates and moves up and down relative to the first clamping plate pad. The second clamping plate is installed on the fixed base plate. The positioning and clamping mechanism also includes a clamping plate lifting unit; The second clamping plate is mounted on the fixed base plate via a clamping plate lifting unit and is driven by the clamping plate lifting unit to move up and down relative to the fixed base plate. The column frame includes a column frame, a conformal support positioning unit, a conformal support guiding unit, and a conformal support driving unit. The column frame is fixedly mounted on the chassis. The conformal support positioning unit is located on the upper part of the column frame and is used to position the conformal support module. The conformal support guiding unit is located on the upper-middle part of the side of the column frame facing the incomplete circumference thin-walled part and is used to guide the movement of the conformal support module. The conformal support driving unit is located on the lower-middle part of the column frame, and its output end extends from the side of the column frame facing the incomplete circumference thin-walled part to drive the movement of the conformal support module to adjust the height of the conformal support module.

2. The partial circumferential thin-walled part machining fixture of claim 1, wherein, The clamp lifting unit includes a dovetail groove-shaped stop block, a lower inclined wedge plate, and an upper inclined wedge plate; The dovetail groove-shaped stop is installed on both sides of the rectangular groove on the fixed base plate and connected to the fixed base plate; the top of the dovetail groove-shaped stop is attached to the dovetail groove on both sides of the second clamping plate, and the second clamping plate moves up and down relative to the dovetail groove-shaped stop. The lower inclined wedge plate and the upper inclined wedge plate are disposed between the second clamping plate and the fixed base plate and are tightly attached to each other by means of inclined surfaces. The lower inclined wedge plate moves laterally back and forth, driving the upper inclined wedge plate to move up and down under the action of the inclined surfaces. The upper inclined wedge plate is connected to the second clamping plate and drives the second clamping plate to move up and down.

3. The partial circumferential thin-walled part machining fixture of claim 2, wherein, The clamp lifting unit also includes a drive bolt; Threaded through holes are provided on both sides of the dovetail-shaped stop blocks. The drive bolt is located in the threaded through hole of one side of the dovetail-shaped stop block. The drive bolt extends into the inside of the dovetail-shaped stop block and abuts against one side end face of the lower inclined wedge plate. By rotating the drive bolt, the lower inclined wedge plate is driven to move horizontally away from the drive bolt.

4. The partial circumferential thin-walled part machining fixture clamp according to any one of claims 1-3, characterized in that, The positioning and clamping mechanism also includes positioning pins, which are disposed on the first and last positioning and clamping mechanisms that are axially distributed.

5. The machining fixture for incompletely circumferentially thin-walled parts according to claim 1, characterized in that, The auxiliary support module includes multiple flexible support components, the top support surfaces of the multiple flexible support components together form an arc-shaped support surface, and there is a gap between adjacent top support surfaces; and the flexible support components can swing independently in all directions.

6. The tooling fixture for machining thin-walled parts with incomplete circumference according to claim 1, characterized in that, The contouring working surface of the contoured support module's finishing contoured fixture is a continuous arc-shaped smooth surface with the same shape and size as the arc-shaped outer peripheral surface of the incomplete circumferential thin-walled part after rough machining.

7. A method for machining a thin-walled part with an incomplete circumference, characterized in that, The process of clamping and fixing a part using a machining fixture for incomplete circumferential thin-walled parts according to any one of claims 1-6 includes the following steps: S1: Clamp the incomplete circumferential thin-walled part, and put the machining fixture for the incomplete circumferential thin-walled part into the internal cavity rough machining mode, and perform internal cavity rough machining on the incomplete circumferential thin-walled part. S2: Flip and clamp the incomplete circumferential thin-walled part, so that the machining fixture for the incomplete circumferential thin-walled part is in the rough machining mode of the outer circumferential surface, and perform rough machining on the outer circumferential surface of the incomplete circumferential thin-walled part. S3: Flip and clamp the incomplete circumferential thin-walled part, so that the machining fixture for the incomplete circumferential thin-walled part is in the internal cavity finishing mode, and perform internal cavity finishing on the incomplete circumferential thin-walled part.

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