Combined vibration reduction positioning clamp for cutting aviation special-shaped thin-walled workpiece

Abstract

The invention belongs to the technical field of mechanical design, and discloses a combined vibration reduction positioning clamp for aviation special-shaped thin-wall part cutting machining, which comprises a bottom plate, a positioning unit, a large-aperture supporting unit, a small-aperture supporting unit, a box body clamping unit, a box body bottom plate supporting unit and a box body supporting assembly. The supporting units have good fitting degree, the supporting adjustment range is large, the supporting requirements of workpieces with different diameter sizes and heights can be met, the surface contour of the special-shaped part is reconstructed by arranging the displacement sensors and combining the improved Lagrange algorithm, deformation detection in the machining process of the special-shaped part is achieved, and the machining precision of the special-shaped part is improved. The positioning unit can conduct auxiliary positioning on the space reference of the special-shaped part, and the contact portions of the supporting unit and the clamping unit and the special-shaped part are made of vibration reduction damping materials. The designed integral combined clamp plays a supporting and damping role in flexible clamping of the special-shaped part, vibration in the milling process can be reduced, and the machining precision is improved.

Description

Technical Field

[0001] This invention belongs to the field of mechanical design technology, specifically relating to a combined vibration damping and positioning fixture for machining irregularly shaped thin-walled aerospace parts. Background Technology

[0002] In recent years, the use of irregularly shaped thin-walled parts in the aerospace field has gradually increased. To achieve high rigidity, high specific strength, and lightweight, the design structure and performance of irregularly shaped thin-walled parts need continuous improvement and enhancement, and their materials and structures have also undergone significant changes. The structural characteristics of the aerospace irregularly shaped thin-walled parts addressed in this invention are divided into three parts: the bottom of the box, the box body, and the dual-pipe ventilation hoods of different diameters connected to the box body. These parts have a large radius of gyration, weak rigidity, complex shape and structural features, difficult clamping methods, difficult selection of positioning references, difficult to avoid part deformation, easy interference with the cutting tool during machining, and difficulty in ensuring machining quality and accuracy, facing the dual challenge of improving process stability and machining accuracy. These parts have high requirements for fixture design; if the fixture design is unreasonable, it is very easy to cause excessive clamping deformation and machining chatter during the workpiece machining process. Summary of the Invention

[0003] The purpose of this invention is to provide a combined vibration damping and positioning fixture for machining irregularly shaped thin-walled parts for aerospace applications, so as to solve the problems mentioned in the background art.

[0004] The technical solution of the present invention:

[0005] A combined vibration damping and positioning fixture for machining aerospace irregular thin-walled parts includes a small-diameter support unit 1, a large-diameter support unit 2, a base plate 3, a diameter positioning unit 4, a box clamping unit 5, a box base plate support unit 6, and a box support unit 7. The small-diameter support unit 1 and the large-diameter support unit 2 are independent components. After the base plate 3, the diameter positioning unit 4, the box clamping unit 5, the box base plate support unit 6, and the box support unit 7 are assembled, they each independently support the inner wall of the double-tube vent.

[0006] The base plate 3 consists of two rotatably connected grooved clamping base plates that can adjust the angle of opening and closing, achieving an opening angle of 0-180° depending on the clamping method; a T-shaped sliding groove is formed on the upper surface of the base plate 3;

[0007] The aperture positioning unit 4 includes an upper positioning seat and a lower positioning seat, which are connected by bolts and rubber washers. The circular hole formed after the upper and lower positioning seats are connected fits on the outside of the slot of the double-pipe ventilation hood. The lower positioning seat is provided with a T-shaped structure that matches the T-shaped groove of the base plate 3, so that the aperture positioning unit 4 is fixed on the base plate 3.

[0008] The bottom structures of the box clamping unit 5, the box bottom support 6, and the box support unit 7 are all set as T-shaped structures, which are connected to the T-shaped slide groove on the base plate 3 through keyways. The three can only move in the T-shaped slide groove.

[0009] The large-diameter support unit 2 includes a connecting pin 8, a bolt 9, an upper seat 10, a conical block 11, an expansion support assembly 12, a fixing groove 13, a base 14, a connecting hole 15, and a bolt through hole 16. The upper seat 10 has two through pin holes symmetrically arranged on its left and right sides, and a larger bolt through hole in its center. The conical block 11 is a truncated cone with a bolt through hole at its top center. The bolt 9 is threadedly connected to the bolt through holes of the upper seat 10 and the conical block 11. The expansion support assembly 12 consists of four quarter-cylinders, each with a pin hole at the center of each pair of mating seams to mate with the connecting pin. The connecting pin 8... The upper seat 10, expansion support assembly 12, and base 14 are connected sequentially from top to bottom, achieving axial connection between the three and providing guidance for the movement of the conical block 11. The expansion support assembly 12 forms a cylinder with an inner conical hole. The outer conical surface of the conical block 11 fits into the inner conical hole formed by the expansion support assembly 12. By tightening the bolt 9, the conical block 11 is driven to move axially downward along the connecting pin 8. The downward movement of the conical block 11 forces the expansion support assembly 12 to expand radially outward synchronously through its outer conical surface until it contacts the inner side of the large diameter of the double-pipe vent, thus achieving support.

[0010] The expansion support assembly 12 consists of four quarter-cylinders that can be closed to form an inner conical hole that fits against the outer surface of the conical block 11. The outer surface of the cylinder is covered with a damping rubber layer, which increases friction and further reduces vibration. The outer surface of the expansion support assembly 12 has a fixing groove 13, in which a rubber O-ring is installed. The fixing groove 13 limits the rubber O-ring and effectively prevents it from moving. The rubber O-ring is used to constrain the radial position of the four sets of expansion support assemblies 12, preventing them from loosening, and adaptively expands and contracts radially with the four sets of expansion support assemblies 12. All of the above constitute a single-degree-of-freedom radius adjustment structure, forming a cylindrical coordinate system support system with radial and axial positions as control variables in terms of spatial positioning and movement.

[0011] The small-aperture support unit 1 includes a floating auxiliary support assembly 17, a lead screw and nut mechanism 18, a rotating rod 19, a height adjustment plate 20, a connecting rod and slider mechanism 21, and a guide mechanism 22. The height adjustment plate 20 has eight evenly distributed flat keyways along its circumference, which are threadedly connected to the upright of the lead screw and nut mechanism 18, allowing for axial movement along the upright. One end of the connecting rod and slider mechanism 21 is connected to the flat keyway of the height adjustment plate 20 via a flat key, and the other end is connected to the flat keyway at the end of the guide mechanism 22 via a flat key. This allows the axial movement of the height adjustment plate 20 to drive the connecting rod and slider mechanism 21 to extend and retract. The floating auxiliary support assembly 17 is connected to the slider of the guide mechanism 22 via a flat key. The radial movement of 21 causes the floating auxiliary support assembly 17 to retract; rotating the crossbar at the upper end of the screw nut mechanism 18 causes the screw nut mechanism 18 to drive the height adjustment plate 20 to move downward, causing the connecting rod slider mechanism 21 to push the floating auxiliary support assembly 17 outward, so that it contacts the inner side of the small diameter of the double-tube vent hood to achieve the supporting function; the floating auxiliary support assembly 17 is made of nylon rubber material, which increases friction and can further reduce vibration. All the above parts constitute a single degree of freedom height adjustment structure. Combined with the screw nut mechanism and the connecting rod slider mechanism, it forms a cylindrical coordinate system support system with radial position and axial position as control variables in terms of spatial positioning and movement.

[0012] The clamping unit 5 includes a clamping sleeving, a clamping bolt, a U-shaped retaining ring, a contour clamping block, and a retaining pin. The clamping sleeving has a T-shaped bottom that connects movably to the T-slot of the base plate 3. The top square block of the clamping sleeving has an internal thread that mates with the external thread on the clamping bolt. The U-shaped retaining ring has a threaded through hole at its top center that mates with the external thread of the clamping bolt, and a through hole on one side of its bottom for installing the retaining pin. The contour clamping block is designed according to the contour of the irregular part and is made of nylon material to optimize the dynamic characteristics of the workpiece. Its non-contact end has a pin hole that mates with the retaining pin. The external thread of the clamping sleeving connects to the internal thread of the clamping bolt. One end of the U-shaped retaining ring is connected to the thread of the clamping bolt, and the other end is connected to the contour clamping block via the retaining pin, forming a stable clamping mechanism.

[0013] The box bottom plate support unit 6 includes a telescopic support base and a contoured rubber support block. The telescopic support base is designed as a T-shaped structure and is movably connected to the T-shaped groove of the bottom plate 3. The telescopic part of the telescopic support base is a sleeve structure for adjusting the height. The contoured rubber support block is designed to fit the wedge surface of the bottom of the irregular cavity part, and the non-fitting surface has a square groove that matches the telescopic support base. The contoured rubber support block provides point support for the bottom of the box and is set in 3 groups in an inverted triangle arrangement of two on top and one on the bottom.

[0014] The box support unit 7 includes a T-shaped base, a support screw, and a contoured rubber support block. The T-shaped base has a T-shaped structure and is movably connected to the T-shaped groove of the base plate 3. The top has an internal thread that screws into the support screw. One end of the support screw has an external thread that mates with the threaded hole at the top of the T-shaped base, and the other end has an external thread that mates with the threaded hole at the non-contoured end of the contoured rubber support block. This serves to connect the T-shaped base and the contoured rubber support block. The length of the box support unit 7 can be changed by rotating the support screw according to different usage requirements. The contoured rubber support block is designed to resemble a ladder structure for the box structure of irregularly shaped, thin-walled cavities. The back of the ladder has a threaded hole of a certain depth that mates with the support screw.

[0015] Each support element of the floating auxiliary support assembly 17 has two rubber support blocks, and one is set at a 45-degree interval along the circular base, for a total of 8 support elements and 16 rubber support blocks.

[0016] The beneficial effects of this invention are as follows: This invention employs a support unit with varying aperture sizes that contacts the inner surface of the double-tube vent hood, ensuring absolute fit of each expansion support assembly and improving the overall rigidity of the irregularly shaped workpiece during processing. This effectively suppresses workpiece deformation and vibration, guaranteeing processing quality and precision. The damping rubber layer acts as a protective layer between the fixture and the irregularly shaped thin-walled part, preventing excessive clamping force from causing clamping deformation and damage. The box clamping unit, box base plate support, box support assembly, and contour support block can fully contact the box surface of the irregularly shaped thin-walled part, preventing displacement and vibration of the box portion during milling, thus ensuring processing quality and precision. By arranging displacement sensors and combining them with an improved Lagrange algorithm to reconstruct the surface contour of the irregularly shaped part, deformation during processing can be detected. Attached Figure Description

[0017] Figure 1 Schematic diagram of an aerospace-grade irregular thin-walled component;

[0018] Figure 2 This is a three-dimensional schematic diagram of the device of the present invention;

[0019] Figure 3 Schematic diagram of a large-diameter support unit;

[0020] Figure 4 A top view of the large-diameter support unit and a diagram showing the installation location and quantity of the expansion support components;

[0021] Figure 5 Schematic diagram of a small-diameter support unit;

[0022] Figure 6 A top view of the small-aperture support unit and a diagram showing the installation location and quantity of the floating auxiliary support components;

[0023] Figure 7 This is a schematic diagram of the exploded structure of a large-aperture support unit.

[0024] Figure 8 This is a schematic diagram of the aperture positioning unit structure;

[0025] Figure 9 This is a schematic diagram of the box clamping unit structure;

[0026] Figure 10 This is a schematic diagram of the support unit structure for the bottom plate of the enclosure;

[0027] In the diagram: 1. Small-diameter support unit, 2. Large-diameter support unit, 3. Base plate, 4. Diameter positioning unit, 5. Box clamping unit, 6. Box base plate support unit, 7. Box support unit, 8. Connecting pin, 9. Bolt, 10. Upper seat, 11. Conical block, 12. Expansion support assembly, 13. Fixing groove, 14. Base, 15. Connecting hole, 16. Bolt through hole, 17. Floating auxiliary support assembly, 18. Screw and nut mechanism, 19. Rotary rod, 20. Height adjustment plate, 21. Linkage slider mechanism, 22. Guide mechanism. Detailed Implementation

[0028] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings and technical solutions.

[0029] like Figure 2 As shown, a combined vibration damping and positioning fixture for machining aerospace irregular thin-walled parts includes a small-diameter support unit 1, a large-diameter support unit 2, a base plate 3, a diameter positioning unit 4, a box clamping unit 5, a box base plate support unit 6, and a box support unit 7. The small-diameter support unit 1 and the large-diameter support unit 2 are independent components. After the base plate 3, the diameter positioning unit 4, the box clamping unit 5, the box base plate support unit 6, and the box support unit 7 are assembled, they each independently support the inner wall of the double-tube vent. The aperture positioning unit 4 includes an upper positioning seat and a lower positioning seat, which are connected by bolts and rubber washers. The circular hole formed by the connection of the upper and lower positioning seats fits onto the outside of the slot of the double-pipe ventilation hood. The lower positioning seat is provided with a T-shaped structure that cooperates with the T-shaped slide groove of the base plate 3, so that the aperture positioning unit 4 is fixed on the base plate 3. The bottom structure of the box clamping unit 5, the box bottom support 6 and the box support unit 7 are all set as T-shaped structures, which are connected to the T-shaped slide groove on the base plate 3 by keyways. The three can only move in the T-shaped slide groove.

[0030] like Figure 3As shown, the large-diameter support unit 2 includes a connecting pin 8, a bolt 9, an upper seat 10, a conical block 11, an expansion support assembly 12, a fixing groove 13, a base 14, a connecting hole 15, and a bolt through hole 16. The upper seat 10 has two through pin holes symmetrically arranged on its left and right sides, and a larger bolt through hole in its center. The conical block 11 is a truncated cone with a bolt through hole at its top center. The bolt 9 is threadedly connected to the bolt through holes of the upper seat 10 and the conical block 11. The expansion support assembly 12 consists of four quarter-cylinders, each with a pin hole at the center of each pair of mating seams to mate with the connecting pin. Pin 8 passes through the upper seat 10, expansion support assembly 12 and base 14 from top to bottom, realizing the axial connection of the three and providing guidance for the movement of the conical block 11. The expansion support assembly 12 forms a cylinder with an inner conical hole. The outer conical surface of the conical block 11 fits with the inner conical hole formed by the expansion support assembly 12. By tightening the bolt 9, the conical block 11 is driven to move axially downward along the connecting pin 8. The downward movement of the conical block 11 forces the expansion support assembly 12 to expand radially outward in sync with its outer conical surface until it contacts the inner side of the large diameter of the double-pipe vent, thus achieving support. The expansion support assembly 12 consists of four quarter-cylinders that can be closed to form an inner conical hole that fits against the outer surface of the conical block 11. The outer surface of the cylinder is covered with a damping rubber layer, which increases friction and further reduces vibration. The outer surface of the expansion support assembly 12 has a fixing groove 13, in which a rubber O-ring is installed. The fixing groove 13 limits the rubber O-ring and effectively prevents it from moving. The rubber O-ring is used to constrain the radial position of the four sets of expansion support assemblies 12, preventing them from loosening, and adaptively expands and contracts radially with the four sets of expansion support assemblies 12. All of the above constitute a single-degree-of-freedom radius adjustment structure, forming a cylindrical coordinate system support system with radial and axial positions as control variables in terms of spatial positioning and movement.

[0031] Furthermore, rubber O-rings are made of natural rubber, nylon cloth, and steel wire. Rubber O-rings not only have good elasticity but also good tensile strength, so their lifespan is relatively longer. This effectively reduces the number of times rubber O-rings need to be replaced and maintained, saving users' operating costs and making them more practical and convenient. Ring springs can also be used to replace rubber O-rings, achieving the same effect.

[0032] like Figure 5As shown, the small-diameter support unit 1 includes a floating auxiliary support assembly 17, a lead screw and nut mechanism 18, a rotating rod 19, a height adjustment plate 20, a connecting rod and slider mechanism 21, and a guide mechanism 22. The height adjustment plate 20 has eight evenly distributed flat keyways along its circumference, which are threadedly connected to the upright of the lead screw and nut mechanism 18, allowing for axial movement along the upright. One end of the connecting rod and slider mechanism 21 is connected to the flat keyway of the height adjustment plate 20 via a flat key, and the other end is connected to the flat keyway at the end of the guide mechanism 22 via a flat key. This allows the axial movement of the height adjustment plate 20 to drive the connecting rod and slider mechanism 21 to extend and retract. The floating auxiliary support assembly 17 is connected to the slider of the guide mechanism 22 via a flat key. The radial movement of mechanism 21 causes the floating auxiliary support assembly 17 to retract; rotating the crossbar at the upper end of the screw nut mechanism 18 causes the screw nut mechanism 18 to drive the height adjustment plate 20 to move downward, causing the connecting rod slider mechanism 21 to push the floating auxiliary support assembly 17 outward, so that it contacts the inner side of the small diameter of the double-tube vent hood to achieve the supporting function; the floating auxiliary support assembly 17 is made of nylon rubber material, which increases friction and can further reduce vibration. All the above parts constitute a single degree of freedom height adjustment structure. Combined with the screw nut mechanism and the connecting rod slider mechanism, it forms a cylindrical coordinate system support system with radial position and axial position as control variables in terms of spatial positioning and movement.

[0033] like Figure 6 As shown, each support element of the floating auxiliary support assembly 17 has two rubber support blocks, and one is set at a 45-degree interval along the base, for a total of 8 support elements and 16 rubber support blocks.

[0034] Through the above specific implementation methods, the technical solution in this application achieves the following effects: In use, firstly, the double-pipe ventilation hood of the irregular part is fixed to the base plate 3 using bolts and rubber washers through the slot aperture positioning unit 4. Then, the bottom of the irregular part box is adjusted and fixed to another base plate through three sets of box base plate supports 6. Then, the box support unit 7 is adjusted to fix the box clamping unit 5 to the irregular part box, which plays a clamping role. The box base plate support unit 6 is adjusted in the high-precision slot according to different irregular parts. Finally, the large-diameter support unit 2 is placed into the double-pipe ventilation hood of the irregular part. At a suitable position at the large port of the air hood, the matching hexagonal screw 9 drives the conical block to press down on the expansion support assembly 12. The expansion support assembly 12 is forced outward and expands until it contacts the inner wall of the double-pipe air hood. Finally, the small-diameter support unit 1 is placed at a suitable position at the small port of the irregular double-pipe air hood. Rotating the screw rod 19 causes the lead screw nut mechanism 18 to move downward, driving the connecting rod slider mechanism 21 to push outward until the floating auxiliary support assembly 17 on the slider contacts the inner wall of the small-diameter hole, which plays a supporting and vibration-damping role, reducing vibration during milling and improving machining accuracy.

[0035] Without causing conflict, those skilled in the art can freely combine and use the above-mentioned additional technical features.

[0036] It should be noted that the above description is only an embodiment of the present invention and is not intended to limit the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc., within the equivalent meaning and scope of the claims of the present invention should be included within the protection scope of the present invention.

Claims

1. A combined vibration damping and positioning fixture for machining irregularly shaped thin-walled aerospace parts, characterized in that, The combined vibration damping and positioning fixture includes a small-diameter support unit (1), a large-diameter support unit (2), a base plate (3), a diameter positioning unit (4), a box clamping unit (5), a box base plate support unit (6), and a box support unit (7). The small-diameter support unit (1) and the large-diameter support unit (2) are independent components. After the base plate (3), the diameter positioning unit (4), the box clamping unit (5), the box base plate support unit (6), and the box support unit (7) are assembled, they each support the inner wall of the double-pipe ventilation hood separately. The base plate (3) consists of two rotatably connected grooved clamp base plates that can adjust the angle of opening and closing, and can achieve an opening and closing angle of 0-180° according to different clamping methods; a T-shaped sliding groove is opened on the upper surface of the base plate (3); The aperture positioning unit (4) includes an upper positioning seat and a lower positioning seat, which are connected by bolts and rubber washers. The circular hole formed after the upper and lower positioning seats are connected fits the outside of the slot of the double-pipe ventilation hood. The lower positioning seat is provided with a T-shaped structure that matches the T-shaped groove of the base plate (3), so that the aperture positioning unit (4) is fixed on the base plate (3). The bottom structures of the box clamping unit (5), the box bottom support (6) and the box support unit (7) are all set as T-shaped structures, which are connected to the T-shaped slide groove on the base plate (3) through keyways. The three can only move in the T-shaped slide groove.

2. The combined vibration damping and positioning fixture according to claim 1, characterized in that, The large-diameter support unit (2) includes a connecting pin (8), a bolt (9), an upper seat (10), a conical block (11), an expansion support assembly (12), a fixing groove (13), a base (14), a connecting hole (15), and a bolt through hole (16). The upper seat (10) has two through pin holes symmetrically opened on the left and right sides and a larger bolt through hole in the center. The conical block (11) is a truncated cone with a bolt through hole in the center of the top. The bolt (9) is threadedly connected to the bolt through holes of the upper seat (10) and the conical block (11). The expansion support assembly (12) consists of four quarter-cylinders with pin holes in the center of each pair of mating seams that mate with the connecting pin. The connecting pin (8) passes through the upper seat (10), the expansion support assembly (12) and the base (14) from top to bottom, realizing the axial connection of the three and providing guidance for the movement of the conical block (11). The expansion support assembly (12) forms a cylinder with an inner conical hole. The outer conical surface of the conical block (11) fits with the inner conical hole formed by the expansion support assembly (12). By tightening the bolt (9), the conical block (11) is driven to move axially downward along the connecting pin (8). The downward movement of the conical block (11) forces the expansion support assembly (12) to expand outward in the radial direction in sync through its outer conical surface until it contacts the inner side of the large diameter of the double-pipe ventilation hood, thus achieving support.

3. The combined vibration damping and positioning fixture according to claim 2, characterized in that, The expansion support assembly (12) consists of four quarter-cylinders that can be enclosed to form an inner conical hole that fits against the outer surface of the conical block (11). The outer surface of the cylinder is covered with a damping rubber layer, which increases friction and further reduces vibration. The outer surface of the expansion support assembly (12) has a fixing groove (13), and the rubber O-ring is installed in the fixing groove (13). The fixing groove (13) limits the rubber O-ring and effectively prevents it from moving. The rubber O-ring is used to constrain the radial position of the four sets of expansion support assemblies (12) to prevent them from loosening, and adaptively expands and contracts radially with the four sets of expansion support assemblies (12). All of the above constitute a single-degree-of-freedom radius adjustment structure, forming a cylindrical coordinate system support system with radial and axial positions as control variables in terms of spatial positioning and movement.

4. The combined vibration damping and positioning fixture according to claim 1, characterized in that, The small-diameter support unit (1) includes a floating auxiliary support assembly (17), a lead screw and nut mechanism (18), a rotating rod (19), a height adjustment plate (20), a connecting rod and slider mechanism (21), and a guide mechanism (22). The height adjustment plate (20) has eight evenly distributed flat keyways along its circumference, which are threadedly connected to the upright of the lead screw and nut mechanism (18) to allow for axial movement along the upright. One end of the connecting rod and slider mechanism (21) is connected to the flat keyway of the height adjustment plate (20) via a flat key, and the other end is connected to the flat keyway at the end of the guide mechanism (22) via a flat key. This allows the axial movement of the height adjustment plate (20) to drive the connecting rod and slider mechanism (21) to retract and extend. The floating auxiliary support assembly (17) and the guide mechanism (22) are connected via a flat keyway. The radial movement of the connecting rod and slider mechanism (21) causes the floating auxiliary support assembly (17) to retract and expand; the horizontal bar at the upper end of the screw nut mechanism (18) is rotated, causing the screw nut mechanism (18) to drive the height adjustment plate (20) to move downward, causing the connecting rod and slider mechanism (21) to push the floating auxiliary support assembly (17) outward, so that it contacts the inner side of the small diameter of the double-tube vent hood to achieve the supporting effect; the floating auxiliary support assembly (17) is made of nylon rubber material, which increases friction and can further reduce vibration. All the above parts constitute a single degree of freedom height adjustment structure. Combined with the screw nut mechanism and the connecting rod and slider mechanism, it forms a cylindrical coordinate system support system with radial position and axial position as control variables in terms of spatial positioning and movement.

5. The combined vibration damping and positioning fixture according to claim 1, characterized in that, The box clamping unit (5) includes a clamping screw sleeve, a clamping bolt, a U-shaped fixing ring, a contour clamping block, and a fixing pin. The bottom of the clamping screw sleeve has a T-shaped structure and is movably connected to the T-shaped groove of the base plate (3). The square block at the top of the clamping screw sleeve has an internal thread that mates with the external thread on the clamping bolt. The top center of the U-shaped fixing ring has a threaded through hole that mates with the external thread of the clamping bolt, and a through hole on one side of the bottom for installing the fixing pin. The contour clamping block is designed according to the contour of the irregular part and is made of nylon material to optimize the dynamic characteristics of the workpiece. Its non-contact end has a pin hole that mates with the fixing pin. The external thread of the clamping screw sleeve is connected to the internal thread of the clamping bolt. One end of the U-shaped fixing ring is connected to the thread of the clamping bolt, and the other end is connected to the contour clamping block through the fixing pin, forming a stable clamping mechanism.

6. The combined vibration damping and positioning fixture according to claim 1, characterized in that, The box bottom plate support unit (6) includes a telescopic support base and a contoured rubber support block. The telescopic support base is designed as a T-shaped structure and is movably connected to the T-shaped groove of the bottom plate (3). The telescopic part of the telescopic support base is a sleeve structure for adjusting the height. The contoured rubber support block is designed to fit the wedge surface of the bottom of the irregular cavity part. The non-fitting surface has a square groove that matches the telescopic support base. The contoured rubber support block provides point support to the bottom of the box and is set in 3 groups arranged in an inverted triangle with two on top and one on the bottom.

7. The combined vibration damping and positioning fixture according to claim 1, characterized in that, The box support unit (7) includes a T-shaped base, a support screw, and a contoured rubber support block. The T-shaped base is a T-shaped structure that is movably connected to the T-shaped groove of the base plate (3). The top has an internal thread that is screwed into the support screw. One end of the support screw has an external thread that mates with the threaded hole at the top of the T-shaped base, and the other end has an external thread that mates with the threaded hole at the non-contoured end of the contoured rubber support block. This serves to connect the T-shaped base and the contoured rubber support block. The length of the box support unit (7) can be changed by rotating the support screw according to different usage requirements. The contoured rubber support block is designed to resemble a ladder structure for the box structure of the irregular cavity thin-walled part. The back of the ladder has a threaded hole of a certain depth that mates with the support screw.

8. The combined vibration damping and positioning fixture according to claim 1, characterized in that, Each support element of the floating auxiliary support assembly (17) has two rubber support blocks, and one is set at a 45-degree interval along the circular base, for a total of 8 support elements and 16 rubber support blocks.

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