A fixture for irregularly shaped parts and its method of use

Abstract

This invention discloses a fixture for irregularly shaped parts and its usage method, belonging to the technical field of machining fixtures for mechanical workpieces. The fixture provided by this invention includes a chuck connecting rod, a fixed plate, a fixed base, and several movable chucks. The bottom surfaces of the fixed base and the movable chucks are located on the same plane. The fixed base is fixed to the machine tool worktable, and the movable chucks are used to fix the inner holes of the irregularly shaped parts. Utilizing the inherent regular features of the irregularly shaped parts as the clamping datum, the movable chucks tighten the inner holes, transforming the geometric center of the workpiece into a machining datum. This solves the technical bottleneck of difficulty in alignment and coordinate system establishment due to the lack of regular planes on the outer periphery of the parts, ensuring the accuracy and reliability of the machining datum. Through the coordinated design of the movable chucks and the fixed base, the workpiece is firmly suspended and fixed above the base, exposing multiple surfaces to be machined in a single clamping operation, effectively ensuring the machining accuracy of the key geometric tolerances of the parts.

Description

Technical Field

[0001] This invention relates to the field of mechanical workpiece machining fixtures, specifically to a fixture for irregularly shaped parts and its method of use. Background Technology

[0002] In the field of machining, tooling fixtures are core auxiliary equipment for ensuring the surface quality of machined parts and improving machining efficiency. Their structural design and adaptability directly determine the machining accuracy and production feasibility of irregularly shaped parts. Currently, for the machining of irregularly shaped parts, such as irregularly shaped structural parts with collinear centers but no edges parallel to the center line on the outer perimeter, non-planar bottom surfaces, and internal holes, the industry has not yet formed an efficient and precise clamping solution. The machining process faces multiple technical bottlenecks, the specific problems of which are as follows: In existing technologies, clamping irregularly shaped parts mainly relies on two traditional methods, but both have significant drawbacks: First, using a traditional vise for clamping is problematic because irregularly shaped parts lack parallel planes or regular surfaces that can serve as positioning references on their outer periphery. This makes it impossible to accurately align and clamp the workpiece using the vise's jaws, leading to difficulties in establishing a workpiece coordinate system. Positioning offsets easily occur during processing, directly affecting the flatness of the formed surface. Therefore, traditional vise clamping methods are completely unsuitable for such parts. Figure 1 and Figure 2 The workpiece shown has two circles whose centers are on the same horizontal line, but none of its outer contours are parallel to the center line, making it impossible to establish an accurate machining coordinate system by aligning the outer shape.

[0003] Secondly, the method of using a pressure plate for localized machining in sections requires fixing the workpiece in sections to the machine tool table using a pressure plate. However, irregularly shaped parts generally have uneven bottom surfaces, making it impossible for the pressure plate to form a stable fit with the bottom surface of the workpiece. A single clamping cannot cover the entire machining area, and the position of the pressure plate must be repeatedly moved and the clamping points adjusted to complete the overall machining of the part. During this process, the tool must be re-set after each adjustment of the pressure plate, and the secondary tool setting operation inevitably introduces positioning errors, making it difficult for the part's form and position tolerances (such as coaxiality and flatness) to meet the requirements of high-precision machining. At the same time, the repeated clamping and tool setting operations significantly increase machine tool downtime. If applied to mass production scenarios, this will significantly reduce production efficiency and cannot meet the needs of industrial mass production. Summary of the Invention

[0004] The purpose of this invention is to provide a fixture for irregularly shaped parts and a method for using it, so as to overcome the limitations of existing technologies for clamping irregularly shaped parts.

[0005] The present invention solves the above-mentioned technical problems through the following technical solution: This invention provides a clamp for irregularly shaped parts, including a chuck connecting rod, a fixing plate, a fixing base, and several movable chucks; The fixed base has a groove and a sliding groove running through the middle. One end of the chuck connecting rod is connected to the movable chuck, and the other end passes through the sliding groove to connect to the fixed plate. The fixed plate is set in the groove and fixedly connected to the fixed base. The end of the chuck connecting rod connected to the movable chuck is provided with a connecting rod step, which mates with the groove of the sliding groove to limit the longitudinal displacement of the chuck connecting rod. A center line is provided on the chuck connecting rod, which is perpendicular to the sliding direction of the sliding groove. The bottom surfaces of the fixed base and several movable chucks are located on the same plane. When machining irregularly shaped parts, the fixed base is fixed to the machine tool table, and the movable chucks are used to fix the inner holes of the irregularly shaped parts.

[0006] A further improvement of the present invention is that the number of movable chucks is determined according to the inner hole used for fixing the irregularly shaped part.

[0007] A further improvement of the present invention is that the movable chuck includes a chuck base, and the upper surface of the chuck base is provided with multiple chuck claws.

[0008] A further improvement of the present invention is that the claws are three or four.

[0009] A further improvement of the present invention is that the chuck base is provided with an adjustment hole for adjusting the displacement of the jaws in the diameter direction.

[0010] A further improvement of the present invention is that the side of the fixed base is provided with fixing bolt holes for fixing the fixed base to the machine tool worktable.

[0011] A further improvement of the present invention is that a scale is provided on the fixed base to control the distance between multiple movable chucks in accordance with the center line.

[0012] A further improvement of the present invention is that the fixed base is integrally cast from steel.

[0013] A further improvement of the present invention is that the fixing plate has threaded holes, and the fixing base is fixedly connected by screws.

[0014] The present invention also provides a method for using a fixture for irregularly shaped parts as described above, wherein the fixed base is aligned and fixed to the machine tool worktable; the fixed plate in the groove is slid to a suitable position, and the irregularly shaped part is locked by the moving chuck, and the fixed plate and the fixed base are fixedly connected; a machining coordinate system is set, the origin of which is the center of the moving chuck.

[0015] Compared with the prior art, the positive and progressive effects of the present invention are as follows: The fixture for irregularly shaped parts provided by this invention utilizes the inherent regular features of the irregularly shaped parts as the clamping reference. The bottom surfaces of the fixed base and all the movable chucks are located on the same plane and are closely attached to the machine tool table. Combined with the tight fit of the connecting rod step and the sliding groove, the movable chuck supports the inner hole, transforming the geometric center of the workpiece into the machining reference. This solves the technical bottleneck of being unable to align the workpiece and establishing a coordinate system due to the lack of parallel edges or regular planes on the outer periphery of the part, ensuring the accuracy and reliability of the machining reference. Through the coordinated design of the movable chuck and the fixed base, the workpiece is firmly suspended and fixed above the base. Multiple surfaces to be machined can be exposed in one clamping, avoiding the multiple re-clamping and tool setting operations required by the repeated movement of the pressure plate and the processing of different areas in the traditional reverse pressure plate method. This eliminates the cumulative positioning error introduced by the secondary tool setting and effectively ensures the machining accuracy of the key geometric tolerances of the part.

[0016] Furthermore, by setting up multiple movable chucks corresponding to the number of inner holes in the workpiece, each key inner hole of the workpiece can become an independent positioning and clamping reference, which enhances positioning stability, effectively overcomes the shortcomings of clamping at a few points when dealing with complex cutting forces, and ensures the realization of high-precision machining. Attached Figure Description

[0017] The accompanying drawings are provided to further understand the invention and constitute a part of this invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0018] Figure 1 The following are the three views of an irregularly shaped part: Figure (a) is the front view, Figure (b) is the side view, and Figure (c) is the top view. Figure 2 for Figure 1 A schematic diagram of the overall structure of the irregularly shaped part; Figure 3 This is a schematic diagram of a clamping structure for irregularly shaped parts according to the present invention. Figure 1 ; Figure 4 This is a schematic diagram of a clamping structure for irregularly shaped parts according to the present invention. Figure 2 ; Figure 5 Figure (a) is a rear view, Figure (b) is a front view, Figure (c) is a top view, and Figure (d) is a side view. Figure 6 The following are three views of the fixed base of the present invention: Figure (a) is the front view, Figure (b) is the side view, and Figure (c) is the top view. Figure 7 This is a schematic diagram of the structure of the fixed base of the present invention; Figure 8 This is a schematic diagram of the structure of the movable chuck of the present invention; Figure 9 The following are three views of the movable chuck of the present invention: Figure (a) is the front view, Figure (b) is the side view, and Figure (c) is the top view. Figure 10 This is a schematic diagram illustrating the use of a fixture for irregularly shaped parts according to the present invention; Figure 11 for Figure 10 The three views are shown in Figure (a), which is the front view, Figure (b), which is the left view, and Figure (c), which is the top view.

[0019] The components include: 1. Fixed base; 2. Fixed bolt holes; 3. Scale; 4. Sliding groove; 5. Groove; 6. Chuck base; 7. Chuck jaws; 8. Adjustment hole; 9. Chuck connecting rod; 10. Center line; 11. Connecting rod step; 12. Fixing plate; 13. Threaded hole; 14. Screw; 15. Bolt; 16. Irregularly shaped parts; 17. Machine tool worktable; 18. Machine tool spindle box; 19. Cutting tool. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0021] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0022] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0023] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, they are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0024] Furthermore, it should be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. This is an explanation of the present invention and not a limitation thereof.

[0026] See Figure 1 and Figure 2 The workpiece to be processed is an irregularly shaped part. Its internal structure can be considered as two circles, with their centers on the same horizontal line, but their bottom surfaces are not on the same plane. Furthermore, both circles contain stepped holes. Therefore, the upper and lower surfaces of this part must be processed separately. This invention designs a fixture for this type of part, which uses two chucks to clamp or open the inner circle of the part, allowing for the processing of the required areas on the upper surface. This reduces the number of clamping operations, minimizes errors caused by repeated clamping and tool setting, and ensures the part's form and position tolerances.

[0027] The present invention provides a clamp for irregularly shaped parts, including a chuck connecting rod 9, a fixing plate 12, a fixing base 1, and a plurality of movable chucks; The fixed base 1 has a groove 5 and a sliding groove 4 that passes through the middle. One end of the chuck connecting rod 9 is connected to the movable chuck, and the other end passes through the sliding groove 4 and connects to the fixed plate 12. The fixed plate 12 is set in the groove 5 and is fixedly connected to the fixed base 1. The end of the chuck connecting rod 9 that is connected to the movable chuck is provided with a connecting rod step 11. The connecting rod step 11 is engaged with the groove of the sliding groove 4 to limit the longitudinal displacement of the chuck connecting rod 9. A center line 10 is provided on the chuck connecting rod 9. The center line 10 is perpendicular to the sliding direction of the sliding groove 4. The bottom surfaces of the fixed base 1 and several movable chucks are located on the same plane. When machining irregularly shaped parts 16, the fixed base 1 is fixed to the machine tool worktable 17, and the movable chucks are used to fix the inner hole of the irregularly shaped parts 16.

[0028] Using the inherent regular features of the irregularly shaped part 16 as the clamping datum, the bottom surfaces of the fixed base 1 and all the movable chucks are located on the same plane and are closely attached to the machine tool table 17. Combined with the tight fit between the connecting rod step 11 and the sliding groove 4, the inner hole is supported by the movable chuck, and the internal geometric center of the workpiece is transformed into the machining datum. This solves the technical bottleneck of being unable to align and establish a coordinate system due to the lack of parallel edges or regular planes on the outer periphery of the part, ensuring the accuracy and reliability of the machining datum. Through the collaborative design of the movable chuck and the fixed base 1, the workpiece is firmly suspended and fixed above the base. Multiple surfaces to be machined can be exposed in one clamping, avoiding the multiple re-clamping and tool setting operations required by the repeated movement of the pressure plate and the processing of different areas in the traditional reverse pressure plate method. This eliminates the cumulative positioning error introduced by the secondary tool setting and effectively ensures the machining accuracy of the key geometric tolerances of the part.

[0029] Preferably, the number of movable chucks is determined based on the inner hole used for fixing the irregularly shaped part 16.

[0030] By setting up multiple movable chucks corresponding to the number of inner holes in the workpiece, each critical inner hole of the workpiece can become an independent positioning and clamping reference, which enhances positioning stability, effectively overcomes the shortcomings of clamping at a few points when dealing with complex cutting forces, and ensures the realization of high-precision machining.

[0031] Preferably, the movable chuck includes a chuck base 6, and a plurality of chuck claws 7 are provided on the upper surface of the chuck base 6.

[0032] Preferably, there are three or four claws 7.

[0033] By setting multiple jaws 7 on the chuck base 6 of each movable chuck, a self-centering clamping mechanism is formed. It can accurately fit the contour surface of the inner hole or cavity of the workpiece through the synchronous radial movement of the jaws 7, thereby realizing automatic centering and clamping based on the regular features of the workpiece.

[0034] Preferably, the chuck base 6 is provided with an adjustment hole 8 for adjusting the displacement of the jaws 7 in the diameter direction.

[0035] By providing an adjustment hole 8 on the chuck base 6, a direct interface for precisely controlling the radial displacement of the jaws 7 is provided, making the operation of the clamp more flexible and convenient.

[0036] See Figure 6 and Figure 7 Preferably, the fixed base 1 is provided with a fixing bolt hole 2 on its side for fixing the fixed base 1 to the machine tool worktable 17.

[0037] This fixing method is simple and reliable to operate, and the fixture can be installed and fixed using standard bolt 15 components. Once the initial alignment and tightening are completed, the position of the fixture on the machine tool worktable 17 is determined. In batch processing, even if the fixture is disassembled for maintenance or other reasons, the original positioning accuracy can be quickly restored during reinstallation by using the fixing bolt holes 2 and the base reference, thus shortening the production preparation and tooling change time.

[0038] Preferably, the fixed base 1 is provided with a scale 3, which is used to control the distance between multiple movable chucks in conjunction with the center line 10.

[0039] By setting a scale 3 on the fixed base 1 and cooperating with the center line 10 on the chuck connecting rod 9, a visual and precise reference is provided for adjusting the center distance between multiple moving chucks. The scale value can be read directly, and the chuck can be quickly and accurately positioned to the theoretically calculated distance.

[0040] Preferably, the fixed base 1 is integrally cast from steel.

[0041] This avoids the inherent problems of internal stress, connection gaps, and weak points that arise from welding or bolting, giving the fixed base 1 extremely high rigidity and resistance to bending and torsion.

[0042] Preferably, the fixing plate 12 has a threaded hole 13, and the fixing base 1 is fixedly connected by screws 14.

[0043] It can effectively resist the transverse cutting force generated during machining and prevent the chuck from shifting during machining.

[0044] See Figure 10 and Figure 11 Based on the same inventive concept, the present invention also provides a method for using a fixture for irregularly shaped parts as described above, wherein the fixed base 1 is aligned and fixed to the machine tool worktable 17; the fixed plate 12 in the groove 5 is slid to a suitable position, and the irregularly shaped part 16 is locked by the moving chuck, and the fixed plate 12 and the fixed base 1 are fixedly connected; the machining coordinate system is set, and the origin of the coordinate system is the center of the moving chuck.

[0045] See Figures 3-5 This embodiment discloses a clamp for irregularly shaped parts, including a fixed base 1 and two movable chucks; the fixed base 1 is provided with fixing bolt holes 2; the fixing bolt holes 2 are provided with bolts 15 and nuts; the fixed base 1 is provided with sliding grooves 4; the fixed base 1 is provided with scales 3; the back of the fixed base 1 is provided with grooves 5; the movable chucks are provided with chuck bases 6; the chuck bases 6 are provided with jaws 7, which can be three-jawed or four-jawed; the chuck bases 6 are provided with jaw adjustment holes 8, through which the diameter of the jaws 7 is controlled; the movable chucks are provided with chuck connecting rods 9, which cooperate with the sliding grooves 4 of the fixed base 1 to realize the chuck. The chuck connecting rod 9 is equipped with a center line 10, which cooperates with the scale 3 of the fixed base 1 to achieve precise control of the center distance of the jaws 7; the chuck connecting rod 9 is equipped with a connecting rod step 11, which cooperates with the groove 4 of the sliding groove of the fixed base 1 to first ensure the position of the chuck is fixed, and secondly to ensure the perpendicularity of the chuck connecting rod 9 to the fixed base 1; the chuck connecting rod 9 is equipped with a fixing plate 12, which slides in the groove 5 on the back of the fixed base 1, and the fixing plate 12 cooperates with the connecting rod step 11 to fix the position of the chuck; the fixing plate 12 is equipped with a threaded hole 13; the threaded hole 13 is equipped with a screw 14, which cooperates with the connecting rod step 11 to lock the position of the chuck.

[0046] See Figure 8 and Figure 9This embodiment discloses a fixture for irregularly shaped parts. The fixture is designed with a fixed base 1 and a chuck connected by a chuck connecting rod 9. The frame of the fixed base 1 is integrally cast from steel, giving it strong rigidity and making it resistant to deformation. The front plane of the fixed base 1 is parallel to the transverse center line 10 of the two chucks. Therefore, before clamping the workpiece, the front of the fixed base 1 is aligned, and then the fixed base 1 is fixed to the machine tool table 17 with bolts 15 and nuts. This ensures that the center of the two chucks is also parallel to a certain machining axis of the machine tool spindle box 18. The bottom surfaces of the chuck base 6 and the fixed base 1 are on the same plane, both of which are in close contact with the machine tool table 17. The workpiece is firmly fixed on the chuck, and none of the three are suspended. This effectively resists the cutting force and vibration generated during processing, improving the overall device's resistance to deformation. It is especially suitable for precision machining of irregularly shaped parts. The chuck connecting rod 9 and the sliding groove 4 are tightly fitted together. The step of the chuck connecting rod 9 and the groove opening of the sliding groove 4 form a lateral movement guide fit, keeping the chuck connecting rod 9 and the fixed base 1 relatively perpendicular. This achieves linear motion control of the chuck, eliminates positioning deviation caused by the gap between the two chucks, and significantly improves the repeatability of positioning for irregularly shaped parts. The chuck jaws 7 are higher than the top surface of the fixed base 1, and there is a certain distance between the chuck and the fixed base 1 in the longitudinal direction. This design eliminates the problem of interference between irregularly shaped workpieces and the fixed base 1 when clamping them. The center of the chuck connecting rod 9 is on the same center line as the chuck and jaws 7. The center line 10 of the jaws 7 is matched with the scale 3 of the fixed base 1. After accurately adjusting the distance between the two chucks, the chuck is locked by the screws 14 of the fixed plate 12, ensuring the consistency of workpiece dimensions during mass production. The chuck jaws 7, acting as independent driving elements, are converted into diametrical displacement via the rotation adjustment hole 8. The operating torque is controllable and the adjustment range is precise. Furthermore, the jaws 7 offer flexible workpiece clamping; they can open to support the inner hole of the workpiece for fixation, or the inner side of the jaws 7 can clamp the outer circle of the workpiece, significantly improving clamping efficiency while reducing manual operation difficulty and labor intensity. The modular design of the fixed base 1 and movable chuck allows for quick adaptation to the processing needs of irregularly shaped parts of different sizes by changing the specifications of the fixed base 1, chuck, or the number of jaws 7, improving equipment versatility and production flexibility.

[0047] See Figure 10 and Figure 11In operation, the fixed base 1 is first aligned with the machine tool, and then fixed to the machining platform (i.e., the machine tool worktable 17) of the machine tool through the fixing bolt holes 2. The operator adjusts the center distance of the two chucks according to the center distance of the two holes of the workpiece to be processed, and then locks the chuck position with the screws 14 of the fixing plate 12. By rotating the adjustment hole 8, the jaws 7 clamp the stepped circle of the workpiece or open the inner circle of the workpiece, firmly fixing the workpiece on the chuck. After the workpiece is fixed, the workpiece coordinate system for machining needs to be set for the machine tool. At this time, the origin of the coordinate system can be set at the center of the chuck. Since the distance between the two chucks has been locked and will not change, when flipping to process the bottom surface, the two circles of the workpiece are still at the same center, ensuring the coaxiality of the two circles. Therefore, this invention not only ensures the form and position tolerances of the workpiece after forming, but also improves the quality and efficiency of machining, as well as the cost control of the cutting tool 19.

[0048] The fixture for irregularly shaped parts provided by this invention can be applied on CNC milling machines.

[0049] Finally, it should be noted that the embodiments listed above are merely one or more specific manifestations of the technical solution of this invention. Their purpose is to clearly illustrate the concept, principle, and application of this invention through specific examples, and is by no means intended to limit the scope of protection of this invention to these specific embodiments. In fact, the true value of this invention lies in its proposed technical ideas and innovations, rather than its manifestations or implementation methods.

[0050] For those skilled in the art, after thoroughly reading and understanding the technical solution of this invention, they are fully capable of making various changes, modifications, or equivalent substitutions to the specific implementation of the invention based on their own professional knowledge and skills. These changes may include, but are not limited to: adjusting the range of technical parameters, optimizing the algorithm flow to improve efficiency, and replacing some technical components to achieve better compatibility or reduce costs. As long as these modified technical solutions substantially retain the technical features claimed by the original invention, that is, they can still achieve the core functions and effects of this invention, then these changes should be considered to fall within the scope of protection of the pending claims of this invention.

[0051] Furthermore, with the continuous progress and development of technology, new technical means and methods are constantly emerging, which provides ample space for further improvement and perfection of this invention. Therefore, the scope of protection of this invention should also include reasonable and foresightful improvements and extensions based on existing technology. As long as these improvements and extensions do not depart from the basic principles and core concepts of this invention, they should be considered equivalents of this invention and are equally protected by patent rights.

Claims

1. A clamp for irregularly shaped parts, characterized in that, Includes a chuck connecting rod (9), a fixing plate (12), a fixing base (1), and several movable chucks; The fixed base (1) has a groove (5) and a sliding groove (4) that runs through the middle. One end of the chuck connecting rod (9) is connected to the movable chuck, and the other end passes through the sliding groove (4) to connect to the fixed plate (12). The fixed plate (12) is set in the groove (5) and is fixedly connected to the fixed base (1). The end of the chuck connecting rod (9) connected to the movable chuck is provided with a connecting rod step (11). The connecting rod step (11) is matched with the groove of the sliding groove (4) to limit the longitudinal displacement of the chuck connecting rod (9). A center line (10) is provided on the chuck connecting rod (9). The center line (10) is perpendicular to the sliding direction of the sliding groove (4). The bottom surfaces of the fixed base (1) and several movable chucks are located on the same plane. When machining irregularly shaped parts (16), the fixed base (1) is fixed to the machine tool worktable (17), and the movable chuck is used to fix the inner hole of the irregularly shaped parts (16).

2. A fixture for irregularly shaped parts according to claim 1, characterized in that, The number of movable chucks is determined based on the inner hole used for fixing the irregularly shaped part (16).

3. A fixture for irregularly shaped parts according to claim 1, characterized in that, The movable chuck includes a chuck base (6), and the upper surface of the chuck base (6) is provided with multiple chuck claws (7).

4. A fixture for irregularly shaped parts according to claim 3, characterized in that, The chucks (7) are three or four.

5. A fixture for irregularly shaped parts according to claim 3, characterized in that, The chuck base (6) is provided with an adjustment hole (8) for adjusting the displacement of the jaws (7) in the diameter direction.

6. A fixture for irregularly shaped parts according to claim 1, characterized in that, The fixed base (1) has a fixing bolt hole (2) on its side, which is used to fix the fixed base (1) to the machine tool worktable (17).

7. A fixture for irregularly shaped parts according to claim 1, characterized in that, A scale (3) is provided on the fixed base (1) to coordinate with the center line (10) and control the distance between multiple moving chucks.

8. A fixture for irregularly shaped parts according to claim 1, characterized in that, The fixed base (1) is made of steel integral casting.

9. A fixture for irregularly shaped parts according to claim 1, characterized in that, The fixing plate (12) has a threaded hole (13) and is fixedly connected to the fixing base (1) by screws (14).

10. The method of using a fixture for irregularly shaped parts as described in any one of claims 1 to 9, characterized in that, Align and fix the fixed base (1) to the machine tool worktable (17); slide the fixed plate (12) in the groove (5) to a suitable position, and lock the irregular part (16) by moving the chuck, and fix the fixed plate (12) and the fixed base (1) in place; set the machining coordinate system, with the origin of the coordinate system being the center of the moving chuck.

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