Five-axis machining tooling for small batch complex housing

Abstract

The application belongs to a supporting tool, and aims at the technical problems that the cost is high and the machining effect is easily affected by interference in the machining process when a small-batch complex shell is machined by means of a five-axis equipment, and provides a five-axis machining tool for small-batch complex shells, which comprises a first fixing seat and a second fixing seat, the mounting hole on the first fixing seat is connected with the process bottom plate of the five-axis bed surface through a first connecting piece, the mounting hole on the second fixing seat is connected with the process table of the shell to be machined through a second connecting piece, a positioning boss is arranged on the top of the second fixing seat and is used for matching and positioning with the process table of the shell to be machined, so as to ensure the repeated positioning accuracy and clamping strength, and at the same time, the five-axis machining of the five surfaces of the shell can be met, and interference can be avoided to the maximum extent.

Description

Technical Field

[0001] This application pertains to a type of support tooling, specifically relating to a five-axis machining tooling for small-batch complex shells. Background Technology

[0002] Some components have complex housing structures that significantly impact the overall quality of the structure. Therefore, the optimal machining process for complex housings is to employ a combination of process concentration, five-axis machining, and CNC turning, leveraging the precision of the five-axis equipment to ensure accurate machining results for both local and external dimensions.

[0003] However, in actual processing, if a mature zero-point quick-change system is used for processing small batches of shells, the cost is high, and interference is prone to occur during five-axis machining, affecting the processing effect of the shells. Summary of the Invention

[0004] This application addresses the technical problems of high cost and easy interference affecting the processing effect when machining small batches of complex shells using five-axis equipment, and provides a five-axis machining fixture for small batches of complex shells.

[0005] To achieve the above objectives, this application adopts the following technical solution: This application proposes a five-axis machining fixture for small-batch complex shells, including a first fixed base and a second fixed base; The second fixing seat is fixedly installed on the first fixing seat; Both the first fixed base and the second fixed base are provided with mounting holes; the mounting holes on the first fixed base are connected to the process base plate of the five-axis bed through a first connector; the mounting holes on the second fixed base are connected to the process table of the shell to be processed through a second connector. The second fixing seat has a positioning boss on its top, which is used to match and position the shell to be processed on the process table.

[0006] Furthermore, both the first and second fixed seats are provided with positioning holes; The positioning holes on the first fixed seat are positioned with the process base plate of the five-axis bed through the first positioning member; the positioning holes on the second fixed seat are positioned with the process table of the housing to be processed through the second connecting member.

[0007] Furthermore, the mounting hole is a threaded hole, and the positioning hole is a pin hole.

[0008] Furthermore, the first fixing base includes a chassis and a columnar clearance portion; The clearance part is fixed to the chassis, and the thickness of the clearance part is less than the diameter of the chassis. Clearance space is formed on both sides of the clearance part on the chassis. The second fixing seat is fixed to the top of the clearance part.

[0009] Furthermore, the chassis and the avoidance section are an integral structure.

[0010] Furthermore, the second fixing base is columnar; The second fixing seat is arranged perpendicularly to the clearance part.

[0011] Furthermore, the second fixing base is in the shape of a cuboid; The two ends of the second fixing seat extend above the clearance space.

[0012] Furthermore, the second fixing base is provided with two sets of mounting holes and positioning holes, both sets of mounting holes and positioning holes are located above the clearance space; The positioning boss is located between the two sets of mounting holes and positioning holes.

[0013] Furthermore, the second fixing base has a set of two mounting holes and a set of one positioning hole; The four mounting holes are located at the four corners of the second fixing base, and the two positioning holes are located between the two mounting holes in a set.

[0014] Furthermore, the first fixing base has four mounting holes and two positioning holes; The first fixing base has two mounting holes on each side of the clearance part, and the two positioning holes on the first fixing base are both located below the clearance part.

[0015] Compared with the prior art, this application has the following beneficial effects: This application proposes a five-axis machining fixture for small-batch complex shells, including a first fixed base and a second fixed base. The mounting holes on the first fixed base are connected to the process base plate of the five-axis machining bed via a first connecting piece. The mounting holes on the second fixed base are connected to the process table of the shell to be machined via a second connecting piece. A positioning boss is provided on the top of the second fixed base for matching and positioning with the process table of the shell to be machined. The entire fixture structure is simple, and the same fixture can be used for shells with similar structures, effectively reducing processing costs, shortening the production cycle, facilitating machining, and increasing the fixture's versatility. In small-batch production, positioning can be achieved through positioning holes and positioning pieces, ensuring repeatability and accuracy. During rough machining, the positioning boss provides sufficient support strength, reducing the impact of heavy cutting on the positioning piece and ensuring its repeated service life. Through the layered connection structure of the double fixed bases and mounting holes, combined with the clearance space design and positioning boss, the fixture system achieves miniaturization and high-precision positioning, offering advantages such as reduced tooling costs, reduced machining interference risks, improved positioning accuracy, and clamping stability. The overall structure ensures repeatability and clamping strength, while also enabling five-axis machining of the five surfaces of the housing, minimizing interference. Attached Figure Description

[0016] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the overall structure of the five-axis machining fixture for small-batch complex shells in this application; Figure 2 for Figure 1 A schematic diagram of the bottom structure; Figure 3 for Figure 1 A schematic diagram of the structure after the connectors and positioning components are installed. Figure 4 for Figure 3 A schematic diagram of the bottom structure; Figure 5 This is a schematic diagram of a housing being mounted on a five-axis machining fixture for small-batch complex housings, as described in this application. Figure 6 This is a schematic diagram of another type of housing installed on a five-axis machining fixture for small-batch complex housings in this application.

[0018] Wherein: 1-first fixed seat, 101-chassis, 102-avoidance part, 2-second fixed seat, 3-mounting hole, 4-positioning hole, 5-positioning boss, 6-first connector, 7-second connector, 8-first positioning component, 9-second positioning component. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0021] 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.

[0022] In the description of the embodiments of this application, 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 this application 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 on this application. In addition, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0024] In the description of the embodiments of this application, it should also 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 application according to the specific circumstances.

[0025] In industrial manufacturing, especially in the production of fluid control-related equipment, the valve body is a core component for realizing media on / off switching, flow regulation, or pressure control, and is widely used in key industries such as petrochemicals, water treatment, and energy. The valve body shell, as the basic load-bearing structure of the entire valve body, not only needs to provide precise installation space for internal components such as the valve core and seals, but its structural integrity and precision also directly determine the valve's sealing performance, operational stability, and service life. In practical applications, different industries have different performance requirements for the valve body shell. However, regardless of the application, the form and position tolerances and dimensional accuracy of the valve body shell are key factors affecting product quality and the stability of the entire valve system. If the shell machining accuracy is substandard, it may lead to problems such as valve leakage and switching jamming, thereby affecting the normal operation of the entire production system.

[0026] Given the stringent requirements for form and position tolerances and dimensional accuracy of valve bodies in various applications, achieving high-precision machining through a reasonable processing technology has become a widespread concern in the industry. In the machining process of the valve body, if traditional decentralized machining processes are used, i.e., machining different parts in steps using multiple machines, not only does this increase the number of workpiece transfers between machines, leading to low processing efficiency, but it may also cause positioning errors due to multiple clamping operations, making it difficult to guarantee the consistency of form and position tolerances and dimensional accuracy of different parts of the valve body. Furthermore, the valve body structure is relatively complex, typically containing multiple ports, main channels, and other critical components. The machining quality of these components directly affects the valve's assembly effect and performance. For example, insufficient machining accuracy of the main channel that mates with the sealing components can lead to poor sealing and media leakage. Therefore, to meet the high-precision machining requirements of the valve body, the industry urgently needs a machining process solution that can reduce the number of clamping operations and improve machining accuracy and efficiency.

[0027] To address the precision and efficiency issues in the aforementioned shell machining, the industry has gradually developed a machining process approach centered on process concentration. Process concentration refers to completing multiple machining processes of a workpiece on a single machine or at a single workstation, reducing positioning errors by minimizing the number of clamping operations and thus ensuring machining accuracy. In practice, a machining method typically employs a combination of five-axis machining centers and CNC lathes. Five-axis machining centers, with their multi-axis linkage capabilities, can perform one-time machining of complex shell shapes and multiple ports, utilizing their high precision to ensure that the dimensional accuracy and geometric tolerances of each port and shape meet requirements. For the main channels on the shell that involve sealing and assembly, due to their extremely high requirements for dimensional accuracy and surface roughness, CNC lathes can ensure the machining accuracy of the main channels through precise cutting parameter control, meeting the needs of subsequent seal assembly and media transportation. This process concentration machining process, combining five axes with CNC lathes, effectively solves the problems of low precision and poor efficiency in traditional decentralized machining processes, and has been widely used in large-batch shell machining production, significantly improving shell machining quality and production efficiency.

[0028] However, in the scenario of small-batch shell processing, the above-mentioned processing technology scheme with process concentration as the core still has obvious limitations, mainly reflected in the fact that the existing supporting tooling and fixture system is difficult to meet the requirements of economy and processing applicability. At present, the mature tooling and fixture systems in the industry mainly include the EROWA system and the zero-point quick change system. Although these two systems can cooperate with five-axis machining equipment and CNC lathes to ensure machining accuracy, there are two key problems in small-batch shell processing: (1) High cost. The equipment purchase cost and maintenance cost of the EROWA system and the zero-point quick change system are high. For small-batch production, the tooling cost allocated to each product increases significantly, reducing the market competitiveness of the product; (2) Insufficient applicability. The disk size of the two systems is large. When the five-axis machining equipment processes small-batch shells, the large disk is prone to interference with the tool, spindle and other components of the equipment, which not only affects the normal processing process, but may also damage the equipment and workpiece, increasing production risks. Therefore, in the scenario of small-batch shell processing, the existing processing technology and supporting tooling system based on process concentration cannot guarantee processing accuracy while taking into account economy and processing applicability. The industry still lacks an efficient, economical and high-precision processing solution for small-batch shell processing.

[0029] Based on the above, this application proposes a five-axis machining fixture for small-batch complex shells. The following is a detailed description of this application in conjunction with embodiments and accompanying drawings.

[0030] As a basic embodiment of the five-axis machining tooling for small-batch complex housings in this application, it may include a first fixed seat 1 and a second fixed seat 2.

[0031] The second fixed base 2 is fixedly mounted on the first fixed base 1. Both the first fixed base 1 and the second fixed base 2 are provided with mounting holes 3. The mounting holes 3 on the first fixed base 1 are connected to the process base plate of the five-axis machine bed via a first connecting piece 6. The mounting holes 3 on the second fixed base 2 are connected to the process table of the shell to be processed via a second connecting piece 7. The top of the second fixed base 2 is provided with a positioning boss 5 for matching and positioning with the process table of the shell to be processed.

[0032] The first fixed base 1 serves as the bottom support of the entire tooling. One end connects to the process base plate of the five-axis bed, and the other end supports the second fixed base 2, acting as a transition base between the tooling and the equipment to ensure that the tooling as a whole does not shift during processing. Its specific shape only needs to ensure a stable connection with the bed and effective support for the second fixed base 2. The material can be designed according to the weight requirements of the processing scenario, reducing the overall weight while ensuring strength. The second fixed base 2 connects directly to the process table of the shell to be processed. The positioning boss 5 on the top first completes the pre-positioning of the shell, and then it is fixed in conjunction with the mounting holes 3. This is a key component ensuring the positional accuracy of the shell during processing. The connection between the first fixed base 1 and the process base plate of the five-axis bed stably fixes the entire tooling on the five-axis bed, ensuring that the tooling will not shift due to cutting forces during processing, which is fundamental to ensuring processing accuracy. The connection between the second fixed base 2 and the process table of the shell to be processed fixes the shell to the second fixed base 2. Combined with the pre-positioning of the positioning boss 5, this ensures that the shell will not shake or shift during processing, guaranteeing the processing accuracy of each port and main channel of the shell. In practical applications, the connection between the second fixed seat 2 and the first fixed seat 1 can be achieved by welding, bolting, or other methods to ensure that the relative positions between the first fixed seat 1 and the second fixed seat 2 are fixed and to avoid relative displacement during processing.

[0033] Compared to EROWA or zero-point quick-change systems, the double-layer fixed base structure in this application has lower manufacturing and maintenance costs, significantly reducing tooling costs per small batch product and enhancing market competitiveness for small-batch production. Secondly, it effectively avoids interference risks during five-axis machining. Instead of using a large-size disc, this application employs a compact double-layer fixed base design, reducing the tooling's footprint within the five-axis machining space and lowering the probability of collisions between the tooling and components such as the cutting tool and spindle, ensuring the safety and continuity of the machining process. Finally, regarding precision assurance, the pre-positioning of the positioning boss 5 and the fixed connection of the mounting hole 3 reduce the number of clamping operations during shell machining, lowering positioning errors. Simultaneously, the robust connection between the first fixed base 1 and the second fixed base 2 ensures rigid support during machining, meeting the requirements for shell form and position tolerances and dimensional accuracy, thereby guaranteeing the stability and performance of the entire valve system. In practical applications, by replacing the second fixed base 2 with different specifications or adjusting the connecting parts, it can adapt to the machining of complex shells of various sizes and structures, improving the tooling's versatility and applicability.

[0034] When using this application, the first fixed base 1 is first placed on the worktable of the five-axis machine tool. The bottom of the first fixed base 1 has multiple mounting holes 3, which are then fixed to the process base plate using bolts or other first connecting parts 6. Next, the second fixed base 2 is installed on the first fixed base 1. The bottom of the second fixed base 2 is fixedly connected to the top of the first fixed base 1 by bolts or welding, forming a stable integral structure. The top of the second fixed base 2 is designed with a positioning boss 5 that matches the process table of the shell to be processed. The shape and size of the positioning boss 5 are designed according to the specific characteristics of the shell's process table to ensure precise positioning. When installing the shell to be processed, the process table of the shell is first aligned with the positioning boss 5 on the top of the second fixed base 2 to ensure a perfect match. Then, the shell's process table is firmly fixed to the second fixed base 2 using bolts or other second connecting parts 7 through the mounting holes 3 on the second fixed base 2. After installation, the entire fixture and the shell to be processed form a stable whole, allowing for five-axis machining operations. During machining, the fixture's split structure and the positioning boss 5 design effectively reduce interference and improve machining accuracy and efficiency.

[0035] Through the above-described solution, the five-axis machining fixture for small-batch complex shells provided in this application can effectively solve the problems of high cost and large size of traditional quick-change systems in small-batch production. The split design reduces the overall size of the fixture and avoids interference problems during machining. The design of the positioning boss 5 improves the accuracy of shell installation and solves the positioning problem of irregularly shaped process tables. At the same time, the fixture has a simple structure, low manufacturing cost, and is suitable for small-batch production needs. Furthermore, the versatility and flexibility of the fixture are improved, allowing it to adapt to different types of complex shell machining needs, thus improving machining efficiency and accuracy.

[0036] It should be noted that in other embodiments of this application, the first fixing base 1 and the second fixing base 2 can be an integral structure or a separate structure. If it is an integral structure, the integral structure can be used directly.

[0037] The present application will be further described in detail below through other more detailed embodiments. Figure 1 The diagram shown is a schematic representation of the overall structure of a five-axis machining fixture for small-batch complex shell machining. Figure 2 As shown, Figure 1 A schematic diagram of the bottom structure. (See diagram below.) Figure 3 As shown, Figure 1 A structural diagram showing the structure after the connectors and positioning components are installed. (See diagram below.) Figure 4 As shown, Figure 3 A schematic diagram of the bottom structure. (See diagram below.) Figure 5 The diagram shown is a schematic of a housing mounted on a five-axis machining fixture for small-batch production of complex housings according to this application. Figure 6 The diagram shown is a schematic of another type of housing mounted on a five-axis machining fixture for small-batch complex housings in this application.

[0038] In this embodiment, both the first fixed base 1 and the second fixed base 2 are provided with positioning holes 4. The positioning holes 4 on the first fixed base 1 are positioned with the process base plate of the five-axis machine bed through the first positioning element 8. The positioning holes 4 on the second fixed base 2 are positioned with the process table of the shell to be processed through the second connecting element 7. The positioning holes 4 are distributed on the mounting surfaces of the first fixed base 1 and the second fixed base 2, forming a spatially spaced layout with the mounting holes 3. The first positioning element 8 and the second connecting element 7 adopt a cylindrical pin or tapered pin structure, with the pin diameter clearance-fitted with the positioning hole 4. The axial direction of the positioning hole 4 is parallel or perpendicular to the axial direction of the mounting hole 3. This improves the positioning accuracy of the entire tooling, thereby ensuring the machining accuracy of the complex shell five-axis machining. Simultaneously, the setting of the positioning holes 4 and the positioning element simplifies the positioning process and improves the assembly efficiency of the tooling.

[0039] The first fixed base 1 includes a chassis 101 and a columnar clearance portion 102. The clearance portion 102 is fixed to the chassis 101, and its thickness is less than the diameter of the chassis 101. Clearance spaces are formed on both sides of the clearance portion 102 on the chassis 101. The second fixed base 2 is fixed to the top of the clearance portion 102. After the clearance portion 102 and the chassis 101 are combined, two symmetrical recessed areas are formed on both sides of the chassis 101. When the five-axis equipment is machining the housing, the tool or fixture can extend into the clearance space for multi-angle operation, avoiding collision with the main body of the fixed base. The diameter of the chassis 101 is greater than the thickness of the clearance portion 102 to ensure the overall stability of the tooling. The clearance portion 102 serves as an intermediate support structure, supporting the second fixed base 2 and providing sufficient movement clearance for the machining equipment through height control. The second fixed base 2 is installed at the top of the clearance portion 102, placing the housing to be machined in the area above the clearance space, facilitating multi-faceted machining of the housing by the five-axis equipment from both sides of the clearance space. The design of the chassis 101 and the clearance section 102 provides the tooling with good stability, while the clearance section 102 provides sufficient operating space for the cutting tool. The existence of the clearance space reduces the risk of interference during machining and improves machining efficiency. The second fixed seat 2 is fixed to the top of the clearance section 102, further increasing the height of the tooling and providing more space and flexibility for machining complex shells.

[0040] It should be noted that the chassis 101 and the clearance section 102 can be either an integrated structure or a separate structure, which can be selected according to the needs of use and processing.

[0041] The second fixed base 2 is columnar and is arranged perpendicularly to the clearance portion 102. The columnar shape of the second fixed base 2 enhances rigidity through its axially symmetrical structure. Its perpendicular arrangement ensures that the length of the second fixed base 2 forms a right angle with the axis of the clearance portion 102, thus avoiding spatial interference with the moving parts of the five-axis machine. Furthermore, the perpendicular arrangement allows both ends of the second fixed base 2 to extend over the clearance spaces on both sides of the clearance portion 102, providing ample operating space for the machining tool. This vertical arrangement allows the second fixed base 2 to better withstand cutting forces and vibrations during machining, preventing workpiece displacement and deformation during processing.

[0042] As a preferred embodiment, the second fixing base 2 is rectangular in shape, with both ends extending above the clearance space. This increases the contact area between the second fixing base 2 and the process table of the shell to be processed, improving the stability and rigidity of the tooling. Simultaneously, the design of the second fixing base 2 extending above the clearance space allows the mounting holes 3 and positioning holes 4 to be arranged in a more reasonable position, facilitating connection and positioning with the process table of the shell to be processed.

[0043] Based on the above embodiments, as an example, the second fixing base 2 has two sets of mounting holes 3 and positioning holes 4. One set of mounting holes 3 includes two holes, and one set of positioning holes 4 includes one hole. Both sets of mounting holes 3 and positioning holes 4 are located above the clearance space, and the positioning boss 5 is located between the two sets of mounting holes 3 and positioning holes 4 of the second fixing base 2. Specifically, the four mounting holes 3 are located at the four corners of the second fixing base 2, and the two positioning holes 4 are located between the two mounting holes 3 in each set. In addition, the first fixing base 1 has four mounting holes 3 and two positioning holes 4. The first fixing base 1 has two mounting holes 3 on each side of the clearance portion 102, and the two positioning holes 4 on the first fixing base 1 are located below the clearance portion 102.

[0044] Using this application, the tooling and shaftless machine bed process base plate employ pin hole positioning and screw connection to ensure the positioning accuracy of the tooling after locking. The upper end of the tooling also uses pin hole positioning and screw reverse locking connection. Considering the heavy cutting during rough machining, a positioning boss 5 is designed on the tooling to ensure sufficient strength to support the workpiece during rough machining when the five-axis rotary table is tilted at 90°, reducing the impact force on the pin at the upper end of the tooling and increasing the service life of the pin. The process table connecting the workpiece is designed with a fixed size and connects to the upper end of the tooling. Shells with similar structures and dimensions can be directly connected to this tooling, making processing more convenient and practical for small batches of shells with similar structures. Figure 5 and Figure 6 As shown, two similar shells are mounted on the same tooling. The tooling connects to the process table of the shells to be processed, minimizing interference and ensuring that the shells can be processed at multiple angles without interference.

[0045] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A five-axis machining fixture for small-batch complex shells, characterized in that, It includes a first fixing seat (1) and a second fixing seat (2); The second fixing seat (2) is fixedly installed on the first fixing seat (1); Mounting holes (3) are provided on both the first fixed seat (1) and the second fixed seat (2); the mounting holes (3) on the first fixed seat (1) are connected to the process base plate of the five-axis bed through the first connector (6); the mounting holes (3) on the second fixed seat (2) are connected to the process table of the shell to be processed through the second connector (7); The second fixing seat (2) is provided with a positioning boss (5) on the top, which is used to match and position the shell to be processed.

2. The five-axis machining fixture for small-batch complex shells according to claim 1, characterized in that, Positioning holes (4) are also provided on the first fixing seat (1) and the second fixing seat (2); The positioning hole (4) on the first fixed seat (1) is positioned with the process base plate of the five-axis bed through the first positioning member (8); the positioning hole (4) on the second fixed seat (2) is positioned with the process table of the shell to be processed through the second connecting member (7).

3. The five-axis machining fixture for small-batch complex shells according to claim 2, characterized in that, The mounting hole (3) is a threaded hole, and the positioning hole (4) is a pin hole.

4. The five-axis machining fixture for small-batch complex shells according to claim 3, characterized in that, The first fixed base (1) includes a chassis (101) and a columnar clearance portion (102); The clearance part (102) is fixed on the chassis (101). The thickness of the clearance part (102) is less than the diameter of the chassis (101). Clearance space is formed on both sides of the clearance part (102) on the chassis (101). The second fixing seat (2) is fixed to the top of the clearance part (102).

5. The five-axis machining fixture for small-batch complex shells according to claim 4, characterized in that, The chassis (101) and the clearance section (102) are an integral structure.

6. The five-axis machining fixture for small-batch complex shells according to claim 4, characterized in that, The second fixing seat (2) is columnar; The second fixing seat (2) is arranged perpendicularly to the avoidance part (102).

7. The five-axis machining fixture for small-batch complex shells according to claim 6, characterized in that, The second fixing base (2) is rectangular in shape; The second fixing seat (2) extends to both ends above the clearance space.

8. The five-axis machining fixture for small-batch complex shells according to claim 7, characterized in that, The second fixed base (2) has two sets of mounting holes (3) and positioning holes (4), and both sets of mounting holes (3) and positioning holes (4) are located above the clearance space; The positioning boss (5) is located between the two sets of mounting holes (3) and positioning holes (4).

9. The five-axis machining fixture for small-batch complex shells according to claim 8, characterized in that, The second fixing base (2) has two mounting holes (3) and one positioning hole (4); The four mounting holes (3) are located at the four corners of the second fixing base (2), and the two positioning holes (4) are located between the two mounting holes (3) of a set.

10. The five-axis machining fixture for small-batch complex shells according to claim 9, characterized in that, The first fixing base (1) has four mounting holes (3) and two positioning holes (4); The first fixing base (1) has two mounting holes (3) on both sides of the clearance part (102), and the two positioning holes (4) on the first fixing base (1) are located below the clearance part (102).

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