Profile frame type chassis sample flexible trial welding tool design method and tool

Abstract

The application discloses a profile frame type chassis sample flexible trial-manufacture welding tool design method, and belongs to the field of automobile chassis trial-manufacture welding tool design, and solves the problems of long tool design and manufacturing period, high cost and poor flexibility. The method is based on a matrix multi-hole platform, combined with chassis product data, positions the profile outer contour through a cylindrical positioning block, positions key installation holes through a transition plate and a positioning pin, and positions combined installation holes through a positioning sample and a positioning pin. The matrix multi-hole platform can be repeatedly used, and only needs to be designed with an adaptive positioning structure for different chassis, and the positioning structure is processed through a general lathe and a laser cutting process using conventional raw materials. The application guarantees welding positioning precision, greatly reduces tool design and manufacturing cost, shortens the design and manufacturing period, improves tool flexibility, and meets the requirements of few chassis sample trial-manufacture quantities, more design changes, and short periods.

Description

Technical Field

[0001] This invention relates to the field of chassis prototype welding fixture design, and more specifically, to a design method and fixture for a flexible prototype welding fixture for a profile frame chassis sample. Background Technology

[0002] With the development of automotive lightweighting technology, many concept car models adopt frame structure designs using aluminum profiles and other materials to effectively reduce the overall weight of the chassis. The prototype production stage of concept cars has distinct characteristics: small production quantities, frequent design changes during the production process, and a short overall project cycle. This places high demands on the tooling for prototype production, requiring high flexibility, short cycles, and low costs.

[0003] In existing technologies, welding fixtures for concept vehicle projects mostly adopt formal fixture structures. Although such formal fixtures can meet the high positioning and welding accuracy requirements, they have problems such as long design and manufacturing cycles and high manufacturing costs. Moreover, the fixtures have poor versatility. For chassis prototypes with different design schemes, a complete set of fixtures needs to be redesigned and manufactured. This cannot meet the core needs of concept vehicle prototype prototyping, which involves more design changes and shorter project cycles. This seriously restricts the prototyping efficiency of concept vehicle chassis prototypes and also significantly increases the prototyping cost.

[0004] Therefore, there is an urgent need to develop a welding fixture design method that is adapted to the characteristics of profile frame chassis prototype prototyping. Under the premise of ensuring the positioning accuracy of the welding fixture and meeting the welding requirements of the prototype, the design and manufacturing cost of the fixture should be reduced and the design and manufacturing cycle should be shortened. At the same time, the flexibility of the fixture should be improved to adapt to the prototyping needs of profile frame chassis prototypes with different structures. Summary of the Invention

[0005] The purpose of this invention is to provide a design method for flexible trial welding fixtures for profile frame chassis prototypes, which can solve at least one of the technical problems of long design and manufacturing cycle, high cost, and poor flexibility of welding fixtures for profile frame chassis prototypes in the prior art.

[0006] The technical solution of this invention is implemented as follows: A design method for flexible trial welding fixtures for profile frame chassis prototypes is disclosed. This method utilizes a matrix multi-hole platform combined with chassis product data to achieve the positioning of the profile's outer contour, key mounting holes, and combined mounting holes through different positioning structures, thus completing the design of the welding fixture. The positioning structures include combinations of cylindrical positioning blocks, transition plates and positioning pins, and positioning templates and positioning pins, respectively achieving precise positioning of the profile's outer contour, key mounting holes, and combined mounting holes.

[0007] Furthermore, the specific steps for positioning the profile outer contour using the cylindrical positioning block are as follows: the chassis design data is placed at a suitable position on the matrix multi-hole platform according to preset rules; a positioning hole on the matrix multi-hole platform is selected near the position to be positioned of the profile; the vertical distance from the center of the positioning hole to the positioning surface of the profile is used as the radius of the cylindrical positioning block; the size design of the cylindrical positioning block is completed; and the designed and processed cylindrical positioning block is installed at the selected positioning hole on the matrix multi-hole platform to achieve the positioning of the profile outer contour.

[0008] Furthermore, the specific steps for positioning the key mounting holes using the combination of the transition plate and the positioning pin are as follows: The chassis design data is placed at a suitable position on the matrix multi-hole platform according to preset rules. Four positioning holes on the matrix multi-hole platform are selected near the position to be positioned of the key mounting holes, serving as the fixed mounting holes for the transition plate on the matrix multi-hole platform. The positions of the key mounting holes in the chassis product data are projected onto the design plane of the transition plate. This projected position is used as the installation position of the positioning pin on the transition plate. The positioning pin and the transition plate are designed with an interference fit. The dimensions of the transition plate and the positioning pin are designed. The processed transition plate is fixed at the selected positioning hole on the matrix multi-hole platform. The positioning pin is installed at the preset position on the transition plate, achieving precise positioning of the key mounting holes.

[0009] Furthermore, the specific steps for positioning the assembly mounting hole using the combination of the positioning template and the positioning pin are as follows: First, the outer contour of the profile is accurately positioned using a cylindrical positioning block. Then, the relevant round holes processed on the profile are used as positioning references. Based on the position parameters of the assembly mounting hole in the chassis product data, the size of the positioning template and the position of the positioning hole are designed. The processed positioning template is installed by engaging the positioning reference round hole on the profile with the positioning pin. Then, the installation position of the part to be assembled is determined by engaging the positioning hole on the positioning template with the positioning pin, thereby achieving the positioning of the assembly mounting hole.

[0010] Furthermore, the preset rule for placing the chassis design data onto the matrix multi-hole platform is: symmetrical profile parts are placed in the center, and during the placement process, the positioning holes on the matrix multi-hole platform are avoided from being excessively blocked by the parts, ensuring the installation space of the subsequent positioning structure and the convenience of positioning operations.

[0011] Furthermore, when selecting the mounting holes for the cylindrical positioning blocks, considering the structural characteristics of the profile and the distribution of the positioning holes on the matrix multi-hole platform, priority is given to selecting positioning holes with larger spacing to set the cylindrical positioning blocks, thereby improving the positioning accuracy of the profile's outer contour.

[0012] Furthermore, the transition plate adopts a rectangular structure design to avoid directional errors during installation and improve the convenience of tooling assembly; the transition plate is made of 10mm thick carbon steel plate and is processed by laser cutting technology to ensure the structural strength and dimensional accuracy of the transition plate.

[0013] Furthermore, the positioning template is made of 2mm thick carbon steel plate and processed by laser cutting technology, which reduces the processing cost and weight of the template while ensuring positioning accuracy and facilitating operation.

[0014] Furthermore, both the cylindrical positioning block and the positioning pin are made of ordinary carbon steel bars as raw materials and are manufactured by ordinary lathe processing technology. The raw materials are readily available and the processing technology is simple, which effectively reduces processing costs and processing cycle.

[0015] Furthermore, for profile frame chassis prototypes with different structural designs, only the corresponding cylindrical positioning blocks, transition plates, positioning pins, and positioning templates need to be designed and manufactured according to the chassis product data. The matrix multi-hole platform can be reused without redesigning and manufacturing the entire set of welding tooling, which greatly improves the flexibility of the tooling.

[0016] A flexible prototype welding fixture designed by the method comprises: Standardized matrix porous platform; At least two cylindrical positioning blocks, the radius and height of which are customized according to the profile outline, and the material is Q235 carbon steel; At least one rectangular transition plate, 10mm thick, made of Q235 carbon steel, with mounting holes matching the matrix multi-hole platform and several H7 / p6 interference fit locating pins. At least one positioning template, 2mm thick, made of Q235 carbon steel, has positioning pin holes that match the process holes of the profile and a hollow area that matches the contour of the part to be positioned. The cylindrical positioning block, transition plate, positioning template and matrix multi-hole platform are not permanently connected, and are all detachably assembled by bolts or pins.

[0017] Compared with the prior art, the beneficial effects of the present invention are: 1. This solution utilizes a matrix multi-hole platform as the basic tooling platform, and combines three different positioning structures to achieve precise positioning of the profile outer contour, key mounting holes, and combined mounting holes. The positioning method is adapted to the positioning accuracy requirements of different parts of the chassis sample. The overall tooling design is simple and can effectively ensure the welding positioning accuracy of the profile frame chassis sample, meeting the welding requirements of the sample trial production.

[0018] 2. The matrix multi-hole platform in this solution is reusable. For chassis samples with different structures, only suitable cylindrical positioning blocks, transition plates, positioning pins and positioning templates need to be designed and processed. There is no need to remanufacture the entire set of tooling, which greatly improves the flexibility of welding tooling and effectively solves the problem of poor versatility of existing tooling. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of the present invention, 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 the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of the flexible trial welding fixture of the present invention applied to profiles; Figure 2 for Figure 1 A schematic diagram showing the concealed profile.

[0021] In the picture: 1-Matrix multi-hole platform; 2-Profile; 3-Cylindrical positioning block; 4-Transition plate; 5-Positioning pin; 6-Positioning template; 7-Positioning hole. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., 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 this invention is in use. They are only for the convenience of describing this 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 this invention. In addition, the terms "first," "second," "third," etc., are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, terms such as "horizontal," "vertical," and "sag" do not imply that components must be absolutely horizontal or suspended, but rather that they can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of this invention, 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 invention based on the specific circumstances.

[0028] The following detailed description of some embodiments of the present invention is provided in conjunction with the accompanying drawings. Unless otherwise specified, the following embodiments and features can be combined with each other.

[0029] Example 1 Reference Figure 1 and Figure 2 This embodiment provides a design method for flexible trial welding fixtures for aluminum profile 2 frame chassis prototypes. This method is applicable to the design of trial welding fixtures for aluminum profile 2 frame concept car chassis prototypes. The method uses a matrix multi-hole platform 1 with good flatness and high hole position accuracy as the basic fixture platform. Combined with the three-dimensional design data of the chassis product, three differentiated positioning structures are used to achieve precise positioning of the outer contour of profile 2, key mounting holes, and combined mounting holes, thus completing the overall design of the welding fixture. The positioning structures include a combination of cylindrical positioning blocks 3, transition plates 4 and positioning pins 5, and positioning templates 6 and positioning pins 5. The design and installation of each positioning structure are adapted to the hole distribution of the matrix multi-hole platform 1, and can be flexibly adapted to chassis prototypes with different structures. The specific implementation steps are as follows: Step 1: Layout planning of the matrix multi-hole platform for chassis product data Obtain the 3D design data of the frame chassis sample of profile 2 to be tested, and place the 3D design data into the virtual design space of the matrix multi-hole platform 1 according to the preset rules. The preset rules are: for the symmetrical structural profile 2 in the chassis, the profile 2 is placed in the center. During the placement process, the position of profile 2 is planned reasonably to avoid the positioning holes 7 on the matrix multi-hole platform 1 being blocked too much by profile 2, so as to ensure the installation space of each positioning structure and the convenience of positioning operation, while ensuring that the overall structure of the fixture is simple and highly versatile.

[0030] Step 2: Design and install cylindrical positioning block 3 to achieve positioning of the outer contour of profile 2. According to the placement of the profile 2 planned in step 1, for each section of the profile 2 that needs to be positioned, a positioning hole 7 of a matrix multi-hole platform 1 is selected near the positioning position of the profile 2 as the mounting hole of the cylindrical positioning block 3; the vertical distance from the center of the mounting hole to the positioning surface of the profile 2 is measured, and this distance is used as the design radius of the cylindrical positioning block 3. The height of the cylindrical positioning block 3 is designed to be adapted to the thickness of the profile 2 to ensure that it can effectively limit the outer contour of the profile 2.

[0031] The cylindrical positioning block 3 is made of ordinary carbon steel bar material and is manufactured according to the design dimensions by ordinary lathe processing technology. After processing, the cylindrical positioning block 3 is firmly installed at the selected positioning hole 7 of the matrix multi-hole platform 1 to complete the positioning of the outer contour of the profile 2.

[0032] When selecting the mounting holes for the cylindrical positioning blocks 3, considering the structural characteristics of the profile 2 and the distribution of the positioning holes 7 on the matrix multi-hole platform 1, priority is given to selecting the positioning holes 7 on the matrix multi-hole platform 1 with larger spacing to correspond to the cylindrical positioning blocks 3. For example, mounting holes are selected at both ends of the profile 2. The principle of two-point positioning is used to improve the overall positioning accuracy of the outer contour of the profile 2. The specific installation position layout is as follows: Figure 1 As shown.

[0033] Step 3: Design and install the transition plate 4 and locating pin 5 to achieve the positioning of key mounting holes. For the critical mounting holes in the chassis prototype that require high positional accuracy and are key to the spatial structure, a combination of transition plate 4 and locating pin 5 is used to achieve positioning, specifically: 1. Based on the product data placement position in step 1, select four positioning holes 7 of the matrix multi-hole platform 1 near the key mounting hole positions. The four positioning holes 7 are distributed in a rectangular shape and serve as the fixing mounting holes for the transition plate 4 on the matrix multi-hole platform 1 to ensure the stability of the transition plate 4 after installation. 2. Project the key mounting hole positions in the chassis product data onto the design plane of the transition plate 4. Use this projection position as the installation position of the positioning pin 5 on the transition plate 4. The outer diameter of the positioning pin 5 is adapted to the inner diameter of the key mounting hole. The positioning pin 5 and the transition plate 4 adopt an interference fit design to prevent the positioning pin 5 from shifting during the welding process and to ensure positioning accuracy. 3. The transition plate 4 is made of carbon steel plate with a thickness of 8-12mm (e.g., 10mm) and is designed as a rectangular structure to avoid directional errors during installation. It is manufactured according to the design dimensions by laser cutting process, and the fixing holes and positioning pin 5 mounting holes of the transition plate 4 are machined out. The positioning pin 5 is made of ordinary carbon steel bar material and is manufactured by ordinary lathe processing process. 4. Fix the processed transition plate 4 to the four selected positioning holes 7 of the matrix multi-hole platform 1 using bolts, nuts, and other fasteners. Press the positioning pins 5 into the preset mounting holes of the transition plate 4 to complete the precise positioning of the key mounting holes. The specific structure is as follows: Figure 1 As shown.

[0034] Step 4: Design and install positioning template 6 and positioning pin 5 to achieve positioning of the combined mounting holes. For the assembly holes in the chassis sample that have low positional accuracy requirements and relatively simple structure, a combination of positioning template 6 and positioning pin 5 is used to achieve positioning, specifically: 1. First, the cylindrical positioning block 3 in step 2 is used to accurately position the outer contour of the profile 2. Then, the relevant round hole that has been processed on the profile 2 is selected as the positioning reference. The processing accuracy of the reference round hole meets the positioning requirements. 2. Based on the position parameters of the combined installation holes in the chassis product data, and combined with the position of the positioning reference round hole on the profile 2, design the outer dimensions of the positioning template 6 and the position of the positioning hole 7. The positioning hole 7 on the positioning template 6 includes the installation hole that mates with the reference round hole of the profile 2 and the positioning hole 7 that corresponds to the combined installation hole. 3. Positioning template 6 is made of carbon steel plate with a thickness of 1-3mm (e.g., 2mm) as raw material and is processed according to the design dimensions by laser cutting process. While ensuring positioning accuracy, it reduces the processing cost and weight of the template and facilitates on-site assembly operation. 4. Install the processed positioning template 6 by engaging the positioning pin 5 with the positioning reference hole on the profile 2, so that the positioning template 6 is firmly attached to the surface of the profile 2. Then, by engaging the positioning pin 5 with the positioning hole on the positioning template 6 corresponding to the positioning hole 7, the installation position of the part to be assembled is determined, and the positioning of the assembly hole position is achieved. The specific structure is as follows: Figure 1 As shown.

[0035] Step 5: Overall assembly and debugging of welding fixtures After completing the design and installation of the above positioning structures, the entire welding fixture is assembled and debugged. Check whether the installation positions of each cylindrical positioning block 3, transition plate 4, positioning pin 5, and positioning template 6 are consistent with the chassis product data, and whether the positioning accuracy meets the welding requirements of the sample. If there is a positioning deviation, adjust the installation position of the positioning structure or correct the design dimensions of the positioning structure in time until the positioning accuracy of the fixture meets the trial welding requirements of the profile 2 frame chassis sample, and complete the overall design of the welding fixture.

[0036] When it is necessary to design welding fixtures for profile 2 frame chassis samples with other structural designs, there is no need to replace the matrix multi-hole platform 1. Simply repeat steps 1 to 5 above based on the new chassis product data to design and process the appropriate cylindrical positioning block 3, transition plate 4, positioning pin 5 and positioning template 6. The matrix multi-hole platform 1 can be reused, which greatly improves the flexibility of the fixture.

[0037] In this embodiment, the welding fixture design method uses conventional raw materials and conventional processing technology for all positioning structures. This results in low raw material costs, short processing cycles, and a simplified design process, eliminating the need for complex fixture structure designs. Compared to existing welding fixtures with conventional fixture structures, this method reduces design and manufacturing costs and shortens the design and manufacturing cycle. Furthermore, the matrix multi-hole platform 1 has good flatness and high hole position accuracy. Combined with the precise design of each positioning structure, the overall positioning accuracy of the fixture can meet the trial welding requirements of the profile 2 frame chassis prototype. This effectively solves the problems of long cycle, high cost, and poor flexibility in the trial welding fixtures for concept car chassis prototypes in the prior art.

[0038] Example 2 A flexible trial welding fixture designed by the method described in Example 1 includes: Standardized matrix porous platform 1; At least two cylindrical positioning blocks 3, whose radius and height are customized according to the profile of the profile 2, and are made of Q235 carbon steel; At least one rectangular transition plate 4, 10mm thick, made of Q235 carbon steel, is provided with mounting holes matching the matrix multi-hole platform 1 and several H7 / p6 interference fit locating pins 5. At least one positioning template 6, 2mm thick, made of Q235 carbon steel, has positioning pin 5 holes that match the process holes of profile 2 and a hollow area that matches the contour of the part to be positioned. The cylindrical positioning block 3, transition plate 4, positioning template 6 and matrix multi-hole platform 1 are not permanently connected, and are all detachably assembled by bolts or pins.

[0039] The beneficial effects of the technical solution of the present invention are: 1. This invention utilizes a matrix multi-hole platform 1 as a basic tooling platform, and combines three differentiated positioning structures to achieve precise positioning of the outer contour of profile 2, key mounting holes and combined mounting holes respectively. The positioning method is adapted to the positioning accuracy requirements of different parts of the chassis sample. The overall tooling design is simple and can effectively ensure the welding positioning accuracy of the frame chassis sample of profile 2, and meet the welding requirements of sample trial production.

[0040] 2. The matrix multi-hole platform 1 in this invention is reusable. For chassis samples with different structures, only the appropriate cylindrical positioning block 3, transition plate 4, positioning pin 5 and positioning template 6 need to be designed and processed. There is no need to remanufacture the entire set of tooling, which greatly improves the flexibility of welding tooling and effectively solves the problem of poor versatility of existing tooling.

[0041] 3. The positioning structures of this invention are all made of ordinary carbon steel bars and carbon steel plates as raw materials, and are manufactured by conventional processes such as conventional turning and laser cutting. The raw material cost is low, the processing technology is simple and easy to implement, which greatly reduces the design and manufacturing cost of welding fixtures. At the same time, the design and processing flow of the positioning structure is simplified, and there is no need for complex fixture structure design, which effectively shortens the design and manufacturing cycle of the fixtures and adapts to the needs of short trial production cycle and more design changes of concept car prototypes.

[0042] 4. This invention has made targeted optimizations to the installation and design of the positioning structure. For example, the transition plate 4 adopts a rectangular structure to avoid installation errors, the cylindrical positioning block 3 is preferentially selected to install the positioning holes 7 with a larger spacing to improve positioning accuracy, and the placement of parts avoids obstructing the positioning holes 7 of the matrix multi-hole platform 1. This improves the convenience of tooling assembly and the accuracy of positioning, and reduces the difficulty of operation.

[0043] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A design method for flexible trial welding fixtures for profile frame chassis prototypes, characterized in that, By utilizing a matrix multi-hole platform combined with chassis product data, different positioning structures are used to locate the profile outer contour, key mounting holes, and combined mounting holes, thereby completing the design of welding fixtures. The positioning structure includes at least one of the following: a cylindrical positioning block, a combination of a transition plate and a positioning pin, and a combination of a positioning template and a positioning pin.

2. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 1, characterized in that, The specific steps for positioning the outer contour of the profile using the cylindrical positioning block are as follows: place the chassis design data at a suitable position on the matrix multi-hole platform, select a positioning hole on the matrix multi-hole platform near the profile, and use the distance from the center of the positioning hole to the positioning surface of the profile as the radius of the cylindrical positioning block to complete the size design and installation positioning of the cylindrical positioning block.

3. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 1, characterized in that, The specific steps for positioning the key mounting holes using the combination of the transition plate and the positioning pin are as follows: place the chassis design data at a suitable position on the matrix multi-hole platform, select four positioning holes on the matrix multi-hole platform near the key mounting holes as mounting holes for the transition plate, use the projection of the key mounting holes on the transition plate as the installation position of the positioning pin, and use an interference fit between the positioning pin and the transition plate to complete the size design and installation positioning of the transition plate and the positioning pin.

4. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 1, characterized in that, The specific steps for positioning the assembly mounting hole using the combination of the positioning template and the positioning pin are as follows: After positioning the profile using the cylindrical positioning block, the relevant round holes on the profile are used as positioning references. The dimensions of the positioning template are designed based on the chassis product data. The position of the part to be assembled is determined by the positioning template and the positioning pin, thereby achieving the positioning of the assembly mounting hole.

5. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to any one of claims 1 to 4, characterized in that, When placing chassis product data on a matrix multi-hole platform, symmetrical parts should be placed in the center, and the positioning holes on the matrix multi-hole platform should be avoided from being excessively obstructed by the parts.

6. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 2, characterized in that, When selecting the positioning position of the cylindrical positioning block, the positioning hole positions of the profile structure and the matrix multi-hole platform should be considered, and the cylindrical positioning block should be set to the positioning holes with larger spacing.

7. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 3, characterized in that, The transition plate is designed as a rectangular structure and is made of 8-12mm thick carbon steel plate by laser cutting.

8. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 4, characterized in that, The positioning template is made of 1-3mm thick carbon steel plate by laser cutting.

9. The design method for flexible trial welding fixtures for profile frame chassis prototypes according to claim 1, characterized in that, The cylindrical positioning block and positioning pin are manufactured from carbon steel bars using conventional machining processes.

10. A flexible trial welding fixture designed by the method according to any one of claims 1 to 9, characterized in that, include: Standardized matrix porous platform; At least two cylindrical positioning blocks, the radius and height of which are customized according to the profile outline; At least one rectangular transition plate is provided with mounting holes that match the matrix multi-hole platform and several interference fit locating pins. At least one positioning template is provided, which has positioning pin holes that match the process holes of the profile and a hollow area that matches the contour of the part to be positioned. The cylindrical positioning block, transition plate, positioning template and matrix multi-hole platform are not permanently connected, and are all detachably assembled by bolts or pins.

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