A welding fixture for mixed-model workpiece processing and a mixed-model processing method

Abstract

This application relates to the field of welding fixture technology for automotive parts, and in particular to a welding fixture and method for mixed-model workpiece machining. It includes a fixture platform, a universal support and positioning mechanism, a positioning and clamping mechanism, a model identification unit, a model recognition unit, and a central control unit, all mounted on the fixture platform. The model identification unit has multiple types, each corresponding to a specific C-pillar model. The model recognition unit detects the type of the model identification unit and determines the corresponding C-pillar model. The central control unit controls the corresponding positioning and clamping mechanism to clamp the C-pillar model. Through the cooperation of the model identification unit, model recognition unit, and central control unit, this application automatically identifies the C-pillar model to be processed and switches to the corresponding fixture, eliminating the need for manual disassembly and reinstallation of the fixture, making the process more convenient and efficient.

Description

Technical Field

[0001] This application relates to the field of welding tooling technology for automotive parts, and in particular to a welding fixture and method for mixed-line machining of multiple workpiece models. Background Technology

[0002] In the current automotive manufacturing industry, body welding fixtures are typically used to complete the welding of the body-in-white. Existing body welding fixtures mainly consist of three main functional mechanisms: positioning, support, and clamping. They are also typically unique and stable, meaning that each type of car model requires a customized body welding fixture.

[0003] With the development of the automotive industry, more and more automotive parts are being shared across multiple models, and mixed-model production lines are becoming increasingly common. For the same type of car (especially cars of the same brand), different body parts (such as the C-pillar) usually share some structural shapes, but their overall structural shapes are slightly different. However, due to the uniqueness of traditional fixtures, in mixed-model production lines, each type of automotive part needs to have a custom-made fixture tailored to its overall structure, leading to a gradual increase in the storage space required by the fixtures. On the other hand, modifying or adding production lines for different types of automotive parts is not feasible due to limited processing area space and high costs. Therefore, how to better adapt to mixed-model production lines has become an urgent problem to be solved in the current field.

[0004] like Figure 1 As shown, there is a C-pillar for a car body. In actual manufacturing, there are three different models of this C-pillar. Each model consists of three modules: module a, module b, and module c, and each module has several process holes. The differences between the three models lie in the structural shapes of some components of the three modules and the location of some process holes. In existing mixed-model manufacturing lines, the three modules are typically processed at the front-end assembly line. Then, manual judgment is used to determine which model of C-pillar each module corresponds to. Afterward, the corresponding... The fixture is installed on the welding fixture. Then, the workers place the three modules on the support mechanism of the welding fixture, and use the positioning mechanism and several process holes to position them. Finally, the clamping mechanism fixes them, thus ensuring that the subsequent welding process at the connection of the three modules is correct and that the final welding quality of the product is qualified. However, when it is necessary to replace the C-pillar of another model, the entire welding fixture must be replaced with a fixture that is compatible with the new model's C-pillar. Otherwise, there will be problems with some positioning and clamping mechanisms not being able to hold the new model's C-pillar, affecting the subsequent welding process and making it inconvenient to use. Summary of the Invention

[0005] To address the inconvenience of existing mixed-model workpiece machining processes, which require manual identification of the C-pillar model to be processed and a different matching fixture for each C-pillar model, this application provides a welding fixture and a mixed-model machining method for mixed-model workpiece machining.

[0006] Firstly, this application provides a welding fixture for mixed-model workpiece machining, which adopts the following technical solution: A welding fixture for mixed-model workpiece machining includes a tooling platform, a universal support and positioning mechanism mounted on the tooling platform for supporting and positioning common structural components on C-pillars of various car bodies, a positioning and clamping mechanism mounted on the tooling platform for positioning and clamping the C-pillars of the car body, a model identification unit pre-installed on the C-pillars of the car body, a model recognition unit mounted on the tooling platform, and a central control unit. The positioning and clamping mechanism has multiple models, the number of which is the same as the number of models of the C-pillars of the car body and the structure is compatible. The model identification unit has multiple types and corresponds one-to-one with the C-pillar models of the car body. The model recognition unit is used to detect the type of the model identification unit and determine the corresponding C-pillar model. The central control unit controls the positioning and clamping mechanism of the corresponding model to clamp the C-pillar of the car body according to the C-pillar model.

[0007] By adopting the above technical solution, when a worker places a C-pillar pre-installed with a model identification unit on the universal support positioning mechanism, the model identification unit automatically identifies the C-pillar model corresponding to the model identification unit and transmits the detection information to the central control unit in the form of an electrical signal. The central control unit receives and processes the electrical signal, thereby controlling the corresponding model positioning and clamping mechanism to start according to the C-pillar model being processed, thus achieving the clamping and fixing of the C-pillar of that model. When processing other models of C-pillars, it is only necessary to ensure that the corresponding C-pillar has a pre-installed model identification unit, eliminating the need for workers to repeatedly disassemble and replace the overall fixture, making the process simple and convenient.

[0008] Preferably, the positioning and clamping mechanism includes a specific support and positioning structure disposed on the tooling platform for supporting and positioning different structural components on the C-pillar of multiple models of the vehicle body, a first drive component for driving the specific support and positioning structure to move closer to or away from the C-pillar of the vehicle body, and a specific clamping structure for pressing the C-pillar of the vehicle body onto the specific support and positioning structure. The first drive component and the specific clamping structure are both electrically connected to the main control unit.

[0009] By adopting the above technical solution, when supporting the C-pillar of different models of the vehicle body, the first drive component drives the specific support positioning structure of the corresponding model to approach the C-pillar of the vehicle body. Through the cooperation of the specific clamping structure and the specific support positioning structure, the different structures on the C-pillar of multiple models of the vehicle body are clamped. The remaining unused specific support positioning structures are set away from the C-pillar of the vehicle body to avoid interfering with the placement of the C-pillar of the vehicle body.

[0010] Preferably, the model identification unit includes an identification block disposed on the C-pillar of the vehicle body and an inner support member for fixing the identification block to the C-pillar of the vehicle body. The identification block has an identification hole at a position corresponding to the process hole one of the C-pillar of the vehicle body. The size of the identification hole is smaller than the size of the process hole one. The identification hole size of various types of model identification units is different. The model identification unit determines the corresponding C-pillar model of the vehicle body by identifying the size of the identification hole.

[0011] By adopting the above technical solution, the inner support component and the identification block are pre-installed on the C-pillar of the vehicle body in the production line to form a reserved process structure. Through this structural feature and the setting of the identification hole, a stable and identifiable feature is formed. Compared with common barcodes, QR codes and other identification methods, which are prone to unclear identification, this identification feature is more stable and less susceptible to interference.

[0012] Preferably, the model identification unit includes a first sliding seat slidably disposed on the tooling platform, a first sensor disposed on the first sliding seat, a detection pin slidably disposed on the first sliding seat, an elastic reset member disposed on the first sliding seat for driving the detection pin to reset, and a second drive assembly for driving the first sliding seat to slide closer to or away from the C-pillar of the vehicle body. The first sensor is used to monitor the position of the end face of one end of the detection pin, and the other end of the detection pin is provided with a detection plug that mates with the marking hole.

[0013] By adopting the above technical solution, when the C-pillar of the vehicle body with the pre-installed marking block is placed stably, the first sliding seat can be driven to slide close to the C-pillar of the vehicle body by the second drive component. During this process, the size of the marking hole is different, the depth of the detection plug inserted into the marking hole is also different, that is, the final position of the detection pin is also different. Thus, the model of the C-pillar of the vehicle body can be determined by the position of the end face of the detection pin monitored by the first sensor.

[0014] Preferably, the detection plug is tapered, with the larger end of the detection plug connected to the detection pin, and the minimum circular cross-sectional dimension of the detection plug is smaller than the size of the marking hole, while the maximum circular cross-sectional dimension of the detection plug is larger than the size of the process hole.

[0015] By adopting the above technical solution, the detection process is made more accurate by using a tapered detection plug in conjunction with the marking hole, while also increasing the range of C-pillar models corresponding to the marking block.

[0016] Preferably, the tooling platform is provided with a universal clamping mechanism, which is provided in correspondence with the universal support and positioning mechanism, and the universal clamping mechanism is used to press the C-pillar of the vehicle body onto the universal support and positioning mechanism.

[0017] By adopting the above technical solution, the stability of the C-pillar placement of the vehicle body is further improved during use through a universal clamping mechanism in conjunction with a universal support and positioning mechanism.

[0018] Preferably, a lateral clamping and positioning structure is provided on the tooling platform at the position corresponding to the model identification unit. The lateral clamping and positioning structure is used to ensure that the model identification unit and the model identification unit are aligned at their installation positions.

[0019] By adopting the above technical solution, the lateral clamping and positioning structure ensures that the structural part of the corresponding model identification unit on the C-pillar of the vehicle body is placed in the correct position during use, thereby ensuring that the subsequent model identification unit can correctly identify the model identification unit.

[0020] Preferably, the universal support and positioning mechanism includes a first fixed frame fixed on the tooling platform, a first support block disposed on the first fixed frame, and a first positioning pin disposed on the tooling platform. One end of the first support block abuts against the surface of the C-pillar of the vehicle body; the first positioning pin is inserted into a process hole on the C-pillar of the vehicle body.

[0021] By adopting the above technical solution, the first support block ensures the stability of the C-pillar of the vehicle body during use. The first positioning pin is engaged with the process hole on the C-pillar of the vehicle body to locate the C-pillar, thereby ensuring the accuracy of subsequent welding.

[0022] Preferably, the tooling platform is equipped with a position detection unit for detecting whether the component modules of the C-pillar of the vehicle body are placed in the correct position.

[0023] By adopting the above technical solution, during use, the position detection unit can automatically identify whether the C-pillar component is placed on the universal support positioning mechanism, which is more conducive to automated processing.

[0024] Secondly, this application provides a method for machining multiple workpiece models using mixed-line machining, which adopts the following technical solution: A method for machining multiple workpiece models using a mixed-line machining process includes the following steps: S1. Install a marker block on the C-pillar of the vehicle body; S2. The C-pillar of the vehicle body is initially positioned by the universal support positioning mechanism, and the position detection unit automatically identifies whether the C-pillar of the vehicle body is correctly positioned. If it is correct, the universal clamping mechanism is controlled to clamp the C-pillar of the vehicle body. S3. The area with the marker block on the C-pillar of the vehicle body is clamped and positioned by the lateral clamping and positioning structure. S4. After the model identification unit identifies the C-pillar model corresponding to the identification block, the main control unit controls the corresponding model's positioning and clamping mechanism to start, completing the secondary clamping and positioning of the C-pillar. S5. Perform welding operations.

[0025] In summary, this application includes at least one of the following beneficial technical effects: The model identification unit automatically identifies the C-pillar model corresponding to the model identification unit and transmits the detection information to the main control unit in the form of an electrical signal. The main control unit receives and processes the electrical signal, and controls the corresponding positioning and clamping mechanism to start according to the C-pillar model being processed. This enables the clamping and fixing of the C-pillar of that model. When processing other models of C-pillars, it is only necessary to pre-install the corresponding model identification unit on the C-pillar. There is no need for workers to repeatedly disassemble and replace the entire fixture. The process is simple and convenient. By setting up a specific support and positioning structure and a first drive component, the clamping stability of the C-pillar of the vehicle body is increased, while also avoiding interference from the placement of the C-pillar of the vehicle body caused by the unused specific support and positioning structure. By using the detection plug, marking block, detection pin and first sensor in combination, the model of the C-pillar of the car body is identified by utilizing structural features. The identification process is more stable and accurate, which is more conducive to the application of mixed-line processing. Attached Figure Description

[0026] Figure 1 This is an exploded view of the three main structural modules of the C-pillar of the vehicle body, as shown in the background of this application. Figure 2 This is a schematic diagram of the structure in Embodiment 1 of this application, mainly showing the C-pillar of the vehicle body placed on the welding fixture; Figure 3 This is an isometric schematic diagram of the overall structure of the welding fixture, which is the main feature of Embodiment 1 of this application. Figure 4 This is an isometric schematic diagram of the main positions of multiple sets of general support and positioning mechanisms in Embodiment 1 of this application; Figure 5 This is a schematic diagram of the structure of the two sets of universal support and positioning mechanisms corresponding to the C-pillar a module of the vehicle body, which is the main feature of Embodiment 1 of this application. Figure 6This is a structural schematic diagram of the three sets of universal support and positioning mechanisms corresponding to the C-pillar b module of the vehicle body, which is the main feature of Embodiment 1 of this application; Figure 7 This is a schematic diagram of the structure of the two sets of universal support and positioning mechanisms corresponding to the C-pillar c module of the vehicle body, which is the main feature of Embodiment 1 of this application. Figure 8 This is an isometric schematic diagram of the main positioning and clamping mechanism installation structure in Embodiment 1 of this application; Figure 9 This is an exploded view of the main model identification unit installation structure in Embodiment 1 of this application; Figure 10 This is an isometric schematic diagram of the main model identification unit mounting structure in Embodiment 1 of this application; Figure 11 a is the identification status diagram of the model identification unit corresponding to the C-pillar of the first model body in Embodiment 1 of this application; Figure 11 b is the identification status diagram of the model identification unit corresponding to the C-pillar of the second model body, which is mainly reflected in Embodiment 1 of this application; Figure 11 c is the identification status diagram of the model identification unit corresponding to the C-pillar of the third model body in Embodiment 1 of this application; Figure 12 This is an isometric schematic diagram of the main structure of the second drive component in Embodiment 1 of this application; Figure 13 This is an isometric schematic diagram of the installation state of the lateral clamping and positioning structure, which is the main feature of Embodiment 1 of this application. Figure 14 This is an isometric schematic diagram of the main structure of the second sensor and the marking ear plate in Embodiment 1 of this application; Figure 15 This is a schematic diagram illustrating the installation position of the position detection unit in Embodiment 1 of this application; Figure 16 This is a schematic diagram illustrating the main cooperative relationship between the detection plug and the identification block in Embodiment 2 of this application.

[0027] Reference numerals: 1. Tooling platform; 11. Driving component; 2. General support and positioning mechanism; 21. First fixed frame; 22. First support block; 23. First positioning pin; 24. Pad; 25. Fixed plate; 3. Positioning and clamping mechanism; 31. Specific support and positioning structure; 311. Second fixed frame; 312. Second support block; 313. Second positioning pin; 32. First driving assembly; 321. First fixed seat; 322. First driving cylinder; 323. Magnetic switch; 324. Piston magnetic ring; 33. Specific clamping structure; 331. Second clamping cylinder; 332. Second pressure block; 34. Extension plate; 35. Buffer block one; 36. Buffer block two; 4. Model identification unit; 41. Identification block; 42. Inner support component; 43. Identification hole; 44. Identification ear plate; 5. Model identification unit; 51. First sliding seat; 52. First sensor; 53. Detection pin 54. Shaft; 55. Elastic reset component; 56. Second drive assembly; 57. Second fixed seat; 58. Second drive cylinder; 59. Detection plug; 50. Third positioning pin; 6. Main control unit; 70. Universal clamping mechanism; 71. First clamping cylinder; 72. First pressure block; 81. Lateral clamping and positioning structure; 82. Front abutment assembly; 83. Third fixed frame; 84. Third clamping cylinder; 85. Third mounting seat; 86. Third drive cylinder; 87. Second sliding seat; 88. Lateral abutment block; 89. Rear abutment assembly; 80. Fourth fixed frame; 81. Fourth drive cylinder; 82. Third sliding seat; 82. Fourth positioning pin; 83. Second sensor; 9. Position detection unit; 10. Guide positioning structure; 20. Wire frame; 31. Body C-pillar; 301. Module a; 302. Module b; 303. Module c. Detailed Implementation

[0028] The following is in conjunction with the appendix Figure 1 -Appendix Figure 16 This application will be described in further detail.

[0029] This application discloses a welding fixture and a method for mixed-line machining of multiple workpiece models.

[0030] Reference Figure 1The structural differences between the three models of the C-pillar 30 in this application are that only the structures of module a 301 and module c 303 are slightly different, while the structures of module b 302 are completely identical in all three models. Specifically, taking the structure of the first model's C-pillar 30 as a reference, the difference between the second model's C-pillar 30 and the first model's C-pillar 30 is that the edge of the middle area in the length direction of module a 301 is different, while the other structures are completely identical. The difference between the third model's C-pillar 30 and the first model's C-pillar 30 is that the length of module c 303 is different, while the other structures are completely identical. Figure 1 Only the three module structures of the first model of the C-pillar 30 are shown in the document; the structures of the other two models are not shown. The following description is based on the C-pillar 30 structure shown in this application. Example 1

[0031] Reference Figure 2 and Figure 3 A welding fixture for mixed-model workpiece machining includes a tooling platform 1, a general support and positioning mechanism 2, a positioning and clamping mechanism 3, a model identification unit 4, a model recognition unit 5, a central control unit 6, a general clamping mechanism 7, a transverse clamping and positioning structure 8, a position detection unit 9, and a guide positioning structure 10; wherein, the tooling platform 1 is placed horizontally, and the general support and positioning mechanism 2, the positioning and clamping mechanism 3, the model identification unit 4, the model recognition unit 5, the central control unit 6, the general clamping mechanism 7, the transverse clamping and positioning structure 8, the position detection unit 9, and the guide positioning structure 10 are all disposed on the tooling platform 1.

[0032] Reference Figure 2 and Figure 4 Specifically, the universal support and positioning mechanism 2 is used to support and position the common structural components on the C-pillar 30 of multiple models of the vehicle body. In this application, since each model of the C-pillar 30 is composed of three modules a, b, and c, each module of the C-pillar 30 of the vehicle body in this application needs to be provided with at least one set of universal support and positioning mechanism 2. The number of universal clamping mechanisms 7 is the same as the number of universal support and positioning mechanisms 2 and their positions correspond one-to-one. The universal clamping mechanism 7 is used to press the C-pillar 30 of the vehicle body onto the universal support and positioning mechanism 2.

[0033] Reference Figure 2 and Figure 4In this embodiment, two sets of universal support and positioning mechanisms 2 are provided for the C-pillar 30a module 301 of the vehicle body, and one set of universal support and positioning mechanisms 2 is located at the splicing gap between the C-pillar 30a module 301 and the b module 302 of the vehicle body, and this set of universal support and positioning mechanisms 2 provides support for both the C-pillar 30a module 301 and the b module 302 of the vehicle body; three sets of universal support and positioning mechanisms 2 are provided for the C-pillar 30b module 302 of the vehicle body, and one set of universal support and positioning mechanisms 2 is located at the splicing gap between the C-pillar 30a module 301 and the b module 302 of the vehicle body. At the splicing gap of module b 302, two other sets of universal support and positioning mechanisms 2 are located at the splicing gap of module b 302 and module c 303 of the C-pillar of the vehicle body; corresponding to module c 303 of the C-pillar of the vehicle body, two sets of universal support and positioning mechanisms 2 are provided, and the two sets of universal support and positioning mechanisms 2 are used to support and position the end of module c 303 of the C-pillar of the vehicle body away from module b 302; that is, in use, the placement stability of the three modules 30a, b and c of the C-pillar of the vehicle body is ensured by setting multiple sets of universal support and positioning mechanisms 2.

[0034] Reference Figure 4 and Figure 5 Each set of universal support and positioning mechanisms 2 consists of a first fixed frame 21, a first support block 22, and a first positioning pin 23. The first fixed frame 21 is fixed to the tooling platform 1 by bolts, and the first support block 22 is fixed to the first fixed frame 21 by bolts. The upper end face of the first support block 22 abuts against the lower surface of the C-pillar 30 of the vehicle body. In order to ensure the support stability of the first support block 22, several layers of stacked pads 24 are provided at the connection between the first support block 22 and the first fixed frame 21. The setting of several layers of pads 24 makes it easy for the staff to fine-tune the setting height of the first support block 22 during the debugging process, thereby ensuring the stable support of the first support block 22 for the C-pillar 30 of the vehicle body. The first positioning pin 23 is set on the tooling platform 1 and is inserted into the process hole on the C-pillar 30 of the vehicle body. In use, the first support block 22 provides support for the C-pillar 30 of the vehicle body, and the first positioning pin 23 positions the C-pillar 30 of the vehicle body to ensure the subsequent processing of the C-pillar 30 of the vehicle body.

[0035] Reference Figure 4 and Figure 5 The differences between the multiple sets of universal support and positioning mechanisms 2 in this application lie in the different positions and quantities of the first support block 22, and the different positions and quantities of the first positioning pin 23. Specifically, for module 301 of the C-pillar 30 of the vehicle body, the two sets of universal support and positioning mechanisms 2 corresponding to it are respectively named Universal Support and Positioning Mechanism 2- (e.g., Figure 5 (As shown on the right), General support and positioning mechanism 2 ( Figure 5As shown on the left), the universal support positioning mechanism 2 is located at the end of module a 301 away from module b 302. There are two first support blocks 22 in the universal support positioning mechanism 2, and the two first support blocks 22 are respectively located at the two ends of one side of module a 301. The first positioning pin 23 in the universal support positioning mechanism 2 is located between the two first support blocks 22, and the first positioning pin 23 is vertically set. The first positioning pin 23 is fixed on the first fixing frame 21 and is inserted into a process hole of module a 301.

[0036] Reference Figure 4 and Figure 5 The universal support positioning mechanism 2 is located at the joint between module a 301 and module b 302. There are two first support blocks 22 in the universal support positioning mechanism 2, one of which abuts against the lower surface of module a 301 and the other abuts against the lower surface of module b 302. The first positioning pin 23 in the universal support positioning mechanism 2 is vertically arranged and located on one side of the first support block 22. The first positioning pin 23 is installed on the tooling platform 1 through the fixing plate 25. The first positioning pin 23 is inserted into a process hole at the end of module a 301 near module b 302.

[0037] Reference Figure 4 and Figure 6 For module 302 of the C-pillar 30 of the vehicle body, the three sets of universal support positioning mechanisms 2 are named universal support positioning mechanism 2-3, universal support positioning mechanism 2-4, and universal support positioning mechanism 2-5 respectively. Universal support positioning mechanism 2-3 is located on the side of module 302 away from universal support positioning mechanism 2-2. The first support block 22 of universal support positioning mechanism 2-3 abuts against the lower surface of the connection end of module 302 near module a 301. Universal support positioning mechanisms 2-4 and 2-5 are located at both ends of the splicing gap between module 302 and module c 303 respectively. Both universal support positioning mechanisms 2-4 and 2-5 have two first support blocks 22, that is, the two first support blocks 22 support module 302 and module c 303 at the same time, thereby ensuring the stability of the splicing gap between module 302 and module c 303, and thus ensuring the subsequent welding quality.

[0038] Reference Figure 4 and Figure 6Meanwhile, on the tooling platform 1, a number of driving components 11 are also provided in the area corresponding to module b 302. The number of driving components 11 is the same as the number of universal support positioning mechanisms 2 corresponding to module b 302. In this embodiment, there are three sets of driving components 11, and all three sets of driving components 11 are preferably cylinders with magnetic switches 323. The first positioning pin 23 of the universal support positioning mechanism 23 is installed at the piston rod end of the first set of cylinders. That is, the first positioning pin 23 of the universal support positioning mechanism 23 can be driven to move vertically up and down through the first set of driving components 11.

[0039] Reference Figure 4 and Figure 6 In the general support positioning mechanism 24, there are two first positioning pins 23, and both first positioning pins 23 are installed at the piston rod end of the second set of cylinders. One first positioning pin 23 is inserted into a process hole on module b 302, and the other first positioning pin 23 is inserted into a process hole on module c 303. That is, the two first positioning pins 23 in the general support positioning mechanism 24 can be driven to move vertically and vertically synchronously through the second set of driving components 11. In the general support positioning mechanism 25, the first positioning pin 23 is installed at the piston rod end of the third set of cylinders. That is, the first positioning pin 23 in the general support positioning mechanism 25 can be driven to move vertically and vertically through the third set of driving components 11. The first positioning pin 23 in the general support positioning mechanism 25 is inserted into a process hole of module c 303.

[0040] Reference Figure 4 and Figure 7 For the C-module 303 of the C-pillar 30 of the vehicle body, the two sets of universal support positioning mechanisms 2 are named Universal Support Positioning Mechanism 2VI and Universal Support Positioning Mechanism 2VII, respectively. Universal Support Positioning Mechanism 2VI is located on the side of the C-module 303 closer to Universal Support Positioning Mechanism 2IV, and the first support block 22 in Universal Support Positioning Mechanism 2VI abuts against the lower surface of the C-module 303. Universal Support Positioning Mechanism 2VII is located at the end of the C-module 303 away from the B-module 302. There are two first support blocks 22 in Universal Support Positioning Mechanism 2VII, and the two first support blocks 22 in this position are symmetrically arranged on both sides of the C-module 303. Together with the first support block 22 in Universal Support Positioning Mechanism 2VI, they can ensure the stability of the C-module 303.

[0041] Reference Figure 5 , Figure 6 and Figure 7In this embodiment, each of the several sets of universal clamping mechanisms 7 includes a first clamping cylinder 71 and a first pressing block 72 installed at the piston rod end of the first clamping cylinder 71. The first clamping cylinder 71 is installed on the first fixed frame 21 in the universal support positioning mechanism 2 corresponding to the set of universal clamping mechanisms 7. The first pressing block 72 cooperates with the first support block 22 in the universal support positioning mechanism 2 corresponding to the set of universal clamping mechanisms 7. The difference between the multiple sets of universal clamping mechanisms 7 is that the number and installation position of the first pressing block 72 are different. The number of the first pressing block 72 in any set of universal clamping mechanisms 7 is the same as the number of the first support block 22 in its corresponding universal support positioning mechanism 2, and the installation positions correspond one-to-one.

[0042] Reference Figure 2 and Figure 8 The positioning and clamping mechanism 3 is used to position and clamp the C-pillar 30 of multiple models of the vehicle body. Therefore, the number of models of the positioning and clamping mechanism 3 installed on the tooling platform 1 is the same as the number of models of the C-pillar 30 of the vehicle body, and the structure is adapted one by one. In this embodiment, there are three models of the C-pillar 30 of the vehicle body, so the tooling platform 1 is also equipped with three models of positioning and clamping mechanisms 3. The three models of positioning and clamping mechanisms 3 all include a specific support positioning structure 31, a first drive component 32, and a specific clamping structure 33. The specific support positioning structure 31 is used to support the different structural components on the C-pillar 30 of multiple models of the vehicle body. The first drive component 32 is used to drive the specific support positioning structure 31 to slide in the direction away from or close to the C-pillar 30 of the vehicle body. In this embodiment, the sliding direction of the specific support positioning structure 31 is perpendicular to the C-pillar 30 of the vehicle body.

[0043] Reference Figure 2 and Figure 8 The first drive assembly 32 includes a first fixed seat 321 bolted to the tooling platform 1 and a first drive cylinder 322 mounted on the first fixed seat 321. In this embodiment, the first drive cylinder 322 is preferably configured as a cylinder with a magnetic switch 323, that is, a magnetic switch 323 is installed on the cylinder body of the first drive cylinder 322, a piston magnetic ring 324 is installed on the piston rod of the first drive cylinder 322, and the cylinder body of the first drive cylinder 322 is made of a non-magnetic material with weak magnetic conductivity. A specific support and positioning structure 31 is installed on the piston rod of the first drive cylinder 322. Specifically, the specific support and positioning structure 31 includes a second fixed bracket 311 fixed to the end of the piston rod of the first drive cylinder 322, a second support block 312 bolted to the first fixed seat 321, and a second positioning pin 313 bolted to the second fixed bracket 311. The upper end of the second support block 312 forms an abutment surface that fits against the outer wall of the C-pillar 30 of the vehicle body, and the second positioning pin 313 is inserted into the process hole on the C-pillar 30 of the vehicle body.

[0044] Reference Figure 2 and Figure 8 In addition, an extension plate 34 is bolted to the first fixed base 321. A buffer block 35 is fixed to the end of the extension plate 34 away from the first fixed base 321. A buffer block 36 is installed on the second fixed frame 311. The buffer block 36 and the buffer block 35 are configured to cooperate. In this embodiment, both the buffer block 35 and the buffer block 36 are made of rubber. When in use, when the first drive cylinder 322 drives the second fixed frame 311 to move, the buffer block 35 abuts against the buffer block 36 to limit the maximum movement distance of the second fixed frame 311. At the same time, the rubber material of the buffer block 35 and the buffer block 36 also has a certain buffering effect, ensuring that the process of the second support block 312 and the second positioning pin 313 approaching the C-pillar 30 of the vehicle body is more stable.

[0045] Reference Figure 2 and Figure 8 The number of specific clamping structures 33 is the same as the number of specific support positioning structures 31, and their positions correspond one-to-one. The specific clamping structure 33 is used to press the different structure on the C-pillar 30 of the vehicle body onto its corresponding specific support positioning structure 31. The specific clamping structure 33 includes a second clamping cylinder 331 installed on the first fixed seat 321 and a second pressing block 332 at the end of the piston rod of the second clamping cylinder 331. The second pressing block 332 cooperates with the second support block 312 in its corresponding specific support positioning structure 31. The difference between the multiple sets of specific clamping structures 33 is that the number and installation position of the second pressing block 332 are different, and the number of the second pressing block 332 in any set of specific clamping structures 33 is the same as the number of the second support block 312 in its corresponding specific support positioning structure 31, and their positions correspond one-to-one.

[0046] Reference Figure 2 and Figure 8 Both the first drive assembly 32 and the specific clamping structure 33 are electrically connected to the main control unit 6. In use, in the initial state, the positioning and clamping mechanisms 3 of the three models are all set away from the C-pillar 30 of the vehicle body. When the worker places the C-pillar 30 of a certain model on the universal support positioning mechanism 2, the model of the C-pillar 30 is automatically identified with the cooperation of the model identification unit 5 and the model marking unit 4. Then, the main control unit 6 controls the corresponding first drive assembly 32 to start first, so as to control the specific support positioning structure 31 of the corresponding model to move closer to the C-pillar 30 of the vehicle body, forming support for the different structure on the C-pillar 30 of the vehicle body. With the cooperation of the specific clamping structure 33 to press the C-pillar 30 of the vehicle body, the placement stability of the C-pillar 30 of multiple models can be ensured during the processing.

[0047] Reference Figure 2 and Figure 8The three models of positioning and clamping mechanisms 3 differ in the location of the specific support positioning structure 31 and the specific clamping structure 33. Specifically, for the positioning and clamping mechanism 3 adapted to the first model of the vehicle body C-pillar 30, this set of positioning and clamping mechanisms 3 is located at the location of the vehicle body C-pillar 30a module 301. For the positioning and clamping mechanism 3 adapted to the second model of the vehicle body C-pillar 30, this set of positioning and clamping mechanisms 3 is also located at the location of the vehicle body C-pillar 30a module 301, and the set of positioning and clamping mechanisms 3 corresponding to the first model of the vehicle body C-pillar 30 is respectively located on both sides of the vehicle body C-pillar 30, so as to ensure that the two sets of positioning and clamping mechanisms 3 do not interfere with each other when they are running separately. For the positioning and clamping mechanism 3 adapted to the third model of the vehicle body C-pillar 30, this set of positioning and clamping mechanisms 3 is located at the location of the vehicle body C-pillar 30c module 303.

[0048] Reference Figure 2 and Figure 9 The model identification unit 4 is pre-installed on the C-pillar 30 of the vehicle body. The number of types of model identification units 4 is the same as the number of models of the C-pillar 30 of the vehicle body and corresponds one-to-one. That is, each model of the C-pillar 30 of the vehicle body corresponds to one type of model identification unit 4. In this application, there are three models of the C-pillar 30 of the vehicle body, so there are three types of model identification units 4. Specifically, in this embodiment, the model identification unit 4 includes an identification block 41 and an inner support member 42. The identification block 41 is set as a rectangular metal block structure, and the inner support member 42 is set as a cover structure with folded edges. That is, during processing, the identification block 41 is fixed to the surface of the C-pillar 30 of the vehicle body by the inner support member 42. The inner support member 42 is fixed to the C-pillar 30 of the vehicle body by welding. That is, the identification block 41 and the inner support member 42 are processed into a process structure feature on the C-pillar 30 of the vehicle body that does not affect its normal functional structure, so that the inner support member 42 and the identification block 41 do not need to be removed after processing. In this embodiment, the identification block 41 is located on module a 301 of the C-pillar 30 of the vehicle body.

[0049] Reference Figure 9 and Figure 10An identification hole 43 is provided on the identification block 41. The position of the identification hole 43 is aligned with the process hole 1 on the C-pillar 30 of the vehicle body, that is, the identification hole 43 and the process hole 1 are connected, and the opening size of the identification hole 43 is smaller than the opening size of the process hole 1. The only difference between the various types of model identification units 4 is the opening size of the identification hole 43. In other words, the model identification unit 5 can determine the type of the corresponding model identification unit 4 by identifying the opening size of the identification hole 43, and thus determine the corresponding model of the C-pillar 30 of the vehicle body based on the type of the model identification unit 4. In addition, the model identification unit 4 should be set in the common structural area on the C-pillar 30 of various models of the vehicle body, and the model identification unit 5 is also installed on one of the universal support positioning mechanisms 2, so as to ensure that the model identification unit 5 can normally detect and identify the type of the model identification unit 4 regardless of which model of the C-pillar 30 of the vehicle body is processed.

[0050] Reference Figure 2 and Figure 10 In this application, the model identification unit 5 includes a first sliding seat 51, a first sensor 52, a detection pin 53, an elastic reset member 54, and a second drive assembly 55. The first sliding seat 51 is slidably disposed on the tooling platform 1. The first sensor 52 is mounted on the first sliding seat 51. The detection pin 53 slides on the first sliding seat 51, and the sliding direction of the detection pin 53 is parallel to the sliding direction of the first sliding seat 51. The elastic reset member 54 is disposed between the detection pin 53 and the first sliding seat 51. The elastic reset member 54 is used to drive the detection pin 53 to slide and reset. The second drive assembly 55 is mounted on the tooling platform 1 and is used to drive the first sliding seat 51 to slide.

[0051] Reference Figure 2 and Figure 10 The detection pin 53 is positioned directly opposite the marking hole 43. The first sensor 52 is located at the end of the detection pin 53 away from the marking hole 43. The first sensor 52 is electrically connected to the main control unit 6. The first sensor 52 is used to monitor the position of the end face of the detection pin 53 away from the marking hole 43 in real time. A detection plug 56 is fixed to the end of the detection pin 53 facing the marking hole 43. In this embodiment, the detection plug 56 is arranged in the shape of a round rod, and the diameter of the detection plug 56 is smaller than the diameter of the end of the detection pin 53 near the marking hole 43. In this application, the first sensor 52 is preferably set as a position sensor, and the number of first sensors 52 is one less than the number of models of the C-pillar 30 of the vehicle body. That is, in this embodiment, there are two first sensors 52, and the two first sensors 52 are arranged in a linear array on the first sliding seat 51. The detection head of the first sensor 52 is set towards the detection pin 53, and the first sensor 52 and the detection pin 53 are perpendicular to each other. The elastic reset member 54 is preferably set as a spring.

[0052] Reference Figure 10 and Figure 11 a. Regarding the three models of the C-pillar 30 of this application, the three types of marking blocks 41 in this embodiment are configured as follows: On the marking block 41 corresponding to the first model of the C-pillar 30, the opening diameter of the marking hole 43 is smaller than the diameter of the detection plug 56, or the marking block 41 corresponding to the C-pillar 30 of this model does not have a marking hole 43. That is to say, as the first sliding seat 51 slides closer to the C-pillar 30, the end of the detection plug 56 gradually abuts against the side wall of the marking block 41. Then the first sliding seat 51 continues to move. Under the restriction of the marking block 41, the elastic reset member 54 is compressed, and the detection pin 53 stops moving. Until the first sliding seat 51 moves to the maximum sliding distance, the two first sensors 52 simultaneously detect the position of the detection pin 53, which proves that the C-pillar 30 to be processed at this time is the first model.

[0053] Reference Figure 10 and Figure 11 b. On the marking block 41 corresponding to the C-pillar 30 of the second model, the opening diameter of the marking hole 43 is larger than the diameter of the detection plug 56 and smaller than the diameter of the end of the detection pin 53 near the marking hole 43. That is to say, as the first sliding seat 51 slides closer to the C-pillar 30 of the body, the end of the detection plug 56 gradually inserts into the side wall of the marking block 41 until the end of the detection pin 53 abuts against the side wall of the marking block 41. Then the first sliding seat 51 continues to move, the elastic reset member 54 is compressed, and the detection pin 53 stops moving. Until the first sliding seat 51 moves to the maximum sliding distance, only the first sensor 52 detects the position of the detection pin 53, which proves that the C-pillar 30 of the body to be processed at this time is the second model.

[0054] Reference Figure 10 and Figure 11 c. On the marking block 41 corresponding to the C-pillar 30 of the third model, the opening diameter of the marking hole 43 is larger than the diameter of the end of the detection pin 53 near the marking hole 43, or the marking block 41 is not set on the C-pillar 30 of this model. That is to say, as the first sliding seat 51 slides closer to the C-pillar 30, the detection plug 56 and the detection pin 53 pass through the marking hole 43 in sequence until the first sliding seat 51 moves to the maximum sliding distance, and the detection pin 53 stops moving. At this time, the elastic reset member 54 is not compressed, and neither of the two first sensors 52 can detect the position of the detection pin 53, which proves that the C-pillar 30 to be processed at this time is the third model.

[0055] Reference Figure 10 and Figure 12The second drive assembly 55 includes a second fixed seat 551 fixedly connected to the tooling platform 1 by bolts, a second drive cylinder 552 mounted on the second fixed seat 551, a first sliding seat 51 mounted on the piston rod end of the second drive cylinder 552, and a set of third positioning pins 57 fixed on the first sliding seat 51. The third positioning pins 57 are engaged with one of the process holes at the location of the marking block 41 on the a module 301 of the C-pillar of the vehicle body. In use, as the first sliding seat 51 drives the detection pin shaft 53 to move, the third positioning pin 57 also gradually approaches the C-pillar of the vehicle body. The third positioning pin 57 will first insert into the process hole 3 to form a preliminary positioning. Then the first sliding seat 51 continues to move, driving the detection pin shaft 53 to abut against the marking block 41 or insert into the marking hole 43, thereby completing the model identification process of the C-pillar of the vehicle body 30.

[0056] Reference Figure 2 and Figure 13 To ensure the accurate placement of the C-pillar 30 on the vehicle body, a lateral clamping and positioning structure 8 is also provided on the tooling platform 1. The lateral clamping and positioning structure 8 is located near the model identification unit 5. The lateral clamping and positioning structure 8 is used to clamp and position the area on the C-pillar 30 on the vehicle body where the model identification unit 4 is installed, thereby ensuring that the installation positions of the model identification unit 4 and the model identification unit 5 are aligned, so as to ensure the accuracy of the subsequent identification process of the model identification unit 5.

[0057] Reference Figure 2 and Figure 13 The lateral clamping and positioning structure 8 includes a front abutment assembly 81 and a rear abutment assembly 82 arranged opposite to each other. The front abutment assembly 81 includes a third fixed frame 811 mounted on the tooling platform 1, a third clamping cylinder 812 mounted on the third fixed frame 811, a third mounting seat 813 fixed to the movable end of the third clamping cylinder 812, a third drive cylinder 814 mounted on the third mounting seat 813, a second sliding seat 815 fixed to the piston rod end of the third drive cylinder 814, and a second sliding seat 815 fixed to the second sliding seat 815. The transverse abutment block 816 is located on the upper part of the vehicle body. The third drive cylinder 814 also adopts a cylinder with a magnetic switch 323, and its structure and operating principle are the same as those of the first drive cylinder 322. The end of the transverse abutment block 816 away from the second sliding seat 815 is used to abut against the outer wall of the C-pillar 30 of the vehicle body. Therefore, the shape of the end of the transverse abutment block 816 away from the second sliding seat 815 is adapted to the outer wall of the C-pillar 30 of the vehicle body. In addition, the third drive cylinder 814 can also be a double-acting cylinder with manual operation function for use by the staff during debugging.

[0058] Reference Figure 2 and Figure 13The rear abutment assembly 82 includes a fourth fixing bracket 821 bolted to the tooling platform 1, a fourth drive cylinder 822 mounted on the fourth fixing bracket 821, a third sliding seat 823 fixed to the piston rod end of the fourth drive cylinder 822, and a fourth positioning pin 824 mounted on the third sliding seat 823. The fourth drive cylinder 822 is also a cylinder with a magnetic switch 323. Two sets of fourth positioning pins 824 are provided, and both sets are located close to the model identification unit 5. 824 is engaged with the process hole at the location of the marking block 41 on the C-pillar 30 of the vehicle body; that is, when the a module 301 of the C-pillar 30 of the vehicle body is placed, the third sliding seat 823 is first driven by the fourth drive cylinder 822 to slide close to the C-pillar 30 of the vehicle body until the fourth positioning pin 824 is inserted into the process hole. Then, the third clamping cylinder 812 and the third drive cylinder 814 are pneumatically driven to drive the lateral abutment block 816 to press the a module 301 of the C-pillar 30 of the vehicle body against it, thereby achieving the clamping and positioning of the a module 301.

[0059] Reference Figure 13 and Figure 14 Furthermore, to avoid errors in the identification results due to the absence or forgetting to install the identification block 41, a second sensor 83 is also installed on the second sliding seat 815, with the probe of the second sensor 83 facing the C-pillar 30 of the vehicle body. Identification ear plates 44 are formed on both the inner support member 42 and the identification block 41. The identification ear plates 44 are used to cooperate with the second sensor 83 to determine whether the identification block 41 is installed. Specifically, when the second sliding seat 815 slides close to the C-pillar 30 of the vehicle body, it drives the second sensor 83 to move closer. If the second sensor 83 cannot detect the identification block 41 and the identification ear plate 44 on the inner support member 42, it proves that the corresponding identification block 41 is not installed on the C-pillar 30 of the vehicle body, thus sending a signal to remind the staff to check, and the second drive cylinder 552 stops running. Only when the second sensor 83 detects the identification ear plate 44 will the second drive cylinder 552 run normally and drive the detection pin shaft 53 to move, so as to identify the model of the C-pillar 30 of the vehicle body.

[0060] Reference Figure 2 and Figure 15To further ensure the quality of the C-pillar 30 machining, a position detection unit 9 is also provided on the tooling platform 1. The position detection unit 9 is used to detect whether the a module 301, b module 302, and c module 303 of the C-pillar 30 are placed. The position detection unit 9 includes several position sensors for detecting whether the workpiece is placed. The number of position sensors is the same as the number of modules of the C-pillar 30. Therefore, in this embodiment, three position sensors are set and are respectively set for a module 301, b module 302, and c module 303. The probes of the three position sensors are all set vertically upward. In this embodiment, one position sensor corresponding to a module 301 is installed on the third fixed frame 811, one position sensor corresponding to b module 302 is installed on the movable end of the drive component 11 corresponding to the module, and one position sensor corresponding to c module 303 is installed on the first fixed frame 21 in the general support positioning mechanism 25 corresponding to c module 303.

[0061] Reference Figure 2 Meanwhile, to facilitate workers placing the C-pillar 30 of the vehicle body on the universal support positioning mechanism 2, a guide positioning structure 10 is also provided on the tooling platform 1. The guide positioning structure 10 is used to guide the placement process of the C-pillar 30 of the vehicle body to achieve the initial positioning of the C-pillar 30 of the vehicle body. Specifically, in this embodiment, the guide positioning structure 10 includes several guide plates spaced apart around the C-pillar 30 of the vehicle body. The upper end of the guide plate is integrally formed with an inclined plate. That is, during the placement process of the C-pillar 30 of the vehicle body, the inclined plate on several guide plates guides the C-pillar 30 of the vehicle body, ensuring that the first positioning pin 23 can be quickly and accurately inserted into the corresponding process hole during the placement process of the three modules of the C-pillar 30 of the vehicle body.

[0062] Reference Figure 2 In addition, in this embodiment, a guide frame 20 is installed on the cylinder body of the first clamping cylinder 71, the second clamping cylinder 331 and the third clamping cylinder 812. The guide frame 20 is used to guide and restrict the placement position of the air supply pipe and the air outlet pipe of the corresponding cylinder, so as to avoid the air supply pipe and the air outlet pipe interfering with the normal operation of the welding fixture. The main control unit 6 includes a main air valve control that controls the on and off of the air circuit of all cylinders on this welding fixture, and a PLC (not shown in the figure) that controls the opening of all electronic components and the main air valve control. The PLC is electrically connected to the first sensor 52, the second sensor 83 and the position detection unit 9, thereby realizing the control of the positioning clamping mechanism 3, the general clamping mechanism 7 and the transverse clamping positioning structure 8.

[0063] A method for machining multiple workpiece models using a mixed-line machining process includes the following steps: S1. The staff pre-installs the identification block 41 on module a 301 in the C-pillar 30 of the vehicle body; S2. Place the C-pillar 30 of the vehicle body with the identification block 41 on the universal support and positioning mechanism 2. The universal support and positioning mechanism 2 performs initial support and positioning of the C-pillar 30 of the vehicle body. After placement, the three sets of position detection units 9 automatically identify whether the positions of the three modules of the C-pillar 30 of the vehicle body are correctly placed. After confirming that there is no error, control the universal clamping mechanism 7 to clamp and fix the C-pillar 30 of the vehicle body. If the placement position is detected to be incorrect, the main control unit 6 controls the entire device to stop operation and issues an alarm signal to raise the staff for inspection. S3. The area with the marker block 41 on module 301 of the C-pillar 30 of the vehicle body is clamped and positioned by the lateral clamping and positioning structure 8 to ensure that the subsequent inspection process is accurate. S4. After the model identification unit 5 identifies the model of the C-pillar 30 of the vehicle body corresponding to the identification block 41, the main control unit 6 controls the corresponding positioning clamping mechanism 3 to start according to the identified model of the C-pillar 30 of the vehicle body, thereby completing the secondary clamping and positioning of the C-pillar 30 of the vehicle body. S5. Perform welding operations. After welding is completed, the central control unit 6 controls the positioning and clamping mechanism 3 to return to its initial state. The worker removes the C-pillar 30 of the vehicle body and replaces the unwelded C-pillar 30. Then, repeat the above steps.

[0064] The implementation principle of this application embodiment is as follows: In use, the worker places the pre-installed marking blocks 41 on the welding fixture of the C-pillar 30a module 301, b module 302, and c module 303 of the vehicle body. Through the cooperation of several first positioning pins 23, the placement of the marking blocks 301, b module 302, and c module 303 is ensured to be accurate. During the process, three position sensors detect the marking blocks 301, b module 302, and c module 303 to ensure that they are placed correctly. Then, the second sensor 83 identifies the marking ear plate 44 on the marking block 41 and the inner support 42 to ensure that the marking block 41 is properly installed on the C-pillar 30 of the vehicle body. The model identification unit 5 detects the model of the C-pillar 30 of the vehicle body corresponding to the marking block 41, and then controls the corresponding specific clamping structure 33 and all general clamping mechanisms 7 to start according to the model, so as to stably clamp the three modules of the C-pillar 30 of the vehicle body onto the tooling platform 1. After that, welding operations can be carried out. The whole process only requires the worker to change the workpiece, which is more convenient to use and can also meet the purpose of mixed line processing.

[0065] The difference between Example 2 and Example 1 is that: Reference Figure 16In this embodiment, the detection plug 56 can be configured as a conical structure, and the larger end of the detection plug 56 can be detachably connected to the detection pin 53. The smaller end of the detection plug 56 is inserted into the marking hole 43. The minimum circular cross-sectional dimension of the detection plug 56 is smaller than the size of the marking hole 43, and the maximum circular cross-sectional dimension of the detection plug 56 is larger than the size of the process hole 1. In addition, in this embodiment, the first sensor 52 is configured as a distance sensor, and the first sensor 52 is coaxially arranged with the detection pin 53. The probe of the first sensor 52 faces the end face of the detection pin 53. Therefore, during the movement of the detection pin 53, the depth to which the detection plug 56 is inserted into the marking hole 43 varies depending on the opening size of the marking hole 43, that is, the movement distance of the detection pin 53 also varies. Thus, the model of the C-pillar 30 corresponding to the marking block 41 is determined by the position of the end face of the detection pin 53 checked by the first sensor 52. Compared with the results of embodiment 1, this embodiment has a wider range of applications and supports model detection in mixed-line processing of more models of C-pillar 30.

[0066] Furthermore, in this embodiment, the inner support member 42 is detachably connected to the C-pillar 30 of the vehicle body. Specifically, the inner support member 42 is positioned by means of the fourth positioning pin 824 in the rear abutment component 82 and is secured by the transverse abutment block 816 in the front abutment component 81. In other words, when the worker places module a 301 on the universal support positioning mechanism 2, the rear abutment component 82 is activated first, so that the fourth positioning pin 824 passes through the process hole of module a 301. Then, the marker block 41 is placed against the side wall of module a 301 and the inner support member 42 is installed, that is, it is hung on the fourth positioning pin 824 through the reserved mounting hole on the inner support member 42. After that, the front abutment component 81 is activated to clamp the inner support member 42, thereby limiting the marker block 41 through the inner support member 42, thus realizing the detachable connection of the inner support member 42.

[0067] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A welding fixture for mixed-model workpiece machining, characterized in that: The system includes a tooling platform (1), a universal support and positioning mechanism (2) set on the tooling platform (1) for supporting and positioning common structural components on C-pillars (30) of multiple models of car bodies, a positioning and clamping mechanism (3) set on the tooling platform (1) for positioning and clamping the C-pillars (30) of the car body, a model identification unit (4) pre-installed on the C-pillars (30) of the car body, a model recognition unit (5) set on the tooling platform (1), and a central control unit (6). The positioning and clamping mechanism (3) has multiple models, and the number of models of the positioning and clamping mechanism (3) is the same as the number of models of the C-pillars (30) of the car body and the structure is compatible. The model identification unit (4) has multiple types and corresponds one-to-one with the model of the C-pillars (30) of the car body. The model recognition unit (5) is used to detect the type of the model identification unit (4) and determine the corresponding model of the C-pillars (30) of the car body. The central control unit (6) controls the positioning and clamping mechanism (3) of the corresponding model to clamp the C-pillars (30) of the car body according to the model of the C-pillars (30).

2. The welding fixture for mixed-model workpiece machining according to claim 1, characterized in that: The positioning and clamping mechanism (3) includes a specific support positioning structure (31) set on the tooling platform (1) for supporting and positioning different structural components on the C-pillar (30) of multiple models of the vehicle body, a first drive assembly (32) for driving the specific support positioning structure (31) to move closer to or away from the C-pillar (30) of the vehicle body, and a specific clamping structure (33) for pressing the C-pillar (30) of the vehicle body onto the specific support positioning structure (31). The first drive assembly (32) and the specific clamping structure (33) are both electrically connected to the main control unit (6).

3. The welding fixture for mixed-model workpiece machining according to claim 1, characterized in that: The model identification unit (4) includes an identification block (41) set on the C-pillar (30) of the vehicle body and an inner support member (42) for fixing the identification block (41) on the C-pillar (30) of the vehicle body. The identification block (41) is provided with an identification hole (43) at the position of the process hole one of the C-pillar (30) of the vehicle body. The size of the identification hole (43) is smaller than the size of the process hole one. The size of the identification hole (43) of various types of model identification units (4) is different. The model identification unit (5) determines the corresponding C-pillar (30) model of the vehicle body by identifying the size of the identification hole (43).

4. The welding fixture for mixed-model workpiece machining according to claim 3, characterized in that: The model identification unit (5) includes a first sliding seat (51) slidably disposed on the tooling platform (1), a first sensor (52) disposed on the first sliding seat (51), a detection pin (53) slidably disposed on the first sliding seat (51), an elastic reset member (54) disposed on the first sliding seat (51) for driving the detection pin (53) to reset, and a second drive assembly (55) for driving the first sliding seat (51) to slide closer to or away from the C-pillar (30) of the vehicle body. The first sensor (52) is used to monitor the position of the end face of one end of the detection pin (53), and the other end of the detection pin (53) is provided with a detection plug (56) that cooperates with the marking hole (43).

5. A welding fixture for mixed-model workpiece machining according to claim 4, characterized in that: The detection plug (56) is tapered. The larger end of the detection plug (56) is connected to the detection pin (53). The minimum circular cross-sectional dimension of the detection plug (56) is smaller than the dimension of the marking hole (43), and the maximum circular cross-sectional dimension of the detection plug (56) is larger than the dimension of the process hole.

6. A welding fixture for mixed-model workpiece machining according to claim 1, characterized in that: The tooling platform (1) is provided with a universal clamping mechanism (7), which is provided in relation to the universal support and positioning mechanism (2), and the universal clamping mechanism (7) is used to press the C-pillar (30) of the vehicle body onto the universal support and positioning mechanism (2).

7. A welding fixture for mixed-model workpiece machining according to claim 1, characterized in that: The tooling platform (1) is provided with a horizontal clamping and positioning structure (8) at the position corresponding to the model identification unit (5). The horizontal clamping and positioning structure (8) is used to ensure that the model identification unit (4) and the model identification unit (5) are aligned in the installation position.

8. A welding fixture for mixed-model workpiece machining according to claim 1, characterized in that: The universal support and positioning mechanism (2) includes a first fixed frame (21) fixed on the tooling platform (1), a first support block (22) set on the first fixed frame (21), and a first positioning pin (23) set on the tooling platform (1). One end of the first support block (22) abuts against the surface of the C-pillar (30) of the vehicle body; the first positioning pin (23) is inserted into the process hole on the C-pillar (30) of the vehicle body.

9. A welding fixture for mixed-model workpiece machining according to claim 1, characterized in that: The tooling platform (1) is equipped with a position detection unit (9) for detecting whether the component modules of the C-pillar (30) of the vehicle body are placed in place.

10. A method for mixed-model workpiece machining, implemented using the welding fixture for mixed-model workpiece machining as described in any one of claims 1 to 9, characterized in that, Includes the following steps: S1. Install a marker block (41) on the C-pillar (30) of the vehicle body; S2. The C-pillar (30) of the vehicle body is initially positioned by the universal support positioning mechanism (2), and the position detection unit (9) automatically identifies whether the position of the C-pillar (30) of the vehicle body is correctly placed. If it is correct, the universal clamping mechanism (7) is controlled to clamp the C-pillar (30) of the vehicle body. S3. The area with the marker block (41) on the C-pillar (30) of the vehicle body is clamped and positioned by the lateral clamping and positioning structure (8); S4. After the model identification unit (5) identifies the model of the C-pillar (30) of the vehicle body corresponding to the identification block (41), the main control unit (6) controls the positioning clamping mechanism (3) of the corresponding model to start, and completes the secondary clamping and positioning of the C-pillar (30) of the vehicle body. S5. Perform welding operations.

Images