Flexible clamp of automobile auxiliary frame machining center

Abstract

The invention relates to a flexible clamp of an automobile auxiliary frame machining center, and relates to the field of automobile manufacturing equipment. The machining center comprises a machining center body and a clamping component, the clamping component is detachably assembled on a three-dimensional tool platform of the machining center body, the clamping component is used for clamping an automobile auxiliary frame workpiece to be machined, the clamping component comprises a bottom plate, a supporting assembly and a clamping assembly, the bottom plate is fixedly and detachably assembled on the three-dimensional tool platform of the machining center body, and the supporting assembly is fixedly and detachably assembled on the three-dimensional tool platform of the machining center body. And supporting assemblies are symmetrically mounted on the front, back, left and right sides of the top surface of the bottom plate. Through the self-adaptive inner supporting type clamping design of the clamping assembly, stable clamping of the interior of the auxiliary frame is achieved, and the problems that clamping force is unstable and rigidity is insufficient are solved; and through precise locking of the locking hydraulic cylinder, the stability of the positioning precision in the machining process is guaranteed.

Description

Technical Field

[0001] This application relates to the technical field of automotive manufacturing equipment, and in particular to a flexible fixture for an automotive subframe machining center. Background Technology

[0002] As a core load-bearing component of the automotive chassis system, the machining accuracy of the automotive subframe directly determines the vehicle's driving stability, handling safety, and chassis assembly compatibility. It is an indispensable key link in the automotive manufacturing process. In the field of automotive subframe machining, fixtures, as the core tooling for positioning and clamping workpieces, directly affect production line capacity, processing quality, and overall production costs due to their adaptability, accuracy, and switching efficiency. They are key factors restricting the large-scale and multi-variety production of subframes. Currently, most fixtures used in automotive subframe machining are specially designed, with their structure, positioning references, and clamping methods tailored to a single subframe model. A single fixture can only adapt to one specification and one model of subframe workpiece, exhibiting strong specialization. With the rapid growth of personalized and diversified demands in the automotive consumer market and the accelerating pace of automotive model iteration, the limitations of traditional special fixtures are becoming increasingly apparent as a single production line needs to be compatible with mixed-line processing of multiple models and specifications of subframes.

[0003] Because traditional dedicated fixtures cannot be adapted to the processing of multiple subframe models, the production line needs to frequently disassemble and replace the entire set of fixtures when switching between different product models. The disassembly, installation and debugging of fixtures is cumbersome and often takes a lot of time, resulting in a significant increase in production line downtime and a significant decrease in production efficiency, making it difficult to meet the production needs of multiple varieties and fast pace. In order to cope with the needs of mixed-line processing of multiple subframe models, the existing fixtures are manually adjusted. The positions of the positioning pins and clamping blocks are adjusted to adapt to different workpiece models. This method does not require additional investment in fixture costs.

[0004] Regarding the aforementioned technologies, the inventors discovered that existing manual adjustments are difficult to control in terms of precision, easily leading to problems such as positioning deviations and unstable clamping forces. This results in insufficient machining precision of the subframe, which in turn causes quality hazards such as excessive assembly gaps and substandard structural strength. While adjustable fixtures have a certain model compatibility capability, their complex structural design makes them prone to problems such as positioning reference offsets and insufficient clamping rigidity during adjustment, making it difficult to guarantee the high precision requirements for subframe machining. In particular, they cannot meet the positioning requirements of precision machining processes such as subframe welding and drilling. On the other hand, automated adjustable systems with high precision have high equipment investment costs, creating a dilemma of insufficient precision and excessive cost. Summary of the Invention

[0005] To overcome the problems of insufficient machining accuracy of the subframe due to the difficulty in controlling the precision of existing manual adjustments, which easily leads to positioning deviations and unstable clamping forces, resulting in quality hazards such as excessive assembly gaps and substandard structural strength, while adjustable fixtures have a certain model compatibility capability, their complex structural design makes them prone to problems such as positioning reference deviation and insufficient clamping rigidity during adjustment, making it difficult to guarantee the high precision requirements of subframe machining, especially unable to meet the positioning requirements of precision machining processes such as subframe welding and drilling. On the other hand, high-precision automated adjustable systems have high equipment investment costs, creating a dilemma of insufficient precision and excessive cost. This application provides a flexible fixture for automotive subframe machining centers.

[0006] The flexible fixture for an automotive subframe machining center provided in this application adopts the following technical solution:

[0007] A flexible fixture for an automotive subframe machining center includes a machining center body and clamping components. The clamping components are detachably assembled on a three-dimensional tooling platform of the machining center body and are used to clamp the automotive subframe workpiece to be processed. The clamping components include a base plate, support components, and clamping components. The base plate is fixedly and detachably assembled on the three-dimensional tooling platform of the machining center body. Support components are symmetrically installed on the front, back, left, and right sides of the top surface of the base plate and are used to support the automotive subframe workpiece to be processed. Two clamping components are symmetrically arranged on the left and right sides of the center of the top surface of the base plate and are used to press the interior of the automotive subframe workpiece to be processed.

[0008] By adopting the above technical solution, a base plate is installed and fixed to the three-dimensional tooling platform of the machining center body, providing a stable support surface for the automotive subframe workpiece. This ensures that the workpiece will not move during processing, guaranteeing machining accuracy and quality. The support components, symmetrically installed on the front, rear, left, and right sides of the base plate, provide uniform support to the automotive subframe workpiece from multiple directions, effectively distributing the workpiece's weight and preventing deformation due to excessive localized stress. The clamping components are symmetrically positioned in the center of the top surface of the base plate, pressing along the internal contour of the automotive subframe workpiece to achieve precise and stable pressure distribution, avoiding both excessive tightness and looseness. This not only effectively fixes the workpiece but also prevents damage due to excessive tightness or displacement due to excessive looseness. In this way, the clamping components effectively compress and fix the workpiece, ensuring its fixed and stable position during processing. Through the coordinated technical features of the base plate, support components, and clamping components, stable support and precise fixation of the workpiece are achieved during the machining of the automotive subframe, improving machining accuracy and quality, as well as enhancing processing efficiency and safety.

[0009] Optionally, the bottom surface of the base plate is vertically fixed with assembly slide bars on both the left and right sides, and the assembly slide bars are used to assemble on the three-dimensional tooling platform of the machining center body. The top front, back and left and right sides of the base plate are symmetrically provided with first slide rails, and the middle of the top front, back and left and right sides of the base plate is provided with adjustment grooves. Adjustment screws are rotatably connected through the first slide rails on the top front, back and left and right sides of the base plate.

[0010] By adopting the above technical solution, the assembly slide bars, which can be vertically fixed to the left and right sides of the bottom surface of the base plate, can be stably assembled on the three-dimensional tooling platform of the machining center body. This ensures the base plate is firmly fixed to the machining center body, guaranteeing the stability of the entire tooling platform. The first slide rail, symmetrically positioned front-to-back and left-to-right sides, allows the adjusting screw to pass through and rotate. Specifically, when the adjusting screw rotates in the first slide rail, the position of the base plate in three-dimensional space can be finely adjusted, achieving precise alignment and positioning of the workpiece. The adjusting groove, located in the middle of the front-to-back and left-to-right sides of the top of the base plate, provides mounting holes for the adjusting screw, making the adjustment process more convenient. Thus, by adjusting the adjusting screw in the adjusting groove, the position of the base plate can be precisely adjusted. Specifically, combined with the layout design of the first slide rail and the adjusting groove, the adjusting screw can provide precise adjustment in different directions, allowing the base plate to adapt to workpieces of different sizes and shapes, and ensuring their precise alignment on the machining center body.

[0011] Optionally, the support assembly includes a screw hole slider, a slide frame, and a top column. The screw hole slider is horizontally slidably assembled in the first slide rail, and a lifting hydraulic cylinder is vertically fixed on the top surface of the screw hole slider. The screw hole slider and the adjusting screw are threadedly assembled together. A slide frame is provided above the lifting hydraulic cylinder, and an extension slide is horizontally slidably assembled in the slide frame. A top column is vertically fixed on the top surface of the extension slide, and the top column is used to support the automotive subframe workpiece to be processed.

[0012] By adopting the above technical solution and incorporating the technical features of the screw-hole slider, sliding frame strip, and top column, the support assembly can precisely support and adjust the automotive subframe workpiece. Specifically, the horizontal sliding design of the screw-hole slider in the first slide rail allows the support assembly to be precisely positioned in the horizontal direction, improving the positioning accuracy of the workpiece. The lifting hydraulic cylinder adjusts its stroke to raise and lower the support assembly in the vertical direction, thus adapting to workpieces of different shapes and sizes. The threaded connection between the adjusting screw and the screw-hole slider ensures a more stable horizontal position for the slider, further enhancing the stability of the support assembly. The sliding fit design between the sliding frame strip and the extension slide allows for fine-tuning of the top column in the horizontal direction, precisely adjusting the contact position with the frame workpiece and ensuring accurate support. The top column directly supports the frame workpiece, and its precise position adjustment ensures the workpiece's stability during processing, reducing errors caused by workpiece instability.

[0013] Optionally, a rotating shaft is vertically fixed on the bottom surface of one end of the slide frame, and a driven gear is horizontally fixed on the outer wall of the rotating shaft. An extension hydraulic cylinder is horizontally fixed on one end of the slide frame, and the output end of the extension hydraulic cylinder is fixed on the extension slide block.

[0014] By adopting the above technical solution, and by setting a rotating shaft and a driven gear, since the rotating shaft is fixed to the bottom surface of one end of the slide frame and is vertically set, and the driven gear is fixed to the outer wall of the rotating shaft and is horizontally set, when the slide frame moves, the rotating shaft will rotate around its own axis, and the driven gear will also rotate accordingly, realizing the integrated dynamic movement and rotation of the slide frame. By setting an extension hydraulic cylinder and fixing its output end to the extension slide block, since the extension hydraulic cylinder has the power function to provide linear motion, it can push the extension slide block to move along the length direction of the slide frame when subjected to external force.

[0015] Optionally, a rotating seat is vertically fixed to the top of the lifting hydraulic cylinder, and the rotating seat is rotatably connected to the rotating shaft at the bottom of the slide frame bar. An angle adjustment motor is vertically fixed to one side of the rotating seat, and a drive gear is horizontally fixed to the top of the angle adjustment motor, and the drive gear meshes with the driven gear.

[0016] By adopting the above technical solution, and by setting a rotating base vertically fixed at the top of the lifting hydraulic cylinder, and by rotatably connecting the rotating base to the rotating shaft at the bottom of the slide frame, the slide frame can rotate within a certain angle range. Specifically, an angle adjustment motor is vertically fixed on one side of the rotating base, a drive gear is horizontally fixed at the top of the motor, and a driven gear meshing with it is fixed at one end of the rotating shaft. The motor drives the drive gear to rotate, thereby causing the driven gear to rotate.

[0017] Optionally, a double-headed locking hydraulic cylinder is horizontally fixed inside the adjustment groove of the base plate, and locking pins are horizontally fixed at both output ends of the locking hydraulic cylinder. Locking slots are horizontally fixed at the ends of the adjusting screws near the locking hydraulic cylinder, and the locking slots are limited and inserted into the locking pins at the output ends of the locking hydraulic cylinder.

[0018] By adopting the above technical solution, and by setting up a double-headed locking hydraulic cylinder and locking pins, as well as a locking slot on the adjusting screw, these technical features enable rapid positioning and locking of the base plate without direct manual operation. Therefore, they achieve efficient locking adjustment, thereby improving ease of use and operational efficiency. Specifically, when the double-headed locking hydraulic cylinder is activated, its two output ends simultaneously extend locking pins. These locking pins can be inserted into the locking slots on the adjusting screw, thereby achieving automatic locking of the base plate.

[0019] Optionally, a second slide rail is symmetrically provided in the middle of the top surface of the base plate, and an adjustment groove is provided in the middle of the top surface of the base plate. An adjustment hydraulic cylinder is symmetrically and horizontally fixed inside the adjustment groove of the base plate, and the output end of the adjustment hydraulic cylinder is inserted through the second slide rail.

[0020] By adopting the above technical solution, and by setting up a second slide rail in conjunction with the use of an adjusting groove, precise positioning of the equipment can be achieved through an adjusting hydraulic cylinder that is horizontally fixed within the adjusting groove. This is because the adjusting hydraulic cylinder provides the driving force, while the second slide rail provides the necessary movement path. When the adjusting hydraulic cylinder operates, its output end transmits its internal driving force to the second slide rail, thereby achieving precise vertical movement or positioning of the equipment.

[0021] Optionally, the clamping assembly includes a sliding plate, a pressing hydraulic cylinder, and a support frame. The sliding plate is horizontally slidably assembled in the second slide rail, and the sliding plate is fixedly assembled with the output end of the adjusting hydraulic cylinder. The pressing hydraulic cylinder is vertically fixed on the top surface of the sliding plate, and the top output end of the pressing hydraulic cylinder is vertically fixed with a support frame. A support platform is vertically fixed inside the support frame, and a deflection motor is vertically fixed on the top surface of the support platform. The output end of the deflection motor is horizontally fixed with a pressing bar, and both ends of the pressing bar are fixed with pressure seats.

[0022] By adopting the above technical solution and incorporating the technical features of the sliding plate, the downward hydraulic cylinder, the support frame, the deflection motor, and the downward pressure bar, the design of these features enables the entire clamping assembly to accurately control the up-down and left-right movement of the target object, thereby achieving efficient and accurate clamping and fixation. The sliding plate is located in the second slide rail and is fixedly connected to the sliding plate by adjusting the output end of the hydraulic cylinder, allowing it to slide horizontally and precisely adjust the position of the clamping assembly. This sliding mechanism allows the clamping assembly to be flexibly adjusted as needed, improving the convenience and accuracy of operation. On the other hand, the downward hydraulic cylinder is vertically fixed to the sliding plate, and its top output end is fixed to the support frame, allowing precise control of the up-down position of the support frame and its internal components by controlling the extension and retraction of the downward hydraulic cylinder. Thus, by adjusting the downward hydraulic cylinder, appropriate downward pressure can be applied to the target object, ensuring that the target object is clamped and fixed in the required position. In addition, a deflection motor is fixed on the support platform inside the support frame. The output end of the deflection motor is connected to the lower pressure bar, and pressure seats are fixed at both ends of the lower pressure bar. In this way, by controlling the rotation direction of the deflection motor, the position and angle of the pressure seats can be adjusted in the horizontal direction to achieve flexible clamping of target objects of different shapes and sizes.

[0023] Optionally, both sides of the support frame are horizontally fixed with hydraulic cylinders, and the external output end of the hydraulic cylinders is fixed with a pressing plate, and the outer end face of the pressing plate is horizontally fixed with a guide post.

[0024] By adopting the above technical solution, and by setting up a hydraulic cylinder for pressure resistance and a pressing plate, the hydraulic cylinder for pressure resistance can provide precise thrust control, thus achieving the function of precisely applying pressure. Specifically, when the hydraulic cylinder for pressure resistance receives a control signal, it drives the pressing plate to perform a pressing movement in the horizontal direction.

[0025] Optionally, a push-pull slip ring is horizontally slidably sleeved on the guide post, and a push-pull hydraulic cylinder is horizontally fixed at the end of the guide post away from the extrusion plate. The output end of the push-pull hydraulic cylinder is fixed on the push-pull slip ring. Both the upper and lower ends of the guide post near the extrusion plate are hinged with deflection arms, and both the upper and lower ends of the guide post are horizontally provided with pressure plates. Both the upper and lower ends of the push-pull slip ring are hinged with deflection arms, and the two sides of the pressure plates are respectively hinged to the adjacent deflection arms.

[0026] By adopting the above technical solution, a guide post and a push-pull slip ring are set up. The push-pull slip ring is horizontally slidably fitted on the guide post, allowing it to move horizontally on the guide post. Since a push-pull hydraulic cylinder is horizontally fixed at the end of the guide post away from the extrusion plate, and the output end of the push-pull hydraulic cylinder is fixed to the push-pull slip ring, the reciprocating motion of the push-pull hydraulic cylinder can be directly transmitted to the push-pull slip ring, thereby driving it to move horizontally on the guide post. Simultaneously, deflection arms are hinged to both the upper and lower ends of the guide post near the extrusion plate, and pressure plates are horizontally set at both ends of the guide post, allowing the sides of the pressure plates to be hinged to adjacent deflection arms. The upper and lower ends of the push-pull slip ring are also hinged to the deflection arms. This design allows the horizontal reciprocating motion of the push-pull slip ring to be transmitted to the extrusion plate through the deflection arms and pressure plates. Therefore, when the push-pull hydraulic cylinder operates, the guide post drives the push-pull slip ring and the extrusion plate to move up and down together, achieving the extrusion or release action.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] This flexible fixture for automotive subframe machining centers utilizes a collaborative design that combines modular, detachable assembly, multi-dimensional adjustable support, adaptive internal clamping, and precise locking positioning. It specifically addresses the core pain points of traditional dedicated fixtures, such as their inability to adapt to multiple subframe models, long downtime during model changes, insufficient precision in manual adjustments, unstable clamping force, the contradiction between accuracy and cost in adjustable fixtures, and insufficient rigidity and switching reliability in modular fixtures. This fixture achieves precise positioning, stable clamping, and rapid model changeover adaptation for different automotive subframe models, ensuring subframe machining accuracy, improving production efficiency, reducing overall costs, and adapting to the needs of multi-variety, high-speed mixed-line machining. Firstly, it completes the overall assembly and basic positioning of the fixture, laying the foundation for precise machining and enabling rapid docking between the fixture and the machining center, avoiding... The traditional fixtures are cumbersome to disassemble and replace. Secondly, based on the model and specifications of the automotive subframe to be processed, the support components are precisely adjusted and locked in multiple dimensions to achieve stable support and precise positioning of the subframe, solving the problems of insufficient precision in manual adjustment and positioning reference deviation. Then, the position adjustment of the clamping components and adaptive internal support clamping are completed to achieve precise compression and fixation inside the subframe, solving the problems of unstable clamping force and insufficient rigidity of traditional fixtures, ensuring that the workpiece does not shift or deform during processing. Subsequently, all structures work together to start the machining center body to carry out subframe machining operations, ensuring processing stability and accuracy throughout the process, while also enabling rapid model changeover. Finally, after the subframe machining operation is completed, the clamps and supports are released, and the fixtures are reset, facilitating subsequent continuous production.

[0029] In summary, the flexible fixture of this automotive subframe machining center works collaboratively across all its structures. By assembling sliding bars, it enables rapid and detachable docking of the clamping components with the machining center body, solving the problem of cumbersome changeovers in traditional fixtures. Through the multi-dimensional adjustable design of the support components, it achieves precise support and positioning for different subframe models, addressing the pain points of insufficient precision and positioning reference offset caused by manual adjustments. The adaptive internal support clamping design of the clamping components ensures stable clamping within the subframe, resolving issues of unstable clamping force and insufficient rigidity. Finally, the precise locking of the locking hydraulic cylinder ensures the stability of positioning accuracy during machining. Attached Figure Description

[0030] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the flexible fixture for an automotive subframe machining center;

[0031] Figure 2 This is a schematic diagram of the overall structure of the clamping components in an embodiment of the flexible fixture for an automotive subframe machining center;

[0032] Figure 3 This is a schematic diagram of the overall structure in the disassembled state of the flexible fixture embodiment for the automotive subframe machining center;

[0033] Figure 4 This is a schematic diagram of the base plate in the disassembled state in an embodiment of the flexible fixture for an automotive subframe machining center;

[0034] Figure 5 This is a schematic diagram of the clamping components in the disassembled state in an embodiment of the flexible fixture for an automotive subframe machining center;

[0035] Figure 6 This is a schematic diagram of the support frame in the disassembled state in an embodiment of the flexible fixture for an automotive subframe machining center;

[0036] Figure 7 This is a schematic diagram of the guide post in its disassembled state in an embodiment of the flexible fixture for an automotive subframe machining center;

[0037] Figure 8 This is a schematic diagram of the support assembly in the disassembled state in an embodiment of the flexible fixture for an automotive subframe machining center.

[0038] Explanation of reference numerals in the attached drawings: 1. Machining center body; 2. Clamping component; 21. Base plate; 211. Assembled slide bar; 212. First slide rail; 213. Adjustment groove; 214. Adjustment screw; 215. Second slide rail; 216. Adjustment hydraulic cylinder; 217. Locking hydraulic cylinder; 218. Locking pin; 219. Locking slot; 22. Support assembly; 221. Screw hole slider; 222. Lifting hydraulic cylinder; 223. Rotary seat; 224. Slide frame bar; 225. Rotating shaft; 2251. Driven gear; 226. 227. Extension hydraulic cylinder; 228. Extension slide; 229. Top column; 220. Angle adjustment motor; 2291. Drive gear; 23. Clamping assembly; 231. Slide plate; 232. Downward hydraulic cylinder; 233. Support frame; 234. Support platform; 235. Deflection motor; 236. Downward pressure bar; 237. Pressure seat; 238. Pressing hydraulic cylinder; 239. Extrusion plate; 2391. Guide column; 2392. Push-pull slip ring; 2393. Deflection arm; 2394. Pressing plate; 2395. Push-pull hydraulic cylinder. Detailed Implementation

[0039] The present application will be further described in detail below with reference to the accompanying drawings.

[0040] This application discloses a flexible fixture for an automotive subframe machining center. (Refer to...) Figure 1 , Figure 2 and Figure 3 A flexible fixture for an automotive subframe machining center includes a machining center body 1 and a clamping component 2. The clamping component 2 is detachably assembled on a three-dimensional tooling platform of the machining center body 1 and is used to clamp the automotive subframe workpiece to be processed. The clamping component 2 includes a base plate 21, a support assembly 22, and a clamping assembly 23. The base plate 21 is fixedly and detachably assembled on the three-dimensional tooling platform of the machining center body 1, and the support assembly 22 is symmetrically installed on the front, back, left, and right sides of the top surface of the base plate 21. The support assembly 22 is used to support the automotive subframe workpiece to be processed. Two clamping assemblies 23 are symmetrically arranged on the left and right sides of the middle of the top surface of the base plate 21 and are used to squeeze the interior of the automotive subframe workpiece to be processed.

[0041] By adopting the above technical solution, the base plate 21 is fixed on the three-dimensional tooling platform of the machining center body 1, providing a stable support surface for the automotive subframe workpiece. This ensures that the workpiece will not move during processing, guaranteeing machining accuracy and quality. The support assembly 22, symmetrically installed on the front, rear, left, and right sides of the base plate 21, provides uniform support to the automotive subframe workpiece from multiple directions, effectively distributing the workpiece's weight and preventing deformation due to excessive localized stress. The clamping assembly 23, symmetrically positioned at the center of the top surface of the base plate 21, compresses along the internal contour of the automotive subframe workpiece, achieving precise and stable pressure distribution without being too tight or too loose. This not only effectively fixes the workpiece but also prevents damage due to excessive tightness or displacement due to excessive looseness. In this way, the clamping assembly 23 effectively compresses and fixes the workpiece, ensuring its position is fixed and stable during processing. Through the coordinated use of technical features such as the base plate 21, the support assembly 22, and the clamping assembly 23, stable support and precise fixation of the workpiece are achieved during the processing of the automotive subframe, improving the accuracy and quality of processing, as well as enhancing processing efficiency and safety.

[0042] Reference Figure 4The base plate 21 has vertically fixed assembly slide bars 211 on both the left and right sides of its bottom surface. These slide bars 211 are used for assembly onto the three-dimensional tooling platform of the machining center body 1. The base plate 21 has symmetrically provided first slide rails 212 on its top front, back, left, and right sides. An adjustment groove 213 is provided through the middle of the top front, back, left, and right sides of the base plate 21. Adjustment screws 214 are rotatably connected through the first slide rails 212 on the top front, back, left, and right sides of the base plate 21. By setting the assembly slide bars 211 vertically fixed on both sides of the bottom surface of the base plate 21, it can be stably assembled onto the three-dimensional tooling platform of the machining center body 1. This ensures the base plate 21 is firmly fixed to the machining center body 1, guaranteeing the stability of the entire tooling platform. The first slide rails 212, being symmetrically provided on the front, back, left, and right sides, allow the adjustment screws 214 to pass through and rotate. Specifically, when the adjusting screw 214 rotates in the first slide rail 212, the position of the base plate 21 in three-dimensional space can be finely adjusted, thereby achieving precise alignment and positioning of the workpiece. By setting the technical feature of the adjusting groove 213, which is located in the middle of the front, back, left, and right sides of the top of the base plate 21, mounting holes for the adjusting screw 214 are provided, making the adjustment process more convenient. Thus, by adjusting the adjusting screw 214 in the adjusting groove 213, the position of the base plate 21 can be precisely adjusted. Specifically, combined with the layout design of the first slide rail 212 and the adjusting groove 213, the adjusting screw 214 can provide precise adjustment in different directions, enabling the base plate 21 to adapt to workpieces of different sizes and shapes, and ensuring its precise alignment on the machining center body 1.

[0043] Reference Figure 3 , Figure 4 and Figure 8The support assembly 22 includes a screw-hole slider 221, a sliding frame 224, and a top post 228. The screw-hole slider 221 is horizontally slidably assembled in the first slide rail 212, and a lifting hydraulic cylinder 222 is vertically fixed on the top surface of the screw-hole slider 221. The screw-hole slider 221 is threadedly assembled with an adjusting screw 214. The sliding frame 224 is located above the lifting hydraulic cylinder 222, and an extension slide 227 is horizontally slidably assembled in the sliding frame 224. A top post 228 is vertically fixed on the top surface of the extension slide 227, and the top post 228 is used to support the automotive subframe workpiece to be processed. By setting the technical features of the screw-hole slider 221, the sliding frame 224, and the top post 228, the support assembly can accurately support and adjust the automotive subframe workpiece. Specifically, the horizontal sliding design of the screw-hole slider 221 in the first slide rail 212 enables the support assembly to be accurately positioned in the horizontal direction, improving the positioning accuracy of the workpiece. The function of the lifting hydraulic cylinder 222 is to adjust the vertical movement of the support assembly by adjusting its stroke, thereby adapting to workpieces of different shapes and sizes. Because the adjusting screw 214 and the threaded slider 221 are threaded together, the horizontal position of the slider 221 is more stable, further enhancing the stability of the support assembly. The sliding fit design between the slide frame 224 and the extension slide 227 allows the top column 228 to be finely adjusted horizontally, thereby precisely adjusting the contact position with the chassis workpiece and ensuring accurate support. The top column 228 directly supports the chassis workpiece, and its precise position adjustment ensures the stability of the workpiece during processing, reducing errors caused by workpiece instability. A rotating shaft 225 is vertically fixed to the bottom surface of one end of the slide frame 224, and a driven gear 2251 is horizontally fixed to the outer wall of the rotating shaft 225. An extension hydraulic cylinder 226 is horizontally fixed to one end of the slide frame 224, and the output end of the extension hydraulic cylinder 226 is fixed to the extension slide 227. By setting up a rotating shaft 225 and a driven gear 2251, since the rotating shaft 225 is fixed to the bottom surface of one end of the slide frame 224 and is vertically arranged, and the driven gear 2251 is fixed to the outer wall of the rotating shaft 225 and is horizontally arranged, when the slide frame 224 moves, the rotating shaft 225 will rotate around its own axis, and the driven gear 2251 will also rotate accordingly, realizing the integrated dynamic movement and rotation of the slide frame. By setting up an extension hydraulic cylinder 226 and its output end fixed on the extension slide block 227, since the extension hydraulic cylinder 226 has the power function to provide linear motion, it can push the extension slide block 227 to move along the length direction of the slide frame 224 when subjected to external force. The top of the lifting hydraulic cylinder 222 is vertically fixed with a rotating seat 223, and the rotating seat 223 is rotatably connected to the rotating shaft 225 at the bottom of the sliding frame 224. An angle adjusting motor 229 is vertically fixed on one side of the rotating seat 223, and a drive gear 2291 is horizontally fixed on the top of the angle adjusting motor 229, and the drive gear 2291 meshes with the driven gear 2251.By setting a rotating base 223 vertically fixed at the top of the lifting hydraulic cylinder 222, and rotatably connecting the rotating base 223 to the rotating shaft 225 at the bottom of the sliding frame 224, the sliding frame 224 can rotate within a certain angle range. Specifically, an angle adjustment motor 229 is vertically fixed on one side of the rotating base 223, and a drive gear 2291 is horizontally fixed at the top of the motor. A driven gear 2251 meshing with the drive gear 2291 is fixed at one end of the rotating shaft 225. The motor drives the drive gear 2291 to rotate, thereby driving the driven gear 2251 to rotate. A double-headed locking hydraulic cylinder 217 is horizontally fixed inside the adjustment groove 213 of the base plate 21, and locking pins 218 are horizontally fixed at both output ends of the locking hydraulic cylinder 217. Locking slots 219 are horizontally fixed at the ends of the adjusting screw 214 near the locking hydraulic cylinder 217, and the locking slots 219 are inserted into the locking pins 218 at the output ends of the locking hydraulic cylinder 217 for limiting. By incorporating a dual-headed locking hydraulic cylinder 217, locking pins 218, and a locking slot 219 on the adjusting screw 214, these technical features enable rapid positioning and locking of the base plate 21 without direct manual operation, thus achieving efficient locking adjustment and improving ease of use and operational efficiency. Specifically, when the dual-headed locking hydraulic cylinder 217 is activated, its two output ends simultaneously extend the locking pins 218, which can be inserted into the locking slots 219 on the adjusting screw 214, thereby achieving automatic locking of the base plate 21.

[0044] Reference Figure 4 A second slide rail 215 is symmetrically provided in the center of the top surface of the base plate 21, and an adjustment groove 213 is also provided in the center of the top surface of the base plate 21. A hydraulic cylinder 216 is symmetrically and horizontally fixed inside the adjustment groove 213 of the base plate 21, and the output end of the hydraulic cylinder 216 is inserted through the second slide rail 215. By setting the second slide rail 215 and using it in conjunction with the adjustment groove 213, precise positioning of the equipment can be achieved by using the hydraulic cylinder 216, which is horizontally fixed in the adjustment groove. This is because the hydraulic cylinder 216 provides driving force, while the second slide rail 215 provides the necessary movement path. When the hydraulic cylinder 216 operates, its output end transmits its internal driving force to the second slide rail 215, thereby achieving precise vertical movement or positioning of the equipment.

[0045] Reference Figure 3 , Figure 4 , Figure 5 , Figure 6 and Figure 7The clamping assembly 23 includes a sliding plate 231, a pressing hydraulic cylinder 232, and a support frame 233. The sliding plate 231 is horizontally slidably assembled in the second slide rail 215, and the sliding plate 231 is fixedly assembled with the output end of the adjusting hydraulic cylinder 216. The pressing hydraulic cylinder 232 is vertically fixed on the top surface of the sliding plate 231, and the top output end of the pressing hydraulic cylinder 232 is vertically fixed with the support frame 233. Inside the support frame 233, a support platform 234 is vertically fixed, and a deflection motor 235 is vertically fixed on the top surface of the support platform 234. The output end of the deflection motor 235 is horizontally fixed with a pressing bar 236, and both ends of the pressing bar 236 are fixed with pressure seats 237. By setting the technical features of the sliding plate 231, the pressing hydraulic cylinder 232, the support frame 233, the deflection motor 235, and the pressing bar 236, the design of these technical features enables the entire clamping assembly to accurately control the target object vertically and horizontally, thereby achieving efficient and accurate clamping and fixing. The slide plate 231 is located in the second slide rail 215 and is fixedly connected to the slide plate 231 via the output end of the adjusting hydraulic cylinder 216, allowing it to slide horizontally and thus precisely adjust the position of the clamping component. This sliding mechanism enables the clamping component to be flexibly adjusted as needed, improving the convenience and accuracy of operation. On the other hand, the pressing hydraulic cylinder 232 is vertically fixed to the slide plate 231, and its top output end is fixed with a support frame 233. By controlling the extension and retraction of the pressing hydraulic cylinder 232, the vertical position of the support frame 233 and its internal components can be precisely controlled. In this way, by adjusting the pressing hydraulic cylinder 232, appropriate downward pressure can be applied to the target object, ensuring that the target object is clamped and fixed in the required position. Furthermore, a deflection motor 235 is fixed on the support platform inside the support frame 233. The output end of the deflection motor 235 is connected to the lower pressure bar 236, and pressure seats 237 are fixed at both ends of the lower pressure bar 236. Thus, by controlling the rotation direction of the deflection motor 235, the position and angle of the pressure seats 237 can be adjusted in the horizontal direction, achieving flexible clamping of target objects of different shapes and sizes. Both sides of the support frame 233 are horizontally fixed with pressure hydraulic cylinders 238, and the external output end of the pressure hydraulic cylinders 238 is fixed with a pressing plate 239. A guide post 2391 is horizontally fixed in the middle of the outer end face of the pressing plate 239. By setting up the pressure hydraulic cylinders 238 and the pressing plate 239, the pressure hydraulic cylinders 238 can provide precise thrust control, thus playing a role in precisely applying pressure. Specifically, when the pressure hydraulic cylinder 238 receives a control signal, it drives the pressing plate 239 to perform a pressing movement in the horizontal direction.A push-pull slip ring 2392 is horizontally slidably sleeved on the guide post 2391, and a push-pull hydraulic cylinder 2395 is horizontally fixed at the end of the guide post 2391 away from the extrusion plate 239. The output end of the push-pull hydraulic cylinder 2395 is fixed on the push-pull slip ring 2392. Both the upper and lower ends of the guide post 2391 near the extrusion plate 239 are hinged with deflection arms 2393, and both the upper and lower ends of the guide post 2391 are horizontally arranged with pressure plates 2394. Both the upper and lower ends of the push-pull slip ring 2392 are hinged with deflection arms 2393, and the two sides of the pressure plates 2394 are respectively hinged to adjacent deflection arms 2393. By setting the guide post 2391 and the push-pull slip ring 2392, and horizontally slidably sleeved on the guide post 2391, the push-pull slip ring 2392 can move horizontally on the guide post 2391. Since a push-pull hydraulic cylinder 2395 is horizontally fixed at the end of the guide post 2391 furthest from the extrusion plate 239, and the output end of the push-pull hydraulic cylinder 2395 is fixed on the push-pull slip ring 2392, the reciprocating motion of the push-pull hydraulic cylinder 2395 can be directly transmitted to the push-pull slip ring 2392, thereby driving the push-pull slip ring 2392 to move horizontally on the guide post 2391. Simultaneously, deflection arms 2393 are hinged to both the upper and lower ends of the guide post 2391 near the extrusion plate 239, and pressure plates 2394 are horizontally arranged at both the upper and lower ends of the guide post 2391, allowing the two sides of the pressure plates 2394 to be hinged to the adjacent deflection arms 2393 respectively. By also hinged the upper and lower ends of the push-pull slip ring 2392 to the deflection arms 2393, this design allows the horizontal reciprocating motion of the push-pull slip ring 2392 to be transmitted to the extrusion plate 239 through the deflection arms 2393 and the pressure plates 2394. Therefore, when the push-pull hydraulic cylinder 2395 is working, the guide post 2391 drives the push-pull slip ring 2392 and the extrusion plate 239 to move up and down together, so as to realize the extrusion or release action.

[0046] The implementation principle of a flexible fixture for an automotive subframe machining center according to an embodiment of this application is as follows:

[0047] First, the clamping component 2 is docked with the machining center body. The clamping component 2 is detachably assembled on the three-dimensional tooling platform of the machining center body 1 via vertically fixed assembly slide bars 211 on the left and right sides of the bottom surface of the base plate 21. The assembly slide bars 211 ensure precise and convenient assembly, eliminating the need for overall fixture recalibration, significantly reducing downtime for fixture installation and changeover, and enabling rapid disassembly and replacement of the clamping component 2 to adapt to the machining requirements of different subframe specifications. Second, the base plate structure is pre-processed. The base plate 21 serves as the mounting base for the support assembly 22 and the clamping assembly 23. Symmetrical first slide rails 212 on its top front, rear, left, and right sides provide guidance for adjusting the horizontal position of the support assembly 22. Adjustment grooves 213 penetrating the middle of the top front, rear, left, and right sides and the middle of the top surface of the base plate 21 provide installation space for the locking hydraulic cylinder 217 and the adjusting hydraulic cylinder 216, ensuring a reasonable layout of the adjustment and locking structures and preventing interference with workpiece clamping and machining operations.

[0048] Secondly, in the first step, the horizontal position of the support components is coarsely adjusted. The screw hole slider 221 of the support component 22 is horizontally slidably assembled in the first slide rail 212 and threadedly connected to the adjusting screw 214 that is rotatably connected through the first slide rail 212. By rotating the adjusting screw 214, the screw hole slider 221 is driven to slide horizontally along the first slide rail 212, thereby adjusting the front-to-back and left-to-right positions of each support component 22 on the base plate 21, accurately adapting to the support point distribution of different models of subframes, replacing the traditional method of manually adjusting the positioning pins, and improving the adjustment accuracy and efficiency. The second step involves locking the support assembly position. After adjustment, the double-headed locking hydraulic cylinder 217, horizontally fixed inside the adjustment groove 213 of the base plate 21, is activated. Its two output ends synchronously drive the locking pin 218 to extend horizontally and insert into the locking slot 219 near the end of the adjusting screw 214, thereby limiting and locking the adjusting screw 214. This prevents the adjusting screw 214 from rotating due to cutting force or vibration during processing, which could cause the support assembly 22 to shift position and ensure the stability of positioning accuracy. The third step involves adjusting the height of the support assembly. The lifting hydraulic cylinder 222, vertically fixed on the top surface of the screw hole slider 221, is rotatably connected to the rotating shaft 225 at the bottom of the slide frame 224 via a swivel 223. Activating the lifting hydraulic cylinder 222 drives the slide frame 224 and the top pin 228 to rise and fall vertically, precisely adjusting the support height to adapt to subframe workpieces of different thicknesses and different mounting reference surface heights, ensuring that the top pin 228 can accurately fit the support surface of the subframe. The fourth step is to adjust the angle of the support assembly. The angle adjustment motor 229, which is vertically fixed on one side of the swivel 223, has a driving gear 2291 fixed horizontally at its top that meshes with the driven gear 2251 on the outer wall of the rotating shaft 225. When the angle adjustment motor 229 is started, the driving gear 2291 is driven to rotate. Through the gear meshing, the rotating shaft 225 and the sliding frame 224 are driven to deflect horizontally around the swivel 223, thereby adjusting the support angle of the top column 228 so that it is completely in contact with the support surface of the subframe. This avoids workpiece deformation or positioning deviation caused by uneven force on the support point, and improves the support stability and rigidity. The fifth step is to adjust the horizontal extension of the support assembly. The output end of the extension hydraulic cylinder 226, which is fixed horizontally at one end of the slide frame 224, is fixedly connected to the extension slide block 227, which is horizontally slidably assembled inside the slide frame 224. The extension hydraulic cylinder 226 is activated to drive the extension slide block 227 to slide horizontally along the slide frame 224, thereby adjusting the horizontal extension length of the top column 228, which is vertically fixed on the top surface of the extension slide block 227, to accurately align with the support hole or support boss of the subframe, so as to achieve precise positioning of the subframe and adapt to the differences in the horizontal position of the support point of different models of subframes.

[0049] Then, in the first step, the horizontal spacing of the clamping components is adjusted. Within the second slide rail 215 symmetrically opened in the center of the top surface of the base plate 21, the slide plate 231 slides horizontally and is fixedly connected to the output end of the adjusting hydraulic cylinder 216 symmetrically and horizontally fixed inside the adjusting groove 213. Activating the adjusting hydraulic cylinder 216 drives the slide plate 231 to slide horizontally along the second slide rail 215, thereby adjusting the spacing between the two clamping components 23 to precisely adapt to the internal width of different subframe models, achieving precise docking between the clamping components 23 and the subframe interior. In the second step, the height of the clamping components is adjusted. The top output end of the downward-pressing hydraulic cylinder 232, vertically fixed on the top surface of the slide plate 231, is fixedly connected to the support frame 233. Activating the downward-pressing hydraulic cylinder 232 drives the support frame 233 and subsequent clamping structures to rise and fall vertically, adjusting the clamping height to adapt to the internal height of different subframe models, ensuring that the clamping structure can accurately act on the clamping points inside the subframe. The third step is upper clamping adjustment. On the vertically fixed support platform 234 inside the support frame 233, the output end of the vertically fixed deflection motor 235 is horizontally fixed to the lower pressure bar 236. Starting the deflection motor 235 drives the lower pressure bar 236 to deflect horizontally, causing the pressure seats 237 fixed at both ends of the lower pressure bar 236 to fit against the upper inner wall of the subframe, achieving clamping and positioning of the upper part of the subframe and preventing displacement of the upper part of the subframe during processing. The fourth step is preliminary lateral clamping. The external output ends of the horizontally fixed pressure hydraulic cylinders 238 on both sides of the support frame 233 are fixedly connected to the extrusion plate 239. Starting the pressure hydraulic cylinders 238 drives the extrusion plate 239 to move horizontally into the subframe, achieving preliminary lateral clamping inside the subframe and providing a foundation for subsequent adaptive internal support. Step 5: Adaptive internal support clamping. A push-pull slip ring 2392 is horizontally slidably sleeved on a guide post 2391 horizontally fixed at the center of the outer end face of the extrusion plate 239. A push-pull hydraulic cylinder 2395 is horizontally fixed at the end of the guide post 2391 away from the extrusion plate 239, and its output end is fixedly connected to the push-pull slip ring 2392. Deflection arms 2393 are hinged to the upper and lower ends of the guide post 2391 near the extrusion plate 239 and the upper and lower ends of the push-pull slip ring 2392. The two sides of the pressure plate 2394 are respectively hinged to the adjacent deflection arms 2393. The push-pull hydraulic cylinder 2395 is activated, driving the push-pull slip ring 2392 to slide horizontally along the guide post 2391. Through the linkage of the deflection arms 2393, the upper and lower pressure plates 2394 are driven to deflect and unfold outward, forming an internal support clamping force, which tightens and fixes the subframe from the inside. This adaptive internal support structure can be flexibly adjusted according to the shape and size of the internal cavity of the subframe, ensuring uniform distribution of clamping force, avoiding workpiece deformation caused by local stress concentration, and significantly improving clamping rigidity to effectively resist cutting forces and vibrations during processing and ensure processing accuracy.

[0050] Subsequently, during the processing, the locking hydraulic cylinder 217 remains locked to ensure the position of the support assembly 22 is fixed; the lifting hydraulic cylinder 222, the angle adjusting motor 229, and the extension hydraulic cylinder 226 remain in the adjusted state to stably support the subframe with the top column 228; the pressing hydraulic cylinder 238 and the pushing-pull hydraulic cylinder 2395 remain in the clamping state to stably support the subframe with the clamping assembly 23, preventing workpiece displacement and deformation during processing; the cooperation of each slide, slider, and rotating shaft ensures smooth movement of each component and improves the overall operational reliability. When it is necessary to switch to processing different models of subframes, there is no need to disassemble and replace the entire set of fixtures. Simply release the locking hydraulic cylinder 217 and the clamping component 23 in sequence. By adjusting the screw 214, lifting hydraulic cylinder 222, angle adjusting motor 229, extension hydraulic cylinder 226, and adjusting hydraulic cylinder 216, the position, height, and angle of the support component 22 and the clamping component 23 can be quickly adjusted. This allows for the adaptation of different models of subframes, greatly shortens the downtime for model changeover, improves production efficiency, and solves the pain points of cumbersome and inefficient model changeover using traditional special fixtures.

[0051] Finally, in the first step, release the clamps. First, close the push-pull hydraulic cylinder 2395, drive the push-pull slip ring 2392 to slide in the opposite direction, and drive the pressure plate 2394 to retract through the deflection arm 2393, releasing the inner support clamps. Then, close the pressure hydraulic cylinder 238, drive the extrusion plate 239 to move in the opposite direction, releasing the lateral clamps. Then, start the deflection motor 235, drive the lower pressure bar 236 to deflect and reset, close the lower pressure hydraulic cylinder 232, and drive the support frame 233 to descend and reset. Finally, start the adjustment hydraulic cylinder 216, drive the two clamping components 23 to slide in the opposite direction, and reset to the initial position. In the second step, release the supports and locks. Close the lifting hydraulic cylinder 222, drive the slide frame bar 224 and the top column 228 to descend and reset; close the angle adjustment motor 229, drive the slide frame bar 224 to deflect and reset; start the locking hydraulic cylinder 217, drive the locking pin 218 to retract, and release the lock on the adjusting screw 214. The third step is to remove and place the workpiece and reset the fixture. The finished subframe is removed from the top column 228 and placed into the subsequent inspection and assembly process. If it is necessary to continue processing the next workpiece, the above process can be repeated.

[0052] 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 flexible fixture for an automotive subframe machining center, characterized in that, The machining center includes a machining center body (1) and a clamping component (2). The clamping component (2) is detachably assembled on the three-dimensional tooling platform of the machining center body (1). The clamping component (2) is used to clamp the automotive subframe workpiece to be processed. The clamping component (2) includes a base plate (21), a support component (22), and a clamping component (23). The base plate (21) is fixedly and detachably assembled on the three-dimensional tooling platform of the machining center body (1). The support component (22) is symmetrically installed on the front, back, left and right sides of the top surface of the base plate (21). The support component (22) is used to support the automotive subframe workpiece to be processed. Two clamping components (23) are symmetrically arranged on the left and right sides of the middle of the top surface of the base plate (21). The clamping component (23) is used to squeeze the interior of the automotive subframe workpiece to be processed.

2. The flexible fixture for an automotive subframe machining center according to claim 1, characterized in that: The bottom surface of the base plate (21) is vertically fixed with assembly slides (211) on both the left and right sides. The assembly slides (211) are used to assemble on the three-dimensional tooling platform of the machining center body (1). The top front, back and left and right sides of the base plate (21) are symmetrically provided with first slides (212). The middle of the top front, back and left and right sides of the base plate (21) is provided with adjustment grooves (213). Adjustment screws (214) are rotatably connected through the first slides (212) on the top front, back and left and right sides of the base plate (21).

3. The flexible fixture for an automotive subframe machining center according to claim 2, characterized in that: The support assembly (22) includes a screw hole slider (221), a sliding frame (224), and a top post (228). The screw hole slider (221) is horizontally slidably assembled in the first slide rail (212), and a lifting hydraulic cylinder (222) is vertically fixed on the top surface of the screw hole slider (221). The screw hole slider (221) is threadedly assembled with the adjusting screw (214). The sliding frame (224) is provided above the lifting hydraulic cylinder (222), and an extension slide (227) is horizontally slidably assembled in the sliding frame (224). The top post (228) is vertically fixed on the top surface of the extension slide (227), and the top post (228) is used to support the automotive subframe workpiece to be processed.

4. The flexible fixture for an automotive subframe machining center according to claim 3, characterized in that: A rotating shaft (225) is vertically fixed on the bottom surface of one end of the sliding frame (224), and a driven gear (2251) is horizontally fixed on the outer wall of the rotating shaft (225). An extension hydraulic cylinder (226) is horizontally fixed on one end of the sliding frame (224), and the output end of the extension hydraulic cylinder (226) is fixed on the extension slide (227).

5. The flexible fixture for an automotive subframe machining center according to claim 4, characterized in that: The top of the lifting hydraulic cylinder (222) is vertically fixed with a rotating seat (223), and the rotating seat (223) is rotatably connected to the rotating shaft (225) at the bottom of the sliding frame (224). An angle adjustment motor (229) is vertically fixed on one side of the rotating seat (223), and a drive gear (2291) is horizontally fixed on the top of the angle adjustment motor (229), and the drive gear (2291) meshes with the driven gear (2251).

6. The flexible fixture for an automotive subframe machining center according to claim 5, characterized in that: A double-headed locking hydraulic cylinder (217) is horizontally fixed inside the adjustment groove (213) of the base plate (21), and locking pins (218) are horizontally fixed at both output ends of the locking hydraulic cylinder (217). Locking slots (219) are horizontally fixed at the ends of the adjustment screw (214) near the locking hydraulic cylinder (217), and the locking slots (219) are limited and inserted into the locking pins (218) at the output ends of the locking hydraulic cylinder (217).

7. The flexible fixture for an automotive subframe machining center according to claim 1, characterized in that: The top surface of the base plate (21) is symmetrically provided with a second slide rail (215) and the top surface of the base plate (21) is provided with an adjustment groove (213). The adjustment groove (213) of the base plate (21) is symmetrically and horizontally fixed with an adjustment hydraulic cylinder (216), and the output end of the adjustment hydraulic cylinder (216) is inserted through the second slide rail (215).

8. The flexible fixture for an automotive subframe machining center according to claim 7, characterized in that: The clamping assembly (23) includes a sliding plate (231), a pressing hydraulic cylinder (232), and a support frame (233). The sliding plate (231) is horizontally slidably assembled in the second slide rail (215), and the sliding plate (231) is fixedly assembled with the output end of the adjusting hydraulic cylinder (216). The pressing hydraulic cylinder (232) is vertically fixed on the top surface of the sliding plate (231), and the support frame (233) is vertically fixed on the top output end of the pressing hydraulic cylinder (232). A support platform (234) is vertically fixed inside the support frame (233), and a deflection motor (235) is vertically fixed on the top surface of the support platform (234). A pressing bar (236) is horizontally fixed on the output end of the deflection motor (235), and a pressure seat (237) is fixed at both ends of the pressing bar (236).

9. A flexible fixture for an automotive subframe machining center according to claim 8, characterized in that: Both sides of the support frame (233) are horizontally fixed with hydraulic cylinders (238), and the external output end of the hydraulic cylinders (238) is fixed with a pressing plate (239). The middle of the outer end face of the pressing plate (239) is horizontally fixed with a guide post (2391).

10. A flexible fixture for an automotive subframe machining center according to claim 9, characterized in that: A push-pull slip ring (2392) is horizontally slidably sleeved on the guide post (2391), and a push-pull hydraulic cylinder (2395) is horizontally fixed at one end of the guide post (2391) away from the extrusion plate (239). The output end of the push-pull hydraulic cylinder (2395) is fixed on the push-pull slip ring (2392). Both the upper and lower ends of the guide post (2391) near the extrusion plate (239) are hinged with deflection arms (2393). Both the upper and lower ends of the guide post (2391) are horizontally provided with pressure plates (2394). Both the upper and lower ends of the push-pull slip ring (2392) are hinged with deflection arms (2393). The two sides of the pressure plate (2394) are respectively hinged to the adjacent deflection arms (2393).

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