A device for stretching a car skin

Abstract

The utility model belongs to the skin stretching technical field, concretely relates to a kind of automobile skin stretching device, including transverse stretching mechanism, two transverse stretching mechanisms, and longitudinal stretching mechanism is provided between two transverse stretching mechanisms;Transverse stretching mechanism includes mounting plate, and the upper slide of mounting plate is equipped with translation seat, and the one end of translation seat is equipped with several multi-angle clamping mechanisms;Multi-angle clamping mechanism includes electric telescopic handle, and electric telescopic handle is installed in the inside of translation seat, and the output of electric telescopic handle is fixed with ball sleeve, and the inside rotation of ball sleeve is connected with ball shaft.The utility model uses zoned combination jaw clamping, and different pressure is applied to each block area of clamping place according to thickness and inclination angle, and the plate material is kept uniform stress, and self-adapting ball shaft connection is simultaneously used, and jaw position can be self-adapting to produce rotation when longitudinal tension is applied, avoid the plate material of jaw position to appear bending phenomenon, effectively avoid the risk of fracture.

Description

Technical Field

[0001] This utility model belongs to the field of skin stretching technology, specifically relating to an automotive skin stretching device. Background Technology

[0002] Skin stretching is a sheet metal forming process widely used in rail vehicles, aircraft, buses and other fields. Its core principle is to apply pre-tension to induce controllable plastic deformation of the metal sheet (skin), thereby forming residual tensile stress inside to offset deformation during subsequent processing or use. The jaws used in existing skin stretching equipment are mostly integral. When the sheet metal is thick in some areas or tilted during placement, the integral jaws are prone to wrinkling and cracking due to uneven pressure. Furthermore, if longitudinal tension is required for plastic deformation during skin stretching, the clamping part will have a hard bending stress concentration point due to the longitudinal stretching of the sheet metal, which may lead to breakage at the bend. Utility Model Content

[0003] The purpose of this invention is to provide an automotive skin stretching device that uses a partitioned combination jaw clamping mechanism. Different pressures are applied to each area of ​​the clamping point according to its thickness and tilt angle to maintain uniform force on the sheet metal. At the same time, an adaptive ball joint connection is used, which allows the jaw part to rotate adaptively when longitudinal tension is applied, avoiding bending of the sheet metal at the jaw part and effectively avoiding the risk of breakage.

[0004] The specific technical solution adopted by this utility model is as follows:

[0005] A car skin stretching device includes two lateral stretching mechanisms, and a longitudinal stretching mechanism is provided between the two lateral stretching mechanisms.

[0006] The lateral stretching mechanism includes a mounting plate, and a translation seat is slidably mounted on the top of the mounting plate. A plurality of multi-angle clamping mechanisms are mounted on one end of the translation seat.

[0007] The multi-angle clamping mechanism includes an electric telescopic rod, which is installed inside the translation seat. A ball sleeve is fixed to the output end of the electric telescopic rod. A ball shaft is rotatably connected inside the ball sleeve. A jaw is fixed to one end of the ball shaft. A fourth hydraulic rod is fixed to the top of the jaw. A pressure plate is fixed to the output end of the fourth hydraulic rod, which is located inside the jaw.

[0008] Furthermore, a guide rail slider is fixed to the bottom of the translation seat, and the guide rail slider is slidably mounted above the mounting plate. A first connecting seat is fixed to the two end corners of the other end of the translation seat, and a second connecting seat is fixed to the two end corners of the other end of the mounting plate. A first hydraulic rod is installed between the first connecting seat and the second connecting seat.

[0009] Furthermore, the longitudinal stretching mechanism includes a mounting frame, a second hydraulic rod fixed to the bottom of the mounting frame, a first stretching mold fixed to the output end of the second hydraulic rod, a third hydraulic rod fixed to the top of the mounting frame, a second stretching mold fixed to the output end of the third hydraulic rod, support plates fixed to both ends of the bottom of the mounting frame, the top of the support plate fixed to one end of the bottom of the mounting plate, and reinforcing ribs provided at the connection between the support plate and the mounting plate.

[0010] Furthermore, the surfaces of the first stretching die and the second stretching die are provided with heat-spreading plates.

[0011] Furthermore, anti-slip pads are provided on the upper surface of the inner side of the jaws and the lower surface of the pressure plate.

[0012] The technical effects achieved by this utility model are as follows:

[0013] This utility model features a split design with multiple jaws, and the fourth hydraulic rod at each clamping point can be independently adjusted to precisely match the thickness difference and inclination of the workpiece edge, ensuring a uniform distribution of clamping force. This reduces local wrinkling and cracking caused by uneven stress on the skin during stretching.

[0014] This invention enables independent extension and retraction of each jaw via an electric telescopic rod, allowing the jaws to be positioned beyond a straight line. The connection between the electric telescopic rod and the jaws utilizes a ball joint and a ball shaft, enabling free rotation at multiple angles. This facilitates clamping workpieces with irregular contours. Furthermore, during longitudinal stretching, the jaws are allowed to deflect along the longitudinal stretching direction of the workpiece, adapting in real-time to changes in angle and position caused by workpiece deformation. This avoids the formation of stress concentration points at the clamping points, significantly reducing the risk of breakage of the stretched component under complex stress conditions. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of this utility model;

[0016] Figure 2 This is a schematic diagram of the longitudinal tensioning mechanism of this utility model;

[0017] Figure 3 This is a schematic diagram of the transverse tensioning mechanism of this utility model;

[0018] Figure 4 This is a partial cross-sectional schematic diagram of the multi-angle clamping mechanism of this utility model.

[0019] The attached diagram lists the components represented by each number as follows:

[0020] 1. Lateral stretching mechanism; 2. Longitudinal stretching mechanism; 3. Multi-angle clamping mechanism; 4. Support plate; 11. Mounting plate; 12. Translation seat; 13. Guide rail slider; 14. First connecting seat; 15. Second connecting seat; 16. First hydraulic rod; 21. Mounting bracket; 22. Second hydraulic rod; 23. First stretching die; 24. Third hydraulic rod; 25. Second stretching die; 31. Electric telescopic rod; 32. Ball sleeve; 33. Ball shaft; 34. Jaw; 35. Fourth hydraulic rod; 36. Pressure plate. Detailed Implementation

[0021] To make the objectives and advantages of this utility model clearer, the following detailed description is provided in conjunction with embodiments. It should be understood that the following text is merely used to describe one or more specific embodiments of this utility model and does not strictly limit the scope of protection specifically claimed by this utility model.

[0022] like Figures 1 to 4 As shown, an automotive skin stretching device includes a transverse stretching mechanism 1, which has two parts, and a longitudinal stretching mechanism 2 is provided between the two transverse stretching mechanisms 1.

[0023] The transverse stretching mechanism 1 includes a mounting plate 11, a translation seat 12 is slidably mounted on the top of the mounting plate 11, and a plurality of multi-angle clamping mechanisms 3 are mounted on one end of the translation seat 12.

[0024] The multi-angle clamping mechanism 3 includes an electric telescopic rod 31, which is installed inside the translation seat 12. A ball sleeve 32 is fixed to the output end of the electric telescopic rod 31. A ball shaft 33 is rotatably connected inside the ball sleeve 32. A jaw 34 is fixed to one end of the ball shaft 33. A fourth hydraulic rod 35 is fixed to the top of the jaw 34. A pressure plate 36 is fixed to the output end of the fourth hydraulic rod 35 and located inside the jaw 34.

[0025] As described above, during the skin stretching process, the automotive skin sheet is placed between two transverse stretching mechanisms 1, and the edge of the automotive skin sheet is positioned between several jaws 34 and pressure plates 36. The pressure plates 36 are lowered by the second stretching die 25, clamping the edge of the automotive skin sheet between the jaws 34 and the pressure plates 36. Because there are several jaws 34, the thrust of each fourth hydraulic rod 35 pushing the pressure plates 36 downward can be adjusted according to the thickness of the workpiece edge and the potential tilt during placement, maintaining uniform force on the edge of the automotive skin sheet and preventing wrinkling and cracking during the stretching process. Furthermore, when clamping the automotive skin sheet, the electric telescopic rod 31 can be used to... The jaws 34 are moved so that they are not in the same straight line position, which facilitates the clamping of irregular automotive skin panels. At the same time, since the connection point between the output end of the electric telescopic rod 31 and the jaws 34 is connected by a ball sleeve 32 and a ball shaft 33, the jaws 34 can also deflect at multiple angles. Combined with the independent telescopic control of the jaws 34, it is easier to clamp and fix irregular automotive skin panels. When longitudinal tension is applied to the automotive skin panel, the ball sleeve 32 and the ball shaft 33 can rotate, causing the angle of the jaws 34 to deflect, thereby adapting to the longitudinal displacement of the automotive skin panel during longitudinal tension, thus preventing bending and breakage.

[0026] Furthermore, anti-slip pads are provided on the upper surface of the inner side of the jaws 34 and the lower surface of the pressure plate 36 to increase friction and make the plate clamping more secure.

[0027] Please refer to it again. Figure 3 As shown, a guide rail slider 13 is fixed to the bottom of the translation seat 12. The guide rail slider 13 is slidably mounted above the mounting plate 11. A first connecting seat 14 is fixed to the two end corners of the other end of the translation seat 12. A second connecting seat 15 is fixed to the two end corners of the other end of the mounting plate 11. A first hydraulic rod 16 is installed between the first connecting seat 14 and the second connecting seat 15.

[0028] As described above, the first hydraulic rod 16 can control the sliding seat 12 to slide on the mounting plate 11, and the guide rail slider 13 can raise the height of the sliding seat 12, which can prevent the plate from extending and spraying out to the edge of the mounting plate 11 when stretched vertically downward.

[0029] Please refer to it again. Figure 2 As shown, the longitudinal stretching mechanism 2 includes a mounting frame 21. A second hydraulic rod 22 is fixed to the bottom of the mounting frame 21. A first stretching die 23 is fixed to the output end of the second hydraulic rod 22. A third hydraulic rod 24 is fixed to the top of the mounting frame 21. A second stretching die 25 is fixed to the output end of the third hydraulic rod 24. Support plates 4 are fixed to both ends of the bottom of the mounting frame 21. The top of the support plate 4 is fixed to one end of the bottom of the mounting plate 11. Reinforcing ribs are provided at the connection between the support plate 4 and the mounting plate 11.

[0030] In the above process, during the transverse stretching of the sheet metal by the transverse stretching mechanism 1, the first stretching mold 23 or the second stretching mold 25 can be raised or lowered by the second hydraulic rod 22 or the third hydraulic rod 24 set between the two transverse stretching mechanisms 1, so as to apply longitudinal tension to the sheet metal and stretch it into the shape of the surface of the first stretching mold 23 or the second stretching mold 25. If the curved surface of the skin stretching is more complex, the first stretching mold 23 and the second stretching mold 25 can be replaced with matching molds. By simultaneously controlling the first stretching mold 23 and the second stretching mold 25 to merge, the sheet metal is stretched and plasticized.

[0031] Furthermore, the surfaces of the first stretching die 23 and the second stretching die 25 are provided with heat-spreading plates. By providing heat-spreading plates on the first stretching die 23 and the second stretching die 25, the temperature of the sheet material can be maintained during hot stretching, ensuring that the stretching effect is not affected by the drop in sheet material temperature during the stretching process.

[0032] The working principle of this utility model is as follows: The automotive skin sheet is placed between two transverse stretching mechanisms 1, and the edge of the sheet is positioned in the gap between the jaws 34 and the pressure plate 36 of each multi-angle clamping mechanism 3. The fourth hydraulic rod 35 is activated to drive the pressure plate 36 downwards, clamping the edge of the sheet onto the jaws 34. The pressure applied at each clamping point can be individually fine-tuned according to the local edge conditions to ensure uniform force distribution across the entire sheet edge. When the sheet contour is irregular, the corresponding electric telescopic rod 31 can be controlled to extend and retract the corresponding jaws 34 to adjust their position. Simultaneously, rotation is allowed at the ball sleeve 32 and ball shaft 33 to ensure a precise fit, facilitating the clamping and fixing of irregularly shaped workpieces. During transverse stretching... During the stretching process, the first hydraulic rod 16 on the two transverse stretching mechanisms 1 is activated to move the translation seat 12 outward, applying a transverse tension to the skin sheet clamped in the middle. If a longitudinal tension needs to be applied simultaneously during this process, the second hydraulic rod 22 or the third hydraulic rod 24 can be activated to raise or lower the first stretching die 23 or the second stretching die 25 to contact the skin sheet and apply a longitudinal tension. During the longitudinal stretching process, the sheet bends in the stretching direction. At the same time, the jaws 34 deflect with the longitudinal stretching direction of the workpiece, adapting in real time to the angle and position changes caused by the deformation of the workpiece, avoiding the generation of hard bending stress concentration points at the clamping point, and greatly reducing the risk of breakage of the stretched part under complex stress conditions.

[0033] The above description is merely a preferred embodiment of this utility model. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principle of this utility model, and these improvements and modifications should also be considered within the scope of protection of this utility model. Structures, devices, and operating methods not specifically described or explained in this utility model, unless otherwise specified or limited, shall be implemented using conventional methods in the field.

Claims

1. A car skin stretching device, characterized in that: It includes a transverse tensioning mechanism (1), there are two transverse tensioning mechanisms (1), and a longitudinal tensioning mechanism (2) is provided between the two transverse tensioning mechanisms (1). The transverse stretching mechanism (1) includes a mounting plate (11), a translation seat (12) is slidably mounted on the top of the mounting plate (11), and a plurality of multi-angle clamping mechanisms (3) are mounted on one end of the translation seat (12). The multi-angle clamping mechanism (3) includes an electric telescopic rod (31), which is installed inside the translation seat (12). A ball sleeve (32) is fixed at the output end of the electric telescopic rod (31). A ball shaft (33) is rotatably connected inside the ball sleeve (32). A jaw (34) is fixed at one end of the ball shaft (33). A fourth hydraulic rod (35) is fixed at the top of the jaw (34). A pressure plate (36) is fixed at the output end of the fourth hydraulic rod (35) and located inside the jaw (34).

2. The automotive skin stretching device according to claim 1, characterized in that: The bottom of the translation seat (12) is fixed with a guide rail slider (13), which is slidably mounted above the mounting plate (11). The two end corners of the other end of the translation seat (12) are fixed with a first connecting seat (14), and the two end corners of the other end of the mounting plate (11) are fixed with a second connecting seat (15). A first hydraulic rod (16) is installed between the first connecting seat (14) and the second connecting seat (15).

3. The automotive skin stretching device according to claim 1, characterized in that: The longitudinal stretching mechanism (2) includes a mounting frame (21), a second hydraulic rod (22) is fixed at the bottom of the mounting frame (21), a first stretching mold (23) is fixed at the output end of the second hydraulic rod (22), a third hydraulic rod (24) is fixed at the top of the mounting frame (21), a second stretching mold (25) is fixed at the output end of the third hydraulic rod (24), and support plates (4) are fixed at both ends of the bottom of the mounting frame (21). The top of the support plate (4) is fixed to one end of the bottom of the mounting plate (11), and a reinforcing rib is provided at the connection between the support plate (4) and the mounting plate (11).

4. The automotive skin stretching device according to claim 3, characterized in that: The surfaces of the first stretching die (23) and the second stretching die (25) are provided with heat-spreading plates.

5. The automotive skin stretching device according to claim 1, characterized in that: Anti-slip pads are provided on the upper surface of the inner side of the jaws (34) and the lower surface of the pressure plate (36).

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