Automobile body stamping die with buffer protection

Abstract

This utility model relates to the field of automotive body stamping die technology, and discloses an automotive body stamping die with buffer protection. It includes an outer shell, a fixed rod fixedly connected to the top of the outer shell, a top plate fixedly connected to the top of the fixed rod, a lower die base fixedly connected to the top of the outer shell, a pressure plate slidably connected to the outer wall of the fixed rod, an upper die base fixedly connected to the bottom of the pressure plate, and a buffer assembly provided on the top of the outer shell. The buffer assembly includes a first buffer pad, a second buffer pad, and a first spring sleeved on the outer wall of the fixed rod. In this utility model, the pressure plate is driven to slide along the outer wall of the fixed rod by the output end of a hydraulic cylinder, compressing the first spring. Simultaneously, the first buffer pad and the connecting rod extend into the second buffer pad. During stamping, the impact force is absorbed by the spring compression and the deformation of the buffer pad, solving the problem of severe die wear and easy workpiece deformation caused by rigid collisions during traditional die stamping, thus improving the durability of the die and the stability of workpiece forming.

Description

Technical Field

[0001] This utility model relates to the field of automotive body stamping die technology, and in particular to automotive body stamping die with buffer protection. Background Technology

[0002] As a crucial component of the vehicle body structure, the forming quality of the car body directly impacts the safety and aesthetics of the entire vehicle. Stamping is a key process in car body manufacturing. However, traditional stamping dies are prone to rigid collisions during high-speed stamping, leading to concentrated impact forces between the die and the sheet metal. This not only accelerates die wear but also causes localized deformation or cracking of the workpiece due to excessive instantaneous stress. With the advancement of automotive lightweighting trends, the widespread use of high-strength steel sheets and aluminum alloys has further amplified this problem. Therefore, developing a car body stamping die with buffer protection functions has become an important research direction for improving the stability of the stamping process and the life of the die. Such a die needs to absorb impact energy through a flexible buffer mechanism while ensuring forming accuracy, thereby balancing production efficiency and equipment durability.

[0003] Most existing automotive body stamping dies adopt a rigid guiding structure, mainly composed of an upper die base, a lower die base, and guide pillars and bushings. During the stamping process, the hydraulic press drives the upper die to press vertically down along the guide pillars, and the sheet metal is formed by the cooperation of the punch and die. In order to control the return stroke accuracy, some dies will be equipped with limit blocks or mechanical locking devices on the guide pillars. The demolding process relies on manual prying or simple ejection mechanisms, such as spring ejector rods fixed at the bottom of the die base. Such structures rely on the direct contact of metal parts to transmit force. Although they can ensure the basic forming requirements, the buffer design is generally insufficient, especially under high-speed continuous stamping conditions, the dynamic stability of the die is poor.

[0004] The main problem with existing technology is that rigid collisions during the stamping process cannot be effectively mitigated. When the upper die contacts the sheet metal, the impact force is directly transmitted to the workpiece and die base through the rigid structure of the die. Long-term operation can easily lead to wear problems such as increased clearance between the guide post and the guide sleeve, and chipping of the punch cutting edge. At the same time, the instantaneous impact can cause unexpected plastic deformation of the sheet metal, affecting the dimensional accuracy of the workpiece. Especially for materials with thinner thickness or poor ductility, the yield rate is significantly reduced. This defect forces companies to frequently stop to repair the die and increase scrap disposal costs, which seriously restricts the efficiency and economy of mass production of automobile bodies. To solve the above problems, a stamping die for automobile bodies with buffer protection is proposed. Utility Model Content

[0005] The purpose of this invention is to provide a car body stamping die with buffer protection, which aims to improve the technical problems of severe die wear and easy workpiece deformation caused by rigid collision during traditional die stamping.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a car body stamping die with buffer protection, including a shell, a fixing rod fixedly connected to the top of the shell, a top plate fixedly connected to the top of the fixing rod, a lower die base fixedly connected to the top of the shell, a pressure plate slidably connected to the outer wall of the fixing rod, an upper die base fixedly connected to the bottom of the pressure plate, and a buffer assembly provided on the top of the shell;

[0007] The buffer assembly includes a first buffer pad, a second buffer pad, and a first spring sleeved on the outer wall of the fixed rod. The top of the first buffer pad is fixedly connected to the bottom of the pressure plate, the bottom of the second buffer pad is fixedly connected to the top of the outer shell, and a connecting rod is fixedly connected to the bottom of the first buffer pad. The outer wall of the connecting rod is slidably connected to the inside of the second buffer pad. A hydraulic cylinder is fixedly connected to the bottom of the top plate, and the output end of the hydraulic cylinder is fixedly connected to the top of the pressure plate. A demolding assembly is provided inside the outer shell.

[0008] As a further description of the above technical solution:

[0009] One end of the spring is fixedly connected to the bottom of the pressure plate, and the other end of the spring is fixedly connected to the top of the outer casing.

[0010] As a further description of the above technical solution:

[0011] The demolding assembly includes an ejector pin and a movable plate. The bottom of the ejector pin is fixedly connected to the top of the movable plate, and the outer wall of the ejector pin is slidably connected to the inside of the housing. The outer wall of the ejector pin is also slidably connected to the inside of the lower mold base.

[0012] As a further description of the above technical solution:

[0013] A movable rod is fixedly connected to the bottom of the movable plate, and a fixed plate is slidably connected to the outer wall of the movable rod. The outer wall of the fixed plate is fixedly connected to the inside of the outer shell.

[0014] As a further description of the above technical solution:

[0015] A fixing block is fixedly connected to the bottom of the fixing plate, the outer wall of the moving rod is slidably connected to the inside of the fixing block, and a fixing ring is fixedly connected to the bottom of the moving rod.

[0016] As a further description of the above technical solution:

[0017] The outer wall of the movable rod is fitted with a second spring. One end of the second spring is fixedly connected to the bottom of the fixed block, and the other end of the second spring is fixedly connected to the top of the fixed ring.

[0018] As a further description of the above technical solution:

[0019] The bottom of the movable plate is fixedly connected to a roller, and the top of the fixed plate is fixedly connected to a slide rail. A trapezoidal block is slidably connected inside the slide rail, and the top of the trapezoidal block is in contact with the bottom of the roller.

[0020] As a further description of the above technical solution:

[0021] A push rod is fixedly connected to the top of the fixed plate, and the output end of the push rod is fixedly connected to the outer wall of the trapezoidal block.

[0022] This utility model has the following beneficial effects:

[0023] 1. In this utility model, the pressure plate is driven to slide along the outer wall of the fixed rod by the output end of the hydraulic cylinder, which squeezes the first spring and at the same time drives the first buffer pad and the connecting rod to extend into the second buffer pad. During stamping, the impact force is absorbed by the spring compression and the deformation of the buffer pad, which solves the problem of severe mold wear and easy workpiece deformation caused by rigid collision during traditional mold stamping, and improves the durability of the mold and the stability of workpiece forming.

[0024] 2. In this utility model, the trapezoidal block is pushed to slide along the slide rail by the output end of the push rod. The trapezoidal block drives the moving plate and moving rod to move upward by the extrusion roller. At this time, the fixed block and the fixed ring compress the spring, so that the moving plate drives the push rod to quickly push out the object in the lower mold base, thereby achieving the effect of rapid demolding. This solves the problems of low efficiency and high labor intensity of traditional manual demolding and improves the unloading efficiency of the mold. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a three-dimensional schematic diagram of the automobile body stamping die with buffer protection proposed in this utility model;

[0027] Figure 2 This is a schematic diagram of the pressure plate structure of the automobile body stamping die with buffer protection proposed in this utility model;

[0028] Figure 3 This is a schematic diagram of the outer shell structure of the automobile body stamping die with buffer protection proposed in this utility model;

[0029] Figure 4 This is a schematic diagram of the fixing plate structure of the automobile body stamping die with buffer protection proposed in this utility model;

[0030] Figure 5 This is a schematic diagram of the trapezoidal block structure of the automobile body stamping die with buffer protection proposed in this utility model.

[0031] The following are the labeling elements in the figure:

[0032] 1. Outer shell; 2. Fixing rod; 3. Top plate; 4. Hydraulic cylinder; 5. Pressure plate; 6. Upper mold base; 7. Lower mold base; 8. Buffer pad one; 9. Connecting rod; 10. Buffer pad two; 11. Spring one; 12. Fixing plate; 13. Moving rod; 14. Moving plate; 15. Push rod; 16. Fixing ring; 17. Fixing block; 18. Spring two; 19. Roller; 20. Slide rail; 21. Push rod; 22. Trapezoidal block. Detailed Implementation

[0033] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the embodiments of the present invention, and should not be construed as limiting the present invention.

[0034] In the description of the embodiments of this utility model, it should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the embodiments of this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of embodiments of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0036] In this embodiment of the invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this embodiment of the invention according to the specific circumstances.

[0037] Reference Figures 1-2 This utility model provides an embodiment of a car body stamping die with buffer protection, including an outer shell 1. The outer shell 1 is used to support and fix the overall die structure, while protecting the internal components from external interference. A fixing rod 2 is fixedly connected to the top of the outer shell 1. The fixing rod 2 is used to provide guidance and support to ensure that the pressure plate 5 moves stably in the vertical direction. A top plate 3 is fixedly connected to the top of the fixing rod 2. The top plate 3 is used to install the hydraulic cylinder 4 and enhance the structural rigidity. A lower die base 7 is fixedly connected to the top of the outer shell 1. The lower die base 7 is used to fix the lower die and provide a basic support surface for workpiece forming. A pressure plate 5 is slidably connected to the outer wall of the fixing rod 2. The pressure plate 5 is used to transmit the power of the hydraulic cylinder 4 and drive the upper die base 6 to move. The upper die base 6 is fixedly connected to the bottom of the pressure plate 5. The upper die base 6 is used to install the upper die and cooperate with the lower die base 7 to complete the stamping forming. A buffer assembly is provided on the top of the outer shell 1. The buffer assembly is used to absorb the impact force during the stamping process and reduce die wear and workpiece deformation.

[0038] The buffer assembly includes a first buffer pad 8, a second buffer pad 10, and a first spring 11 fitted onto the outer wall of the fixed rod 2. The first buffer pad 8 and the second buffer pad 10 absorb instantaneous impacts through elastic deformation, while the first spring 11 stores energy through compression to mitigate rigid collisions. The top of the first buffer pad 8 is fixedly connected to the bottom of the pressure plate 5. The first buffer pad 8 is used to contact the second buffer pad 10 and buffer the impact when the pressure plate 5 is pressed down. The bottom of the second buffer pad 10 is fixedly connected to the top of the outer shell 1. The second buffer pad 10 provides the contact surface for the first buffer pad 8 and works together to absorb impact energy. A connecting rod 9 is fixedly connected to the bottom of the first buffer pad 8. The connecting rod 9 is used to guide the movement trajectory of the first buffer pad 8 and ensure the stability of the buffering process. The wall is slidably connected inside the buffer pad 2 10. The sliding cooperation between the connecting rod 9 and the buffer pad 2 10 further optimizes the buffering effect. The bottom of the top plate 3 is fixedly connected to the hydraulic cylinder 4. The hydraulic cylinder 4 is used to provide stamping power and control the movement stroke of the pressure plate 5. The output end of the hydraulic cylinder 4 is fixedly connected to the top of the pressure plate 5. The hydraulic cylinder 4 drives the upper die seat 6 through the pressure plate 5 to complete the stamping action. The shell 1 is provided with a demolding assembly. The demolding assembly is used to push the workpiece out from the lower die seat 7 after stamping. One end of the spring 11 is fixedly connected to the bottom of the pressure plate 5, and the other end of the spring 11 is fixedly connected to the top of the shell 1. The spring 11 is compressed when the pressure plate 5 moves down, stores energy, and assists in resetting during the return stroke.

[0039] Reference Figures 3-5The demolding assembly includes an ejector pin 15 and a movable plate 14. The ejector pin 15 is used to push the workpiece upward during demolding, and the movable plate 14 is used to drive the ejector pin 15 to move. The bottom of the ejector pin 15 is fixedly connected to the top of the movable plate 14, so that the movement of the movable plate 14 is directly transmitted to the ejector pin 15. The outer wall of the ejector pin 15 is slidably connected to the inside of the outer shell 1 to ensure that the ejector pin 15 moves stably in the vertical direction. The outer wall of the ejector pin 15 is slidably connected to the inside of the lower mold base 7, so that the ejector pin 15 can accurately act on the bottom of the workpiece to complete demolding. The bottom of the movable plate 14 is fixedly connected to... A movable rod 13 is connected to the mold. The movable rod 13 is used to transmit the thrust of the trapezoidal block 22 and drive the movable plate 14 to move. A fixed plate 12 is slidably connected to the outer wall of the movable rod 13. The fixed plate 12 provides guide support for the movable rod 13. The outer wall of the fixed plate 12 is fixedly connected to the inside of the outer shell 1, so that the demolding assembly is stably connected to the mold body. A fixed block 17 is fixedly connected to the bottom of the fixed plate 12. The fixed block 17 is used to limit the range of motion of the movable rod 13. The outer wall of the movable rod 13 is slidably connected to the inside of the fixed block 17 to ensure that the movable rod 13 moves in a straight line. The moving rod 13 is fixedly connected to a fixed ring 16 at its bottom. The fixed ring 16 is used to compress the second spring 18 and assist in resetting. The second spring 18 is sleeved on the outer wall of the moving rod 13. The second spring 18 is used to automatically reset the moving rod 13 after demolding. One end of the second spring 18 is fixedly connected to the bottom of the fixed block 17, and the other end is fixedly connected to the top of the fixed ring 16, forming an elastic resetting mechanism. The bottom of the moving plate 14 is fixedly connected to a roller 19. The roller 19 is used to reduce the frictional resistance with the trapezoidal block 22. The top of the fixed plate 12 is fixedly connected to... A slide rail 20 is connected to the trapezoidal block 22, which provides precise sliding guidance. The trapezoidal block 22 is slidably connected inside the slide rail 20. The trapezoidal block 22 converts the horizontal thrust into the vertical output force through the inclined structure. The top of the trapezoidal block 22 contacts the bottom of the roller 19 to achieve effective force transmission. A push rod 21 is fixedly connected to the top of the fixed plate 12. The push rod 21 acts as a power source to drive the movement of the trapezoidal block 22. The output end of the push rod 21 is fixedly connected to the outer wall of the trapezoidal block 22, directly transmitting the linear motion of the push rod 21 to the trapezoidal block 22.

[0040] Working principle: During the stamping of the automotive mold, the hydraulic cylinder 4 is activated, and its output end pushes the pressure plate 5 to slide downward along the fixed rod 2, causing the upper mold base 6 to move downward synchronously. During the stamping process, the upper mold base 6 first contacts the sheet metal, and then, as it continues to press down, the buffer pad 1 8 contacts the buffer pad 2 10. At this time, the connecting rod 9 begins to insert into the buffer pad 2 10, and the spring 1 11 is gradually compressed. At this time, the impact energy is first deformed through the elastic materials of the buffer pad 1 8 and the buffer pad 2 10, converting part of the impact energy into elastic potential energy. Subsequently, the compression process of the spring 1 11 prolongs the impact time and reduces the instantaneous peak load. Finally, the sliding friction of the connecting rod 9 in the buffer pad 2 10 further dissipates the energy. When the forming is completed, the hydraulic cylinder 4 retracts, and the spring 1 1 1... The elastic potential energy stored in the first 11 is released, and the auxiliary pressure plate 5 quickly resets. When demolding the car mold, the output end of the push rod 21 pushes the trapezoidal block 22 to move horizontally along the slide rail 20. When the inclined surface of the trapezoidal block 22 contacts the roller 19, the horizontal thrust is converted into a vertical upward force through the inclined surface, pushing the moving plate 14 to move upward. The moving plate 14 drives the moving rod 13 and the ejector rod 15 to rise synchronously. The ejector rod 15 passes through the lower mold base 7 to eject the molded workpiece. During this process, the fixed ring 16 moves upward with the moving rod 13 and compresses the second spring 18. When the push rod 21 retracts, the restoring force of the second spring 18 drives the entire ejection mechanism to reset through the fixed ring 16. The inclined surface of the trapezoidal block 22 makes the ejection action fast and smooth, and the roller 19 reduces the motion friction, thereby achieving the purpose of rapid demolding.

[0041] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A stamping die for an automobile body with cushioning protection, comprising an outer shell (1), characterized in that: A fixing rod (2) is fixedly connected to the top of the outer shell (1), a top plate (3) is fixedly connected to the top of the fixing rod (2), a lower mold base (7) is fixedly connected to the top of the outer shell (1), a pressure plate (5) is slidably connected to the outer wall of the fixing rod (2), an upper mold base (6) is fixedly connected to the bottom of the pressure plate (5), and a buffer assembly is provided on the top of the outer shell (1). The buffer assembly includes a first buffer pad (8), a second buffer pad (10), and a first spring (11) sleeved on the outer wall of the fixed rod (2). The top of the first buffer pad (8) is fixedly connected to the bottom of the pressure plate (5), the bottom of the second buffer pad (10) is fixedly connected to the top of the outer shell (1), the bottom of the first buffer pad (8) is fixedly connected to a connecting rod (9), the outer wall of the connecting rod (9) is slidably connected to the inside of the second buffer pad (10), the bottom of the top plate (3) is fixedly connected to a hydraulic cylinder (4), the output end of the hydraulic cylinder (4) is fixedly connected to the top of the pressure plate (5), and a demolding assembly is provided inside the outer shell (1).

2. The automobile body stamping die with buffer protection according to claim 1, characterized in that: One end of the spring (11) is fixedly connected to the bottom of the pressure plate (5), and the other end of the spring (11) is fixedly connected to the top of the outer shell (1).

3. The automobile body stamping die with buffer protection according to claim 1, characterized in that: The demolding assembly includes an ejector rod (15) and a movable plate (14). The bottom of the ejector rod (15) is fixedly connected to the top of the movable plate (14). The outer wall of the ejector rod (15) is slidably connected to the inside of the outer shell (1) and the outer wall of the ejector rod (15) is slidably connected to the inside of the lower mold base (7).

4. The automobile body stamping die with buffer protection according to claim 3, characterized in that: The bottom of the movable plate (14) is fixedly connected to a movable rod (13), and a fixed plate (12) is slidably connected to the outer wall of the movable rod (13). The outer wall of the fixed plate (12) is fixedly connected to the inside of the outer shell (1).

5. The automobile body stamping die with buffer protection according to claim 4, characterized in that: The bottom of the fixed plate (12) is fixedly connected to a fixed block (17), the outer wall of the moving rod (13) is slidably connected to the inside of the fixed block (17), and the bottom of the moving rod (13) is fixedly connected to a fixed ring (16).

6. The automobile body stamping die with buffer protection according to claim 5, characterized in that: The outer wall of the movable rod (13) is fitted with a second spring (18), one end of the second spring (18) is fixedly connected to the bottom of the fixed block (17), and the other end of the second spring (18) is fixedly connected to the top of the fixed ring (16).

7. The automobile body stamping die with buffer protection according to claim 6, characterized in that: The bottom of the movable plate (14) is fixedly connected to a roller (19), and the top of the fixed plate (12) is fixedly connected to a slide rail (20). A trapezoidal block (22) is slidably connected inside the slide rail (20), and the top of the trapezoidal block (22) is in contact with the bottom of the roller (19).

8. The automobile body stamping die with buffer protection according to claim 7, characterized in that: A push rod (21) is fixedly connected to the top of the fixed plate (12), and the output end of the push rod (21) is fixedly connected to the outer wall of the trapezoidal block (22).

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