Automobile seat slide rail precision stamping device

Abstract

The utility model discloses a kind of automobile seat slide rail precision stamping device, it is related to sheet metal stamping forming technical field;The device includes upper die assembly, lower die assembly and edge ring, its innovation is in lower die seat integrated with two sets of systems: vacuum adsorption positioning system, including the profile of being communicated with vacuum chamber by micropore, vacuum interface, blank is firmly adsorbed to profile using negative pressure, realizes non-injury accurate positioning;Local liquid chamber anti-rebound system, including the liquid cavity of being arranged at the root of U-shaped groove, flexible sealing gasket and overflow valve, support reaction force is provided by controllable hydraulic pressure when stamping ends, actively suppress material rebound;The utility model with simple fluid control structure effectively solves the two major industry problems of blank accurate positioning and rebound control, significantly improves the size and shape accuracy of slide rail product, has very high practical value and popularization prospect.

Description

Technical Field

[0001] This utility model relates to the field of machinery, and more particularly to metal sheet stamping technology, especially a precision stamping device for automotive seat slide rails. Background Technology

[0002] The car seat frame is an important component of the car safety system. Its strength and lightweight level are directly related to the safety of the occupants and the energy efficiency of the whole vehicle. Adding reinforcing ribs to the stamped parts of the seat frame is a key means to improve its rigidity and strength. However, in traditional stamping processes, especially when using high-strength steel plates or when forming deep and steep reinforcing ribs, technical problems such as insufficient material fluidity, incomplete filling, and micro-cracks or fractures easily appearing at the root of the reinforcing ribs are often encountered.

[0003] To address these issues, the industry typically employs methods such as adding processes (e.g., step-by-step stamping), reducing stamping speed, or using more ductile materials. However, these methods can lead to reduced production efficiency, increased costs, or failure to achieve lightweighting goals. In addition, there have been attempts to use complex control technologies such as hydraulic or servo-assisted blanking, but their effectiveness in improving material flowability is limited, and the system costs are high.

[0004] Therefore, there is an urgent need for a new type of stamping device that can effectively promote material flow in difficult-to-form areas, improve product quality and yield, and has a compact structure that is easy to integrate into existing production lines. Utility Model Content

[0005] The purpose of this invention is to overcome the shortcomings of the prior art and provide a precision stamping device for automotive seat slide rails. This device achieves ultra-high precision positioning of the blank and active suppression of springback by introducing fluid control technology.

[0006] To achieve the above objectives, this utility model provides a precision stamping device for automotive seat slide rails, comprising an upper die assembly, a lower die assembly, and a pressure ring. The upper die assembly includes an upper template, a punch fixing plate, and a main punch. The lower die assembly includes a lower template and a lower die base that cooperates with the main punch.

[0007] The lower mold base integrates a vacuum adsorption positioning system for adsorbing and fixing the blank and a local liquid bladder anti-springback system for suppressing forming springback.

[0008] The vacuum adsorption positioning system includes a number of microholes formed on the working surface of the lower mold base, a vacuum chamber disposed inside the lower mold base and connected to all the microholes through a flow channel, and a vacuum interface disposed on the side wall of the lower mold base for connecting an external vacuum generator.

[0009] The local liquid bladder anti-rebound system is provided at the corner of the U-shaped molding groove of the lower mold base. The local liquid bladder anti-rebound system includes a liquid cavity machined in the lower mold base, a flexible sealing gasket embedded in the top opening of the liquid cavity, and an overflow valve connected to the liquid cavity through a hydraulic pipeline. The flexible sealing gasket is higher than the groove wall of the U-shaped molding groove.

[0010] Furthermore, the present invention provides a precision stamping device for automotive seat slide rails, wherein at least one sealing ring is embedded on the lower surface of the pressing ring, and the position of the sealing ring corresponds to the contact area with the blank during pressing.

[0011] Furthermore, this utility model provides a precision stamping device for automotive seat slide rails, wherein the overflow valve is an adjustable overflow valve, and the overflow valve is installed on the outer side wall of the lower die base via a valve seat.

[0012] Furthermore, the present invention provides a precision stamping device for automotive seat slide rails, wherein the lower die assembly further includes an ejector mechanism, the ejector mechanism including a vertically movable ejector rod, the ejector rod passing vertically through the lower die plate, the vacuum chamber and the lower die base in sequence.

[0013] Furthermore, this utility model provides a precision stamping device for automotive seat slide rails, wherein the outer contour of the flexible sealing gasket is interference-fitted with the top opening of the liquid cavity, and the top surface of the flexible sealing gasket is smoothly connected to the working surface of the lower die base.

[0014] Furthermore, the present invention provides a precision stamping device for automotive seat slide rails, wherein the microholes are uniformly distributed on the working surface of the lower die base, and the diameter of the microholes is 0.1 mm to 0.3 mm.

[0015] Furthermore, this utility model provides a precision stamping device for automotive seat slide rails, wherein the liquid chamber, hydraulic pipeline, and overflow valve inlet together constitute a sealed cavity filled with hydraulic oil.

[0016] Furthermore, the present invention provides a precision stamping device for automotive seat slide rails, wherein the vacuum adsorption positioning system and the local liquid bladder anti-rebound system are independent systems inside the lower mold base, and the vacuum chamber and the liquid chamber are not spatially connected.

[0017] Compared with the prior art, the precision stamping device for automotive seat slide rails of this utility model has the following advantages:

[0018] During the stamping process, the blank holder first presses down on the edge of the blank and forms a seal. Then, the vacuum adsorption system is activated to firmly adsorb the blank onto the lower die, achieving precise positioning across the entire area without mechanical damage and fundamentally eliminating positioning errors. In the stamping forming stage, when the material flows to the corner of the U-shaped groove, the local liquid bladder system begins to function. Through preset hydraulic support force, it actively counteracts the springback tendency of the material, achieving "active correction within the die," significantly reducing the springback angle of the finished product and improving shape accuracy. The entire system has a compact structure and reliable operation. Through the design of the lower die, it solves two major core problems in precision stamping and has great industrial application value. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a precision stamping device for automotive seat slide rails according to the present invention;

[0020] Figure 2 for Figure 1 Schematic diagram of a partial structure.

[0021] The components are: 1. Pressure ring; 2. Upper template; 3. Punch fixing plate; 4. Main punch; 5. Lower template; 6. Lower mold base; 7. Sealing ring; 8. Microhole; 9. Vacuum chamber; 10. Vacuum interface; 11. U-shaped molding groove; 12. Liquid chamber; 13. Flexible sealing gasket; 14. Overflow valve; 15. Ejector rod. Detailed Implementation

[0022] The technical solution of this utility model will be clearly and completely described below with reference to the embodiments and accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component 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. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] like Figure 1 and Figure 2 As shown, this embodiment provides a precision stamping device for automotive seat slide rails, which includes an upper die assembly, a lower die assembly, and a blank holder 1. The upper die assembly includes an upper template 2, a punch fixing plate 3, and a main punch 4. The lower die assembly includes a lower template 5, a lower die base 6 that cooperates with the main punch 4, and an ejection mechanism. At least one sealing ring 7 is embedded on the lower surface of the blank holder 1. The position of the sealing ring 7 corresponds to the contact area with the blank during blanking.

[0026] The lower mold base 6 integrates a vacuum adsorption positioning system for adsorbing and fixing the blank and a local liquid bladder anti-springback system for suppressing forming springback.

[0027] The vacuum adsorption positioning system includes a plurality of microholes 8 formed on the working surface of the lower mold base 6, a vacuum chamber 9 disposed inside the lower mold base 6 and connected to all the microholes 8 through a flow channel, and a vacuum interface 10 disposed on the side wall of the lower mold base 6 for connecting an external vacuum generator; the microholes 8 are evenly distributed on the working surface of the lower mold base 6, and the diameter of the microholes 8 is 0.1 mm to 0.3 mm;

[0028] The localized liquid bladder anti-rebound system is configured at the corner of the U-shaped molding groove 11 of the lower mold base 6. The system includes a liquid cavity 12 machined within the lower mold base 6, a flexible sealing gasket 13 embedded in the top opening of the liquid cavity 12, and an overflow valve 14 connected to the liquid cavity 12 via a hydraulic line. The flexible sealing gasket 13 protrudes above the wall of the U-shaped molding groove 11, and its outer contour is interference-fitted with the top opening of the liquid cavity 12. The top surface of the flexible sealing gasket 13 smoothly connects to the working surface of the lower mold base 6. The overflow valve 14 is an adjustable overflow valve, mounted on the outer sidewall of the lower mold base 6 via a valve seat. The liquid cavity 12, the hydraulic line, and the inlet of the overflow valve 14 together form a sealed cavity filled with hydraulic oil.

[0029] The ejection mechanism includes a vertically movable ejector rod 15, which passes vertically through the lower template 5, the vacuum chamber 9, and the lower mold base 6 in sequence.

[0030] The vacuum adsorption positioning system and the local liquid bladder anti-rebound system are independent systems inside the lower mold base 6, and the vacuum chamber 9 and the liquid chamber 12 are not spatially connected.

[0031] Example

[0032] The precision stamping device for automotive seat slide rails provided in this embodiment mainly includes an upper die assembly, a lower die assembly, and a pressure ring 1;

[0033] The upper die assembly includes, from top to bottom, an upper template 2, a punch fixing plate 3, and a main punch 4. The upper template 2 is used to connect with the slide block of the press. The punch fixing plate 3 is fixed to the upper template 2 by bolts. The main punch 4 is fixed at its lower part by bolts and positioning pins. The working surface of the main punch 4 corresponds to the U-shaped section of the car seat slide rail to be formed. The lower die assembly includes a lower template 5 and a lower die base 6 fixed thereon. The cavity of the lower die base 6 cooperates with the main punch 4 to form the final shape of the slide rail. The blank holder 1 is movably set above the lower die base 6 and is driven by an independent blank holder cylinder. It is used to press the edge of the blank before stamping. An annular groove is machined on the lower surface of the blank holder 1 and a sealing ring 7 is embedded therein. It is used to form a seal with the blank during pressing.

[0034] The core improvement of this solution lies in the two systems integrated within the lower mold base 6:

[0035] I. Vacuum Adsorption Positioning System:

[0036] On the working surface of the lower die base 6, densely distributed microholes 8 are opened through precision machining technology. The diameter of these microholes 8 is between 0.1-0.3mm, which is sufficient to generate adsorption force without leaving marks on the surface of the blank. All microholes 8 are connected to a vacuum chamber 9 located inside the lower die base 6 through internal flow channels. The vacuum chamber 9 is connected to an external high-frequency vacuum generator through a vacuum interface 10. When the pressure ring 1 is pressed down and a sealing area is formed through the sealing ring 7, the vacuum generator is started. Within tens to hundreds of milliseconds, the air in the vacuum chamber 9 and under the blank is removed, so that the blank is uniformly and strongly adsorbed on the surface under atmospheric pressure, achieving perfect positioning.

[0037] II. Localized Liquid-Filled Anti-Rebound System:

[0038] At the root rounded corner of the U-shaped molding groove 11 of the lower mold base 6, a liquid cavity 12 is machined. The liquid cavity 12 is a closed cavity, and a flexible sealing gasket 13 is embedded at its top opening by interference fit. The flexible sealing gasket 13 is made of polyurethane material with high wear resistance, oil resistance and fatigue resistance. Its top surface smoothly transitions with the surface of the lower mold base 6 and is slightly higher than the groove wall of the U-shaped molding groove. The liquid cavity 12 is connected to an adjustable overflow valve 14 installed on the side of the lower mold base 6 through a hydraulic pipeline. The inlet space of the liquid cavity 12, the hydraulic pipeline and the overflow valve 14 is filled with incompressible hydraulic oil.

[0039] Its working principle is as follows: When the main punch 4 presses the blank into the lower die 6, in the final stage of the stamping stroke, the blank closely adheres to and presses the flexible sealing gasket 13, attempting to deform it and compress the volume of the liquid cavity 12. Due to the incompressibility of hydraulic oil, the pressure in the liquid cavity 12 rises sharply. When this pressure reaches the preset opening pressure of the overflow valve 14 (this pressure can be accurately calculated and set according to the material's springback force), the overflow valve 14 remains open, so that the pressure in the liquid cavity 12 is precisely controlled at the preset value. This stable hydraulic pressure is transmitted to the corner area of ​​the blank through the flexible sealing gasket 13, forming a strong and continuous supporting reaction force. This force is just used to balance the springback stress inside the material, thereby "shaping" the material in a plastic state and greatly reducing springback.

[0040] In addition, the lower mold assembly is equipped with a conventional ejection mechanism. Its ejector rod 15 passes through the vacuum chamber 9 and its top end is flush with the surface of the lower mold base 6. After the stamping is completed, the vacuum is released and the ejector rod 15 moves upward to eject the finished part.

[0041] Any aspects of this utility model not described in detail are well-known technologies to those skilled in the art.

[0042] The preferred embodiments of this utility model have been described in detail above. It should be understood that those skilled in the art can make numerous modifications and variations based on the concept of this utility model without creative effort. Therefore, all technical solutions that can be obtained by those skilled in the art based on the concept of this utility model through logical analysis, reasoning, or limited experimentation on the basis of existing technology should be within the scope of protection defined by the claims.

Claims

1. A precision stamping device for automotive seat slide rails, characterized in that, The assembly includes an upper die assembly, a lower die assembly, and a pressure ring. The upper die assembly includes an upper template, a punch fixing plate, and a main punch. The lower die assembly includes a lower template and a lower die base that mates with the main punch. The lower mold base integrates a vacuum adsorption positioning system for adsorbing and fixing the blank and a local liquid bladder anti-springback system for suppressing forming springback. The vacuum adsorption positioning system includes a number of microholes formed on the working surface of the lower mold base, a vacuum chamber disposed inside the lower mold base and connected to all the microholes through a flow channel, and a vacuum interface disposed on the side wall of the lower mold base for connecting an external vacuum generator. The local liquid bladder anti-rebound system is provided at the corner of the U-shaped molding groove of the lower mold base. The local liquid bladder anti-rebound system includes a liquid cavity machined in the lower mold base, a flexible sealing gasket embedded in the top opening of the liquid cavity, and an overflow valve connected to the liquid cavity through a hydraulic pipeline. The flexible sealing gasket is higher than the groove wall of the U-shaped molding groove.

2. The precision stamping device for automotive seat slide rails according to claim 1, characterized in that, The lower surface of the pressing ring is fitted with at least one sealing ring, the position of which corresponds to the contact area with the blank during pressing.

3. The precision stamping device for automotive seat slide rails according to claim 1, characterized in that, The overflow valve is an adjustable overflow valve, which is mounted on the outer side wall of the lower mold base via a valve seat.

4. The precision stamping device for automotive seat slide rails according to claim 1, characterized in that, The lower mold assembly also includes an ejection mechanism, which includes a vertically movable ejector rod that passes vertically through the lower mold plate, the vacuum chamber, and the lower mold base in sequence.

5. The precision stamping device for automotive seat slide rails according to claim 1, characterized in that, The outer contour of the flexible sealing gasket is interference-fitted with the top opening of the liquid cavity, and the top surface of the flexible sealing gasket is smoothly connected with the working surface of the lower mold base.

6. The precision stamping device for automotive seat slide rails according to claim 1, characterized in that, The micropores are evenly distributed on the working surface of the lower mold base, and the diameter of the micropores is 0.1 mm to 0.3 mm.

7. The precision stamping device for automotive seat slide rails according to claim 1, characterized in that, The liquid chamber, hydraulic pipeline, and overflow valve inlet together form a sealed cavity filled with hydraulic oil.

8. The precision stamping device for automobile seat slide rails according to any one of claims 1 to 7, characterized in that, The vacuum adsorption positioning system and the local liquid bladder anti-rebound system are independent systems inside the lower mold base, and the vacuum chamber and the liquid chamber are not spatially connected.

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