Retreating mechanism for multi-weight negative-angle stamping part

Abstract

The utility model discloses a retreating mechanism for a multi-weight negative angle stamping part. The retreating mechanism comprises an upper die base, a lower die base, a material pressing plate, a material lifting plate, a plurality of forming male dies and a plurality of forming female dies. The pressing plate is arranged right opposite to the part, the top of the pressing plate is connected with a vertically-arranged first nitrogen spring, and the first nitrogen spring is fixedly connected with the upper die base. The forming male dies are fixedly arranged on the upper die base corresponding to the negative angles of the parts, and the forming female dies are arranged on the lower die base in a sliding mode. Second nitrogen springs and inclined moving faces are arranged on the lower die base and correspond to the forming female dies, and the second nitrogen springs are used for driving the forming female dies to move along the moving faces. The bottom of the material lifting plate is connected with a third nitrogen spring, the third nitrogen spring is fixedly connected with the lower die base, and the material lifting plate is connected with a part. The acting force of the third nitrogen spring is larger than that of the second nitrogen spring. According to the utility model, the back-off action of the forming female die can be completed after multiple negative angles of a part are punched and formed in a one-time punching cycle process, and the size quality of the part is more stable.

Description

Technical Field

[0001] This utility model relates to the field of stamping technology for parts with multiple negative angles. More specifically, this utility model relates to a retraction mechanism for stamped parts with multiple negative angles. Background Technology

[0002] There are various ways to reduce energy consumption and emissions in the automotive industry, and lightweighting the vehicle body is an important one. The automotive industry primarily uses structural weight reduction. While meeting the functional requirements of the vehicle body, an increasing number of stamped individual parts are being geometrically optimized and merged into a single part to reduce the number of parts, weld points, vehicle weight, simplify manufacturing processes, and shorten manufacturing time, thereby enhancing product competitiveness. However, the merging of parts introduces problems such as increased spatial complexity, leading to more complex mold manufacturing processes, more complex mold structures, and reduced material utilization. Reducing mold manufacturing processes is an effective way to lower mold development and manufacturing costs while ensuring product stability and quality. The core of reducing the number of mold manufacturing processes is designing a compact and stable mold structure for efficient stamping production. Conventional stamped parts are generally designed to avoid negative stamping angles in the initial stages, or to minimize negative stamping angle areas, ensuring the feasibility of the mold structure and ensuring that the mold can smoothly shape the negative stamping angle areas. In recent years, with more and more stamped sub-parts being merged into a single part, the part itself has multiple negative stamping angles, with two or more negative angle areas within its own cavity. This undoubtedly presents both significant challenges and opportunities for stamping die development. Therefore, it is necessary to develop a compact stamping negative angle retraction mechanism to effectively address the aforementioned issues. Utility Model Content

[0003] One object of this invention is to solve at least the problems described above and to provide at least the advantages that will be explained later.

[0004] To achieve these objectives and other advantages according to this utility model, a multi-negative-angle stamping part retraction mechanism is provided, comprising: an upper die base, a lower die base, a pressure plate, a lifting plate, multiple forming punches, and multiple forming dies; the pressure plate is positioned facing the part, and a vertically arranged first nitrogen spring is connected to its top, the first nitrogen spring being fixedly connected to the upper die base; each forming punch is fixedly arranged on the upper die base corresponding to a negative angle of the part, and each forming die is slidably arranged on the lower die base, with the forming punches and dies arranged in a one-to-one correspondence; a second nitrogen spring and an inclined moving surface are provided on the lower die base corresponding to each forming die, the second nitrogen spring being used to drive the forming die to move along the moving surface; a vertically arranged third nitrogen spring is connected to the bottom of the lifting plate, the other end of the third nitrogen spring being fixedly connected to the lower die base, and the lifting plate being connected to the part; the force of the third nitrogen spring is greater than the force of the second nitrogen spring.

[0005] Preferably, the force of the first nitrogen spring is greater than that of the third nitrogen spring.

[0006] Preferably, the inclination direction of each of the moving surfaces is upward from the negative angle of the part toward the center of the part.

[0007] Preferably, each of the forming dies has a dovetail-shaped sliding block on its bottom surface that moves along the moving surface, and each of the moving surfaces has a groove that cooperates with the sliding block.

[0008] Preferably, the tilt angle of the second nitrogen spring is the same as the tilt angle of the moving surface, and each of the grooves has a mounting groove on its bottom surface parallel to the moving surface, and the second nitrogen spring is disposed in the mounting groove.

[0009] Preferably, the length of the sliding block is set along the entire length of the forming die.

[0010] Preferably, a lubricating oil groove is formed on the inner wall of the groove.

[0011] This utility model has at least the following beneficial effects:

[0012] 1. The multi-negative angle stamping part retraction mechanism provided by this utility model completes the forming of multiple negative angles of the part in one stamping process. The forming die and the part complete the negative angle retraction action under the action of the second nitrogen spring and the third nitrogen spring, respectively. Compared with the traditional side forming oblique wedge mechanism, the spatial structure is more compact, the stroke control is more precise, and the manufacturing cost is lower.

[0013] 2. The multi-negative angle stamping part retraction mechanism provided by this utility model can complete multiple stamping negative angles in one stamping process, which can obtain parts with more stable and consistent dimensions and quality, improve the production SPM value (the number of parts that the mold can cut per unit time), and reduce the mold development cost.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the structure of the multi-negative-angle stamping part retraction mechanism of this utility model when the stamping die is closed;

[0016] Figure 2 This is an elevation sectional view of the multi-negative angle stamping part retraction mechanism of this utility model when the first nitrogen spring stroke is released.

[0017] Figure 3 This is a schematic diagram of the structure of the multi-negative angle stamping part retraction mechanism of this utility model when the third nitrogen spring stroke is released;

[0018] Figure 4 This is a schematic diagram of the structure of one of the forming dies of this utility model; Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings, so that those skilled in the art can implement it based on the description.

[0020] It should be noted that, unless otherwise specified, the experimental methods described in the following embodiments are all conventional methods, and the reagents and materials described are all commercially available unless otherwise specified. In the description of this utility model, the terms "lateral", "longitudinal", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing 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.

[0021] like Figures 1 to 4As shown, this utility model provides a multi-negative-angle stamping part retraction mechanism, including: an upper die base 5, a lower die base 1, a pressure plate 4, a lifting plate 6, multiple forming punches 3, and multiple forming dies 2; the pressure plate 4 is positioned directly opposite the part, and a vertically arranged first nitrogen spring 9 is connected to its top, the first nitrogen spring 9 being fixedly connected to the upper die base 5; each forming punch 3 is fixedly mounted on the upper die base 5 corresponding to each negative angle of the part 7, and each forming die 2 is slidably mounted on the lower die base 1, the forming punches 3 and the lower die 2 are slidably mounted on the lower die base 1, the forming punches 3 and the lower die 4 are fixedly mounted on the upper die base 5, the upper die base 5 is fixedly mounted on the upper die base 5, and the lower die 2 is slidably mounted on the lower die base 1, the upper die base 5 is fixedly mounted on the upper die base 5, the lower die base 1 is fixedly mounted on the upper die base 5, the lower die 4 is fixedly mounted on the upper die base 5, the lower die 5 is fixedly mounted on the upper die base 5, the lower die 6 is fixedly mounted on the upper die base 5, the lower die 7 is fixedly mounted on the upper die base 5, and the lower die 6 is fixedly mounted on the upper die base 5, ... The mold 3 and the forming die 2 are arranged in a one-to-one correspondence; the lower mold base 1 is provided with a second nitrogen spring 8 and an inclined moving surface 11 for each forming die 2, the second nitrogen spring 8 is used to drive the forming die 2 to move along the moving surface 11; the bottom of the lifting plate 6 is connected to a vertically arranged third nitrogen spring, the other end of the third nitrogen spring is fixedly connected to the lower mold base 1, and the lifting plate 6 is connected to the part 7; the force of the third nitrogen spring is greater than the force of the second nitrogen spring.

[0022] In this technical solution, during the stamping process, the upper die holder 5 moves downward, compressing the second nitrogen spring 8, the third nitrogen spring, and the first nitrogen spring 9. The interaction between each forming punch 3 and the corresponding forming die 2 completes the forming of multiple negative angles of the part in one operation. Then, as the stamping die opens, the first nitrogen spring 9 releases its stroke as the upper die holder 5 moves upward. This release stroke is the process by which the elastic elements recover their initial length as the external force compressing each elastic element gradually disappears. Then, each forming die 2 slides along the moving surface 11 under the action of the corresponding second nitrogen spring 8. At the same time, the third nitrogen spring drives the part 7 upward through the lifting plate 6. When the pressure plate 4 separates from the part, the part 7 also separates from each of the forming dies 6, and the part can be moved to the next process without contact interference.

[0023] In another technical solution, the force of the first nitrogen spring 9 is greater than that of the third nitrogen spring. When the mold is opened, the first nitrogen spring 9 releases its stroke first. During this process, the pressure plate 4 always presses against the part 7.

[0024] In another technical solution, the inclination direction of each of the moving surfaces 11 is upward from the negative angle of the part towards the center of the part. When the second nitrogen spring 8 releases its stroke, it pushes the corresponding forming die 2 from the negative angle region towards the center of the part, so that the forming die 2 leaves the negative angle region and avoids contact and interference with the part during demolding.

[0025] In another technical solution, such as Figure 4As shown, each of the forming dies 2 has a dovetail-shaped sliding block 21 on its bottom surface that moves along the moving surface 11, and each of the moving surfaces 11 has a groove 10 that cooperates with the sliding block 21.

[0026] Furthermore, the length of the sliding block 21 is set along the entire length direction of the forming die 2.

[0027] The sliding of the forming die 2 along the moving surface 11 is guided by the groove 10, making the sliding process more stable.

[0028] In another technical solution, the tilt angle of the second nitrogen spring 8 is the same as the tilt angle of the moving surface 11. The second nitrogen spring 8 is arranged parallel to the moving surface 11, so that the stroke release direction and the force direction of the second nitrogen spring 8 are parallel to the moving surface 11, thereby enabling the molding die 2 to slide along the moving surface 11 stably and accurately.

[0029] In another technical solution, a lubricating oil groove is provided on the inner wall of the groove 10 to ensure the smoothness of the sliding of the forming die 2.

[0030] The multi-negative-angle stamping part retraction mechanism, when in use, specifically includes the following process:

[0031] The stamping die closing process: As the press drives the upper die holder 5 downward, the second nitrogen spring 8, the third nitrogen spring, and the first nitrogen spring 9 are compressed in sequence. Each forming punch 3 and the corresponding forming die 2 jointly apply pressure to the part 9, completing multiple negative angle stamping processes, such as... Figure 1 As shown;

[0032] Stamping die opening process: The punch press drives the upper die holder 5 upward, and the stroke of the first nitrogen spring 9 begins to release first. During this process, the forming punch 6 moves away from the part 7 along with the upper die holder 5. The pressure plate 4, part 7, lifting plate 6, and each forming die 2 remain stationary. Figure 2 As shown; during the release of the first nitrogen spring 9, the pressure plate 4 remains in contact with the part 7, and the pressure gradually decreases; during the continuous upward movement of the upper mold base 5, after the first nitrogen spring 9 completes its release, the second nitrogen spring 8 and the third nitrogen spring simultaneously begin to release their strokes, and each forming die 2 moves upward along the moving surface 11, and the part moves upward synchronously under the action of the lifting plate 6; when the upper mold base 5 completes its upward stroke, the pressure plate 4 separates from the part 7, and after the second elastic unit 8 completes its release, each forming die 2 stops moving and has left the negative angle area of ​​the part 7; since the rebound force of the third nitrogen spring is greater than that of the second nitrogen spring, its stroke lags behind the completion of the release of the second nitrogen spring 8, thus continuing to lift the part 8 upward until it is completely separated from each forming die 2, as shown. Figure 3 As shown. At this point, there is no contact interference between the upward-moving spatial areas of each negative angle region of part 7, and it can be directly moved to the next process.

[0033] Although the embodiments of this utility model have been disclosed above, they are not limited to the applications listed in the specification and embodiments. They can be applied to various fields suitable for this utility model. For those skilled in the art, other modifications can be easily made. Therefore, without departing from the general concept defined by the claims and their equivalents, this utility model is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A retraction mechanism for multiple negative angle stamped parts, characterized in that, include: The assembly includes an upper die base, a lower die base, a pressure plate, a lifting plate, multiple forming punches, and multiple forming dies. The pressure plate is positioned directly opposite the part and has a vertically arranged first nitrogen spring connected to its top, which is fixedly connected to the upper die base. Each forming punch is fixedly mounted on the upper die base at a negative angle corresponding to the part, and each forming die is slidably mounted on the lower die base. The forming punches and dies are arranged in a one-to-one correspondence. The lower die base has a second nitrogen spring and an inclined moving surface corresponding to each forming die. The second nitrogen spring drives the forming die to move along the moving surface. The bottom of the lifting plate is connected to a vertically arranged third nitrogen spring, the other end of which is fixedly connected to the lower die base. The lifting plate is connected to the part. The force of the third nitrogen spring is greater than that of the second nitrogen spring.

2. The multi-negative-angle stamping part retraction mechanism as described in claim 1, characterized in that, The force of the first nitrogen spring is greater than that of the third nitrogen spring.

3. The multi-negative-angle stamping part retraction mechanism as described in claim 1, characterized in that, The inclination direction of each of the moving surfaces is upward from the negative angle of the part toward the center of the part.

4. The multi-negative-angle stamping part retraction mechanism as described in claim 1, characterized in that, Each of the forming dies has a dovetail-shaped sliding block on its bottom surface that moves along the moving surface, and each of the moving surfaces has a groove that mates with the sliding block.

5. The multi-negative-angle stamping part retraction mechanism as described in claim 4, characterized in that, The tilt angle of the second nitrogen spring is the same as the tilt angle of the moving surface.

6. The multi-negative-angle stamping part retraction mechanism as described in claim 4, characterized in that, The length of the sliding block is set along the length direction of the forming die.

7. The multi-negative-angle stamping part retraction mechanism as described in claim 4, characterized in that, A lubricating oil groove is formed on the inner wall of the groove.

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