A stamping die for automobile connecting plate flanging

Abstract

The application discloses a stamping die for flanging of a connecting plate of an automobile, and belongs to the technical field of stamping forming. The stamping die comprises an upper die seat and a lower die seat which are correspondingly arranged, a male die is fixed to the lower end of the upper die seat, a female die is movably connected to the upper die seat, a flanging insert block for flanging forming of the connecting plate is further fixed to the lower die seat outside the female die, a flange pressing mechanism which is located outside the male die is movably connected to the upper die seat, the flange pressing mechanism comprises a flange pressing insert block which is in position correspondence with the flanging insert block and a pressure source for providing downward elastic pressure to the flange pressing insert block, and the feeding speed of the plate is controlled by controlling the pressure of the flange pressing insert block on the edge of the plate. In this way, by arranging the floating flange pressing mechanism, dynamic control of the feeding speed in the flanging process is realized, wrinkles caused by too fast feeding and cracks caused by insufficient feeding are effectively avoided, and the flanging forming quality and production efficiency are improved.

Description

Technical Field

[0001] This invention relates to the field of stamping forming technology for automotive parts, and in particular to a stamping die for flanging automotive connecting plates. Background Technology

[0002] In automotive body structures, the left and right connecting plates are key structural components used to connect the floor lining to the seat mounting beams. The left and right connecting plates are symmetrically distributed on both sides of the floor lining, with the edges of the connecting plates requiring flanging to form mounting surfaces for connection with other components and to reinforce the structure. To simplify the manufacturing process, existing stamping dies have cavities for both the left and right connecting plates, symmetrically distributed.

[0003] In the prior art, the flanging of the connecting plate edge is usually achieved by using a flanging insert fixed on the lower die base. During stamping, the punch presses down and drives the sheet metal to move downward. After the edge of the sheet metal contacts the fixed flanging insert, it is folded and formed. However, in the actual production process, the feeding speed of the flanging process is difficult to control precisely and cannot be dynamically adjusted according to the material characteristics and forming requirements. The following problems exist: (1) If the feeding speed is too fast, the sheet metal is prone to accumulate and wrinkle in the flanging area, and even material sludge and blockage may occur, resulting in scrapped parts; (2) If the feeding speed is too slow, the material in the flanging area is prone to thinning or even cracking, and it will also reduce the production cycle and affect production efficiency.

[0004] Existing technologies lack active constraints and buffering mechanisms for the sheet material feeding speed during the flanging process, making it impossible to balance forming quality and production efficiency, and thus failing to meet the requirements for high-precision and high-stability flanging processing. Summary of the Invention

[0005] To address the technical problems existing in the background art, the present invention proposes a stamping die for flanging automotive connecting plates.

[0006] This invention proposes a stamping die for flanging automotive connecting plates, comprising an upper die base and a lower die base correspondingly arranged. A punch is fixed at the lower end of the upper die base, and a die is movably connected to the lower die base. A cavity for connecting plates is formed between the punch and the die. A flanging insert for flanging the connecting plate material is also fixed on the lower die base located outside the die. A pressing mechanism located outside the punch is movably connected inside the upper die base. The pressing mechanism includes a pressing insert corresponding to the position of the flanging insert and a pressure source for providing downward elastic pressure to the pressing insert. By controlling the pressure of the pressing insert on the edge of the sheet material, the feeding speed of the sheet material is controlled, so that the edge of the sheet material feeds into the inside of the flanging insert at a controlled speed under the pressure of the pressing insert and is folded into shape.

[0007] Preferably, the pressing insert is slidably connected to the upper mold base through multiple guide posts, the upper mold base has multiple guide holes that slide with the multiple guide posts, and the lower end face of the pressing insert is also fixed with several balance blocks, and the pressure source is disposed between the upper mold base and the pressing insert.

[0008] Preferably, the pressure source is a plurality of nitrogen springs with adjustable pressure, and the plurality of nitrogen springs are spaced apart along the length direction of the pressing insert. The upper end of the nitrogen spring is fixed to the upper mold base, and its lower end is in contact with or fixedly connected to the upper end surface of the pressing insert.

[0009] Preferably, an elastic support member is provided between the die cavity and the lower die base.

[0010] Preferably, the lower end face of the pressing insert is provided with a pressing surface that matches the profile of the flange edge of the sheet metal, and the pressing surface is an arc surface or a plane.

[0011] Preferably, there is a height difference between the lower end face of the pressing insert and the lower end face of the punch, and when the upper die holder is at the upper stop point, the lower end face of the pressing insert is lower than the lower end face of the punch.

[0012] In summary, the present invention has the following beneficial effects: (1) By setting a floating pressing mechanism on the upper die base, the pressing insert presses the edge of the sheet metal against the upper surface of the flanging insert under the action of the pressure source during the stamping process. The edge of the sheet metal feeds into the inside of the flanging insert at a controlled speed under the pressing state. Compared with the traditional fixed flanging insert structure, this solution realizes the dynamic adjustment of the feeding speed and avoids the problem of material accumulation and wrinkling caused by feeding too fast; (2) By adjusting the pressure value of the pressure source, the feeding speed of the sheet metal edge can be precisely controlled. When the flanging area requires more material, the pressure of the pressure source can be reduced to speed up the feeding speed and increase the feeding amount, avoiding cracking of the flanging area due to insufficient material. This active control method fundamentally solves the defect of the non-adjustable feeding amount in the traditional process; (3) A floating die is set on the lower die base to cooperate with the punch to complete the forming of the main body of the sheet metal. The floating design of the die allows it to move synchronously with the downward movement of the punch, ensuring the consistency of the forming of the sheet metal body and the flanging area, and avoiding deformation caused by uneven local stress.

[0013] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0014] Figure 1 This is a perspective view of a stamping die for flanging an automotive connecting plate according to an embodiment of the present invention;

[0015] Figure 2The left and right connecting plates are finished products produced by the stamping die according to an embodiment of the present invention;

[0016] Figure 3 This is a schematic diagram of the upper die of a stamping die according to an embodiment of the present invention;

[0017] Figure 4 This is a schematic diagram of the lower die of a stamping die according to an embodiment of the present invention;

[0018] Figure 5 The three-dimensional shape of the pressing mechanism in an embodiment of the present invention Figure 1 ;

[0019] Figure 6 The three-dimensional shape of the pressing mechanism in an embodiment of the present invention Figure 2 .

[0020] In the picture:

[0021] 1. Upper mold base; 11. Punch;

[0022] 2. Lower mold base; 21. Cavity mold; 22. Flanged insert;

[0023] 3. Edge pressing mechanism; 31. Edge pressing insert; 32. Guide post; 33. Balance block; 34. Nitrogen spring. Detailed Implementation

[0024] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar symbols 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 are only used to explain the present invention, and should not be construed as limiting the present invention.

[0025] like Figure 1-6 As shown in the figure, this embodiment proposes a stamping die for flanging an automotive connecting plate, including an upper die base 1 and a lower die base 2. A punch 11 is fixed at the lower end of the upper die base 1, and a die 21 (which can float up and down) is movably connected to the lower die base 2. A cavity for the connecting plate is formed between the punch 11 and the die 21. A flanging insert 22 for flanging the connecting plate is also fixed on the lower die base 2 located outside the die 21. A pressing mechanism 3 located outside the punch 11 is movably connected inside the upper die base 1, so that the pressing mechanism 3 can float up and down. The pressing mechanism 3 includes a pressing insert 31 corresponding to the position of the flanging insert 22 and a pressure source for providing downward elastic pressure to the pressing insert 31. By controlling the pressure of the pressing insert 31 on the edge of the plate, the feeding speed of the plate is controlled, so that the edge of the plate is fed into the inside of the flanging insert 22 at a controlled speed under the pressure of the pressing insert 31 and folded into shape.

[0026] The inner side of the flange insert 22 is provided with a flange forming surface that matches the flange contour of the connecting plate material, which is used to complete the folding and forming of the edge of the plate material during the stamping process.

[0027] Thus, by actively constraining the feeding speed of the sheet metal by the pressing mechanism 3, wrinkling, caking, and blockage caused by excessive feeding are avoided, significantly improving the flanging forming quality. The floating pressing mechanism 3 is compatible with automated feeding lines, maintaining a high production cycle while ensuring forming quality. The floating design of the die 21 allows it to move synchronously with the punch 11 as it moves downward, ensuring the consistency of the sheet metal body and the flanging area forming, and avoiding deformation caused by uneven local stress.

[0028] Furthermore, the pressing insert 31 is slidably connected to the upper mold base 1 through multiple guide posts 32. The upper mold base 1 has multiple guide holes that slide with the multiple guide posts 32. Several balance blocks 33 are also fixed on the lower end face of the pressing insert 31. The pressure source is set between the upper mold base 1 and the pressing insert 31.

[0029] Specifically, multiple guide posts 32 are evenly distributed on the upper surface of the edge-pressing insert 31 to ensure the verticality, guiding accuracy, and smoothness of the edge-pressing insert 31 during its up-and-down floating process. At the same time, multiple balance blocks 33 are evenly distributed on the edge-pressing insert 31 to ensure the horizontal balance of the edge-pressing insert 31 during its floating process and to prevent uneven distribution of the edge-pressing force due to eccentric loading.

[0030] In this embodiment, the pressure source is a number of nitrogen springs 34 with adjustable pressure (when the pressure value of the nitrogen spring 34 increases, the feeding speed slows down; when the pressure value of the nitrogen spring 34 decreases, the feeding speed speeds up). The multiple nitrogen springs 34 are distributed at intervals along the length direction of the pressing insert 31. The upper end of the nitrogen spring 34 is fixed to the upper mold base 1, and its lower end is in contact with or fixedly connected to the upper end surface of the pressing insert 31.

[0031] Among them, the nitrogen spring 34 has the advantages of stable pressure, rapid response, and small size, making it particularly suitable for blank holder applications in stamping dies. By adjusting the air pressure of the nitrogen spring 34, the blank holder force can be precisely controlled.

[0032] It should be noted that the lower end face of the pressing insert 31 is provided with a pressing surface that matches the contour of the flange edge of the sheet metal. The pressing surface is either curved or flat.

[0033] Furthermore, there is a height difference between the lower end face of the pressure plate 31 and the lower end face of the punch 11. When the upper die holder 1 is at the upper stop point, the lower end face of the pressure plate 31 is lower than the lower end face of the punch 11. The height difference design ensures that when the upper die holder 1 moves downward, the pressure plate 31 contacts the sheet metal before the punch 11, achieving pre-clamping before flanging.

[0034] In this embodiment, the upper end face of the die 21 is provided with a forming surface that matches the bottom contour of the connecting plate, which is used to cooperate with the punch 11 to complete the forming of the main body of the sheet metal. The die 21 and the punch 11 are arranged vertically and vertically to form a forming pair.

[0035] Preferably, an elastic support member is provided between the die cavity 21 and the lower die holder 2. The elastic support member can be a spring or a rubber pad. The elastic support member is used to push the die cavity 21 back to its original position after stamping. Furthermore, a stroke limiting structure (not shown in the figure) is also provided between the die cavity 21 and the lower die holder 2 to limit the downward distance of the die cavity 21 and ensure forming accuracy. Please refer to existing structures for the stroke limiting structure.

[0036] In summary, the working principle is as follows:

[0037] During stamping, the upper die holder 1 descends with the press slide, and the blank holder 31 contacts the edge of the sheet metal before the punch 11. Under the elastic force of the nitrogen spring 34, the sheet metal is pressed with a constant pressure. Then, as the upper die continues to descend, the sheet metal is slowly fed under the constraint of the blank holder 31. The feeding speed is controlled by the pressure of the nitrogen spring 34 and the friction of the blank holder 31. The punch 11 contacts the flanging insert 22 to complete the flanging of the sheet metal. When the upper die moves upward, the blank holder mechanism 3 floats up, and the nitrogen spring 34 returns to its original position, preparing for the next stamping.

[0038] It should be noted that, under the action of the nitrogen spring 34, the edge pressing block 31 always presses the edge of the sheet metal against the upper end face of the flanging block 22 until the flanging is completed.

[0039] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" 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 the present invention 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 the present invention.

[0040] In this 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, an electrical connection, or a connection that allows communication between them; 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, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0041] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A stamping die for flanging an automotive connecting plate, comprising an upper die base and a lower die base correspondingly arranged, wherein a punch is fixedly mounted on the lower end of the upper die base, and a die is movably connected to the lower die base, wherein a cavity for the connecting plate is formed between the punch and the die, and a flanging insert for flanging the connecting plate material is also fixedly mounted on the lower die base located outside the die, characterized in that, The upper mold base is movably connected to a pressing mechanism located outside the punch. The pressing mechanism includes a pressing block corresponding to the position of the flanging insert and a pressure source for providing downward elastic pressure to the pressing block. By controlling the pressure of the pressing block on the edge of the sheet metal, the feeding speed of the sheet metal is controlled, so that the edge of the sheet metal is fed into the inside of the flanging insert at a controlled speed under the pressure of the pressing block and is folded into shape.

2. The stamping die for flanging automotive connecting plates according to claim 1, characterized in that, The pressing insert is slidably connected to the upper mold base through multiple guide posts. The upper mold base has multiple guide holes that slide with the multiple guide posts. Several balance blocks are also fixed on the lower end face of the pressing insert. The pressure source is located between the upper mold base and the pressing insert.

3. The stamping die for flanging automotive connecting plates according to claim 2, characterized in that, The pressure source is a plurality of nitrogen springs with adjustable pressure. The plurality of nitrogen springs are spaced apart along the length of the pressing insert. The upper end of the nitrogen spring is fixed to the upper mold base, and its lower end is in contact with or fixedly connected to the upper end surface of the pressing insert.

4. The stamping die for flanging automotive connecting plates according to claim 1, characterized in that, An elastic support is provided between the die cavity and the lower die base.

5. The stamping die for flanging automotive connecting plates according to claim 2, characterized in that, The lower end face of the pressing insert is provided with a pressing surface that matches the profile of the flange edge of the sheet metal. The pressing surface is either curved or flat.

6. The stamping die for flanging automotive connecting plates according to claim 3, characterized in that, There is a height difference between the lower end face of the pressing insert and the lower end face of the punch. When the upper die holder is at the upper stop point, the lower end face of the pressing insert is lower than the lower end face of the punch.

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