Drawing die for door opening of outer plate of side wall of vehicle

Abstract

The utility model discloses a drawing die for a door opening of a side wall outer plate of a vehicle, which comprises a female die, a male die, a blank holder and a lower die holder, and at least partial area of the material pressing surface of the female die is arranged to be a resistance structure for increasing resistance in the plate flowing direction of the door opening area of the outer plate of the side wall of the vehicle. Due to the fact that one of the main reasons of cracking of a door opening area is that the flowing speed of a plate material in different directions is too high, the cracking can be expanded into a longitudinal tearing crack from the weakest area of the edge, and a resistance structure is arranged on at least part of the area of the material pressing face (such as the local area of the material pressing face corresponding to the inner ring of the vehicle side wall door opening). Therefore, resistance is increased in the plate flowing direction of the vehicle side wall outer plate door opening area, the plate flowing speed of the area is slowed down, the forming process is more stable, the feeding state of the position is improved on the premise that overall feeding is not affected, and cracking of the edge of the side wall door opening and a waste area of the side wall door opening is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of vehicle manufacturing, in particular to a drawing die for a door opening of a vehicle side outer panel. Background Art

[0002] In vehicle processing technology, the aluminum alloy side panel outer panel is large in size, complex in shape and deep, and is very easy to crack during the forming process, especially in the inner area of ​​the door opening, where there are more matches and deeper steps. Edge cracking of the inner circle of the door opening is one of the common problems in the vehicle side panel drawing process. During the synchronous engineering stage of the side panel, the quality of the edge of the side panel door opening area can be evaluated from the aspects of inflow, thinning, principal strain, boundary cracking, maximum failure, etc., so as to minimize the risk of cracking in this area. After entering the production stage, optimization will be carried out from the aspects of the gap between the pressing surfaces and the quality of the sheet edge. However, during the forming process of the vehicle side panel door opening, the flow direction of the sheet is perpendicular to the edge of the material. Especially in the corner area, the sheet will flow in two different directions and is more sensitive to the resistance during the drawing process. When burrs appear on the edge of the sheet or the cross-sectional quality fluctuates, it may cause cracks in the edge of the door opening area. This type of cracking is common in the waste area at the edge of the side panel door opening. The cracks are not easy to be found after the waste is cut off. When the cracks in the waste area at the edge of the side panel door opening are severe, the cracks will extend to the product itself, causing batch scrapping of parts.

[0003] Therefore, how to effectively reduce the cracking at the edge of the door opening area during the door opening forming process of the vehicle side outer panel is a problem that needs to be solved. Utility Model Content

[0004] The utility model provides a drawing die for a door opening of a vehicle side outer panel, so as to solve the problem that the edge of the inner circle area of ​​the door opening is prone to cracking during the existing vehicle side outer panel door opening forming process.

[0005] In order to solve the above technical problems, according to one aspect of the utility model, a drawing die for a door opening of a vehicle side outer panel is provided, and the drawing die for the door opening of a vehicle side outer panel comprises: a die, a punch, a pressure ring and a lower die seat, wherein at least a part of the pressing surface of the die is configured as a resistance structure for increasing the resistance to the flow direction of the sheet metal in the door opening area of ​​the vehicle side outer panel.

[0006] In some embodiments, the resistance structure is a slope structure, and the slope of the slope structure increases along the flow direction of the sheet material.

[0007] In some embodiments, the slope structure starts from a sheet material end line and ends at a sheet material start line.

[0008] In some embodiments, the angle of the slope structure is 15 degrees.

[0009] In some embodiments, the slope structure smoothly transitions to the non-slope region of the binder surface.

[0010] In some embodiments, the resistance structure is distributed in an annular pressing surface area corresponding to the circumference of the door opening area of ​​the vehicle side outer panel.

[0011] In some embodiments, the resistance provided by the resistance structure at the corners of the door opening area of ​​the vehicle side outer panel is greater than the resistance provided at non-corners.

[0012] In some embodiments, the resistance structure is distributed in a pressing surface area corresponding to a corner of a door opening area of ​​the vehicle side outer panel.

[0013] In some embodiments, the resistance structure is a step-shaped structure that rises along the flow direction of the sheet material.

[0014] In some embodiments, the resistance structure is a curved structure that rises along the flow direction of the sheet material.

[0015] Compared with the prior art, the utility model has the following advantages:

[0016] The drawing die for the door opening of the vehicle side outer panel provided by the utility model comprises: a concave die, a convex die, a pressure ring and a lower die seat, wherein at least a part of the pressing surface of the concave die is set as a resistance structure to increase resistance to the flow direction of the sheet material in the door opening area of ​​the vehicle side outer panel. Since one of the main reasons for cracking in the door opening area is that the sheet material flows too fast in different directions, the cracking will start from the weakest area of ​​the edge and expand into a longitudinal tearing crack. The utility model sets a resistance structure on at least a part of the pressing surface (for example, a local area of ​​the pressing surface corresponding to the inner circle of the vehicle side door opening) to increase resistance to the flow direction of the sheet material in the door opening area of ​​the vehicle side outer panel, so as to slow down the flow speed of the sheet material in this area, make its forming process more stable, improve the feeding state of this area without affecting the overall material flow, and avoid cracking at the edge of the side door opening and its waste area. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the structure of the concave mold provided in an embodiment of the present application;

[0018] Figure 2 is a partial cross-sectional schematic diagram of a concave mold provided in an embodiment of the present application;

[0019] Figure 3 is a schematic diagram of a resistance structure provided in an embodiment of the present application;

[0020] Figure 4 It is a schematic diagram of a sheet material starting line and a sheet material ending line provided in an embodiment of the present application;

[0021] Notes on the attached drawings:

[0022] Concave die 1, resistance structure 10 DETAILED DESCRIPTION

[0023] Many specific details are described in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific implementation disclosed below.

[0024] In the field of vehicle manufacturing technology, in order to solve the problem that the edge of the inner circle area of ​​the door opening is prone to cracking during the existing vehicle side panel door opening forming process, the present application embodiment provides a drawing die for the vehicle side panel door opening. Please refer to Figure 1-Figure 4 To understand this embodiment, Figure 1 It is a schematic diagram of the structure of the concave mold provided in an embodiment of the present application; Figure 2 is a partial cross-sectional schematic diagram of a concave mold provided in an embodiment of the present application;

[0025] Figure 3 is a schematic diagram of a resistance structure provided in an embodiment of the present application; Figure 4 It is a schematic diagram of the sheet material starting line and the sheet material ending line provided in the embodiment of the present application.

[0026] The main structure of the drawing die for the door opening of the vehicle side outer panel provided in this embodiment includes a die, a punch, a pressure ring and a lower die seat. The processing procedures for the vehicle side outer panel after blanking include drawing, trimming, punching, side repair, side flipping, shaping, etc. Drawing, as the first process, is one of the important forming processes, which has a decisive influence on the quality and rebound size of the product. When entering the drawing process, the sheet is placed on the pressing surface of the die, and the punch moves downward with the press. The pressure ring and the die press the sheet tightly. After the drawing starts, the force of the punch and the resistance on the pressing surface jointly form the deformation force of the sheet, causing the sheet to undergo plastic deformation and completing the drawing process. The pressing surface is usually in a smooth and stretched shape to avoid wrinkles and creases during the forming process and ensure the quality of the drawn parts. In this embodiment, Figure 1-Figure 4As shown, at least a portion of the pressing surface of the die 1 is provided with a resistance structure 10 for increasing the resistance to the flow direction of the sheet metal in the door opening area of ​​the vehicle side outer panel. One of the main reasons for the cracking in the door opening area is that the sheet metal flows too fast in different directions, which causes the cracking to start from the weakest area at the edge and expand into a longitudinal tear crack. In this embodiment, at least a portion of the pressing surface (for example, a local area of ​​the pressing surface corresponding to the inner circle of the vehicle side door opening) is provided with a resistance structure 10, so as to increase the resistance to the flow direction of the sheet metal in the door opening area of ​​the vehicle side outer panel, so as to slow down the flow speed of the sheet metal in this area, make the forming process more stable, improve the feeding state here without affecting the overall material feeding, and avoid cracking at the edge of the side door opening and its waste area.

[0027] like Figure 3 As shown, in this embodiment, the resistance structure 10 is a slope structure, the slope of which rises along the flow direction of the sheet material, and the slope structure starts at the sheet material end line and ends at the sheet material start line (such as Figure 4 As shown, C1 is the starting line of the sheet material, and C2 is the ending line of the sheet material). In this embodiment, the angle of the slope structure is preferably 15 degrees, and the slope structure smoothly transitions with the non-slope area of ​​the pressing surface.

[0028] like Figure 1-Figure 3 As shown, in this embodiment, the resistance structure 10 is distributed in the annular pressing surface area corresponding to the circumference of the door opening area of ​​the vehicle side outer panel, that is, the resistance structure 10 provides the same resistance to the sheet material flow direction around the door opening area of ​​the vehicle side outer panel.

[0029] In another embodiment, since the sheet material in the corner area will flow in two different directions, the corner area in the door opening is more prone to cracking due to the anisotropy of the material flow. Therefore, the resistance provided by the resistance structure at the corners of the door opening area of ​​the vehicle side outer panel can be greater than the resistance provided at the non-corner area. For example, the slope of the inclined slope at the corner is greater than the slope of the inclined slope in the non-corner area, or the resistance structure 10 is only distributed in the pressing surface area corresponding to the corners of the door opening area of ​​the vehicle side outer panel.

[0030] It should be noted that, in addition to the above-mentioned slope structure, the resistance structure can also be set to other shapes that can increase resistance to the flow direction of the sheet material, such as a step-shaped structure rising along the flow direction of the sheet material or a curved surface structure rising along the flow direction of the sheet material.

[0031] The present embodiment provides a drawing die for a door opening of a vehicle side panel, and at least a portion of the pressing surface of the die is configured as a resistance structure to increase resistance to the flow direction of the sheet metal in the door opening area of ​​the vehicle side panel. One of the main reasons for cracking in the door opening area is that the sheet metal flows too fast in different directions, which causes the cracking to start from the weakest area on the edge and expand into a longitudinal tear crack. The present embodiment sets a resistance structure on at least a portion of the pressing surface (for example, a local area of ​​the pressing surface corresponding to the inner circle of the vehicle side panel door opening) to increase resistance to the flow direction of the sheet metal in the door opening area of ​​the vehicle side panel, so as to slow down the flow speed of the sheet metal in this area, make the forming process more stable, and improve the feeding state here without affecting the overall material feeding, so as to avoid cracking at the edge of the side panel door opening and its waste area.

[0032] It should be noted that although the utility model is disclosed as above in the form of a preferred embodiment, it is not intended to limit the utility model. Any technical personnel in this field may make possible changes and modifications without departing from the spirit and scope of the utility model. Therefore, the scope of protection of the utility model shall be based on the scope defined by the claims of the utility model.

Claims

1. A drawing die for a vehicle side panel door opening, characterized in that: The drawing die includes: a die, a punch, a blank holder and a lower die seat, wherein the blank holder surface of the die is provided with a resistance structure for increasing the resistance to the flow direction of the sheet metal in the door opening area of ​​the vehicle side outer panel; the resistance structure is distributed in an annular blank holder surface area corresponding to the circumference of the door opening area of ​​the vehicle side outer panel, and the resistance provided by the resistance structure at the corners of the door opening area of ​​the vehicle side outer panel is greater than the resistance provided at non-corners; or, the resistance structure is distributed in the blank holder surface area corresponding to the corners of the door opening area of ​​the vehicle side outer panel.

2. The drawing die for the vehicle side outer panel door opening according to claim 1, characterized in that: The resistance structure is a slope structure, and the slope of the slope structure increases along the flow direction of the sheet material.

3. The drawing die for the vehicle side outer panel door opening according to claim 2, characterized in that: The slope structure starts from the sheet material end line and ends at the sheet material start line.

4. The drawing die for the vehicle side outer panel door opening according to claim 2 or 3, characterized in that: The angle of the slope structure is 15 degrees.

5. The drawing die for the vehicle side outer panel door opening according to claim 4, characterized in that: The slope structure smoothly transitions to the non-slope area of ​​the binder surface.

6. The drawing die for the vehicle side outer panel door opening according to claim 1, characterized in that: The resistance structure is a step-shaped structure that rises along the flow direction of the sheet material.

7. The drawing die for the vehicle side outer panel door opening according to claim 1, characterized in that: The resistance structure is a curved surface structure that rises along the flow direction of the sheet material.

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