A technology for preventing cracking and wrinkling of the water-cutting position drop platform of the inner panel of the car door

Abstract

The invention provides a cracking and wrinkling preventing technology for a drop platform at a water cutting position of an inner plate of a car door, and belongs to the field of automobile covering part punching dies. The technology comprises the following steps of 1: constructing a first assisting surface and a second assisting surface, and outwards extending along the vertical wall surface of a product; 2: determining a supplementary vertical wall surface according to a maximum control point of the material utilization rate; 3: constructing a vertical circular corner which is connected with the supplementary vertical wall surface and the second assisting surface; 4: constructing upper circular corners among the first assisting surface, the second assisting surface, the supplementary vertical wall surface and the vertical circular corner; and 5: constructing a third assisting surface which outwards extends from the vertical wall surface, constructing a vertical convex circular corner at the part where the third assisting surface is connected with the supplementary vertical wall surface; and constructing concave circular corners between the second assisting surface and the vertical circular corner which are sequentially connected at the upper part and between the third assisting surface and the convex circular corner which are sequentially connected at the lower part. With the adoption of the technology, the risk of wrinkling is avoided; the vertical circular corner is smooth, so that the materials can conveniently flow in, and the risk of cracking is solved; and in addition, a small space is needed, so that the material utilization rate can be increased.

Description

technical field [0001] The invention belongs to the field of stamping dies for automobile cover parts, and in particular relates to an anti-cracking and wrinkling process for a water-cut position drop table of an inner panel of a car door. Background technique [0002] Due to the limitation of the body shape, the inner panel of the door is close to the water cut position, and the part has a sharp corner with a large surface drop and a small draft angle. The surface drop in this area will cause serious wrinkles on the drawn part during the stamping forming process; the small draft angle and the sharp corner position require more material for forming, and severe cracking during forming. This area belongs to the area where cracking and wrinkling exist at the same time. Solving the cracking will increase the risk of wrinkling, and solving the wrinkling will increase the risk of cracking. figure 1 shown. [0003] For the above features, during the stamping process, this area no...

AI Technical Summary

Problems solved by technology

Disadvantages: The risk of wrinkling will increase; during the production process, the wear of the mold and the change of the batch of steel blanks will result in poor production stability

Disadvantages: Possibility of approval of design change application; design change of product involves changes of other parts, delaying overall project progress

Disadvantages: the overall increase of the mold, the reduction of the utilization rate of the steel plate material, and the high production cost

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