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Sheet Metal Structure Design Principles

The manufacturability of sheet metal parts refers to the difficulty of parts in punchingbending and stretching. Good technology should ensure less material consumption, less number of processes, simple die structure, high service life and stable product quality. In general, the biggest impact on the manufacturability of sheet metal parts is the performance of materials, the geometry, size and accuracy requirements of parts. In order to fully consider the requirements and characteristics of processing technology in the structural design of thin plate members, several design criteria are recommended here.

1.Simple Shape Criterion

The simpler the geometry of the cutting surface, the more convenient and simple the cutting and blanking, the shorter the cutting path and the smaller the cutting amount. For example, straight lines are simpler than curves, circles are simpler than ellipses and other high-order curves, and regular graphics are simpler than irregular graphics.

2.Guidelines for Saving Raw Materials (configuration guidelines for punching parts)

Saving raw materials means reducing manufacturing costs. Bits and pieces of leftover materials are often treated as waste. Therefore, leftover materials should be reduced as much as possible in the design of thin plate components. The waste materials of punching and cutting shall be minimized to reduce the waste of materials. In particular, the effect is remarkable when cutting large quantities of components. The ways to reduce cutting corners are as follows:

1)Reduce the distance between two adjacent components.

2)Clever arrangement.

3)Take out the material at the large plane and use it for smaller components.

3.Criterion of Sufficient Strength and Stiffness

1)the bending edge with beveled edge shall avoid the deformation area

2)If the distance between the two holes is too small, cracks may occur during cutting.

The punching design of parts shall consider leaving appropriate hole edge distance and hole spacing to avoid punching crack. The minimum distance between the punching edge of the part and the shape is limited according to the shape of the part and the hole. When the punching edge is not parallel to the contour edge of the part, the minimum distance shall not be less than the material thickness T; When parallel, it shall not be less than 1.5T.

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