1. The shape of the bending parts should be as symmetrical as possible, and the bending radius should not be less than the minimum bending radius allowed by the material.

2. The curved side is too short and difficult to form, so the straight part of the curved side should be made H>2δ. If H is required to be very short, it is necessary to leave an appropriate margin to increase H, and then cut off the added metal after bending.

3. When bending parts with holes, in order to avoid the deformation of the holes.

The second is the requirements for deep drawing parts:

1. The shape of the drawing parts should be simple and symmetrical, and the depth should not be too large. In order to minimize the number of deep drawing, easy to form.

2. The fillet radius of the deep-drawn parts is not increased in the case of the process program. Otherwise, it will increase the number of deep drawing and shaping work, and also increase the number of molds, and it is easy to generate waste and increase costs.