1. Easy to demould;

2. Mold expansion force (the product of plastic melt pressure on the projected area of cavity parting surface) is the mold expansion force. Simply put, the force of plastic melt to open the mold should be balanced;

3. The runner should be as short as possible to reduce the gate material, and the injection pressure can be easily transferred to the cavity.

Secondly, we should pay attention to the following points:

1, the overlap value is generally 1.2~ 1.5 times of the material thickness, and the width and step distance of the material strip should be as smooth as possible.

2. Selection of layout method

3. The layout specification should indicate the detailed work department name, width step, feeding direction, texture direction, punch tonnage and die closing height.

4. Calendering (texture) direction;

5. The direction of burr;

6. Pick up the knife;

7. Punch shape;

8. Material utilization rate;

9. Forming process;

10, blanking sequence

1 1, drill positioning holes first, from small to large, from inside to outside, and finally leave some empty working committees for plastic surgery.