Precision Metal Stamping Parts Processing Hardware Stamping Parts

Precision Metal Stamping Parts Processing Hardware Stamping Parts

The ratio d/t of punching diameter to material thickness in stamping processing can reach the following values: 0.4 for hard steel, 0.35 for mild steel and brass, and 0.3 for aluminum.

When punching small holes on the plate, when the thickness of the material is greater than the diameter of the punch, the punching process is not a shearing process, but a process of extruding the material into the die through the punch. At the beginning of extrusion, a part of the punched scrap is compressed and squeezed into the surrounding area of ​​the hole, so the thickness of the punched scrap is generally smaller than the thickness of the raw material.

When punching small holes in stamping parts, due to the small diameter of the punching punch, if the punch is punched by ordinary methods, the small punch is easy to break, so try to improve the strength of the punch to prevent it from breaking and bending. The methods and things to pay attention to are:

1. The stripping plate doubles as a guide plate.

2. A small guide column guide sleeve is used between the guide plate and the fixed work plate, or it is directly connected with the large guide column guide sleeve.

3. The punch is retracted into the guide plate, and the distance between the guide plate and the punch fixing plate should not be too large.

4. The bilateral gap between the punch and the guide plate is smaller than the unilateral gap between the punch and the concave die.

5. The pressing force should be increased by 1.5 to 2 times compared with the simple stripping.

6. The guide plate is made of or inlaid with high hardness material, which is 20% to 30% thicker than usual.

7. The connection between the two guide posts passes through the workpiece pressure.

8. During multi-hole punching, the punch with a smaller diameter is one material thicker than the punch with a larger diameter.