Reasons for smaller or larger inner diameter of drawing parts

When the hardware stamping parts manufacturer is carrying out the stamping and stretching process, the inner diameter of the stamping and stretching parts obtained is too small or too large, resulting in unqualified products. What is the reason for this? Learn about it with Xiao Bian.

1. The inner diameter of the stamping stretching part is too small:

A. Insufficient output at the top;

B. The hydraulic oil temperature is too high or the hydraulic machine leaks oil;

C. The stretching material is too thick.

2. The inner diameter of the stretching piece is too large:

A. Excessive jacking force;

B. Wear of drawing die;

C. The material thickness of the stretching material is too thin.