The primary and fundamental processes of stamping are blanking, punching, zigzag and drawing:

(1) blanking and punching blanking and punching are processes to separate the blank. Blanking and punching process is exactly the same, just for different purposes. During blanking, the separated part is the finished product, and the remaining periphery is the waste material; punching is to obtain the hole, the punched plate is the finished product, and the separated part is the waste material. Blanking and punching are collectively referred to as blanking. The punch and die of the blanking die have sharp edges, and there is a gap of 5% - 10% of the plate thickness between the punch and the die, so as to ensure the cut is neat and less burr.

(2) the twists and turns are to make the workpiece obtain various bending angles of different shapes. The operation part on the zigzag die that makes the workpiece zigzag shall have a proper fillet radius r to prevent the workpiece from cracking when zigzag, as shown in Figure 3-22.

(3) drawing: drawing is the processing process of making plate blank into cup-shaped or box shaped parts. The punch and die edge of the drawing die shall be rounded to prevent the workpiece from being pulled apart. The gap between punch and die should be a little larger than the thickness of sheet metal (generally 1.1-1.2 times the thickness of sheet metal), so as to reduce friction. In order to prevent wrinkles, the edge of the blank needs to be pressed by pressing plate (blank holder).

Sheet metal stamping is a kind of processing method to separate or deform sheet metal by using stamping die. In most cases, the sheet does not need to be heated, so it is also called cold stamping, also called cold stamping or stamping for short.

Article source: Zhongshan Jinlei Electronic Technology Co., Ltdhttp://www.jinleidj.com/