Process For Metal Stamping Parts
(1) The blanking and punching of precision metal stamping parts is the process of separating the blanks. The process of blanking and punching is exactly the same, but the use is different. When blanking, the separated part is the finished product, and the remaining periphery is waste; punching is to obtain the hole, the punched sheet is the finished product, and the separated part is waste. Blanking and punching are collectively referred to as punching. Both the punch and die of the blanking die have a sharp edge with a gap of 5%-10% between the punch and die to ensure that the cut is neat and less burr.
(2) Bending is to make the workpiece obtain various corners of different shapes. The working part of the bending die that bends the workpiece must have an appropriate fillet radius r to avoid cracking when the workpiece is bent.
(3) Drawing: Drawing is a process in which a flat blank is formed into a cup or box. The punch and die edges of the drawing die should be rounded to avoid cracking the workpiece. There should be a slightly larger gap between the punch and the die than the thickness of the sheet to reduce friction. In order to prevent wrinkles, the edges of the blanks are pressed by a press plate, which is a processing method that uses a die to separate or deform the sheets. Because in most cases the sheet does not need to be heated, it is also called cold stamping.