THE DEEP DRAW PROCESS

Deep Drawing is a process where a flat blank taken from a sheet metal strip is formed into a cylindrical part, either simple or complex in design. The material is placed over a die and is drawn by a punch into the die in several stages to form the desired part design.

The blank taken from the sheet metal strip is pressed with a punch into a die in the first draw station, called the cupping station. After the cupping station subsequent draws occur taking the part to its final design configuration. This is accomplished when the nose of the draw punch pulls the shell from the previous station into a die to further reduce the diameter which typically lengthens the part. When this occurs there is some thinning of the side wall toward the bottom of the part and thickening of the flange on the drawn shell. During this draw process, there can also be one or more step diameters created on the part. The part is always under the control of either the punch and die or the transfer fingers eliminating the need for springs or die cushions.