Deep Drawn metal forming is a process in which flat, sheet steel is formed into simple or more complex components.
A circle or disc of sheet metal is first blanked in the first station of the tool. Then the flat blank is cupped around the nose of a punch and pressed into a die to form a cup. During the drawing process, the metal is formed under pressure. Forces of tension (in the material wall) and compression (in the shell flange) are induced as the steel is stretched by the “nose” of the punch into the die. These forces tend to thin the shell wall and thicken the shell flange. Depending on the length to diameter ratio, several draws may be required to create the basic shape of the part. In the drawing process several stepped diameters may also be created in the part.
A wide variety of in-tool stations can be developed to provide additional features. These additional features may include: coining, bottom piercing, multiple side piercing, extruding, embossing, marking, burnishing, ironing, chamfering, flange forming, shaped flange trimming, beading, reverse drawing, and rib forming.