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Deep drawing
Dr. Dmitri Kopeliovich
Deep drawing is a cold metal forming process, in which a flat metal blank is forced into a die cavity by hydraulically driven punch.
A cup-like cylindrical part, having the depth greater than its diameter, is formed as a result of deep drawing.
The process is presented in the picture:
Typical stages of a deep drawing process are as follows:
- shearing a blank (round rectangular or other shape);
- clamping the blank on the die;
- stretching the blank by the punch forcing it into the die cavity;
- returning the punch and removal the part from the die;
- trimming the excess blank.
The maximum amount of deformation occurs in the cup walls, deformation of the flange is lower, bottom region undergoes no deformation.
Deep drawing alloys should possess high ductility in order to withstand large amounts of deformation.
The following alloys are used in deep drawing process: pure copper, some aluminum alloys and pure aluminum, 70-30 brass, cupro-nickel, mild steels.
Car bodies, pans, cartridge cases, kitchen sinks, beverage cans, bullet envelopes and other cup-like parts are manufactured by deep drawing process.
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