Deep Drawing
Deep drawing forms flat sheet blanks into seamless cup-shaped, cylindrical or box-shaped parts by pulling the sheet into a die with a punch. It makes cans, shells, housings, sinks and pressure vessel ends in high volumes.
What it is
A blank holder controls the sheet while the punch draws it into the die cavity; deep parts need several draws with annealing between stages. The walls are seamless and relatively uniform.
The drawing ratio (blank to punch diameter) is limited, typically about 2 for the first draw, so deep parts are formed progressively.
Typical applications
- Motor and compressor shells
- Kitchen sinks and utensils
- Filter housings and cans
- Automotive and appliance parts
- Gas cylinder and vessel ends
Suitable materials
- Deep drawing steel (CRCA DD/EDD)
- Stainless steel 304
- Aluminium
- Brass and copper
Points to consider
- Use extra-deep-drawing grade material for demanding parts.
- Generous punch and die radii prevent tearing.
- Deep parts need multiple draws and possibly annealing.
- Earing on rims is trimmed afterwards.
Frequently asked questions
What is deep drawing?
Press forming a flat blank into a seamless hollow part by drawing it into a die with a punch.
How deep can parts be drawn?
Deeper parts are formed in several stages; each draw reduces diameter within the material's drawing ratio limit.
Which material is best for deep drawing?
Deep and extra-deep drawing steels, 304 stainless, aluminium, brass and copper.