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Sheet Metal Stamping: Blanks, Drawn Cans and Washers
Stamping turns coil into parts at press speed. The coil is uncoiled, straightened and fed into a press whose die cuts and shapes it: blanking cuts the outline, piercing punches holes, forming bends, drawing pulls a flat blank into a cup. A washer is one blank pierced in the middle. A drink can is a blank punched from stiff cold-rolled aluminium sheet (typically alloy 3104-H19 or 3004-H19), drawn into a cup about three inches across, then pushed through ironing rings that stretch and thin the wall. Its end is stamped separately from alloy 5182-H48 coil; a conversion press forms the rivet button, scores the opening and fits the tab.
Advanced
Seconds per part (industrial)
Instructions
1
1
Uncoil and straighten
Uncoil and straighten
The coil is set on an uncoiler and fed through straightening rolls into the press.
Materials for this step:
Aluminium Coil100 kg
Steel Coil100 kg2
2
Blank and pierce
Blank and pierce
In a progressive die each press stroke advances the strip one station: one station pierces holes, the next blanks the outline. Steel washers are made this way.
Tools needed:
Stamping Press
Progressive Die3
3
Draw cups
Draw cups
For cans, round blanks of aluminium are drawn into shallow cups.
Tools needed:
Stamping PressProgressive Die4
4
Redraw and iron
Redraw and iron
Each cup is pushed through ironing rings that lengthen and thin the wall; the base dome is formed at the same time.
Tools needed:
Stamping Press5
5
Trim, neck and flange
Trim, neck and flange
The ragged top is trimmed and the open end necked in and flanged to take the end.
Tools needed:
Stamping Press6
6
Stamp the ends
Stamp the ends
Shells are stamped from end-stock coil; a conversion press forms the rivet button, scores the opening and fits a tab formed from a separate strip.
Tools needed:
Stamping PressProgressive Die7
7
Inspect
Inspect
Parts are measured against the drawing; cans are checked for wall thickness and leaks.
Tools needed:
Digital Caliper 6-InchMaterials
2- 100 kgPlaceholder
- 100 kgPlaceholder
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