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DROP FORGING - CLOSED DIE FORGING

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Closed die forging is when a component or part is ‘stamped’, through drop forging. It differs from open die forging, in that it requires a ‘closed die’, which is basically a two piece mould.
The procedure starts with a metal billet being heated to yellow heat and placed in the bottom die. The ram of the drop forge then presses the top die directly over the bottom die, pressurising the billet. The billet takes the shape of the two dies. A good example of this, is the spanner seen below. After stamping, there may be a need to ‘clean up’ the forged part, such as removing waste metal from the ‘seam’, where both parts of the mould / die meet, during stamping. All waste can be recycled at a later date.
 
 
 
 
SAMPLE ‘CLOSED DIE’ FORGED COMPONENTS
 
 
 
 
A TYPICAL INDUSTRIAL DROP FORGE
 
 
 
 
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