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Relative movements between the billet and container require friction work, which - when compressing billets through conical dies, for example - is made easier by a film of lubricant.
The rest of the tap, which is slightly tapered, serves as a guide.
Tapering (reducing), when a material is pressed through a tapered die.
Forming takes place in the area below the blank holder as far as the tapered edge of the drawing die.