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Excessive blank holding force may lead to stretching of sheet metal instead of drawing it.

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in Casting-Forming-Welding II by (119k points)
Excessive blank holding force may lead to stretching of sheet metal instead of drawing it.

(a) True

(b) False

The question was asked in an interview.

I would like to ask this question from Deep Drawing in section Mechanical Working of Metals of Casting-Forming-Welding II

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The correct choice is (a) True

To explain: In deep drawing, if the blank holding force is too high, then the metal around the punch may start to stretch instead of being drawn. This can cause localized necking or diffuse necking, which basically depends on the sensitivity of strain rate, and lubrication, and geometry of punch. If the blank holding force decreases then it may cause free flow of metal into the die cavity.

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