Multiple choice

In the deep drawing of cups, blank show a tendency to wrinkle up around the periphery (flange). The most likely cause and remedy of the phenomenon are, respectively,

  1. buckling due to circumferential compression; Increase blank holder pressure

  2. high blank holder pressure and high friction; Reduce blank holder pressure and apply Iubricant

  3. high temperature causing increase in circumferential length; Apply coolant to blank

  4. buckling due to circumferential compression; decrease blank holder pressure
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A Correct answer
Explanation

Seamless cylinders and tubes can be made by hot drawing or cupping The thickness of the cup is reduced and its length increased by drawing it through a series of dies having reduced clearance between the die and the punch. Due to reduction in its thickness, blanks shows a tendency to wrinkle up around the periphery because of buckling due to circumferential compreession an due to this compression blank holder pressure increases

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