Defects in Deep Drawn Component

Q. In the deep drawing of cups, blanks 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 lubricant
3. High temperature causing increase in circumferential length; Apply coolant to blank
4. Buckling due to circumferential compression; decrease blank holder pressure

Q. Wrinkling is a common defect found is

1. Bent components
2. Deep drawn components
3. Embossed components
4. Blanked component

Q. Wall thickness of drawn cup is controlled by

1. Deep drawing
2. Reverse drawing
3. Redrawing
4. Ironing