Question

The cylindrical copper pressure tank (shown in cross section) will be produced by deep drawing.

Tensile test data of the cold rolled sheet that will be used for the blanks provided the following

true width and thickness strains relative to the rolling direction

a) Assuming no change in volume or thickness from the initial blank to final product,

calculate the initial blank diameter.

b) What is the limiting draw ratio (LDR) for this material?

c) Assuming 80% of the maximum reduction is applied in each drawing/redrawing step,

determine how many steps are required. Indicate the cup diameter after each step.

d) If the required punch force for the first step is 1200 kN, what is the minimum ultimate

tensile strength (UTS) of the material?

[20 Marks] Question 2. The cylindrical copper pressure tank (shown in cross section l be produced by deep drawing Tensile test data of the cold rolled sheet that will be used for the blanks provided the following true width and thickness strains relative to the rolling direction. Direction w 0.0 4 mm 0.1 0.142 0.162 0° 0.227 0.081 45° 35 cn 90° 10 cm a) Assuming no change in volume or thickness from the initial blank to final product, calculate the initial blank diameter. b) What is the limiting draw ratio (LDR) for this material? c) Assuming 80% of the maximum reduction is applied in each drawing/redrawing step. determine how many steps are required. Indicate the cup diameter after each step. d) If the required punch force for the first step is 1200 kN, what is the minimum ultimate tensile strength (UTS) of the material?

Answer 1

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