ME363
HW6
Fall 2010
Name
Due: 11/30/2010
1.
Rod stock is drawn through a die with an entrance angle of 12
°
.
The material is known to
strain harden according to
0.22
K
σ
ε
=
where K=45,000 psi.
The original diameter of the
wire is 0.50 in. and the final diameter is 0.35 in.
The coefficient of friction at the work-die
interface is 0.1.
(a)
Determine the drawing force required.
(b)
Determine the power to perform the operation if the exit velocity of the stock is 2 ft/sec.
2.
A blanking die is to be designed to blank the part shown in Figure 1.
The material is 5/32 in
thick 302 strainless steel.
Determine the force required to perform this blanking.
Figure 1. Blanking part geometry.
3.
A straight bead is being formed on a 2 mm thick aluminum sheet in a 20-mm diameter die as
shown in Figure 2.
Let Y=120 MPa and E=70 GPa.

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