DFMA as Applied to the Swingline 747 Desktop ... - University of Utah
DFMA as Applied to the Swingline 747 Desktop ... - University of Utah
DFMA as Applied to the Swingline 747 Desktop ... - University of Utah
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Scrap percent:<br />
Plan area = 71.3 cm 2<br />
Plan area correction fac<strong>to</strong>r f1 w from Fig. 9.10<br />
f1 w = 1.75<br />
Assuming number <strong>of</strong> parts <strong>to</strong> be produced <strong>as</strong> 500,000<br />
hd = 21.31 mm from Equation (9.3)<br />
Now considering<br />
hd = 25 mm<br />
<strong>DFMA</strong> <strong>as</strong> <strong>Applied</strong> <strong>to</strong> <strong>the</strong> <strong>Swingline</strong> ® <strong>747</strong> Desk<strong>to</strong>p Stapler<br />
Die plate thickness correction fac<strong>to</strong>r from Equation (9.5) is<br />
fd = 0.5 +0.02* hd<br />
= 1<br />
Thus, <strong>to</strong>tal die manufacturing points are <strong>the</strong>refore<br />
Mp = fd*f1w*Mpo<br />
= 1*1.75*32<br />
= 56<br />
The estimated blanking die cost, <strong>as</strong>suming $40/hr for die making, is<br />
= Cds + Mp*40<br />
= 255 + 56*40<br />
= $2495.<br />
Area <strong>of</strong> each part is<br />
Ap = 51.52 cm 2<br />
Area <strong>of</strong> sheet used for each part is<br />
As = (15.5 + 0.204)*(4.6 + 0.204)<br />
= 75.44 cm 2<br />
Scrap % = (As – Ap)/As<br />
= .32<br />
= 32 %<br />
19
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