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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<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 />
So,<br />
Total force required = Fblanking + Fpunching + Fembossing + Fbendung<br />
= 64.25 KN<br />
= 65 KN<br />
From Table 9.3<br />
The space required for 4 die stations is,<br />
4*14.6 = 58.4<br />
From Table 9.8<br />
Appropriate press for 58.4 is 500 KN press force, $76/hr operating cost and<br />
speed <strong>of</strong> 90 strokes/min.<br />
The estimated cycle time per part is,<br />
t = 60/90 =0.67 sec<br />
Processing cost per part is<br />
Cp = (0.67/3600)*76*100 = 1.4 cents.<br />
2.4aii Sheet metal analysis for changed part:<br />
Cost <strong>of</strong> blanking die:<br />
Taking 50 mm <strong>to</strong>lerances on four sides<br />
Usable area = Au = 25.5*14.6 = 372.3 cm 2<br />
Cost <strong>of</strong> die set = Cds = 120 +0.36*Au = $ 255.<br />
Pr<strong>of</strong>ile complexity = Xp = P 2 /LW<br />
L = 155 mm = 15.5 cm W = 46 mm = 4.6cm P = 395.5 mm = 39.55 cm<br />
Therefore,<br />
Xp = 21.93<br />
Total die manufacturing points<br />
B<strong>as</strong>ic manufacturing points M po<br />
From Fig. 9.9<br />
M = 32<br />
po<br />
18
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