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
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
Cost <strong>of</strong> piercing die:<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 />
Cds = $255, L = 138.75 mm = 13.875 cm, W = 39.5 mm = 3.95 cm<br />
The b<strong>as</strong>e manufacturing score from eq. (9.7) is<br />
Mpo = 23 + 0.03 LW<br />
= 24.64<br />
The number <strong>of</strong> hours required <strong>to</strong> manufacture <strong>the</strong> cus<strong>to</strong>m-punching element for <strong>the</strong><br />
nonstandard aperture is, from Eq. (9.8)<br />
Pp = 150.5 mm = 15.05 cm, Np = 3<br />
Mpc = 8 + 0.6 * Pp + 3 Np<br />
= 26.03<br />
The equipment manufacturing time for punches, die plate inserts is, from Eq. (9.9)<br />
Round holes<br />
K = 2, Np = 4, Nd = 1<br />
Mps = K*Np + 0.4 Nd<br />
= 8.4<br />
The estimated piercing die cost, <strong>as</strong>suming $40/h for die making, is<br />
Cost <strong>of</strong> bending die:<br />
= Cds + ( Mpo + Mpc + Mps )*40<br />
= $2617.8 = $2620<br />
Cds = $255, L = 155 mm = 15.5 cm, W = 46 mm = 4.6 cm, D = 1.7 cm<br />
B<strong>as</strong>ic die manufacturing score for bending<br />
Mpo = (18 + 0.023LW)*(0.9 + 0.02 D)<br />
= 18.34<br />
Additional point for bend length and multiple bends<br />
Lb = 26.225 cm, Nb = 3<br />
Mpn = 0.68 Lb + 5.8 Nb<br />
20
Change language