Unformatted text preview: ME 467
23. You are to make the product noted in the drawing below, using injection molding. The
material used is polystyrene, which has an injection molding pressure of between 10 kpsi to
You have 4 machines to choose from; the higher the model number, the higher the cost to use
the machine. The machine specs are summarized in the table on the next page. Only one
product is made in the mold at a time. You want to use the lowest cost machine possible.
a) Clearly draw your desired mold pull direction in your own sketch or on one of the
images, using opposing arrows. ( 7).
b) Designate the proper machine to use, based solely upon these three criteria. Show
your work for full credit.
Injection Pressure : 15, 000 PSF Any machine in list.
Shot volume (assume 15% scrap for runners and sprue in shot volume)
Minimum machine cost
Vshot = (15 , 5 2 in ? ) ( 1504100% ) = 17. 848in 3
Anymachine in list
$ 14.059 WCHES
Volume = 15.52 in^3
A projected = TI De
- (14, 04 9 in ) TT
A = 135, 238 in2
- (15 *10 (Psi ) ( 155, 237 13)
mold pull , or
= 11 64, 286 tons
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OnLy Largest Model: B51300...
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- Summer '19