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 8000 psi 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. (< >).
b) Designate the proper
Volume = 32.08 cubic inches
machine to use, based
solely upon these three
criteria. Show your work
for full credit.
Shot volume (assume 15%
scrap for runners and
sprue in shot volume)
100 THICKNESS TYPICAL
Minimum machine cost
7 lijedim pressure: 10 K PSI - ANY
> shot Volume = ( 1. 15 ) ( 32. 08 in3 ) = 36, 892 in]
Dimensions in inches
- BS320 or BS 130 0
7 Aprojected = (12, 46 0) = 155, 252 in2
Filmp = (Pig ( A ) = (10 * 10 3 Psi )( 15 5, 25 2in2)- 155,3516 1bf
2000 lbf /ton
2020 1 24 mm
F clamp - 776. 258 tons
ON LY BS 1306
7 cost - with only one machine that works doesn'tmatter.
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- Summer '19