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) You must determine which machine to use for your product, based upon these criteria:
. Injection pressure 15 KPST - ANY MACHINE
Shot volume (assume 15% scrap for runners and sprue in shot volume)
b) Clearly draw the mold pull direction in your own sketch or on one of the images, using
opposing arrows. (< >).
Shot volume - ( 1 15x ( 32 , 08 in 3 )
- 12.460 -
Volume = 32.08 cubic inches
= 361 892 in ?
7 Either BS 320 am R51 340
7 A projected = (1 2,46 in )
= 155 252 m'
-.100 THICKNESS TYPICAL
= 15 x10 psi ) (155: 25 212
23287 7 168
Dimensions in inches
= 1164.387 tins
B1 300 will
cost Not factor as
me sold ,
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- Summer '19