In this experiment, the alloys as follows are used; (a) zamak alloy, (b) tombasil, (c) yellowbrass, (d) lead brass, (e) No. 11 alloy (Sn-base alloy), (f) No. IX alloy (Al-ase alloy), Theposition and dimension of vent holes are changed and such casting conditions as casting pressure, temperatur e of die and casting temperature are varied. The author decides the best condition ofvent hole from this experiment.
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