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the Technology Interface/Spring 2008 Klein The casting was allowed to cool overnight before the flask was opened and the sand broken off of the part showing the rough casting which will become the juggling club mold. (Figure 25) VI MOLD FINISHING The aluminum casting as is it was removed from the sand was quite rough and has the sprue and riser/s still attached. However, a successful casting must have a good finish on the inside surface which will be used to produce the plastic part. The finishing process includes several steps: 1. Removing the sprue, gates and riser/s typically with a band saw. 2. Truing the parting line surface to produce a flat parting line between the mold halves to trap the powered plastic in the mold during rotation. 3. Filling and repairing any surface defects on the mold interior using suitable filler such as JB Weld which can handle the molding temperatures. (Figures 26 – 28) 4. Aligning the two mold halves to create a smooth parting line on the part, then drilling holes to connect the two halves in perfect alignment. (Figure 29) 5. Smoothing the rough edges of the casting. Page 8PDF Image | 12 mil Reinforced Polyethylene
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