System and method for molding a plastic gear suppressing shrinkage
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United States of America Patent
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Jun 10, 2003
Issued Date -
N/A
app pub date -
Nov 29, 2000
filing date -
Dec 29, 1997
priority date (Note) -
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Abstract
A gear molding method for molding a plurality of plastic gears having a different number of ribs without changing costly gates uses a mold having a prescribed gear shape including a prescribed number of grooves substantially radially arranged in the mold. A prescribed number of gates is provided for pouring molten plastic into the mold. When a plastic gear is molded and separated from the mold, a prescribed number of grooves are additionally cut at a middle angular position between each of the pair of neighboring grooves without changing the gates. Then, another gear having increased number of ribs is molded using the same gates.
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