Method for producing forged crankshaft
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United States of America Patent
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Sep 17, 2019
Grant Date -
Apr 26, 2018
app pub date -
Mar 31, 2016
filing date -
Apr 3, 2015
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
The disclosed production method includes a rough forging step of performing die forging to obtain a rough forged blank with flash having a crankshaft shape, and a finish forging step of applying die forging by use of a first pair of dies to the rough forged blank to obtain a finish forged blank with flash. In the rough forged blank, at least one of the rough crank arms have, in a region near an adjacent rough pin, a first excess portion protruding from an outer periphery of a side portion of the rough crank arm. During the die forging in the finish forging step, the first excess portion is deformed by the first pair of dies to bulge toward an adjacent rough journal.
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