Method for producing forged crankshaft
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United States of America Patent
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Oct 15, 2019
Grant Date -
Mar 1, 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 die forging step of obtaining a forged blank with flash having a crankshaft shape, and a trimming step of removing the flash from the forged blank while nipping the forged blank with a pair of holding dies. In the 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. When the forged blank is nipped with the pair of holding dies, the first excess portion is deformed by the pair of holding dies to bulge toward an adjacent rough journal.
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