Method for producing a forged crankshaft
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United States of America Patent
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Oct 2, 2018
Grant Date -
Sep 22, 2016
app pub date -
Nov 20, 2014
filing date -
Nov 21, 2013
priority date (Note) -
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Abstract
A method for producing a forged crankshaft includes a die forging step, a trimming step, and an excess projecting portion crushing step. The die forging step forms a finish forged blank with flash, the finish forged blank including a shape of the crankshaft, in which crank arms have excess projecting portions at outer peripheries of side portions thereof near a crank pin, the excess projecting portions projecting from the outer peripheries. The trimming step removes the flash from the finish forged blank formed in the die forging step. The excess projecting portion crushing step crushes the excess projecting portions of the crank arms by pressing the crankshaft using a pair of first dies, the crankshaft being obtained by removing the flash in the trimming step.
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