Method for producing forged crankshaft
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United States of America Patent
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Nov 5, 2019
Grant Date -
Mar 22, 2018
app pub date -
Dec 10, 2015
filing date -
Dec 10, 2014
priority date (Note) -
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status (Latency Note)
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Abstract
A method for producing a forged crankshaft includes a die forging step of forming a forged blank having a crankshaft shape by die forging, and a pressing step of pressing the forged blank by a first dies. The forged blank includes first excess portions attached to some or all of crank arms each incorporating a counterweight, each of the first excess portions protrudes from a side portion of the crank arm, in a region near a journal. In the pressing step, the first excess portions are deformed by the first dies such that each of the first excess portions bulges toward a pin. This facilitates the production of a forged crankshaft with a reduced weight and assured stiffness.
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