Method of making a diesel-engine crankshaft
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United States of America Patent
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Jul 17, 2012
Grant Date -
May 27, 2010
app pub date -
Apr 14, 2008
filing date -
Apr 16, 2007
priority date (Note) -
In Force
status (Latency Note)
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Abstract
The invention relates to a method for producing a crankshaft, in special for diesel engines, wherein a crankshaft blank is produced from austempered ductile cast iron, the casting blank is subjected to heat treatment matched to the austempered ductile cast iron whereby the blank acquires high strength and hardness. According to the invention, surfaces which form bearing surfaces for connecting rods and shaft bearings are undersized before the ADI heat treatment. Following the heat treatment a coating is applied to the bearing surfaces, the layer thickness being matched to the undersize and dimensional deviations as a result of the heat treatment. The coated bearing surfaces are finally finish-machined to the finished size without the need of machining the bearing surfaces of the casting blank after the heat treatment.
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