Oil Hole Crack of Crankshaft During Induction Hardening
Problem Statement
Cracking at oil holes on pin and main bearing sections of crankshafts during induction hardening occurs due to thermal stress during spray quenching. The problem arises due to the angle of the hole and the nonuniform mass distribution.
CAD Model Shows the Location of Oil Hole. Schematic Plot Shows the Hole Angle to Bearing Section Surface. During Induction Heating, the Power Density Around the Hole Is Nonuniform.
Process Description
Temperature Distribution Showing Nonuniform Temperature Around Oil Hole.
Austenite Phase Fraction After Induction Heating for 3 seconds.
Benefits
Thanks to modeling, a process change solved the cracking problem that trial-and-error tests had not been able to do!
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