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Higher output and compactness is becoming the norm for low speed diesel engines. The gripping torque of shrink-fit on semi-build up crankshaft can be raised by taking advantage of its high yield point in new cast steel “Throw Grade 5”. Instead, large oversized shrink-fit might induce higher residual stress in the pin fillet or overheating might cause decrease in the cold rolling effect in the pin fillet for short stroke crankshaft.In this paper, a shrink-fit test of the actual crankthrow was carried out for a large oversized shrink-fit. It was accomplished without any decrease of the cold rolling effect in pin fillet. Finally, in order to confirm to safety stress analysis on the crankshaft of a large engine with Throw Grade 5 was made taking the residual stress due to shrink-fit and cold rolling into account.

Stress Assessment of Crankshaft of Low Speed Diesel Engines Considering Residual Stress in Manufacturing Process