A large build-up-type crankshaft, used in diesel engines for low-speed vessels, consists of eccentric parts called "crank throws" and shaft parts called "journals," each part being fabricated separately and then assembled into the crankshaft. Large crank throws are generally formed by a method called foldforging. Fold-forging has the advantage of being able to press large-sized throws with a relatively small forging load; however, it suffers from low material yield due to large, unwanted cutting stock required for removing overlapping defects generated during the forging process. This study, based on experiments and numerical simulations, aims at developing an improved forging process that can both prevent defects and reduce cost.
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