A Study on the Open Die Forging Preform Shape of Crank Throw for Large Ship Engines

선박용 크랭크스로우의 자유 단조 예비성형체 형상

A crank throw, which is one of the part of crankshaft for a large diesel engine, is manufactured by both closed die forging and open die forging. For the improvement of productivity the open die forging method is usually adopted to manufacture it these days. In case of the open die forging for the crank throw, a preform shape is very important because it seriously affects final dimensions of the product. The purpose of this study is to investigate affective factors of the preform to obtain a good shape of final product through simulation and the results are compared to downsized lead experiments.