抄録
A new production technique using multistage forging of watch part known as "crown" has been investigated. In the conventional forging process, the scratches on the shearing surface of the mother wire remain on the final products. The deformation behavior of the scratches during multistage forging has been analyzed using FEM and the experiment and a new manufacturing process for improved products is suggested. Carrying out additional forging with a conical punch in the conventional manufacturing process in order to accelerate the metal flow at the center of the sample is useful for obtaining improved final products.
