深絞り容器壁部の板厚増加を伴う型鍛造 : 第1報, 壁部板厚増加の可否

抄録

The purpose of this research is to develop a new die forging process to form machine parts which satisfy the strength requirements like a gear or a spline. The major point of this new process is the feasibility of the increase in the thickness without buckling since the initial material shape for the new process is a thick sheet and an intermediate product before die forging is a drawn cup. The new process is composed of deep drawing, redrawing with ironing, ear-trimming, and final die forging. In the redrawing, intermediate second process, the outer profile is the same to that of the final product. In the final die forging the increase in the wall thickness of the drawn cup is promoted mainly by centripetal metal flOW. The feasibility of the new plastic forming process was confirmed through a series of experimental simulation with a final product that had a wavy cross-sectional profile. As a result of an experiment the increase in the wall thickness without severe buckling has been confirmed.