鍛造型板厚大圧下による大ひずみ加工の基礎特性

— 鍛造型大圧下加工による微細粒鋼創製技術 I —

抄録

A high-speed large-reduction forging technology has been developed to improve the hot strip production process. This technology can be used to produce fine-grained steel by enhancing the dynamic recrystallization caused by high strain. And it has specific features in width deformation caused by intermittent and large deformation. In this paper, laboratory-scale experiments and FE analysis are carried out to clarify the fundamental characteristics of the deformation and stress field. Large reduction results in a large width spread, and intermittent working causes periodic width deviation. The influences of die shape, the amount of feed per pass and the aspect ratio of the width against the thickness of the initial works on width spread and deviation are discussed. Large forging load results in a chevron-like indentation profile of the die surface and produces a thickness profile of the work.