熱連成FEMによる孔型圧延特性の評価

概要

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Workhardable materials like high speed tool steels and super alloys have low ductility and narrow range of temperature suitable for rolling. In the hot profiled rolling of these materials, prevention of cracking in roughing process is significant technique. Considering the strong temperature dependence of deformability, keeping surface of materials high temperature is essential. And relatively homogeneous deformation should be also required. Then thermal mechanical FEM simulations of typical 5 roll pass designs for roughing mill were promoted. The distribution of strain, history of temperature, and mean normal stress at free surface of rolled materials were evaluated. In the view point of surface temperature, square-oval-square method was pointed as the most recommended process. The validity of given results were verified in commercial mass production. The improvement of productivity is supported by the FEM simulation.
電気製鋼研究会の論文