Research on the Material Flow in Sunken Forging Dies : 1st Report, Geometry of Deformation in the H-Shaped Section

概要

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The dimensional factors which affect the die filling are examined and reported in this paper. A plasticine is used as a model material and the square grid technique is employed to measure the dislacement. The components having H-shaped sections are tested as one of the typical geometries under a plane strain condition. It has been proved that an overall forging process is divided into five stages according to the mode of deformation which occurs in the regions joining the rim and the web where the mode appears to change markedly during the process. The sequence of these deformation modes is so important for improving the die-filling that it provides an approach to the optimum design of the die and to an estimation of the optimum volume of materal. The dimensional factor which relates closely to this sequence is the ratio of flash width to height.
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