塑性発熱を利用した自己昇温成形法の開発（圧縮試験による荷重低減効果の検証）

概要

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Plastic deformation energy is transformed into heat in about 90 percent. If heat generation by plastic deformation of work metal is applied to its temperature rising, deformation resistance can be reduced. We propose a new cold stamping technology characterized by using a die which has low thermal conductivity to apply heat generation by plastic deformation to uniform temperature rising of work metal. Our aim in this study is to achieve ecological and technical advantages such as energy saving, high formability and high form accuracy. In this report, the effect of die materials and deformation rate on deformation load was examined by compression tests on TW340 and SUS304. The following results were obtained: 1) Deformation load on TW340 and SUS304 using ZrO2 for the die is lower than using SKD11 for the die to make efficient use of heat generation by plastic deformation. 2) Deformation rate has optimum value related to thermometric conductivity of work metal.