Research on Precision Die Forging Utilizing Divided Flow : 4th Report, Influence of restricting a centripetal flow

概要

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In the proposed precision die forging utilizing divided flow^<(1)〜(3)>, the filling up of materials into die corner can be made more effective by suppressing an increase of the centripetal flow rate and by promoting an increase of the centrifugal one. In this research, the following is confirmed. When both the step height of a die and the size of the relief-hole diameter are chosen suitably, the working pressure required for a complete filling up becomes lower than that in the process utilizing the relief-hole principle without decreasing the product height. This suggests that a suitable restriction of the centripetal flow will be effective to improve the tool-life and save the material. The two step forging method proposed in the third report ^<(3)> is found to be a preferable one in the case of this flow restriction.
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