Journal of the Japan Society for Technology of Plasticity
Online ISSN : 1882-0166
Print ISSN : 0038-1586
ISSN-L : 0038-1586
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Consolidation of Voids in Open Die Forging Using Steel Ingot
―Operational Improvements Using Void Consolidation Parameter Q-value―
Atsushi KISHIMOTOTakefumi ARIKAWAYasunori KAGAWAHiroshi TAKAHARA
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2019 Volume 60 Issue 701 Pages 167-174

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Abstract

In the manufacturing process of large forged steel products, internal quality must be improved by introducing stress and strain. The effect of the forging pass schedule on the consolidation behavior of internal defects can be evaluated using consolidation parameter Q-value calculated from the hydrostatic stress and the equivalent strain. In this study, we performed the actual steel ingot test to clarify the consolidation behavior and threshold of Q-value. Subsequently, the effect of the void distribution on the Q-value was investigated. The density distributions of initial defects were determined by solidification simulation calculation and the change in density distribution with increasing Q-value was investigated by forging simulation. After conducting this preliminary study, we report the result of verifying void closure using a tool for actual forging process design.

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© 2019 The Japan Society for Technology of Plasticity
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