발간논문

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Vol.38, No.12, 1670 ~ 1675, 2000
Title
Effect of Strain Hardening on the Die Corner Gap Formation during ECAP
서민홍Min Hong Seo,김형섭Hyoung Seop Kim,홍순익Sun Ig Hong
Abstract
A die internal corner gap is usually found during equal channel angular pressing(ECAP) of materials. The die corner gap as well as the channel angle determines the strain generated during ECAP. Finite element analysis using the DEFORM2D code is carried out in order to investigate the corner gap formation between the die and workpiece during the plane strain ECAP process. The comparison of the deformation and the corner gap formation behaviour between the strain hardening materials and the quasi-perfect materials was made. The mechanism of the corner gap formation is described in conjunction with the strain hardening behaviour and flow velocity of the workpiece in the deforming zone. The adjustment of the corner angle from the die corner angle to the workpiece is necessary for a better prediction of the strain during ECAP.
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