Analysis of three-dimensional plastic flow for extrusion of elliptic sections through continuous dies

곡면금형을 통한 타원형 형재의 압출에 대한 3차원 소성유동해석

A new kinematically admissible velocity field for a generalized three-dimensional flow is introduced, in which the flow is bounded by an analytic die-profile function. Then, by applying the upper-bound method th the velocity field, the flow patterns as the upper-bound method are obtained. Extrusion of elliptic sections from round billets is chosen as a computational example. Computation and experiments are carried out for work-hardening material such as aluminum alloy 2024. In order to visualize the plastic flow, the grid marking technique is employed. The theoretical predictions both in extrusion load and deformed pattern are in good agreement with the experimental data.

본 논문에서는 터어빈과 콤프레셔 블레이드의 정밀예비현상 및 캠 부품의 제 조에 사용되는 원형소재로부터의 타원형재의 압출에 대한 일반적인 해석방법을 제안할 것이다. 해석결과는 실제 가공경화재인 알루미늄합금(Al2024)의 압출실험을 수행하 여 타당성을 검토하도록 할 것이며 기존의 해석 및 실험결과와도 비교 논의하도록 하 겠다.