Analysis of the Curving Phenomenon of Curved T-Shaped Product by the Upper Bound Analysis and the $ DEFORM^{TM}$-3D in Eccentric Extrusion

굽은 T形 제품의 편심압출가공에 대한 상계굽힘해석과$ DEFORM^{TM}$-3D에 의한 굽힘 해석 비교

The kinematically admissible velocity field is developed for the analysis of the curving of an eccentric extrusion. The curving of product in extrusion is caused by the difference of the linearly distributed longitudinal velocity on the cross-section of the workpiece at the dies exit. The result of the analysis show that the curvature of product increases with the increase in eccentricity of gravity center of the cross-section of the workpiece at the die entrance from that of the cross-section at the die exit. It also increase with the die land dimension. By the DEFORMTM-3D analysis, the curving of T-shaped product in extrusion is changed by the eccentricity, die land length and the friction constant. The result of the analysis by DEFORMTM-3D software shows that the curvature of circular shaped product increases with the eccentricity. The two analysis and one experiment show the curving phenomenon in eccentric extrusion process.