直接押出ビレット表層の変形挙動に及ぼすビレット後端面潤滑条件の影響 Effect of back end lubricant conditions on billet skin behavior in direct extrusion
Study on metal flow in extrusion billet is fundamental and useful to understand extrusion technology. In particular, knowing the skin behavior of extrusion billet is indispensable to maintain qualities of extrusions. In order to investigate its behavior, the FE analysis by DEFORM-2D<sup>TM</sup> was performed. The billet skin was piled up at the back end of billet in direct extrusion. The skin behavior in single layer model analysis was similar to that of 2 layer model analysis. Therefore, single layer model analysis can investigate the skin behavior. Friction between billet back end and ram affected the behavior of billet skin. High lubricant accelerated thin skin 2.1% of billet diameter entering extrusion, but it constraint thick skin 6.4% of billet diameter entering extrusion.
軽金属 58(5), 189-193, 2008-05-30
The Japan Institute of Light Metals