부산대학교 도서관

In the present work, an attempt was made to predict the force evolution during the extrusion of 7075 aluminium alloy by means of 3D FEM computer simulation. For this purpose the general F.E.A. software Forge-3D has been used to set up the finite element model of the hot aluminium extrusion. 7075 Aluminium was used as billet material, with 30 mm diameter and 30 mm length. The extrusion process was modeled as isothermal, which means that the billet material was preheated at a specific temperature and then it was pressured into the circular die, with different extrusion ratio. The extrusion speed was varied from 2 to 6 mm/s and also the extrusion die angles varied. The friction between work piece and die, concerns concerns Tresca model with 0.3 friction factor . The influence of die angle, reduction ratio, ram speed, die temperature on the extrusion force during the extrusion process were investigated. Results show that die angle, ram speed, die land diameter has a significant influence on the extrusion force evolution. [ABSTRACT FROM AUTHOR]