A Study on the Plastic Flow for Porthole Extrusion with Mandrel

맨드렐이 있는 포트홀 압출의 소성유동에 관한 연구

In this study the plasic flow before welding stage in the cahamber is analyzed by FEM and experiments during the porthole extrusion process. The analysis is concerned with plastic flow in the port and welding chamber of rectangular hollow section extrusion through the porthole die with mandrell. Numerical simulation by finite element code to investigate the plastic flow is discussed for both tapered inlet and straight inlet chamber. To visualize the flow in extrusion process split dies and punches are designed and manufactred by wire EDM. Experiments are carried out by using the plasticine as a model material at room temperature. The theoretical predictions are reasonable agreements with experimental results in the welding lines and the deformed profiles.