Metal flow behavior in extrusion of aluminum square-channel bar

• Published in: Journal of Japan Institute of Light Metals Vol. 44; no. 10; pp. 531 - 536
• Main Authors: XIE, Jian-Xin, MURAKAMI, Tadasu, IKEDA, Keisuke, NAGANAWA, Kenji
• Format: Journal Article
• Language: Japanese; English
• Published: Tokyo The Japan Institute of Light Metals 1994; Keikinzoku Gakkai, c/o Hibiya Asahi Seimeikan, Keikinzoku Kyokai
• Subjects: channel section; die design; extrusion; metal flow; profile
• ISSN: 0451-5994; 1880-8018
• DOI: 10.2464/jilm.44.531

Deformation behavior in the extrusion of a aluminum square-channel bar has been analyzed experimentally. 1070 aluminum, commercial pure lead and Pb-1.5mass%Sb alloy in which several fine aluminum (99.99%) wires were buried along the extrusion direction were used as working materials. Channels with a section 10mm wide, 10mm high and 1mm thick were extruded with a container of 30mm in diameter (extrusion ratio 25.5). 1070 aluminum was extruded at 400°C and others at room temperatures. Following results are obtained: (1) The extrusion load is affected little by the location of die exit. (2) As the bottom side of the channel departs from the center of die, the extrudate curves more heavily toward the open side of the channel. (3) Metal flow in extrusion of the channel bar consists of two steps. At the first step, the cross-sectional shape of plastic region changes from a circle (the section of container) to an ellipse and at the second, from the elliptic section to the shape of the die hole. Only the location of plastic region in sections changes with die hole location, its shape and dimension are hardly affected. (4) For the dies and subpress used in this work, the major axis and ellipticity of plastic region on the boundary between the first and second deformation steps are 13.8mm and 0.91-0.92, respectively.