抄録
Recently, the development of aluminum car body which employs aluminium space-frame structure has been paid strong attention in terms of it's light weight as wel as safety preservation . In this study, a novel extrusion equipment, that uses a taper mandrel and four movable dies, was developed to obtain a smooth and valuable cross-section to omit the secondary process of aluminum space frame. By using this equipment, extrusion experiments of aluminum alloy are carried out, and variable shape square pipes with extrusion ratio of 2-10 are produced.
