| 摘要 |
A long deformed extruded metallic shape which is obtained through such processes that a metallic material is extruded and deformed at the same time for higher efficiency of operation without subjecting a long metallic shaped material to after-working such as cutting and a metal flow of the extruded shape obtained is not cut, whereby a mechanical strength and fatigue strength of said extruded metallic shape is improved. When extruding a long metallic material by the extruder, a die provided with at least one device for varying a bore diameter thereof and actuated by a cylinder device is used so that an extruded metallic shape differing in cross-sectional shape along the longitudinal direction may be obtained by varying the bore diameter of the die properly during extrusion. |
