| 摘要 |
In producing a long extruded metal article of miscellaneous shapes, no post-working such as cutting is applied to the shaped long metal billet but extrusion of the metal billet and formation of miscellaneous shapes of the extruded article are effected both at a time for efficient production of the article. Since the metal flow of the extruded article is not cut, the extruded article has improved mechanical strength, especially fatigue-resistant strength. In extruding a long metal billet with an extruder, a die equipped with at least one hole section-varying device capable of acting due to a cylinder device or the like is employed with suitably varying the hole section profile of the die during extrusion so that a long extruded metal article of miscellaneous shapes where the section profile of at least the lengthwise direction of it varies is obtained. |
