| 摘要 |
<p>PURPOSE:To manufacture a thin and wide section hard to manufacture and to improve its operating efficincy by extruding it from a die having a specific extrusion-port. CONSTITUTION:The shape of an extrusion port 10' is formed by joining two slits 10'', 10''', having the same crosssectional shape as those of two pieces of sections 10, together into one body. That is, the slits 10'', 10''' having section shapes are unified into a single annular slit by joining them together at the slit edges through slits. The adequate joining slit-width at the joining part is about 0.1-0.4mm.. In manufacturing the sections, a heated Al-billet is extruded into a long-sized section, and its camber and twist, etc. are corrected by clamping its both ends. Next, the section is cut into a prescribed length and further, is charged into an artificially-aging heat-treating furnace, in which a hardening component in the base material is separated to increase its hardness by heating it at a fixed temperature for a fixed time.</p> |
