1 0 0 0 OA 高速双ロールキャスターで作製したアルミニウム合金板にロール面が及ぼす影響
- 著者
- 山敷 拓也 羽賀 俊雄 熊井 真次 渡利 久規
- 出版者
- 一般社団法人 日本機械学会
- 雑誌
- 日本機械学会論文集A編 (ISSN:18848338)
- 巻号頁・発行日
- vol.79, no.804, pp.1156-1160, 2013 (Released:2013-08-25)
- 参考文献数
- 5
A vertical type high speed twin roll caster is able to cast an aluminum alloy strip directly from a molten metal that is poured between the rotating rolls. However defects such as small cracks and unsound thickness distribution of the cast strip occur at faster roll speed. They are related to the contact condition of the roll surface and the melt. In the present study, we used the grooved roll to eliminate the defects, and to save the cost at the same time. We experimented using several grooved rolls with different patterns. When the groove width was 0.45mm; depth 0.2mm; pitch 0.1mm and 1.0mm, stable casting was possible. The shape of bulge was formed on the cast strip surface by the grooved roll. As a result of the color check, the grooved roll could eliminate the small cracks. The surface condition of the strip was more sound using the grooved roll with the pitch of 0.1mm than that of 1.0mm. Stopping the rotated roll during the casting, we observed the contact condition between the melt and the roll, and confirmed how the bulge was formed. To cold-roll for strip with bulges was possible and the bulges was erased. To cast for the sound strip was possible by the vertical type high speed twin roll caster with grooved rolls.
It is necessary to reduce the weight of an automobile body for an environment. Aluminum alloy parts are adopted instead of steel parts to reduce the weight. A6061 is more economy than A6016 and A6022 used for an automobile at present. This study used A6061 instead of A6016 and A6022. Process of roll casting has several advantages, including rapid solidification and low running cost. Furthermore, recycled aluminum was economy. This study examined A6061+0.2%Fe as model of recycled aluminum alloy. Roll casting of A6061 and A6061+0.2%Fe were tried using an unequal diameter twin roll caster. The casting speed was 30m/min. Thickness of strips were 4.8mm of A6061 and 4.6mm of A6061+0.2%Fe. The strips were rolled down to 1.0mm by cold rolling. T4 heat treated strips was operated with deep drawing and 2.0 of LDR value could be attained. As a result, this process prevented deterioration of a mechanical property.