2003 Fiscal Year Final Research Report Summary
High speed production method of wrought magnesium alloy sheets using semi-solid twin roll strip casting and its plastic characteristics in warm deep drawing
| Project/Area Number |
13650142
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
機械工作・生産工学
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| Research Institution | Oyama National College of Technology |
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Principal Investigator |
IZAWA Satoru Oyama National College of Technology, Mechanical Engineering Dept., Associate Professor, 機械工学科, 助教授 (00232223)
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| Co-Investigator(Kenkyū-buntansha) |
WATARI Hisaki Oyama National College of Technology, Mechanical Engineering Dept., Associate Professor, 機械工学科, 助教授 (90210971)
HAMANO Hidemitsu Shouwa Denko KK, R&D Center, Chief manager of R&D center, 技術本部・技術研究所, 主任研究員
HAGA Toshio Osaka Institute of Technology, Mechanical Engineering Dept, Associate Professor, 工学部・機械工学科, 助教授 (00212134)
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| Project Period (FY) |
2001 – 2003
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| Keywords | magnesium alloys / semi-solid / twin roll caster / cooling slope / capacitance method / solidification |
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| Research Abstract |
An experimental approach has been performed to ascertain the effectiveness of semi-solid roll strip casting of magnesium alloys using a twin roll caster. It has been recognized that semi-solid forming contributes to lightening the total product weight if semi-solid material produced by light metals can be used to replace conventional iron and steel products. However, the problems of utilizing magnesium alloys are still mainly related high manufacturing cost. This means that improved quality must be balanced by economic validity In this experiment, magnesium alloy AZ31, AZ91, AM50 and AM60 were used to determine which were appropriate for use in semi-solid roll strip casting. Temperature of the molten materials, roll speeds at upper and lower rolls, which could be changed independently, were varied to find an appropriate manufacturing condition. Effects of cooling and contact condition on possible forming were clarified in terms of contact condition between molten material and roll. Als
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o, microscopic observation of the crystals of the finished casting has been performed. It has been found that magnesium sheet with 2.5 to 4.0mm thickness could be produced at a speed of 25m/min. It also found that the hot rolled cast magnesium sheets produced by semi-solid manufacturing process could be used for plastic forming.
Warm deep drawability of magnesium alloy sheets that were hot-rolled after a semi-solid roll strip casting process was investigated to demonstrate the feasibility of roll strip casting of AZ31B magnesium alloy. The temperature of the molten magnesium, and the roll speeds were varied to find appropriate manufacturing conditions. Hot rolling and heat treatment conditions were changed to examine which condition would be appropriate for producing wrought magnesium alloys sheets. Microscopic observation of the crystals of the produced wrought magnesium alloys was performed. It has been found that a limiting drawing ratio of 2.7 was possible in the warm deep drawing process of the cast magnesium alloy sheets that were hot-rolled after a semi-solid roll strip casting process. Less
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Research Products
(24 results)
