大型铝合金铸件（轮圈）的半固态成形技术

Semi-solid Metal Forming of Large Aluminum Alloy Casting （Wheel）

半固态金属的组织及流变特性，早在1971年就被美国麻省理工学院（MIT）的Flemings教授所指导的研究团队，在进行实验时偶然间所发现。但半固态铝合金商业应用的产品，除了美国AEMP及瑞士Buhler公司分别拥有及发表铝轮圈的半固态成形技术之外，大部分仍停留在中小型铸件的生产。为了适应汽车轻量化需求，由作者的服务单位与（台湾）工业技术研究院所合组的研究团队，在历经约三年的合作，从半固态触变铸造（Thixocasting）的球化坯料（slug）、再加热技术至流变铸造（Rheocasting）的半固态浆料（Slurry），进行了多项实验，最终验证了半固态技术应用于大型铝合金铸件（轮囤）生产的可行性。自2005年起，使用A356合金材料改良流变铸造法及2700t的实时射控压铸机的生产线，成功产出汽车用大尺寸半固态铝轮圈，并获得较传统铸造为佳的力学性能，有效达成零部件轻量化需求。

The metallurgical structure and theology of semi-solid metal was discovered by MIT Professor Flemings and his research group accidently in 1971. However the commercial application of semi-solid aluminum alloy is only applied to small and medium castings except the report from AEMP in American and Buhler in Switzerland about the application to aluminum wheel. For light weight requirement of automobile, authors and Taiwan Industrial Technology Research Institute have jointly studied slug of thixocasting, reheating and slurry of rheocasting for 3 years. The feasibility of semi-solid forming for large aluminum casting, like wheel, is confirmed. From 2005, the improved rheocasting process with A356 alloy and 2 700 ton real time control die casting machine has been used to produce large size semi-solid aluminum wheel successfully. A better mechanical strength to conventional casting has been obtained to meet the requirements of light weight.