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Current:Home > News > Research and Application of Semi-solid Casting Technology of Magnesium Alloy

Research and Application of Semi-solid Casting Technology of Magnesium Alloy
2016-12-29
Research and Application of Semi-solid Casting Technology of Magnesium Alloy:
    Magnesium alloy semi-solid casting forming technology proposed and research status Magnesium alloy as a green environmental protection alloy, due to its own small density, high specific strength, specific rigidity, dimensional stability, good electromagnetic shielding and price stability, etc. As a substitute for aluminum, plastics and steel, casting methods such as high-low pressure casting, investment casting, lost foam casting, and permanent casting can be used to cast magnesium alloy castings of light weight, high strength, and complicated shapes, but they must be overheated to ensure The fluidity causes many insurmountable problems in production (such as magnesium alloy combustion). The magnesium alloy semi-solid casting forming technology provides the conditions for solving this problem. Semi-solid state refers to the two-phase state in which both the solid and liquid phases exist in the alloy. In the 1970s, research on semi-solid forming technology began.
    Semi-solid forming of magnesium alloys is a method of processing a metal or alloy into a final product at the solidus and liquidus temperature ranges. Magnesium alloy semi-solid forming temperature range. Due to the characteristics of this forming method, Europe, the United States, Japan, etc. have shown great interest in the research and development of semi-solid forming of magnesium alloys, and many semi-solid processes have also emerged. In October 1988, Dow Chemical announced the development of a semi-solid metal magnesium forming process that will enable the semi-solid metal magnesium forming technology to be commercialized. Thixomat, established in January 1990, exhibited the world's first commercial machine (Thixomolder) in April 1991. This technology is called thixomolding. Magnesium thixotropic casting is a new process for one-step forming the final product. This process does not use the melting process and the traditional casting process. It combines the traditional die casting technology with the plastic injection molding technology, thus eliminating the need for melting equipment and avoiding it. The risk of magnesium alloy melting can be used to solve the application problems of magnesium alloy that traditional die casting technology cannot solve. Germany's Miller H. and others believe that magnesium alloy semi-solid thixotropic casting is a new casting technology in the future.
Semi-solid forming technology is Rheocast, a new machine and new process developed by Cornell University for the disadvantages of other semi-solid manufacturing processes, and obtained US patent in 1996.
The Rheocast technology and equipment and processes developed and developed for the shortcomings of other semi-solid forming technologies must be further refined and are expected to rise in the 21st century and lead to new breakthroughs in magnesium alloy forming technology.
Compared with Japan and the United States, although China is one of the largest magnesium producing countries in the world, there is still a large gap between the research and application fields of SSP in China. Faced with the 21st century, China's scientific and technical workers must strengthen the SSP. The research and application of pre-formed materials and equipment advances the development of the magnesium alloy industry.
 


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