Development of a continuous six-directions ECAE processing equipment

• Main Authors: Ho, Shen-Jung, 何昇融
• Other Authors: Hsu, Ray-Quan
• Format: Others
• Language: zh-TW
• Published: 2011
• Online Access: http://ndltd.ncl.edu.tw/handle/74968727350703810187

碩士 === 國立交通大學 === 機械工程學系 === 100 === Magnesium alloys are widely used in industrial fields because of its properties of light-weight and high strength. Due to the bad formability of the magnesium alloy at room-temperature, semi-solid forming process are often adopted as a method for fabrication of the alloys. To increase the formability of semi-solid forming billet, we use the ECAE (Equal Channel Angular Extrusion) process to achieve grain refinement of the magnesium alloy. Conventional ECAE have many disadvantages: First of all continuous extrusion is almost impossible in ECAE process; The temperature of the billet in the experiment isn’t constant and it takes too much time of the full ECAE process to carry out. In this research, we develop a continuous six-directions ECAE processing equipment. This equipment can perform the different routes and passes in six-directions continuously, without moving the die. Besides, we produced billets by continuous six-directions ECAE with different process time, and then apply these billet to semi-solid forming test. The result of the filling-rate shows that shorten the processing time of the ECAE will ceduce the formability load of the magnesium alloy in semi-solid state.