A Study of Forging Process for AZ31B Magnesium Alloys of Shielding Case in Mobile Phone

• Main Authors: Chien-hsien Lin, 林建賢
• Other Authors: Jin–Bin Yang
• Format: Others
• Language: zh-TW
• Published: 2008
• Online Access: http://ndltd.ncl.edu.tw/handle/fn5346

碩士 === 國立高雄第一科技大學 === 機械與自動化工程所 === 96 === In recent years, the 3C product has been developing towards being light, thin, short and small. The Magnesium alloys has the properties of light weight, high strength to density to ratio, good ability in EMI, quick heat dissipation and is completely recyclable. Their characteristics are compatible to the international trend of light weight, energy effective and environmental friendly. Due to these reasons, Magnesium alloys is acquiring more market share and becoming the most potential material for 3C product. Today, the main manufacturing process of Magnesium alloys product is die casting. However, the thinner the material, the more difficult the process. The surface defects unavoidably would happen while reducing the thickness of the product to a certain level. When the product defectiveness rate increases, the overall cost goes up. The purpose of my study of forging process is to break bottlenecks in the existing process of die casting, and therefore to overcome the product In this article, AZ31B Magnesium alloys is utilized to study the forging process of shielding case in mobile phone. DEFORM, an analysis software,is used as design tool and can effectively check the parameters of each step in entire process. Entire process is consisted of pre-forging and master forging. Pre-forging is to distribute the material, during which lay aside the alloy in 430℃ oven and 300℃ of die temperature. Master forging is to stabilize the part shape, during which lay aside the alloy in 300℃ oven and 200℃ of die temperature. When doing mass production with these parameters, consistent part dimensions can be achieved.