A Study of Die Design for Press Forging of Magnesium-Alloy Sheets
Date Issued
2004
Date
2004
Author(s)
Wang, Shao-Chun
DOI
zh-TW
Abstract
The superior properties of magnesium-alloy attracted attentions from the electronics industry recently. Although the principal manufacturing process of the magnesium-alloy products has been die casting, the press forging has considerable potential because of its competitive productivity and performance. So the press forging process of magnesium-alloys at elevated temperatures was studied in the present study by the finite element analysis and experiments.
In the press forging process, the heights of the side wall and the defects on the bottom of the boss called ”flow through phenomenon ” are critical issues. In order to examine the effect of process parameters on these issues, the finite element software DEFORM was employed to simulate the press forging processes. According to the results of simulations, the influence of important process parameters such as the features of parts, friction conditions, temperature, punch shape and the thickness of sheet are obtained. After obtaining the material flow pattern in press forging, a cell phone case is used to investigate the die design technologies in press forging process. A method for die designing is established in this study. The forming process is divided into two stages including perform and finishing. By the forming results, it shows that this forming process is useful to avoid ”flow through phenomenon ” and raise the heights of the side wall.
The analyzed results are also verified by experiments. The experimental results obtained in the present study show good agreement with simulations. Besides, different lubricants are tested. Lubricants graphite and MoS2 are suitable for the press forging of AZ magnesium-alloys at elevated temperature. The results of this study can be reference resources for related academic research and can also be used to develop related products for industry production.
Subjects
潤滑劑
鎂合金AZ31板材
模具設計
沖鍛成形
吸孔現象
3C產品外殼
有限元素法
Lubricant
AZ31 magnesium-alloy
Press forging
Finite element method
Flow through phenomenon
Cases of electronic products
Die design
Type
thesis