| Abstract |
A series of experiment with were performed sheet by use of superplastic forming on AZ31B-O sheet of magnesium alloy. The strain of vertical plate rolling direction (flat-shaped plate short axis) and level of rolling direction (flat-shaped plate axis) of sheet studied in this work. The forming on fine-grain Mg alloy AZ31B thin sheet with a thickness of 0.6 mm at temperatures of 300℃and400℃. The pressure has been different strain rate to the pressurization profiles for the forming, respectively. The using of specimen deformation of two magnesium alloy AZ31B rolling direction with gas blow forming in the mold, then analyze of formability and thickness effect to temperature of forming at the specimen deformation. To the die-casting, press-forming and forging process of magnesium alloy forming technology, the other to find a new process of magnesium alloy. Now, die-casting of magnesium alloy is base industry, but the die-casting has a large human cost. Therefore, to avoid forming the Taiwan native alloy industry recession, the need to develop new alloy forming technology, the use of superplastic forming technology by the industry product demand. This study is a breakthrough of traditional superplastic forming ideas take time and resolve to press on the forming of magnesium alloys due to poor, but not a lot of use of traditional metal forming processes, the use of the concept of superplastic, the best time efficiency product forming cycle time, to meet the 3C products shell geometry-based. The results showed that temperature of 400℃ was higher than temperature of 300℃. The formability of level of rolling direction was better than vertical plate rolling direction in the 400℃. Decreases of thinness of sheet had increasing of the plastic deformation. At two environment temperatures of experimental set had a more uniform deformation. The overall study was good results, and reduced to surface processing cost after forming, and increases application of Mg alloy sheet in the products of market. The shell product thickness of distribution was special characteristic by gas blow forming, and demonstrated the advantages of superplastic forming, fully. |
