Effect of Grain Size on Micro Square Deep Drawing of SUS304 Stainless Steel

• Main Authors: Han-Sheng Chen, 陳漢生
• Other Authors: Chao-Cheng Chang
• Format: Others
• Language: zh-TW
• Published: 2014
• Online Access: http://ndltd.ncl.edu.tw/handle/11217536938502515014

碩士 === 國立高雄應用科技大學 === 模具工程系碩士班 === 102 === The study investigated the grain size of the SUS 304 stainless steel on the micro square deep drawing. The stainless steel sheets with different thicknesses of 0.05, 0.1 and 0.2 mm were treated by annealing techniques to adjust the grain size and were used in the micro deep drawing process for producing the square cups with 3 mm side length. The study used a finite element package, DEFORM 3D, to simulate the micro square drawing process. According to the design rules from references, punch corner radius, punch section radius, die corner radius and die section radius were considered for the design of the drawing die. The dimensions of the sheet billet were determined by the references and predicted results to reduce the variation on the rim height. The study showed that the as-received sheet with smaller grain size led to the lightest load in both simulation and experiment. The predicted load curves had similar trends to experimental ones but the predicted values were lower than the measured ones. Moreover, the thickness variation of the draw cups increased as the grain size increased. However, the decrease in grain size resulted in lower values of surface roughness and smoother surfaces on the sides and corners of draw cups.