Comparison of surface roughness of drawbead on non symmetry deep drawing of sheet metal by using finite element simulation
This research aims to study the flow of sheet metal in non symmetry shape deep drawing process. The experiment used different surface roughness of drawbeads and then they were simulated by finite element method. The shape of drawbeads is semicircle with 3 levels of surface roughness--0.152 Ra, 0.963 Ra and 6.127 Ra. The material used was cold rolled steel SPCD (JIS) which was under the condition of using 50 percent of blank holder force from calculation. The results show that the surface roughness of drawbeads effect the flow of sheet metal. Drawbeads with high surface roughness results in increase of tare and wrinkle on workpiece. While those with low surface roughness results in no tare and less wrinkle. Finite element simulation and experiment show a coherent result in the behavior of non symmetry shape deep drawing process. Additionally, finite element simulation can show the area with tare and wrinkle of workpiece. The adaptation of finite element can effectively predict and provide a way to fix the flow of deep drawing process.
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