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METHOD FOR DRAWING FORMING LIMIT DIAGRAM FOR PRESS FORMING, CRACK PREDICTION METHOD, AND METHOD FOR MANUFACTURING PRESSED COMPONENTS
METHOD FOR DRAWING FORMING LIMIT DIAGRAM FOR PRESS FORMING, CRACK PREDICTION METHOD, AND METHOD FOR MANUFACTURING PRESSED COMPONENTS
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机译:冲压成形极限图的绘制方法,裂纹预测方法和制造冲压零件的方法
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摘要
A forming limit curve is obtained by subjecting a surface of a metal plate to be press-formed to marking at a distance between reference points of 0.5-1.0 mm, bulging the metal plate with a punch having a top minimum curvature radius of 3-10 mm and measuring principal maximum strain and principal minimum strain at a time of generating cracks on the surface of the metal plate at a top portion of the punch from a change of the marking, from which a forming limit diagram is prepared and a crack generation is predicted in the press forming based on the forming limit diagram, and then the press forming is conducted under conditions not causing crack generation.
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