Prediction method for shape drawing force considering redundant deformation
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초록
A prediction method for shape-drawing force was developed with the cross-section division method, which divides the cross-sections of the initial workpiece and final product into finite elements at small angles. Each divided element is assumed to undergo an axisymmetric drawing process. Wistreich’s equation, which considers redundant deformation by employing a redundant work factor, was applied to calculate the axisymmetric drawing force for each element. To evaluate the redundant work factor, which varies with the reduction ratio and half die angle, a regression equation between the redundant work factor and a geometric parameter associated with the die’s deformation zone was derived by performing a finite element (FE) analysis on a series of axisymmetric drawing processes. The validity of the proposed method was confirmed via FE analysis of various shape-drawing processes. The forming load predicted by the proposed method exhibited good agreement with the results of the FE analysis, with errors of approximately 10% or less.
Abstract
A prediction method for shape-drawing force was developed with the cross-section division method, which divides the cross-sections of the initial workpiece and final product into finite elements at small angles. Each divided element is assumed to undergo an axisymmetric drawing process. Wistreich’s equation, which considers redundant deformation by employing a redundant work factor, was applied to calculate the axisymmetric drawing force for each element. To evaluate the redundant work factor, which varies with the reduction ratio and half die angle, a regression equation between the redundant work factor and a geometric parameter associated with the die’s deformation zone was derived by performing a finite element (FE) analysis on a series of axisymmetric drawing processes. The validity of the proposed method was confirmed via FE analysis of various shape-drawing processes. The forming load predicted by the proposed method exhibited good agreement with the results of the FE analysis, with errors of approximately 10% or less.
참고문헌 (16)
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