Study on Work Hardening Performance for Fine-Blanking with Negative Clearance Through Finite Element Analysis and Experiment
Based on the theory of elastic-plastic stress, the dynamic process of fine-blanking with negative clearance are simulated through the finite element analysis software DEFORM-2D, and the elasticplastic stress–strain field in the deformation zone of fine-blanking with negative clearance processing are analyzed. The analysis results show that the work hardening of blanking work pieces with negative clearance, which is irrelative with the stress distribution of shear surface, is caused by the colligate effect of stress–strain. The length of shear surface has great influence on the degree of work hardening. With the same blanking parameter, longer the shear surface length is, fiercer the friction and extrusion of deformation zone is, and stranger the degree of work hardening is. The time of the punch acting on shearing material shortens as the blanking velocity increases and the velocity of the plastic distortion accelerates. With the increment of blanking velocity and blanking temperature increasing, the increment of work hardening increases. The material crystal grain is staved more seriously if the deformation value with the shear zone material becomes bigger, so that the degree of work hardening is stronger, and the theoretical analysis is correct with experiment results.
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Document Type: Research Article
Publication date: September 1, 2012
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