Influence of Stamping Process by Dynaform Simulation on the Surface Ridging of 17%Cr Ultra-pure Ferritic Stainless Steel
ZHANG Yuan1, LI Jingyuan1, FANG Zhi1, CHEN Yulai1,2
1 School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083; 2 Engineering Research Institute of USTB, University of Science and Technology Beijing, Beijing 100083
Abstract: The influence of equivalent strain and reduction ratio of stamping process on surface ridging of 17%Cr ultra-pure ferrite stainless steel were studied by combination of Dynaform software and experiment vertification. The results showed that stamping ridging of 17% Cr ultra-pure ferrite stainless steel was not generated at the initial stage, it was generated until a certain degree of deep drawing. The improvement ridging effect of 17%Cr ultra-pure ferrite stainless steel was not obvious, under the model of constant speed and acceleration speed for stamping process from 10-40 mm/min. Based on Dynaform finite element analysis, the improvement blank-holder force could enhance reduction ratio of deep drawing, which has no obvious effect on the equivalent strain. The reduction ratio and equivalent strain on cross section area was slightly different, and the value of reduction ratio was ranked in decreasing order: 45°＜0°＜90°, while the rule is opposite for equivalent strain. In addition, the intermediate annealing process can obviously improve the inside ridging of deep drawing parts when first drawing depth below the critical ridging in deep drawing depth, while the effect was limited for outside ridging.
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2017, Vol. 31 
