锻压技术

屈服强度对高强板矫平的影响

英文标题：Influence of yield strength on leveling for high-strength plate

作者：仲翔武凯孙宇张宏伟付维爱孔德文

分类号：G333 2+3；TG335 5+1

出版年,卷(期):页码：2022,47(5):89-95

摘要：

高强度钢板的强化特性明显，与普通板材相比更难矫平。为了解决上述问题，建立了高强板矫平仿真模型，模拟了不同屈服强度下高强板的矫平过程，采用有限元法分析了板材在矫平过程中的应力变化规律，以及屈服强度对矫平力、残余应力和平直度的影响。针对1150 MPa屈服强度的板材矫平效果很不理想的现象，提出了2道次矫平方案。仿真结果表明：高强板矫平过程中，纵向应力占据主导地位，而剪切应力可忽略不计；在大变形方案下，随着屈服强度的增加，板材边部的应力集中现象越严重，平直度越差；2道次矫平方案可以解决屈服强度为1150 MPa的超高强度钢板难以矫平的问题，同时也减少了板材残余应力，使应力分布更加均匀。

High-strength steel plate has obvious strengthening characteristics, which is more difficult to level compared with ordinary plate. Therefore, in order to solve the above problems, the leveling simulation model of high-strength plate was established, and the leveling process of high-strength plate with different yield strengths was simulated. Then, the stress variation law of the plate in the leveling process was analyzed by finite element method, and the influences of yield strength on leveling force, residual stress and flatness of high-strength plate were also analyzed. Furthermore, for the unsatisfactory leveling effect of plate with the yield strength of 1150 MPa, a two-pass leveling scheme was proposed. The simulation results show that in the leveling process of the high-strength plate, the longitudinal stress is dominant, while the shear stress can be ignored. Under the large deformation scheme, with the increasing of yield strength, the stress concentration phenomenon at the edge of plate becomes more serious, and the flatness becomes worse. Thus, the two-pass leveling scheme can solve the straightening problem of ultra-high strength steel plate with the yield strength of 1150 MPa, at the same time, it reduces the residual stress of plate and makes the stress distribution more uniform.

基金项目：

2018年度泰山英才领军人才项目

作者简介：仲翔（1996-），男，硕士研究生，E-mail：353895098@qq.com；通信作者：武凯（1972-），男，博士，教授，E-mail：wukai@mail.njust.edu.cn

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