Transactions of Materials and Heat Treatment

Title：Influence of relative bending radius on contact stress peak of forming die

Authors： LI Wei WANG Cheng-yong LU Zhi-bing ZHANG Peng ZHANG He-ning

Unit： Hefei University of Technology

KeyWords： relative bending radius contact stress peak high strength steel neutral layer

ClassificationCode：TG385.2

year,vol(issue):pagenumber：2013,38(5):46-49

Abstract：

The dynamic contact stress especially the peak of contact stress is the main reason for the regional wear of high strength steel forming die. The most important factor that influences the peak of contact stress is the relative bending radius. By the stress analysis of wide sheet bending forming, the relation of relative bending radius and the principal stress at the direction of plate thickness was obtained. Qualitative analysis of the negative correlation between relative bending radius and contact stress of die fillet was carried out. With the finite element model of U-shaped bending, a series of relative bending radii corresponding to the peak contact stress curves were obtained and the peak curve characteristics and trend were analyzed. Through the fitting analysis, the second order polynomial relations of the maximum contact stress peak value and the relative bending radius were fitted. The equation can help engineers to predict the peaks of contact stress and to choose mold material.

Funds：

教育部科学研究重大项目（311025）；国家基金面上项目（51275146）；安徽省自然科学基金资助项目(1208085ME71)；省部级重点实验室项目（2010SJSY0210）

李伟（1988-），男，硕士研究生

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