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Abstract：
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In order to judge the influences of the clearance between mandrel and tube on forming quality for JAC590Y high strength steel rectangular tube in 180° rotary-draw bending, the rotary-draw bending processes of JAC590Y high strength steel thin-walled rectangular tubes under four clearances between mandrel and tube were simulated respectively by software Dynaform, and the major distortion parameters of bent tubes were obtained under different clearances between mandrel and tube. The results show that when the clearance between mandrel and tube is in a certain range, the width extension of bent tube is little influenced by the clearance between mandrel and tube, and its mid-plane height reduction rate increases with the increasing of clearance between mandrel and tube. Furthermore, the maximum wall-thickness thinning rate of bent tube occurs at the corners between roof plate and two side plates in the cross-section close to the core farthest from the mandrel, and choosing larger clearance helps to reduce the maximum wall-thickness thinning rate of bent tube. Thus, in 180° rotary-draw bending of JAC590Y high strength steel thin-walled rectangular tube, the reasonable range of the clearance rate between mandrel and tube is 0.01-0.025.
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Funds：
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甘肃省高等学校研究生导师科研项目（1004-04）
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AuthorIntro：
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王翠竹（1992-），女，硕士研究生，E-mail：291055771@qq.com；通讯作者：牛卫中（1962-），男，硕士，教授，E-mail：nwz@mail.lzjtu.cn
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Reference：
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