1. College of Mechanical Engineering, Ningbo University of Technology, Ningbo 315000, Zhejiang, China 2. Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University, Ministry of Education of China, Qinhuangdao 066004, Hebei, China 3. CISDI R&D Co., Ltd., Chongqing 401122, China
Principle of Multi-roller Straightening Process and Quantitative Resolutions of Straightening Strategies
1. College of Mechanical Engineering, Ningbo University of Technology, Ningbo 315000, Zhejiang, China 2. Key Laboratory of Advanced Forging and Stamping Technology and Science Yanshan University, Ministry of Education of China, Qinhuangdao 066004, Hebei, China 3. CISDI R&D Co., Ltd., Chongqing 401122, China
ժҪ The multi-roller straightening process of section steel is analyzed by the springback theory of small curvature plane bending. The theoretical analysis results prove the curvature unification in straightening process and clearly reveal the principle of the multi-roller straightening process. The principle can be described as: the initial curvatures are reduced by several times anti-bending; meanwhile the initial curvature differences are diminished and the residual curvatures are unified; finally, the member after curvature unification is straightened by the last anti-bending. With the plastic region ratios becoming larger, the initial curvatures are more easily unified in straightening process. Based on the plastic region ratios and the required number of roller systems for unifying the initial curvatures, the large deformation straightening strategy and the small deformation straightening strategy are redefined. The new definition provides an important theoretical basis for setting reliable reduction rules. Through the theoretical analysis results, a new straightener design philosophy is proposed to improve the straightening quality and further increase the adjustment precision as well as the flexibility of the last roller system. The adjustable end roller emerges as the times required, achieving a good effect in practical application.
Abstract��The multi-roller straightening process of section steel is analyzed by the springback theory of small curvature plane bending. The theoretical analysis results prove the curvature unification in straightening process and clearly reveal the principle of the multi-roller straightening process. The principle can be described as: the initial curvatures are reduced by several times anti-bending; meanwhile the initial curvature differences are diminished and the residual curvatures are unified; finally, the member after curvature unification is straightened by the last anti-bending. With the plastic region ratios becoming larger, the initial curvatures are more easily unified in straightening process. Based on the plastic region ratios and the required number of roller systems for unifying the initial curvatures, the large deformation straightening strategy and the small deformation straightening strategy are redefined. The new definition provides an important theoretical basis for setting reliable reduction rules. Through the theoretical analysis results, a new straightener design philosophy is proposed to improve the straightening quality and further increase the adjustment precision as well as the flexibility of the last roller system. The adjustable end roller emerges as the times required, achieving a good effect in practical application.
��������:National Natural Science Foundation of China
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E-mail: zhaojun@ysu.edu.cn
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Jing YIN,,Jun ZHAO,Shi-yan WANG,Xian-song WAN,Yue-lin LI. Principle of Multi-roller Straightening Process and Quantitative Resolutions of Straightening Strategies[J]. �й������ڿ���, 2014, 21(9): 823-829.
Jing YIN,,Jun ZHAO,Shi-yan WANG,Xian-song WAN,Yue-lin LI. Principle of Multi-roller Straightening Process and Quantitative Resolutions of Straightening Strategies. Chinese Journal of Iron and Steel, 2014, 21(9): 823-829.
2014, Vol. 21 
