Principle of Asymmetric Crank Mechanism of

New-type Rolling Shear

HUANG Qingxue^{1, 2}  MA Lifeng^{2, 1}  LI Jinbao²  WANG Jianmei^{1, 2}  ZHANG Qisheng³  ZHAO Chunjiang¹

(1. College of Material Science and Engineering, Taiyuan University of Science and Technology, Taiyuan 030024;
2. School of Mechanical Engineering, Taiyuan University of Technology, Taiyuan 030024;
3. Hebei Tangshan Steel and Iron Co., Ltd., Tangshan 063000)

Abstract: Based on rolling-cut simulation, a 3 000 mm single-shaft, double-eccentricity and cut-to-length rolling shear of a certain large-scale iron & steel company that adopts asymmetric new-type structure is used as the calculation model by establishing motion path equation of spatial shear mechanism. After comparing and analyzing the shear force on steel plates with asymmetric front and rear, connecting rod force, and horizontal force component of connecting rod, the asymmetric formula is deduced. The asymmetric crank structure can decrease the horizontal force component of connecting rod during rolling-cut process, increase the effective drive force of connecting rod at the period of the maximum shear force, and decrease the extrusion of blade arc on steel plate edge as well. Theoretical analysis results and on-spot steel plate shear quality show that the asymmetric structure is an important means to improve shear capability, decrease blade wear, prolong blade life and improve shear quality.

Key words: Rolling shear  Asymmetry  Shear capability  Shear quality

CLC No: TG333

国家自然科学基金(50575155)、新世纪人才支持计划(NECT-05-0268)、山西省科技攻关(2006031174)、山西省科技成果推广(2007071071)和山西省知识产权局专利推广(071006)资助项目. Received 20070515, received in revised form 20071203

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