Ma Lifeng

Principle of Asymmetric Crank Mechanism of New-type Rolling Shear

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.