中文摘要：

建立滚切剪空间剪切机构运动轨迹方程，在滚切模拟基础上，以采用非对称新型结构的某大型钢铁有限公司3000mm单轴双偏心定尺滚切剪为计算模型，对非对称前后的钢板剪切力、连杆力、连杆水平分力进行分析对比，并推导非对称公式。非对称曲柄结构能够降低滚切过程中的连杆水平分力，增大最大剪切力时刻连杆的有效驱动力，降低刀弧对钢板刃口的挤压。理论分析结果及现场钢板剪切质量表明：非对称结构是提高剪切机剪切能力、降低剪刃磨损、提高刀片寿命、提高剪切质量的重要手段。

英文摘要：

Based on rolling-cut simulation, a 3 000 mm single-shaR, 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. ARer 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.