针对剪刃为圆弧形的特点 ,对剪刃进行了微分处理。并利用弹塑性变形理论推导出了弧形剪刃的剪切力公式 ,同时采用曲线拟合的方法求出十几种钢在不同温度下 ,剪应力和相对切入深度的数值关系 ,用以计算在不同板厚、钢种、切入深度和温度条件下的剪切力 ,进而得出剪切力的变化脉动图。还对切头飞剪在剪切过程中的动能及启动、制动过程中的惯性力进行了定性的分析 ,绘出了力能参数脉动图 According to the characteristic that the cutting edge is arc-shaped, the cutting edge is differentiated. The formula of shear force of arc-shaped cutting edge is deduced by the theory of elastic-plastic deformation. The numerical relationship between the shear stress and the relative depth of cut is obtained by the method of curve fitting. In different thickness, steel, cutting depth and temperature conditions of the shear force, and then come to shear changes in the pulsation diagram. The kinetic energy and start-up during the shearing of the flying shear of the cutter head and the inertial force during the braking process are also analyzed qualitatively, and the pulsation diagrams of the energy parameter pulsation