热轧钢棒曲柄剪刀片参数优化

Crank Shear Knife Parameter Optimization for the Cutting of Hot Rolled Rod

针对热轧钢棒切头后头部局部塑性变形过大会影响下游轧机机架咬入的技术难题,拟从刚粘塑性力学基本方程分析剪刃宽度、刀尖角和刀片间隙三个刀片参数与热轧钢棒剪切后头部局部塑性变形规律,并以塌肩深度、切入深度和最大剪切力为热轧钢棒剪切后头部局部塑性变形的评估指标。采用有限元软件Deform-3D建立DIN C45热轧钢棒剪切过程有限元模型,进行仿真试验,分析多种刀片参数组合与塌肩深度、切入深度、最大剪切力值之间的关系,求解出刀片优化参数。采用该优化参数能够改善热轧钢棒切头后的头部局部塑性变形,降低头部局部塑性变形指标切入深度约40%。

Oversized head plastic deformation of hot rolled rod after its head cut affects the biting condition of downstream mill stand. For this problem, the relations between head plastic deformation and crank shear knife parameters such as knife edge width, knife edge angle, knife gap are analyzed according to the formulae of rigid-visco- plastic mechanics and collapse depth, invasion depth and maximum cutting force are chosen as evaluation index of head plastic deformation. Meanwhile, the cutting FEM Model of DIN CA5 hot rolled rod is established by deform-3D and used to simulate the value of collapse depth, invasion depth and maximum cutting force under the different knife parameter combinations in order to obtain the optimized knife parameters. The optimized parameters obtained can decrease head plastic deformation by decreasing nearly 40% of invasion depth.