剪切刀具是钢筋剪切机的核心部件,是剪切机研究的重要部分.分析钢筋剪切过程中的弹、塑性变形及断裂机理,简述钢筋剪切时剪切力的理论计算公式,以某厂钢筋随动剪切机剪切刀具为参考,建立钢筋剪切有限元模型,对剪切过程进行动力学仿真,分析参数对剪切力的影响,并用实验验证仿真结果的正确性,得出如下结果:增大上、下切刀侧向间隙,剪切力先减小后增大,侧向间隙为01 mm时,剪切力最小;增大上切刀刀刃倾角,剪切力减小.研究结果可为剪切机刀具设计与实验设备的安装调试提供理论依据.%Cutter is an important part of steel bar cutting machine.The elastic-plastic deformation and fracture mechanism of steel bar are analyzed during cutting.Cutting formula is listed.Cutting model is found based on a factory's steel bar cutting machine.Dynamics simulation of cutting process is done, and parameters influence on cutting force are analyzed, and the reliability of simulation results is verified by experiments.A series of simulation results are obtained.Cutting force is decreasing first and then increasing with the increase of side gap between upper and lower cutter, and cutting force is the smallest when the distance is 0.1mm.Cutting force is decreasing with the cutting edge angle increase of upper cutter.The results provides theoretical basis for the cutting machine design and installation.
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