考虑加工残余应力的球头铣刀铣削力建模研究

Research on Modeling of Milling Force of Ball-end Milling Cutter Considering Machining Residual Stress

在难加工材料切削加工过程中,工件表面会产生加工残余应力,并在循环切削中不断地发生应力加载和释放,进而影响切削力。本文提出了一种考虑加工残余应力的球头铣刀铣削力模型。由于残余应力释放引起的工件变形会导致刀—工接触区域发生变化,通过残余应力测量试验,完成了应力释放引起变形的有限元仿真,以切削刃微元的位置角为参数建立了考虑加工残余应力的铣削力模型,通过试验验证了该铣削力预测模型的准确性。

During the cutting process of difficult-to-machine materials, machining residual stresses are generated on the surface of the workpiece, and stress loads and releases continue to occur during cyclic cutting, which in turn affects the size of the cutting force.Therefore, this paper proposes a milling force model for ball end mills considering machining residual stress.The deformation caused by the residual stress release will cause the contact area of the ball nose tool and the workpiece to change.Through the residual stress measurement experiment, the finite element simulation of the deformation caused by the stress release is completed, and then the position angle of the cutting edge element is used as a parameter.A milling force model considering the machining residual stress is established.The accuracy of the milling force prediction model is verified through the experiment.