航空薄壁件铣削加工铣削力预测方法研究

Study on Prediction of Milling Force in Peripheral Milling of Thin-walled Workpiece

铣削加工中铣削力是导致加工变形的直接原因,而航空薄壁件加工中,加工变形是加工误差产生的主要因素。本文以航空薄壁件铣削加工过程的铣削力为研究对象,通过确定铣削力模型和切削系数参数,建立了刚性和考虑刀具工件变形耦合的柔性预测两种模型。在柔性模型中,采用预扭Timoshenko梁单元的刀具/工件独立建模的方法建立有限元模型,利用Python语言在通用有限元软件Abaqus下迭代求解。实验验证表明预测模型具有很高的准确性和有效性。

In the milling process, milling force is the direct reason of resulting in processing deformation. In the thin-walled workpiece milling process, processing deformation is the major factor of process errors. The milling force of thin-walled workpiece milling process was researched. The rigid model and considering deformation of workpiece and tool coupling flexible model were built by establishing cutting model and cutting coefficient parameters to predict the milling force. In the flexible model, the finite element model was built by introducing the tool and workpiece independent modeling of pre-twist Timoshenko beam element of the tool, then it was iteratively computed by using Python language in the general-purpose finite element software named Abaqus. Cutting experiments were provided, which indicated the accuracy and effectiveness of these two prediction models.