基于工件表面误差的薄壁件切削力系数计算

The Cutting-force Coefficient Computating of Thin-walled Workpiece Based on Workpiece Surface Errors

切削力系数是计算评估机床切削力的重要参数之一。在对薄壁零件加工过程中的受力以及弹性变形进行分析的基础上,建立了基于加工零件表面误差求解切削力系数的理论模型。根据受力平衡原理,将三坐标测量的工件表面误差分配为工件和刀具弹性变形引起的误差,通过MATLAB工具代入理论模型求解切削力系数。通过将模型预测的切削力与实测切削力进行比较,结果显示模型预测的切削力波形吻合,预测切削力接近实测切削力的平均值。

The cutting-force coefficient is one of the important parameters in assessing the cutting-force of machine. The force and the elastic deformation in the processing of thin-walled workpiece machining were analyzed, and the theoretical model based on cutting-force coefficient was established. According to the force balance principle, the workpiece surface errors measured by the three-coordinate measured machine were distributed to the elastic deformation of the workpiece and tool errors. The errors were brought into the theoretical model for solving the cutting force coefficients by MATLAB tools. And cutting force predicted by the model were compared with the cutting force measured. As a result, cutting force predicted by the model fit the waveform, and close to the average of the measured cutting force.