考虑刀具偏摆的微铣削瞬时切削厚度的理论分析与研究

Theoretical analysis on cutting thickness considered for cutting tool running out in micro end milling process

为避免用圆弧线来描述微铣刀刀尖运动轨迹带来的误差,更精确地实现微铣削加工过程的模拟,引入刀尖运动的真实轨迹即次摆线,同时考虑微铣削加工过程中刀具偏摆的影响,通过数学的方法,建立一种新的瞬时切削厚度理论计算模型。研究刀具在旋转过程中,刀具偏摆和每齿进给量对微铣削瞬时切削厚度的影响。通过将几种切削厚度模型进行对比分析,考虑刀具偏摆的切削厚度模型更加接近真实情况。

In order to avoid the geometrical error caused by the circular path which describes the movement of the tool tip and to make the simulation of the milling procedure more exact, a new model for calculating the instantaneous cutting thickness model is established, considering the influence of the deflection of the cutting tool in the process of micro milling and the tip movement＇s trajectory trochoid. The influence of different cutting tool rotation angle and tool run-out and feed per tooth on instantaneous cutting thickness theory are also studied. Through comparing and analyzing several cutting thickness models, the proposed model shows a satisfactory agreement with the results obtained from cutting experiments.