考虑刀具偏心的五轴侧铣加工瞬时未变形切屑厚度模型

Instantaneous Undeformed Cutting Thickness Model for Five Axis Side Milling Considering Tool Eccentricity

在五轴侧铣加工过程中,两个旋转轴运动使得刀具姿态实时变化,增加了IUCT计算的复杂程度,为保障其计算精度往往采用较为耗时的计算方法。为了解决五轴侧铣铣削中IUCT预测效率低下的问题,提出一种考虑刀具跳动的IUCT计算方法。首先建立刀具的几何模型,沿刀轴方向将刀具离散,获得当前切削点的坐标。其次,根据两个相邻刀具的位置关系推导出IUCT的显性表达式。最后,通过对比该模型和现有模型,结果表明,所提出的IUCT预测模型不仅具有良好的计算效率,同时具有较高的预测精度。

In the five axis side milling process,the movement of two rotating axes causes real-time changes in the tool posture,increases the complexity of IUCT calculation.To ensure its calculation accuracy,time-consuming calculation methods are often used.In order to solve the problem of low prediction efficiency of IUCT in five axis side milling,a calculation method for IUCT considering cutting tool runout is proposed.Firstly,establish the geometric model of the cutting tool,discretize the tool along the axis direction,and obtain the coordinates of the current cutting point;Secondly,derive the explicit expression of IUCT based on the positional relationship between two adjacent cutting tools.Finally,by comparing this model with existing models,the results show that the proposed IUCT prediction model not only has good computational efficiency,but also has high prediction accuracy.