中文摘要：

摘要：基于坐标系变换原理进行五轴数控加工刀具全局干涉检测，将曲面检测点变换到刀具局部坐标系中，通过判断曲面点是否落到刀具半径范围内来判断是否为干涉点，大大降低了计算量，提高了数控加工效率。对于涉点通过最小二乘法确立最小包容区域以及刀具姿态最优偏转轴及偏转角。为了防止在偏转过程中产生新的干涉，确立了刀具姿态有效区域，使得偏转角度能够避免刀具干涉且在有效区域内。通过实例验证了所提方法的可行性和有效性。

英文摘要：

Based on coordinate system transformation theory, the problem of the global tool interference detection in five-axis sculptured surface Numerical Control （NC） machining was solved. The checking points of surface was changed into the local tool coordinate to determine whether it was the interference point or not. This method improved processing efficiency. The minimum zone of the interference point was established by using the least square method, and finded out the optimal deflection axis and angle. It was used to determine the feasible tool direction region of the tool position points including the direction of correct toot axis to avoid new interference. Experimental result proved that the proposed method was feasible, simple and effective.