数控端铣弧齿锥齿轮的刀背与轮齿干涉避免方法

在五轴数控机床上端铣加工弧齿锥齿轮时，为了避免中凹盘铣刀背锥面与对侧齿面发生干涉，提出了基于刀具和齿轮结构的干涉避免方法。通过确定加工轨迹上刀背圆锥面最突出母线与对侧齿面的位置关系，保证刀具背锥面沿进给方向的法曲率小于对侧齿面法曲率，优化确定刀具边缘厚度和背锥角，实现了端铣齿面时刀背不干涉对侧齿面。最后，以一对弧齿锥齿轮副的小轮为例，通过比较虚拟加工模型和理论模型，验证了所提干涉避免方法的有效性。

Interference-avoiding Methods between Cutters Back of Disc Cutter with Concave End and CNC Machined Spiral Bevel Gear Teeth

In order to avoid interference between the back of disc cutter with a concave end and gear teeth when spiral bevel gears are machined by a 5-axis CNC machine, the interference-avoiding methods were presented, based on structure of the cutter and gear respectively. According to the position relation between the cutter back cone and the opposite tooth surface，and the normal curvature values of cutter back cone should be higher than the values of the opposite tooth surface，the edge thickness and back cone angle of the cutter were determined, and the interference might be avoided. With a spiral bevel pinion as an example, through comparing the virtual machining tooth surface with the theoretical one, the feasibility of the interference-avoiding methods were verified.