链轮齿形数控铣削加工的工艺研究

使用圆柱立铣刀数控铣削加工链轮,采用直角坐标系(直线轴)附加旋转轴的控制方式:应用直线轴控制多段曲线的连接,完成链轮轮齿轨迹的数控加工,使用数控回转工作台完成链轮零件的分齿运动,利用子程序来循环重复上述运动。此加工方式相比二维坐标轴数控加工链轮的控制方式,具有更为理想的加工效果。此加工方式,在保证零件设计基准、装夹定位基准和装配基准重合的基础上,应用子程序,有效地保证了链轮各齿形尺寸精度的一致性;使用旋转坐标控制,有效地保证和降低了了链轮轮齿的分齿误差。在数控铣床上使用普通圆盘工作台,利用暂停指令手动进行链轮齿形分齿运动的做法,更加完善和拓宽了数控技术具体应用的实用性。

Research on Technique of NC Milling the Teeth of Sprocket Wheel

The column milling cutter can be used to machining sprocket wheel by adding a rotary axis to a rectangular coordinate system. The linear axis which connects all curves together is used to machining the teeth of sprocket wheel and the rotary axis is used to carry out the dividing movement. The subprogram is used to repeat the above movement. This method can achieve more desirable effects than the traditional method of two-dimensional machining because the consistency of the size precision of the teeth will be ensured by using the subprogram and the errors of the dividing movement will be reduced on a basis of the superposition of the design standard and the orientation standard and the setting standard. The NC technology will be improved and widened by using a common disk-shaped workbench in a NC milling machine and using the pause instruction to carry out the dividing movement manually.