“等导程”锥形刀具是采用一种新工艺方法加工而成,沿刀齿全长的螺旋角是变化的(小端的螺旋角小,大端的螺旋角大),这就给我们测量螺旋角和导程带来了困难,为了解决这一问题,我们首先从“等导程”的圆锥螺旋线的形成来分析。一、等导程的圆锥螺旋线形成原理从圆锥顶点o沿锥面母线作一固定直线oy,如图1所示。设动点a自顶点o沿oy方向匀速移动。在此同时,圆锥绕其本身的轴线匀速转动,则a点将在锥面上形成一条螺旋线。假设 “Equal lead” conical tools are machined from a new process and the helix angle varies along the entire length of the tooth (the small helix angle at the small end and the large helix angle at the large end), which gives us the measurement of the helix Angle and lead to bring difficulties, in order to solve this problem, we first from the “equivalent” of the formation of the conical spiral to analyze. First, the guide of the formation of the principle of the conical helix from the cone vertex o along the tapered bus for a fixed line oy, as shown in Figure 1. Set point a from the top o along oy direction uniform speed. At the same time, the cone rotates at a constant speed about its own axis, and point a will form a spiral on the cone. Assumptions