62
Q. Liu et al.
Fig. 6.2 Mathematical Model of Helical Edge Line of the Cutting Tool
The geometric equation of the cutting edge line of the cutter is divided into
two parts because both bottom and side cutting edges of the cutter are involved
in removing material during the micro-milling process. Assuming that the cutting
edge line on the cutting tool is l, then l = l 1 + l 2 , l 1 is the geometric equation of
the cutting edge line on the side of the cutting tool and l 2 is the geometric equation
of the cutting edge line on the bottom of the cutting tool. Compared with the side
cutting edge, the bottom cutting edge has little effect on machining quality. The
cutting coordinate system is shown in Fig. 6.3. Equation (6.2) is the equation of the
edge line.
Fig. 6.3 Milling Cartesian coordinate system