| Summary: | 碩士 === 中原大學 === 機械工程研究所 === 81 === The complexities of sculptured surfaces often make machining
difficult and inefficient. Spiral-out pocket machining is
considered the most efficient roughing method. However, the
radial depth of cut varies with the geometry shape of the tool
path during spiral-out pocketing. This variance may cause
chatter or excess tool deflection problems. We have developed
calculation methods of the actual radial depth of cut for
circular tool paths. However, for applying these methods to
cavity machining of sculptured surface, the pocket boundaries
of free-form curves should be approximated with circular arcs.
Besides, the error should be located on the pocket side of the
approximated curve. In this thesis, we use the circlar arcs
which have centers located on the isometric line of two end
points of a curve element to approximate the curve. Then, based
on the Voronoi diagram we develop NC programming subroutines
for cavity roughing.
|
|---|
