英语翻译Thefeed direction was parallel to the Y-axis (Figure 3)

英语翻译
The
feed direction was parallel to the Y-axis (Figure 3) and
23 tool path tracks have been generated over the
surface.Two machining strategies,a variable optimised
and a constant inclination angle,have been applied.The
constant inclination angle was set to 19.3°,which normally gives a gouge free tool path in the concave
area.The scallop height along the X-axis (perpendicular
to the feeding direction) of the two machined parts has
been analysed (Table 2).In the concave area,the difference between the
constant and the optimised tool orientation is 20 mm and
is relatively small compared to the big differences
measured in the convex area.Further,the inclination
angle optimisation strategy brings the inclination angle
in the convex area back to almost 0°.
7 CONCLUSION
The paper described a new algorithm for 5-axis tool path
generation based on faceted models.The inclination of
a flat end-mill is dynamically optimised for maximal
material removal rate.Gouging is eliminated by further
adapting the tool inclination angle,eventually combined
with tool lifting.Sudden changes in the inclination angle,
due to gougings near the cc-point,has been solved by
the implementation of tool inclination angle control.
Machining results show the feasibility of multi-axis tool
path generation based on faceted models.
Development of a Five-axis Milling Tool Path Generation Algorithm based
on Faceted Models
Abstract
This paper describes the development of a 5-axis milling tool path generation algorithm based on faceted
or tessellated models.In a first step,the developed algorithm optimises the tool inclination angle for
maximal material removal rate in each cutter contact point.This is obtained by matching the tool profile
of a flat end cutter with a temporary spline representing the curvature of the part surface in the tool
contact point.In a second step,the elimination of gouging between the tool and the surface and a
smooth behaviour of the tool inclination angle along the tool path is obtained by a combination of tool
inclination angle adaptation and tool lifting along the normal vector.Finally,the paper describes some
experimental results.1 INTRODUCTION
Complex shaped parts such as dies,moulds,turbine
blades and aerospace parts,can efficiently be machined
by five-axis milling [1].The advantages become even
more obvious when five-axis milling strategies are used
where the tool orientation of a flat-end or toroidal cutter
is dynamically optimised based on the local curvature
information of the surface to be machined [2,3,4,5].
Today,more and more CAM systems become available
using faceted models instead of parametric models (e.g.
NURBS) as a basis for tool path generation.Faceted
models,also called triangulated or tessellated models,
may contain multiple surface patches and are simply
represented as a mesh of triangles.