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

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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.
英语翻译Thefeed direction was parallel to the Y-axis (Figure 3)
进给方向与Y轴平行,并且在表面生成了23刀具路径.采用了两种加工策略,可变的优化倾角和恒定倾角.恒定倾角被设为19.3°,这样以来,通常凹入区域可以获得免凿刀具路径.两个加工部件沿着X轴(垂直于进给方向)的扇形高度得以分析(表2).在凹入区域,恒定方向和优化刀具方向相差为20mm,比凸出区域测得的大差值要小.此外,倾角优化策略使凸起区域的倾角回到大约为9°.
7 结论
本文说明了基于面模型的5轴刀具路径生成的新算法.为实现最高的材料去除率,对平端铣刀的倾角进行动态优化.进一步改进刀具的倾角,最终采取提刀的办法,消除了开凿问题.而实施刀具倾角控制解决了cc点附近开凿导致的倾角突然变化问题.机加工结果证明了基于面模型生成多轴刀具路径的可行性.
基于面模型开发五轴铣刀路径生成算法
摘要
本文说明了基于面模型或镶嵌模型的5轴铣刀路径生成算法的开发.第一步,为了在各个切割工具接触点实现最大的材料去除率,开发的算法优化刀具的倾角.将平端切割工具的刀具轮廓与代表刀具接触点部分表面曲率的临时曲线匹配,实现这一点.第二步,改进倾角,并沿法向量提刀,以消除刀具和表面之间的开凿问题,并平滑沿着刀具路径的刀具倾角行为.最后,本文说明了一些试验结果.
1 序言
形状复杂的部件,压模、模具、涡轮机叶片和航空部件,可以采用五轴铣削进行高效加工[1].当根据待加工表面的局部曲率资料,对平端或环形切割工具的刀具方向进行动态优化,而采用五轴铣削策略时,优势更为明显[2,3,4,5] .如今,越来越多的CAM系统采用面模型而非参数模型(如NURBS)作为生成刀具路径的根据.面模型,也称三角形或镶嵌模型,可包含多个表面小块,而仅表示为三角形网格.