摘要
采用CAD变量几何法,用两种新型5自由度3SPS+RRPU和2SPS+RRPRR并联机床对任意3D自由曲面进行法向加工。通过CAD几何约束和尺寸驱动技术,首先建立两种并联机床的模拟机构,再在并联机构动平台上构造任意3D自由曲面和刀具轨迹的引导平面,与并联机构合成,得到模拟并联机床。保持刀具与自由曲面垂直关系,给定加工路径,各驱动杆长和动平台的位置能自动求解和动态显示。结果表明:CAD变量几何法不仅简单直观,而且省去了大量的编程计算。
A novel CAD approach is proposed to machine a 3D free-form surface in its normal direction by using two kinds of parallel machine tools（3SPS＋RRPU and 2SPS＋RRPRR）.First,the simulation mechanisms of parallel manipulators are created.Second,a 3D free-form surface and a guiding plane of tool path are constructed above the moving platform of the simulation mechanism;and then combined with the parallel machine tools,the simulation parallel machine tools for machining a 3D free surface are obtained.Third,the tool axis of simulation parallel machine tools are retained perpendicular to the 3D free-form surface.In the light of two prescribed tool paths,the driving limbs and pose of the moving platform of parallel machine tool are solved automatically and visualized dynamically.The simulation results show that the approach can be used to machine any unknown surface without compiling computer program,and is also advantageous from viewpoint of accuracy and repeatability.
出处
《机械设计与研究》
CSCD
北大核心
2011年第5期88-91,共4页
Machine Design And Research
关键词
CAD变量几何法
并联机床
3D自由曲面
法向加工
computer aided geometry
parallel machine tool
3D free-form surface
normal machining
