七轴并联机床加工汽轮机叶片技术及其工作空间干涉检查研究

并联机构自从1980年就应用于机器人作业,但是第一台并联机床却出现在14年以后.目前,研究并联机床在铣削加工能力方面的文献很少,文章着力于研究并联机床在铣削加工尤其是加工自由曲面的能力.文中描述了并联机床在铣削加工汽轮机叶片的实际应用. 研究了基于UG CAD/CAM铣削汽轮机叶片技术,并考虑了并联机床粗加工和半精加工的效率和精加工的精度控制.UG CAM产生的刀具轨迹文件,不能直接被并联机床数控系统识别,所以必须进行后置处理,文中提出了面向七轴并联机床的刀具轨迹后置处理技术,以生成并联机床CNC系统可读的加工代码.最后为了避免机床在加工中的干涉,针对七轴并联机床的特性,提出了快速工作空间检查算法.

Turbine Blade Machining Technologies By 7-axis Parallel Kinematics Machine and Workspace Interference Check

Parallel mechanisms have been developed since 1980 for robotic tasks, while the first parallel kinematics machine(PKM) appeared only 14 years later. Since then, very few papers have been published that deal with the potential of these structures in milling. The objective of this study is to show the potentialities of PKM in milling and especially in high-speed milling of free form surfaces. This paper describes a new practical application of milling for machining turbine blade using PKM. The CAD/CAM technologies based on UG for machining turbine blade are investigated in this research. The machining efficiency in the rough and semi-finish milling process is considered. The machining accuracy is an important consideration for final finish milling. The planning of the tool path and the generation of the NC post-processing oriented to PKM for manufacturing the turbine blade are also discussed. At last, fast algorithm checking tool path is presented for avoiding PKM workspace interference.