【摘要】 为适应叶轮流道的高速加工,提出了一种新的端面铣削5轴加工刀轨生成算法。该算法首先提取原加工刀轨面的上下边界边,接着采用5次NURBS曲线拟合此上下边界边,然后顺序地连接上下NURBS曲线的型值点,最终生成了全程C2连续的刀位曲线和空间平滑变化的刀轴矢量,应用于Superm an CAMⅡ原型系统中。经测试,该算法的运行速度已接近于UG,所生成的加工刀轨加工材料为铝合金的叶轮流道,刀具能以转速5 000r/m in以及进给速度600 mm/m in平稳地进行精加工,满足了高速走刀的要求。更多还原

【Abstract】 If the impeller channel is machined by conventional Five-axis machining tool paths which are not smooth and continuous,it is impossible to raise the feed-rate.To adapt high speed machining(HSM),an algorithm of Five-axis tool-path generation for the HSM impeller channel is put forward.Firstly,upper-and-lower boundary edges,located in any other original surfaces for the tool path generation,are picked up,and then these edges are fitted by the fifth order NURBS curve.After then data points located in two fifth order NURBS curves are connected by one-to-one mapping.Finally,the tool path including the CL-curve and tool orientation generated by the algorithm is smooth-C~2-continuous.The algorithm has been applied to the Superman CAMⅡ prototype system.It is nearly as fast as the one of UG at the run-velocity.Test results show that it works quite stable in finish-machining impeller channel with Al alloy at a spindle-speed of 5 000 r/min and a feed-rate 600 mm/min.Accordingly it is very beneficial for high speed machining.更多还原