The reason of tool_trapping appeared in the numerical control milling of threedimensional flow impeller is analyzed and the solving measure is put forward.
分析了离心式压缩机三元叶轮数控铣制时出现挖刀现象的原因，提出了解决措施。
2
A precise three - dimensional mathematics model has been established with a computer, and the moulds have been manufactured by using the sophisticated NC milling machine.