The reason of tool_trapping appeared in the numerical control milling of three dimensional 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。
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.
应用计算机建立精确的三维数学模型，并用高精度数控铣床加工出铸造用模具。
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