The concept and the character of cuttingtool reliability and the reliability model of nccutting tools are presented.
通过分析数控加工刀具的特点，提出刀具可靠度的概念和性质以及数控刀具的可靠度模型。
2
NC flame cutting: CNC flame cutting is numerical control machine tool use gas with oxygen or gasoline in metal materials with oxygen cut a way to cut.
数控火焰切割：数控火焰切割是数控机床利用燃气配氧气或者汽油配氧气进行金属材料切割的一种切割方式。
3
To aim at the research on cutting direction in NC machining of free-form surfaces, a simplified time model for tool trace is established, and the system of tool path programming is discussed.