摘要
随着科学技术的发展，制造业发生了翻天覆地的变化，各种先进制造技术正逐渐地应用于制造系统中。制造系统正向着数字化、集成化、并行化、网络化及柔性化的方向发展。在现代制造系统中，数控加工设备是制造系统的核心设备，是现代制造系统的重要组成部分。数控加工技术是现代自动化、柔性化及数字化生产加工技术的基础与关键技术。数控切削加工工艺参数及刀具运动轨迹优化是发挥数控加工设备生产效率的有效途径。
本文在数控切削加工工艺优化方面主要进行了基于加工特征的刀具轨迹选择的研究。首先研究确定了铣削加工的加工特征;在此基础上，建立了基于PowerMILL加工特征的铣刀选择知识规则，并将其知识融入PowerMILL加工，实现数控刀具轨迹的优选。
数控加工刀具运动轨迹是确定数控加工工艺的重要环节。刀具运动轨迹设计质量的好坏，将直接影响零件的加工质量及加工成本。本文针对典型零件的铣削加工，对几种刀具运动轨迹进行优选。
关键词 数控加工，刀具选择，PowerMILL,刀具轨迹
Abstract
With the development of science and technology great changes have taken place in the manufacturing. Every kinds of advanced manufacture technology are applying in the manufacture system now. The manufacture system is developing in the direction of numeric ， integration parallelize ， network and flexible. In the system of modern manufacture,NC machining equipment is the core of the manufacture system and the important subassembly of the modern manufacture system. The technology of NC machining is the based and key machining technology of the modern automatic，flexible and numeric. The optimization of NC machining process parameters and the cutting tool path is the available approach of exerting the NC machining equipment productivity.
In this paper，we mostly discussed the cutting tool choice based on the feature of cutting process as belongs to the optimization of NC machining process parameters. Firstly we discussed and determined the feature of milling process，based on which we set up the knowledge rules of milling cutting tool choice. We applied the knowledge rules to the expert system of PowerMILL,which realized the cutting tool choice of NC machining.
Cutting tool path of NC machining is one of the important parts to determine NC machining process. Whether the tool path quality is good or bad will directly affect the machining and the machining cost of part. The milling cutting tool path creative method of representative part is studied in this paper. We optimized several cutting tool paths.
Keyword ：NC machining; cutting tool choice; PowerMILL; cutting tool path
