进一步指出，当切削方向背离破坏区扩展方向时，能得到较好的已加工表面质量。
It is further shown that the cutting direction has a remarkable effect on the machined surface quality.
切削温度不仅直接影响刀具的磨损和耐用度，而且也影响工件的加工精度和已加工表面质量。
Cutting temperature has direct effects on not only tool wear and tool life but also machining accuracy and quality of machined surfaces.
由于切削时的温度场对刀具磨损的部位、工件材料性能的变化、已加工表面质量都有很大的影响，因而对温度场的研究也显得尤为重要。
Because the influence of temperature to tool area, work material performance's variety and the machined surface's quality, the research to temperature field in metal cutting is very important.
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