bit wear meaning in English

钻头磨损

Although it might be a bit worn and faded
虽然比起当初的富丽堂皇，
The cutting performances of the bits are analyzed from the following aspects , such as bit wear , working life , machining efficiency and machining quality
从工具磨损、工具寿命、加工效率及加工质量等方面对钻头加工工程陶瓷的性能进行了全面分析。
The results show that : the whole bit wear process can be divided into three phases ; the regularity of the machining time per hole with the number of holes machined is close to a periodic variation ; higher machining efficiency or working life can be obtained when the drilling pressure and the wall thickness of the bit are advisable
发现钻头的整个磨损过程可分为3个阶段；孔加工时间随孔数近似呈周期性变化；钻压和钻头壁厚适当时，可获得更高的加工效率或者工具寿命。