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分析了切削刃不对称钻削时孔径扩张的原因，进行了不对称钻削的孔径测量实验，提出了一种新 刃形钻头，可以减小不对称钻削时产生的径向力而提高孔加工精度。
This paper analyzes the reason of the aperture expansion when the cutting edge is asymmetric drilling, and conducts the asymmetry drilling aperture measurement experiment. A new bit drilling bit is proposed to reduce the radial force during asymmetric drilling and improve the hole Precision.