从而减小了轴向力，使钻头定心稳、寿命长，提高了钻削速度和工作效率。

So the axial force is reduced, the fixing centre of the concave bit is stable and the concave bit has a long lifetime.

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分析结果表明，振动钻削改变了普通钻削的钻入机理，显著提高了钻入定心精度，特别适合微小孔的精密和超精密加工。

It is shown that vibration drilling entirely changes drill-entry mechanism of common drilling, remarkably improves drill-entry spotting accuracy.

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