Tests show that AE signals may be detected from background noises in cutting process, a few hundreds millisecond before tool break down abrupt.

试验结果证明，刀具破损前会出现预兆性的AE信号，并可把该信号从背景噪声中检测出来。

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With features of superhigh hardness and strength, the cutting tool is broken down frequently when female thread was processed using titanium alloy.

钛合金材料由于存在硬度高、强度大等特点，在进行内螺纹加工过程中刀具经常损坏。

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