Study on Mechanism of Tap Breakage in Low Frequency Torsional Vibration Tapping

Feng Qi Han; Zhi Zun Li; De Yuan Zhang

doi:10.4028/www.scientific.net/AMM.37-38.1306

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vols. 37-38Study on Mechanism of Tap Breakage in Low...

Study on Mechanism of Tap Breakage in Low Frequency Torsional Vibration Tapping

Abstract:

Early breakage of tap often occurs when tapping on difficult-to-cut materials with the method of low frequency torsional vibration tapping, which decreases the technological effect and restricts its application. The effect of impact load on tap breakage in vibration tapping was analyzed, and the stress state in tap teeth was simulated by FEM, on this basis, it is concluded that too large tensile stress in tap teeth is the main cause of early breakage of tap. To reduce the tensile stress and enhance the shock resistance of tap teeth, the tap should be ground to minor negative rake angle. Experiments showed that the failure mode of grinded taps changed to wear, and thereby the service life of tap was prolonged significantly.

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Periodical:

Applied Mechanics and Materials (Volumes 37-38)

Pages:

1306-1310

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.37-38.1306

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Online since:

November 2010

Authors:

Feng Qi Han, Zhi Zun Li, De Yuan Zhang

Keywords:

Low Frequency Torsional Vibration Tapping, Service Life of Tap, Tap Breakage

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