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Onset and evolution of discontinuously segmented chip flow in ultra-high-speed cutting Ti-6Al-4V

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Abstract

Increasing the cutting speed to an ultra-high level usually gives rise to a chip flow transition from continuously serrated to discontinuously segmented, which is one of the most fundamental and challenging problems in metal cutting. In this work, we experimentally performed the ultra-high-speed cutting on Ti-6Al-4V with a maximum cutting speed of 210 m/s, focusing on the physical phenomena accompanying the discontinuously segmented chip flow. It reveals that the discontinuously segmented chip flow can be attributed to the shear fracture induced by the fully matured shear banding, and there exists a ductile-brittle transition of the shear fracture as the cutting speed increases to an ultra-high level. In addition, the critical condition for the onset of segmented chip flow is presented using the momentum diffusion-based shear band evolution model, which gives good prediction for the chip segmentation.

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Authors and Affiliations

  1. Department of Engineering Mechanics, College of Pipeline and Civil Engineering, China University of Petroleum, Shandong, 266580, China

    G. G. Ye & S. F. Xue

  2. Key Laboratory of Environmental Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    W. Ma

  3. State Key Laboratory of Nonlinear Mechanics, Institute of Mechanics, Chinese Academy of Sciences, Beijing, 100190, China

    L. H. Dai

Authors
  1. G. G. Ye
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  2. S. F. Xue
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  3. W. Ma
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  4. L. H. Dai
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Correspondence to L. H. Dai.

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Ye, G.G., Xue, S.F., Ma, W. et al. Onset and evolution of discontinuously segmented chip flow in ultra-high-speed cutting Ti-6Al-4V. Int J Adv Manuf Technol 88, 1161–1174 (2017). https://doi.org/10.1007/s00170-016-8847-2

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  • DOI: https://doi.org/10.1007/s00170-016-8847-2

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