Effects of eco-friendly cooling strategy on machining performance in micro-scale diamond turning of Ti–6Al–4V

Peng Huang, Hongcheng Li, Wu Le Zhu, Haitao Wang, Guoqing Zhang, Xiaoyu Wu, Suet To, Zhiwei Zhu

Research output: Journal article publicationJournal articleAcademic researchpeer-review

34 Citations (Scopus)


Titanium alloys are difficult-to-cut materials due to their low elastic modulus and poor thermal conductivity. To deepen the understanding of the cutting performance for Ti–6Al–4V under various eco-friendly cooling conditions, surface integrity, cutting forces, and tool wear were comprehensively investigated through cutting experiments implementing three cooling methods, namely, cryogenic gas (CG), minimum quantity lubrication (MQL), and a combination of CG and MQL (CG + MQL), respectively. The results show that the lowest surface roughness (Sa = 76.71 nm) was achieved at a low spindle speed under the CG + MQL cooling conditions. This suggests that of the three cooling methods, the CG + MQL hybrid cooling method achieved the highest cooling efficiency. Compared with the MQL cooling method, the CG + MQL cooling method led to more pronounced tool wear and material adhesion due to reduced oil-based lubricity caused by low temperatures. Under the MQL cooling conditions, the elastic recovery of Ti–6Al–4V accelerated the formation of micro-cleavages on the clearance face of the diamond tool. Additionally, the depth of cut was also comparable to the tool edge radius in the micro-scale diamond turning. Compared with the conventional turning of Ti–6Al–4V, this round-edge effect, combined with the adhesion and built-up edge, led to a relatively stronger friction effect, evidenced by an increase in the coefficient of friction from 1.027 to 3.532, and higher specific cutting energy under all the cooling conditions in micro-scale diamond turning.

Original languageEnglish
Article number118526
JournalJournal of Cleaner Production
Publication statusPublished - 10 Jan 2020


  • Cryogenic gas cooling
  • Hybrid cooling
  • Micro-scale diamond turning
  • Minimum quantity lubrication
  • Ti6Al4V

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • General Environmental Science
  • Strategy and Management
  • Industrial and Manufacturing Engineering


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