4.3 Article

The effect of cryogenic cooling and minimum quantity lubrication on end milling of titanium alloy Ti-6Al-4V

Journal

JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY
Volume 29, Issue 12, Pages 5121-5126

Publisher

KOREAN SOC MECHANICAL ENGINEERS
DOI: 10.1007/s12206-015-1110-1

Keywords

Titanium; Cryogenic cooling; Liquid nitrogen; Tool wear; MQL; Cutting force monitoring

Funding

  1. Korea Institute of Industrial Technology (KITECH) [JA-15-0034]
  2. Ministry of Trade, Industry and Energy (MOTIE) in Republic of Korea [10048871]

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The cooling down of cutting temperature in machining is very important for the improvement of tool life, especially when dealing with work materials that have low thermal conductivity such as titanium alloy. In this study designed to investigate the machining performance of a variety of cooling methods, cryogenic, Minimum quantity lubrication (MQL), and flood cooling are performed on solid end milling of titanium alloy, Ti-6Al-4V. In particular, the effect of internal and external spray methods on cryogenic machining is analyzed with a specially designed liquid nitrogen spraying system by evaluating tool wear and cutting force at cutting conditions. The cutting force is also analyzed for tool breakage detection. As a result, the combination of MQL and internal cryogenic cooling improves tool life by up to 32% compared to conventional cooling methods. The cutting force is also reduced significantly by this combination of cooling and lubrication strategy of side end milling.

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