Transactions of the Korean Society of Automotive Engineers (한국자동차공학회논문집)

The Korean Society of Automotive Engineers (한국자동차공학회)
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A Study on Wear Characteristics of Cutting Tools in a Titanium Roughing Cut Machining

티타늄 황삭가공에 있어서 절삭공구의 마모 특성에 관한 연구

  • Bae, Myung-whan (Engineering Research Institute, Department of Mechanical Engineering for Production, Gyeongsang National University) ;
  • Jung, Hwa (Department of Computer Applied Mechanical, Jinju Campus of Korea Polytechnic) ;
  • Park, Hyeong-yeol (Department of Computer Applied Mechanical, Jinju Campus of Korea Polytechnic)
  • 배명환 (경상대학교 기계설계학과, 공학연구원) ;
  • 정화 (한국폴리텍대학 진주캠퍼스 컴퓨터응용기계과) ;
  • 박형렬 (한국폴리텍대학 진주캠퍼스 컴퓨터응용기계과)
  • Received : 2015.08.24
  • Accepted : 2015.11.26
  • Published : 2016.01.01
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Abstract

The application of titanium has been gradually rising because the utilizing ranges for low weight and high strength are rapidly increased by the need for improving the fuel economy in production industries such as the aviation and automotive in recent. The purpose in this study is to investigate the appropriate cutting conditions on the life of flat and round end mills by measuring the maximum cutting temperature relative to the machining time, and calculating the wear rates of cutting tool with the spindle speed and feed rate of vertical machining center as a parameter in the titanium roughing cut machining which is widely used in critical parts of aircraft, cars, etc. When the wetted roughing cut machining of titanium with a soluble cutting oil is conducted by the flat and round end mills, the maximum cutting temperatures for a variety of spindle speed and feed rate are measured at ten-minute intervals during 60 minutes by an infrared thermometer, and the wear rates of cutting tool are calculated by the weight ratios based on tool wear before and after the experiment. It is found that the maximum cutting temperature and the wear rates of cutting tool are raised as the cutting amount per tool edge is increased with the rise of feed rate, in this experimental range, and as the frictional area due to the rise of contacting friction numbers between tool and specimen is increased with the rises of cutting time and spindle speed. In addition, the increasing rate of maximum cutting temperature in the flat and round end mills are the highest for the cutting time from 50 to 60 minutes, and the wear rate of cutting tool in the flat end mill is 1.14 to 1.55 times higher than that in the round end mill for all experimental conditions.

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References

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