Transactions of Materials Processing (소성∙가공)

The Korean Society for Technology of Plasticity and materials processing (한국소성∙가공학회)
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Friction Characteristics of Warm a Forging Lubricant Containing Nano Graphite Powder

나노분말이 함유된 온간단조용 윤활제 마찰특성

  • 김대원 (한국생산기술연구원 정밀성형기술센터) ;
  • 김영량 (삼영화학) ;
  • 이근안 (한국생산기술연구원 정밀성형기술센터) ;
  • 최호준 (한국생산기술연구원 정밀성형기술센터) ;
  • 윤덕재 (한국생산기술연구원 정밀성형기술센터) ;
  • 신영철 (한국생산기술연구원 정밀성형기술센터) ;
  • 이준균 (한국생산기술연구원 정밀성형기술센터) ;
  • 임성주 (한국생산기술연구원)
  • Received : 2011.08.18
  • Accepted : 2011.12.21
  • Published : 2012.02.01
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Abstract

During warm forging, materials are formed in the temperature range of $300^{\circ}C\sim900^{\circ}C$. In this temperature range, the friction between the forging die and the material is very high and has a negative effect on the forming process causing severe die wear and possible defects in the component because of stick-slip. Thus, lubrication characteristics are a very important factor for productivity during warm forging. In this paper, ring compression experiments were conducted to estimate the friction factor between the die and the materials as the main factor in characterizing the lubricant. Also, ring tests using normal graphite power as a lubricant coating system were compared with tests using nano graphite powder. The results confirm that the nano graphite is superior to the normal graphite in view of its lubricating effect. In addition, the friction factor (m) was estimated with respect to the amount of the nano graphite content in the lubricant. With 10 % nano graphite the friction factor had the lowest value as compared to other amounts. It can be concluded that the amount of the nano graphite in the coating system can be optimized to obtain the best lubrication condition between the die and the material using ring test experiments.

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References

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