지원사업
학술연구/단체지원/교육 등 연구자 활동을 지속하도록 DBpia가 지원하고 있어요.
커뮤니티
연구자들이 자신의 연구와 전문성을 널리 알리고, 새로운 협력의 기회를 만들 수 있는 네트워킹 공간이에요.
초록· 키워드
오류제보하기
During warm forging, materials are formed in the temperature range of 300℃ ~ 900℃. 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.
목차
Abstract
1. 서론
2. 링 압축 실험 조건
3. 링 압축 실험 결과
4. 결론
참고문헌
참고문헌 (8)
참고문헌 신청
1. [학술지(정기간행물)] - M. Knoerr / 1996 / Fatigue Failure of Cold Forging Tooling : Causes and Possible Solutions Through Fatigue Analysis / J. Mater. Process. Technol 46 (1) : 57 ~ 71
2. [단행본] - J. A. Schey / 1983 / Tribology in Metalworking Friction, Lubrication and Wear / American Society for Metals : 32 ~ 73
3. [학술지(정기간행물)] - X. Tan, P. / 1998 / Fricition Studies at Different Normal Pressures with Alternative Ring-compression Tests / J. Mater. Process. Technol 80 : 292 ~ 297
4. [학술지(정기간행물)] - P. Hartley / 1979 / Friction in Finite-element Analyses of Metalforming Process / Int. J. Mech. Sci 21 (5) : 301 ~ 311
5. [학술지(정기간행물)] - N. T. Rudkins / 1996 / Friction Modeling and Experimental Observation in Hot Ring Compression Tests / J. Mater. Process. Technol 60 (3) : 349 ~ 353
2. [단행본] - J. A. Schey / 1983 / Tribology in Metalworking Friction, Lubrication and Wear / American Society for Metals : 32 ~ 73
3. [학술지(정기간행물)] - X. Tan, P. / 1998 / Fricition Studies at Different Normal Pressures with Alternative Ring-compression Tests / J. Mater. Process. Technol 80 : 292 ~ 297
4. [학술지(정기간행물)] - P. Hartley / 1979 / Friction in Finite-element Analyses of Metalforming Process / Int. J. Mech. Sci 21 (5) : 301 ~ 311
5. [학술지(정기간행물)] - N. T. Rudkins / 1996 / Friction Modeling and Experimental Observation in Hot Ring Compression Tests / J. Mater. Process. Technol 60 (3) : 349 ~ 353
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UCI(KEPA) : I410-ECN-0101-2014-551-000232021