http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
너트 프로젝션용접 품질 모니터링을 위한 전문가 시스템의 개발
김진우(J.W. Kim),임성룡(S.R. Lim),박찬우(C.W. Park),이광원(K.W. Lee),조상명(S.M. Cho) 대한기계학회 2002 대한기계학회 춘추학술대회 Vol.2002 No.4
It has been very significant for car manufacturers to develop the quality assurance technology because of the application of PL(Product Liability). In the present study, during the nut resistance projection welding the current and voltage signal could be monitored to evaluate the welding quality. At the same time, dynamic resistance pattern could be obtained by the application of Ohm's law. Appling the dynamic resistance slopes to be defined as the differencial of the dynamic resistance by the proper time, process unstable factors such as initial contact, initial heat input and force followability could be evaluated. And the square sum of welding voltage and the end resistance could be used to evaluate total heat input and nugget growth. By setting up the algorithm to evaluate the various unstable conditions, the Expert System could be developed for the quality monitoring of the nut projection welding(M8)
페라이트상을 갖는 마르텐사이트계 내열강의 미세조직 및 기계적성질에 미치는 시효처리의 영향
이상명(S. M. Lee),이정규(J. K,Lee),조영관(Y. K. Jo),이종문(J. M. Lee),강창룡(C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
This study was carried out to investigate the specimen in martensite structure added Mo and not added Mo on the aging treatment were generated each changes of microstructure and mechanical properties, the result obtained from this study are as follow: In case of specimen added Mo, A Laves phase was mainly precipitated in ferrite phase, while carbide and Laves phase were overlapping precipitated in martensite phase, on the interface of martensite and ferrite phase. In case of specimen not add Mo, A microstructure was unchanged in ferrite phase, while carbide was precipitated in martensite phase. In case of specimen added Mo, A ferrite hardness change existed two peaks with the increase of the aging time, while a martensite hardness change which a hardness in the early stage of aging was low, but a re-hardening was occurred with the increase of the aging time. In case of specimen not add Mo, While a ferrite hardness change of aging was not largely changed, a ferrite hardness change was sharply decreased in the early stage of aging, but it was slowly decreased with the increase of the aging time. The tensile strength of specimen added Mo was eventually decreased with the increase of the aging time, while the tensile strength of specimen not added Mo was slowly decreased. A Sharpy impact's value of specimen added Mo was largely decreased by the aging treatment, while it was slowly increased with the increase of the aging time, in case of specimen not add Mo was gradually increased in the early stage of aging, the aging time was long, then it was quickly increased. The Disk shape of Laves phase precipitation in the early stage of aging was largely decreased the impact toughness .
원심주조된 B50A349A내열강의 미세조직 및 기계적성질에 미치는 단조조건의 영향
이상명 (S. M. Lee),김윤규 (Y. K. Kim),최한글 (H. G. Choi),강창롱 (C. Y. Kang) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.6
The aim of study is investigated to develop the optimum forging conditions on B50A349A heat resistance steel. The results obtained from this study are as follow: With increase the forging rate, the hardness and tensile strength wase increased, but impact value and elongation wase decreased. With increase the forging start temperature, the hardness and tensile strength wase increased, while, impact value and elongation wase decreased. With increase the forging finishing temperature, the tensile strength and hardness wase increased, but elongation and impect value was decreased..