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고정밀 Cross Drilling/Milling 유닛 설계에 관한 연구
최요한(Yeo-Han Choi),이도영(Do-young Lee),백진욱(Jin-Uk Back),류성기(Sung-Ki Lyu) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.7
High-precision driving system design technology is an important factor limiting the development of the precision manufacturing industry. In recent years, high-precision machine tool driving system optimization has become a widespread research field. Automatic shelf manufacturers have relied on the import of cross-drilling/milling units, a key component of machine tools, but now demand localization and performance improvements to increase cost competitiveness. The cross-drilling/milling unit is a tool-stand unit mounted on an automatic shelf, a type of machine tool, and performs the key function of rotating the tool for processing materials. In this study, the design of teeth microgeometry of the rotating gear of a cross-drilling/milling unit was investigated. After optimization, a prototype was produced, and improved part parameters, such as profile, lead, runout, and pitch errors, were confirmed through various tests.
17cc급 자동차용 압축기의 고체윤활 최적화 및 구조 설계에 관한 연구
양용군(Yong-Kun Yang),진진(Zhen Qin),최요한(Yeo-Han Choi),류성기(Sungki Lyu) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.12
Fuel economy has always been a major issue in the automobile industry, especially owing to the associated environmental concerns. It is widely known that only 5-20% of the energy generated by automobiles running on internal combustion engine engines is used as power, while the rest is consumed because of friction between components. The main components of the reciprocating piston type compressor used in vehicles, such as the shaft, swash plate, piston, and cylinder, cause severe energy loss owing to frictional contact between each other. The wear contact between the main shaft and the other components is particularly severe. Most quality issues arise owing to the sticking phenomenon that occurs between these parts. In this study, a coating solution to reduce friction is prepared by mixing adhesive solid lubricant, organic binder-polyadimide, inorganic binder (Binder), and graphite in four different ratios, and the best combination is determined.