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최인규(In Kyu Choi),이수영(Su Young Lee),김상호(Sang Ho Kim) 한국표면공학회 2014 한국표면공학회지 Vol.47 No.6
Wear characteristic of the nitrided SKD61 which is a typical mold material using for the extrusion of Al6061 alloy was investigated. The surface of SKD61 was nitrided by salt bath and plasma processes. The thickness of surface nitride layer was about 8.9 μm ~ 21.3 μm. Reciprocating friction wear test conducted using pin on disk type indicated the plasma treatment followed salt bath has a lower friction coefficient and a smaller adhesive wear with Al6061 alloy. That was identified by the Fe₄N which has a better wear resistance than FeN mainly formed by plasma nitriding.
알루미늄 합금의 압출 금형용 SKD61 강재의 질화특성과 마모에 대한 연구
문선철(SeonCheol Moon),김상호(Sangho Kim) 한국자동차공학회 2013 한국자동차공학회 지부 학술대회 논문집 Vol.2013 No.5-2
The friction and wear characteristics of nitriding coatings on SKD61 which is mold material using for extrusion of aluminum alloy were investigated. The coatings were deposited by the gas nitride, salt bath nitride and oxidation treatment the thickness were about 181㎛, 148 ㎛ and 65 ㎛ respectively. Reciprocating friction wear tests were conducted by varying pin load and temperature of counter substrate at un-lubricated condition. The pin loads were 15 kgf and the substrate temperatures was 120℃ and measured the hardness of the nitrideds surface by micro Vickers. We confirmed the sample characteristics based on the analysis of each.
항공기 보조동력장치 내 입구안내익 구동기어의 마모 결함 개선 연구
김세운,김지홍,이동기 국방기술품질원 2023 국방품질연구논집 Vol.5 No.1
In this study, the wear and sticking defects that occur repeatedly in the inlet guide vane (IGV) in the aircraft auxiliary power unit (APU) were analyzed. Vibration was confirmed to be the cause of the defect through two cases of improvement performed to improve the defect. Root cause corrective action (RCCA) was performed for vibration analysis, and the results of vibration analysis confirmed that the fault occurred due to friction between gears while the order component of the APU and the vibration frequency of the components matched. To improve this, a method to avoid resonance or reinforce the driving gear was proposed, and the effectiveness of four methods for applying this was verified. A proof of concept test was conducted to verify each method, which confirmed that there was no wear on the drive gear coated with lubricant. In addition, the rig test was performed to confirm that the degree of wear of the drive gear treated with salt bath decreased by approximately 1/5 compared to the conventional material. In addition, it was confirmed that the wear occurrence time of the improved shape increased more than five times compared to the previous one because the wear occurrence time of the existing shape took 182h. Through this, along with lubricant application, reinforcement of the drive gear through salt bath nitriding treatment was selected as the optimal improvement plan.