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알루미늄 합금(Al7075-T651)의 얇은 벽 고속밀링 가공 시 가공표면 상태와 가공변형 특성
구준영(Joon-Young Koo),황문창(Moon-Chang Hwang),이종환(Jong-Hwan Lee),김정석(Jeong-Suk Kim) 한국생산제조학회 2016 한국생산제조학회지 Vol.25 No.3
Al alloys are useful materials having high specific strength and are used in machining of parts having thin-walled structures for weight reduction in aircraft, automobiles, and portable devices. In machining of thin-walled structures, it is difficult to maintain dimensional accuracy because machining deformation occurs because of cutting forces and heat in the cutting zone. Thus, cutting conditions and methods need to be investigated and cutting signals need to be analyzed to diagnose and minimize machining deformation and thereby enhance machining quality. In this study, an investigation on cutting conditions to minimize machining deformation and an analysis on characteristics of cutting signals when machining deformation occurs are conducted. Cutting signals for the process are acquired by using an accelerometer and acoustic emission (AE) sensor. Signal characteristics according to the cutting conditions and the relation between machining deformation and cutting signals are analyzed.
인코넬 718의 터닝가공에서 인서트 절입각이 경계마모 억제에 미치는 영향
구준영(Joon-Young Koo),김동규(Dong-Gyu Kim),강익수(Ik-Soo Kang),정윤철(Yun-Chul Jung),김영흠(Young-Heum Kim) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.6
Inconel is a representative super-alloy with excellent heat resistance, abrasion resistance, and corrosion resistance, and used as a material for key aerospace components. It is a difficult-to-cut material with a very short tool life owing to its low thermal conductivity, excellent high temperature strength, and excellent work hardening ability. In this study, machining characteristics were identified based on the entering angle in the Inconel 718 turning process. A finite element simulation was performed to derive the effective entering angle range to suppress notch wear, which is the main cause of end-of-tool life. Additionally, cutting temperature, stress, and pressure distribution were analyzed. Through comprehensive analysis of finite element simulations and machining experiments, an effective entering angle range was derived to suppress notch wear in the turning process of Inconel 718.
유전자 알고리즘을 이용한 마이크로밀링공구 수명 최적화에 관한 연구
구준영(Joon-Young Koo),김영준(Young-Jun Kim),장수훈(Su-Hoon Jang),김정석(Jeong-Suk Kim) 한국생산제조학회 2017 한국생산제조학회지 Vol.26 No.5
The micro-scale milling process is suitable for the machining of micro-scale three-dimensional shapes and is particularly effective for the machining of micro-channels and grooved patterns. Tools should be changed at an appropriate point in time to maintain high quality of machined surfaces and to improve productivity. Moreover, machining conditions that are optimized in terms of the tool life are required for the efficient use of micro-milling tools. In this paper, we propose a method for predicting the tool life of a micro-milling tool and establishing optimal machining conditions. Machining conditions are determined using a central composite design. An equation is derived for the tool life, and the effect of variables on the tool life is evaluated by carrying out a regression analysis on experimental results. Genetic algorithm is used to determine optimal machining conditions. The results of this study can be used to enhance machining efficiency in micro-scale milling processes.