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권동희,김정석,김민욱,정영근,강명창,Kwon, Dong-Hee,Kim, Jeong-Suk,Kim, Min-Wook,Jeong, Young-Keun,Kang, Myung-Chang 한국분말야금학회 2008 한국분말재료학회지 (KPMI) Vol.15 No.5
To satisfy the demand of higher cutting performance, mechanical properties with tungsten carbide (WC-Co) tool materials were investigated. Hardness and transverse rupture strength with WC grain size, Co content and density were measured. Compared to H, K, and S manufacture maker as tungsten carbide (WC-Co) tool materials were used for high-speed machining of end-milling operation. The three tungsten carbide (WC-Co) tool materials were evaluated by cutting of STD 11 cold-worked die steel (HRC25) under high-speed cutting condition. Also, tool life was obtained from measuring flank wear by CCD wear measuring system. Tool dynamometer was used to measure cutting force. The cutting force and tool wear are discussed along with tool material characteristics. Consequently, the end-mill of K, H manufacture maker showed higher wear-resistance due to its higher hardness, while the S maker endmill tool showed better performance for high metal removal.
절삭력 신호를 이용한 마이크로 엔드밀의 수명 예측에 관한 연구
권동희(Dong-Hee Kwon),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
The prediction of tool life is one of the most important factors for increasing reliability, stability, and productivity of manufacturing system. This paper deals with a tool life prediction method in view of reliability assessment for micro endmill. In this study, flank wear was focused among multi-factors deciding the tool wear state. The magnitude of flank wear and cutting force have been measured in micro endmilling with high revolution air turbine spindle. The proposed monitoring method using cutting force is effective for predicting tool life of micro endmill. Therefore, this technique can be applicable to micro machining processes monitoring in the near future.
권동희(Dong-Hee Kwon),황인옥(In-Ok Hwang),이종환(Jong-Hwan Lee),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
The investigation for microscopic precision of workpiece is necessary for machinability evolution and the environmentally conscious machining technology have more important position in machining process. In the milling process, the cutting fluid has greatly bad influence on the environment. The damaged layer affect machine parts in machining. In this study, the cutting force, cutting temperature, Von-Mises stress, and plastic deformation layer according to variation of cooling and lubrication method is investigated by simulation and experiment. And the surface roughness is evaluated according to machining environment. Finally, it is obtained that the characteristics of damaged layer in environmentally conscious machining is better than that conventional machining using cutting fluid.
C-means 알고리즘을 이용한 마이크로 엔드밀의 상태 감시
권동희(Dong-Hee Kwon),정연식(Yun-Shick Jeong),강익수(Ik-Soo Kang),김전하(Jeon-Ha Kim),김정석(Jeong-Suk Kim) 한국생산제조학회 2005 한국생산제조시스템학회 학술발표대회 논문집 Vol.2005 No.5
Recently, the advanced industries using micro parts are rapidly growing. Micro endmilling is one of the prominent technology that has wide spectrum of application field ranging from macro to micro parts. Also, the method of micro-grooving using micro endmilling is used widely owing to many merit, but has problems of precision and quality of products due to tool wear and tool fracture. This study deals with condition monitoring using acoustic emission(AE) signal in the micro-grooving. First, the feature extraction of AE signal directly related to machining process is executed. Then, the distinctive micro endmill state according to the each tool condition is classified by using the fuzzy C-means algorithm, which is one of the methods to recognize data patterns. These result is effective monitoring method of micro endmill state by the AE sensing techniques which can be expected to be applicable to micro machining processes in the future.
권동희(Dong-Hee Kwon),박진효(Jin-Hyo Park),김정석(Jeong-Suk Kim),김병민(Byung-Min Kim),정융호(Yoong-Ho Jung),강명창(Myung-Chang Kang) 한국생산제조학회 2007 한국생산제조시스템학회 학술발표대회 논문집 Vol.2007 No.10
As demands for micro parts are on the increase in recent industries such as aerospace, biomedical, electronics, environment, information technology and display, the need for manufacturing such parts is also increasing. Major methods of manufacturing micro parts are based on semiconductor process technology such as lithography and etching and non-traditional machining using lasers, ultrasonic, ion-beams or electrical discharge. However, these methods require lots of time, workpiece materials are limited, and such methods are only applicable to the machining of two-dimensional shapes. Therefore, mechanical machining methods are required for the manufacturing of micro parts with complex shapes. This paper presents an investigation on the characteristics for micro groove machining by using the ultrahigh-speed air turbine spindle, and verifies the properties of mechanical method in fabricating molds for micro barrier ribs. As a result, the optimal machining condition could be found from the investigation of surface roughness according to the kinds of burr shapes in the fabricating of iron mold by using micro endmill.
권동희(Dong-Hee Kwon),황인옥(In-Ok Hwang),이종환(Jong-Hwan Lee),강명창(Myung-Chang Kang),김정석(Jeong-Suk Kim) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
The investigation for microscopic precision of workpiece is necessary for machinability evolution and the environmentally conscious machining technology have more important position in machining process. In the milling process, the cutting fluid has greatly bad influence on the environment. The damaged layer affect machine parts in machining. In this study, the cutting force, cutting temperature, Von-Mises stress, and plastic deformation layer according to variation of cooling and lubrication method is investigated by simulation and experiment. And the surface roughness is evaluated according to machining environment. Finally, it is obtained that the characteristics of damaged layer in environmentally conscious machining is better than that conventional machining using cutting fluid.