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강명창,김정석,이득우,강호성,김광호,Kang, M.C.,Kim, J.S.,Lee, D.W.,Kang, H.S.,Kim, K.H. 한국기계가공학회 2002 한국기계가공학회지 Vol.1 No.1
Machining quality has been improved with the development of cutting tools. However, it is difficult to obtain a high degree of quality in machining a deep pocket with a long end mill, since machining accuracy is mainly dependent on the stiffness of the cutting tool and tool holder. To improve machining quality in machining a deep pocket using an end mill, the performance by cutting condition compare with others. Owing to this problem, it is necessary to select suitable tool and holder in the deep pocket machining. In this study, the hydraulic holder for the high speed machining is introduced and the performance of that is compared with others according to cutting conditions. The cutting parameters involved were; slenderness ratio in the range of 3 to 6 (L/D), radial depth of cut from 0.01 to 0.05 mm. Cutting force and surface roughness, precision of form were observed during the experiment to investigate cutting state.
강명창,김민욱,권동희,박인덕,정영근,Kang, Myung-Chang,Kim, Min-Wook,Kwon, Dong-Hee,Park, In-Duck,Jeong, Young-Keun 한국재료학회 2008 한국재료학회지 Vol.18 No.12
In this paper, experimental studies of the regrinding of tungsten carbide (WC-Co) tools for high-speed machining were conducted. Regrinding and a subsequent evaluation test were carried out for a flat endmill tool with diameters of 10 mm and 3 mm using a CNC five-axis tool grinder and a CNC three-axis machining center. Tool wear on the two types of endmill tools increased as the cutting length increased, and the tool wear was not influenced by the regrinding state. In case of the micro endmill with a tool diameter of 3 mm, the effective regrinding time was determined for a flank wear threshold of 0.3 mm considering the tool life according to cutting length. The tool lives of the 10 mm and 3 mm endmill tools were increased by 80% and 72%, respectively. This conclusion proves the Feasibility of the recycling of tungsten carbide materials in the high-speed machining of high-hardened materials for industrial applications.
볼엔드밀 가공에서 절삭속도 일정제어기법에 의한 커넥팅로드 가공기술
강명창,정융호,김정석,문성준,김경균,Kang, Myung-Chang,Jung, Young-Ho,Kim, Jeong-Suk,Moon, Sung-Jun,Kim, Kyung-Kyoon 대한기계학회 2002 大韓機械學會論文集A Vol.26 No.6
The purpose of this study is to suggest how the machining technique of constant control of cutting speed can improve precision machining and tool life in high speed machining using a ball end mill. Cutting speed is changed in machining fee form surfaces such as connecting rod die. So, we don't have supreme surface form and tool life on machining. To solve this problem we should settle on optimal cutting speeds in free form surface machining. And, to improve precision machining, We must execute high speed machining methods to output optimum NC data using developed constant control of cutting speed program after modeling by CAD/CAM. In this paper, a comparison was made of the cutting precision and tool life in conventional cutting and those in connecting rod machining applying the program developed.
전도성을 가지는 탄소나노튜브강화 알루미나복합소재의 마이크로방전가공에서 초음파진동 부가에 의한 가공특성
강명창(Myung-Chang Kang),탁현석(Hyun-Seok Tak),이창훈(Chang-Hoon Lee),김남경(Nam-Kyung Kim) 한국기계가공학회 2014 한국기계가공학회지 Vol.13 No.6
Micro-holes of conductive ceramic are required in micro structures. Micro-electrical discharge machining (Micro-EDM) is an effective machining method since EDM is as process for shaping hard metals and complex-shaped holes by spark erosion in all kinds of electro-conductive materials. However, as the depth of micro hole increases, the machining condition becomes more unstable due to inefficient removal of debris between the electrode and the workpiece. In this paper, micro-EDM was performed to evaluate machining characteristic such as electrode wear, machining time, taper angle, radial clearance with varying voltage and ultrasonic vibration on 10 vol.% Carbon-nanotube reinforced conductive Al₂O₃ composite fabricated by spark plasma sintering in previous research.