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마이크로 엔드밀링시 공구 변형이 가공오차에 미치는 영향에 관한 연구
서태일,손종인,이학용,Seo, Tae-Il,Sohn, Jong-In,Lee, Hak-Yong 한국생산제조학회 2009 한국생산제조학회지 Vol.25 No.4
Micro end-milling has been becoming an important machining process to manufacture a number of small products such as micro-devices, bio-chips, micro-patterns and so on. Many related researches have given grand effects to micro end-milling phenomenon, for example, micro end-milling mechanism, cutting force modeling and machinability. This paper strongly concerned actual problem, micro tool deflection, which causes excessive machining errors on the workpiece. Machining error were predicted and measured through a series of test micro cutting and analysis of their SEM images and FEM analysis. Experiments are carried out to validate the approaches.
박준식,서태일,배종석,윤길상,Park, Joon-Sik,Seo, Tae-Il,Bae, Jong-Suk,Yoon, Gil-Sang 한국생산제조학회 2006 한국생산제조학회지 Vol.15 No.3
Existing orthopedic implants such as pedicle screw and spinal cage were designed to fix the spinal structure. But, nowadays, physicians want to rehabilitate there original functions. To achieve this request, we studied micro-movable structure for interspinous. As a first step, we designed interspinous structure by 3D CAD to join each spinous processes. Next, we simulate it with various factors such as the thickness of micro-movement structure and the design of clip. At last, we performed static compressive test to satisfy the failure load of 339N and dynamic endurance test of 1.2M cycle. As a result, we developed interspinous implant and did several surgery to evaluated its satisfaction.
유한요소법을 이용한 마이크로 평엔드밀링에서의 공구변형 예측
임정수,조희주,서태일,Lim, Jeong-Su,Cho, Hee-Ju,Seo, Tae-Il 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.6
The main purpose of this study strongly concerned micro machining error estimation by using FEM analysis of tool deflection shapes in micro flat end-milling process. For the precision micro flat end-milling process, analysis of micro cutting errors is mandatory. In general, tool deflection is a major factor which causes cutting error and limits realization of the high-precision cutting process. Especially, in micro end-milling process, micro tool deflection generates very serious problems in contrast to macro tool deflection. Methods which deal with compensation of cutting error by tool deflection in macro end-milling process have been studied plentifully but, few researches transact with micro scaled cutting tool deflection in micro cutting process. Therefore, the trend of micro tool deflection was estimated by using FEM analysis in this paper. Cutting forces were acquired by micro dynamometer and these were utilized in FEM analysis. In order to verify FEM analysis results, micro machining processes were carried out and real machined profiles were compared with FEM results. Finally through the proposed approach well suited FEM results were obtained.