http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
The Study on Burr Removal Rate Along the Cutting Radial Distance in U-type Flow Channel
Chul-Bae Son(손출배),Jung-Hee Lee(이정희),Jae-Seob Kwak(곽재섭) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.7
As increasing demand for precise machining in advanced disciplines, especially in semi-conductor, aeronautical and automotive industries, the magnetic abrasive deburring(MAD) which is able to eliminate micro-sized burr on complex surface in less time has drawn the attention in the last decades. However, the performance of MAD is subject to shape and size of a tool. Therefore, this study aim to identify deburring behavior of MAD in U-type flow channel by measuring the length rate of burr removal in radial distance of the cylindrical tool under four process factors. In order to evaluate the deburring effect of MAD on the surface, finishing regions are divided based on center of the circular cutting tool. As a results, it was defined that the amount of burr removal in a downward direction moving toward flow channel from the top surface was higher than upward direction. This is because the magnetic abrasives were detached from magnetic lines of force due to geometrical shape.
자속밀도 가중치에 의한 자유곡면 자기연마 공구곡률 선정
손출배(Chul-Bae Son),유만희(Man-Hee Ryu),곽재섭(Jae-Seob Kwak) 한국기계가공학회 2013 한국기계가공학회지 Vol.12 No.3
During the magnetic abrasive polishing of a curved surface, the improvement in surface roughness varies with the maximum value and distribution of magnetic flux density. Thus, in this study, the magnetic flux density on the curved surface was simulated according to curvature radii of magnetic tool. As a result of the simulation, the 14.5mm of the magnetic tool had a higher maximum magnetic flux density and it showed a large weighted magnetic flux density. The weighted magnetic flux density means the highest value for the magnetic flux density in the curvature of the magnetic tool. From the experimental verification, the better improvement in surface roughness was observed on wider area at the 14.5mm radius of the magnetic tool than other radii.
전해-자기 복합 가공을 이용한 미세 그루브형상의 가공 특성에 관한 연구
김상오(Sang Oh Kim),손출배(Chul Bae Son),곽재섭(Jae Seob Kwak) 대한기계학회 2013 大韓機械學會論文集A Vol.37 No.3
전자기력을 이용한 자기연마 공정은 전통적 가공방식으로 버를 제거하기 힘든 비자성체의 소재 및 마이크로 형상의 가진 제품에 활용될 수 있는 새로운 정밀 디버링 방식이다. 그러나 이러한 자기연마법은 자기연마입자를 이용한 기계적 절삭력을 이용하고 있기 때문에 마이크로 단위의 구조물의 형상을 변형시킬 가능성이 높다. 따라서 본 연구에서는 탄소나노튜브-코발트 금속복합체를 이용한 전해-자기복합가공을 STS316 소재의 미세 그루브의 마이크로 디버링공정에 적용하고 그 특성을 분석하였다. 그 결과 자기연마공정을 적용한 공정에서는 공정 후 그루브에 생성된 버는 효율적으로 제거되었으나 그루브 끝단의 형상변화가 두드러지게 관찰되었다. 반면 전해-자기복합가공을 이용한 경우에는 재료제거율이 낮아 그루브 끝단의 형상변화 없이 디버링 공정이 진행됨을 확인하였다. Magnetic abrasive polishing is an advanced deburring process for nonmagnetic materials and micropattern products that have non-machinability characteristics. Despite these advantages, there are some problems with using MAP for deburring. MAP has introduced geometric errors into microgrooves because of an over-cutting force caused by uncontrolled magnetic abrasives in the MAP tool. Thus, in this study, to solve this problem, an EP (electrolyte polishing)?MAP hybrid polishing process was developed for deburring microgrooves in an STS316 material. In addition, an evaluation of EP-MAP for the deburring of microgrooves was carried out by profiling the burrs. The results of the experiment showed geometric errors after the deburring process using MAP. However, in the case of EP-MAP, no geometric error was observed after the process because of the lower material removal rate in EP-MAP.
AE 신호 분석을 통한 비자성체의 자기연마 모니터링에 관한 연구
신창민(Chang-Min Shin),손출배(Chul-Bae Son),곽재섭(Jae-Seob Kwak) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11
A monitoring system for magnetic abrasive polishing process is necessary to ensure the polishing products the high quality and integrity. Acoustic emission (AE) signal is known to reflect the material removal phenomena in other machining processes. In a case of the magnetic abrasive polishing of non-magnetic materials, application of AE method is very difficult because of lower machining force on the surface of workpiece and the level of AE signal is extremely lower. In this study, AE sensor-based monitoring system is applied to the magnetic abrasive polishing. The relation between the level of the AE RMS and the surface roughness during the magnetic abrasive polishing of magnesium alloy steel is investigated.
전해-자기 복합가공에서 미세패턴의 디버링 공정 최적화에 관한 연구
박창근(Chang-Geun Park),김상오(Sang-Oh Kim),손출배(Chul-Bae Son),곽재섭(Jae-Seob Kwak) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
In this study, an EP(Electro-Polishing)-MAP(Magnetic Abrasive Polishing) hybrid process was applied to removing burr on the micro pattern. A micro pattern fabrication processes are combined with micro milling and EP-MAP hybrid process for deburring. Depending on the micro milling conditions which are applied, micro burrs are formed around the side and top of the pattern. EP-MAP deburring is used to remove these burrs effectively. To optimize removal rate and form error in the EP-MAP hybrid process, design of experiment was performed. The effect of deburring process and form error of micro pattern are evaluated via SEM images and the results of AFM.
마이크로 머시닝에서 공구 정렬과 가공정밀도에 관한 연구
진동현(Dong-Hyun Jin),안주은(Ju-Eun An),김주권(Joo-Kwon Kim),이성호(Sung-Ho Lee),손출배(Chul-Bae Son),곽재섭(Jae-Seob Kwak) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Micro end mill is one of the precise tools, which is used in machining of ultra-precision products such as micro channel, micro patterned mold, and so forth. To satisfy the required precision of these products, many studies were investigated on the cutting force, burr formation, and burr generation mechanism of micro end mill, but there are little studies on the alignment of micro tool even which is the foundation of machining. Hence in this investigation, a simulation on manufacturing of channel with misaligned micro end mill was carried out and its effect was evaluated.