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        • KCI등재

          절삭중 밀링 공구의 磨滅과 音響放出의 관련성에 관한 硏究

          윤종학,김동성 한국공작기계학회 1995 한국생산제조학회지 Vol.4 No.2

          This study is focused on the prediction of appropriate tool life by clarifying the correlation between progressive tool wear and AE signal, when cutting SM45C by End mill in machining center. First of all, end mill have a problem that position for sensor sticking because it is revolution tool, but I think that it can be gained specific character according to sticking Sensor in the Vice. Consequently, the following results have been obtained: 1. Each cutting speed of feed rate over 0.1mm had a tendency to increase linearly according to the RMSAE. 2. The level of AE signal at the same cutting area was more sensitive to depth of cut tharn the variation of feed rate. 3. In the range of cutting duringqr about 75minqr atqr cutting speed 27m/min flankqr wear trurns up aboutqr 0.21mm, aboutqr 0.29mm in the caseqr of about 65minqr t 33m/min,qr hereby RMSAE increased rapidly at 0.2mm flank wear, also AE-HIT and CUM-CNTS.

        • KCI등재

          공구마멸 감시에 음향방출 신호를 이용하기 위한 연구

          윤종학,여만구,김상헌 한국공작기계학회 1996 한국생산제조학회지 Vol.5 No.3

          This study is focused on the prediction of appropriate tool life by clarifying the correlation between progressive tool wear and AE(Acoustic Emission) signals, while cutting stainless steel by end mill on te machining center. The results of this study were that RMSAE tends to increase linearly along with the incrase of the cutting speed, and it was more sensitive to depth of cut than to the variation of feed rate at the same cutting conditions, and RMSAE increases around 0.21mm flank wear hereby AE-HIT also increases. AE signals depend upon tool wear and fracture from the above results. Therefore, the AE signals can be utilized in order to monitor the tool condition.

        • 토크 컨버터와 복합 유성기어로 구성된 새로운 무단 변속기의 성능 해석

          윤종학,신영재 安東大學校 工業技術硏究所 1997 공업기술연구논문집 Vol.4 No.1

          In this paper, a new continuously variable transmission for automotive and agricultural machine is developed, which is composed of both torque converter and compound planetary gear. To analyze the performance of power-split system, static and dynamic models are proposed and power circulation phenomenon is discovered. Power ratio of each part is compared for various of compound planetary gear ratio in the static model and investigated for various of equivalent inertia in the dynamic model.

        • KCI등재

          AI합금의 고속가공에서 치수오차와 표면정도 추이 고찰

          윤종학,정문섭,이헌철 韓國工作機械學會 2000 한국생산제조학회지 Vol.9 No.3

          High speed machining aims to raise the productivity and efficiency by making more precise and higher value-added products than any other machining method by means of the high speediness of spindle and feed drive system. The purpose of this study is to investigate the effects of the run-out of endmill on the dimension precision of workpiece and to obtain the fundamental data on high speed machining, which is available by machining the side of Al-alloy with solid carbide endmills in high speed machining center and by measuring dimensions and surface roughness. From the results of experimentations followings are obtained ; if spindle speed is ultrahigh in conditions that radial depth of cut and feed per tooth are very small, highly precise and accurate products are to be made efficiently with high feed rate, and so we can raise productivity.

        • 국가직무능력표준(NCS) 기반 인쇄분야 국가기술자격 설계 방안

          윤종학,김재해,소기호,박계영 한국인쇄학회 2017 한국인쇄학회지 Vol.32 No.1

          This study is briefed the national competency standards(NCS) which developed through occupational map analysis in printing fields and the national technical qualifications which were Engineer Printing, Industrial Engineer Printing and Craftsman Printing. And the question for skill test of printing fields was developed by comparing NCS and guideline for question-making. Finally the new system of technical qualification based on printing NCS was designed.

        • SS400강의 엔드밀 가공시 절삭력과 공구 파손에 관한 연구

          윤종학,김윤겸,안병운 서울産業大學校 2002 논문집 Vol.53 No.1

          Operators, work pieces, and machines can be damaged by unexpected tool fracture during cutting a work piece by using end mill. The purpose of this study is to investigate the variation of the cutting force generated during cutting the steel(SS400) by using end mill in the machining center and to check the tool fracture time generated during cutting a work piece and analyze the relationship between cutting force and fracture time, and to find the most proper cutting condition. The experiment was carried out to measure the cutting force generated during upper-milling of straight, convex and concave shaped of work pieces by using a two?blade end mill of 10mm in the machining center. Spindle speed, table speed and the cutting depth were 1060 rpm, 160 mm/min, and 1.5mm respectively. Various spindle speed(850, 950, 1060, 1180, 1320 rpm), table speed(120, 140, 160, 180, 200, mm/min), and the cutting depths(1.1, 1.3, 1.5, 1.7, 1.9 mm) were tired to obtain more proper cutting conditions. The cutting force of concave shaped work piece is largest while that of convex shaped work piece is smallest. The cutting force decreased when the spindle speed increased. And the cutting force increased when the table speed and the cutting depth increased. It was also identified that the tool fracture time increased as the cutting force decreased. In consideration of' the cutting efficiency and tool life time, the most proper cutting condition was achieved when the spindle speed, table speed and the cutting depth were 1010rpm, 163mm/min and 1.55mm respectively.

        • KCI등재

          기후변화에 따른 한반도 사스레피나무의 생육지 예측과 영향 평가

          윤종학,박정수,최종,나카오 카츠히로,Yun, Jong-Hak,Park, Jeong Soo,Choi, Jong-Yun,Nakao, Katsuhiro 한국환경영향평가학회 2017 환경영향평가 Vol.26 No.5

          본 연구는 사스레피나무의 분포를 규정하는 기후요인과 종분포 모델을 이용하여 현재기후와 미래기후에서의 잠재생육지를 분석하기 위해 수행되었다. 4개 기후요인(온량지수, 최한월최저기온, 하계강수량, 동계강수량)은 모델에서 독립변수로 사용하였다. 17개 전지구 기후모델(GCMs; General Circulation Models)에 의한 RCP(대표농도경로) 8.5 시나리오를 2050년(2040~2069)과 2080년(2070~2099)의 미래기후로 사용하였다. 사스레피나무(Eurya japonica)에 대한 종분포 모델은 높은 분포예측 모델로 구축되었다. 사스레피나무의 분포모델에서 최한월최저기온이 사스레피나무 분포를 규정하는 주요 기후요인으로 분석되었다. 최한월최저기온 $-5.7^{\circ}C$이상 지역은 사스레피나무의 높은 출현확률을 나타내었다. 사스레피나무의 잠재 생육지는 2050년과 2080년에서 현재기후에서 보다 각각 2.5배, 3.4배 증가되었으며, 기후변화에 의해 점점 확대될 것으로 판단되었다. 사스레피나무는 한반도에서 기후변화 지표종으로 가능하며, 잠재 생육지를 모니터링 할 필요가 있다. The research was carried out in order to find climate factors which determine the distribution of Eurya japonica, and the potential habitats (PHs) under the current climate and climate change scenario by using species distribution models (SDMs). Four climate factors; the warmth index (WI), the minimum temperature of the coldest month (TMC), summer precipitation (PRS), and winter precipitaion (PRW) : were used as independent variables for the model. Seventeen general circulation models under RCP (Representative concentration pathway) 8.5 scenarios were used as future climate scenarios for the 2050s (2040~2069) and 2080s (2070~2099). Highly accurate SDMs were obtained for E. japonica. The model of distribution for E. japonica constructed by SDMs showed that minimum temperature of the coldest month (TMC) is a major climate factor in determining the distribution of E. japonica. The area above the $-5.7^{\circ}C$ of TMC revealed high occurrence probability of the E. japonica. Future PHs for E. japonica were projected to increase respectively by 2.5 times, 3.4 times of current PHs under 2050s and 2080s. It is expected that the potential of E. japonica habitats is expanded gradually. E. japonica is applicable as indicator species for monitoring in the Korean Peninsula. E. japonica is necessary to be monitored of potential habitats.

        • KCI등재

          머시닝센터에서 볼 엔드밀가공으로 고능률, 고정밀도 제고를 위한 표면가공 조건

          윤종학,이종원,정기영,정문섭 한국공작기계학회 1998 한국생산제조학회지 Vol.7 No.3

          The curved surface machined by plate end mill causes a excess non-cutting volume, in these cases ball end mill is used for the curved surfaces. This study is aimed to obtain the optimum cutting condition by measuring the surface roughness on the conditions of various cutting speed, table speed, tool diameter, radius of curvature when machining the curved surface using the ball end mill. After designing curve rates, obtaining NC data by CAD/CAM system through CC-Cartesian method and transferred the data through DNC system, we machined the specimens by the CNC machining center. The surface roughness of specimens was measured by surface roughness tester and CNC 3D coordinate measuring machine. The cutting condition were the same as follow, velocity ; 15, 20, 25, 30m/min, feed rate ; 40, 60, 80, 100m/min amd redius of curvature ; 30, 40, 50, 60mm, tool diameters ; Φ8, Φ12, Φ16, Φ20mm. Analizing the working results, we can acquire the acquire the optimum cutting condition of curved specimen at the cutting velocity of 20∼25m/min and the feed rate of 80mm/min. As the same cutting condition, the best surface roughness was showed at Φ16mm of the tool diameter. But the tool diameter was smaller than Φ8mm, we could improve for the surface roughness by controlling the cusp.

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