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- 저자 : 이춘만(Choon-Man Lee) (검색결과 264 건)
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이춘만(Choon-Man Lee),황영국(Young-Kug Hwang),정종윤(Jong-Yun Jung) 한국생산제조학회 2004 한국생산제조시스템학회 학술발표대회 논문집 Vol.2004 No.10
At present, industry and researchers are looking for ways to reduce the use of lubricants because of ecological and economical reasons. Therefore, metal cutting is to move toward dry cutting or semi-dry cutting. This paper presents an investigation into MQL(Minimum Quantity Lubrication) machining with the objective of deriving the optimum cutting conditions for the turning process of SM45C. To reach these goals several finish turning experiments were carried out, varying cutting speed, feed rate and oil quantity, with MQL. The surface roughness results of tests were measured and the effects of cutting conditions were analyzed by the method of Analysis of Variance(ANOVA). From the experimental results and ANOVA, it is found that a better surface roughness can be obtained by decreasing oil quantity and feed rate.
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이춘만(Choon Man Lee),최치혁(Chi Hyuk Choi),고태조(Tae Jo Ko),정종윤(Jong Yun Jung),정원지(Won Jee Chung) Korean Society for Precision Engineering 2003 한국정밀공학회지 Vol.20 No.8
High-speed machining is one of the most effective technology to enhance productivity especially for hardened die material. High-speed machining can give great advantages for machining of dies and molds. But selection of machining condition is very difficult because of complicated machining mechanism. This paper presents the selection of machining condition in high-speed machining of STD11. Depth of cut, feed rate and spindle revolution are control factors. The effect of the control factors on surface roughness and machining error in Z-direction is discussed to improve machining accuracy.
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알루미늄 합금 형재의 열간압출 금형 설계 자동화에 관한 연구
이춘만(Choon-Man Lee),송인성(In-Seong Song),정원지(Won-Jee Chung) Korean Society for Precision Engineering 2003 한국정밀공학회지 Vol.20 No.1
This study presents development of a automatic design software for process and die design of hot extrusion of aluminium alloys through square dies. The design of extrusion dies is still an art rather than a science with increasing complexity of shape and thinness of section. Therefore, most of the die design is still dependent on personal judgement, intuition and experience. The objective of this study is to develop a software system which includes a design rule extracted from literatures and experts in the extrusion industry. The developed system is effectively used to design extrusion processes and dies with reduced lead time and trial extrusion.
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이춘만(Choon-Man Lee),안종욱(Jong Wook Ahn) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.2
Various processes have been developed to improve the performance of the lubrication oil pump in a recent automobile industry. In particular, trochoidal profile has been widely used for the lubrication oil pump because it is easy to flow control and a lot of oil feed rate is obtained. Accuracy of the trochoidal profile as a core component of the lubricating oil pump affects the driving performance. So, it is necessary to develop efficient processing of the trochoidal profile. In this study, a machining process for the trochoidal profile is developed by turn-mill. Cutting force, surface roughness and tool wear were evaluated in accordance with machining conditions.
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A Study on the Effect of Gas Flow Rate and Power in Plasma Assisted Machining
이춘만(Choon-Man Lee),이영훈(Young Hun Lee) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.6
Recently, demands for difficult-to-cut materials with high mechanical properties have been increased in various industrial fields, such as the aerospace and automobile industries. Because difficult-to-cut materials have high mechanical properties, it is difficult to achieve conventional machining. Therefore, many researchers have been studying the machining methods for difficult-to-cut materials. One of the many studies of how to cut difficult-to-cut materials involves plasma-assisted machining (PAM) is a machining method that softens difficult-to-cut materials by a plasma heat source to remove by the cutting tool. PAM has various machining conditions, and it is very important to determine the optimal conditions to improve machining accuracy and efficiency. In this study, the cutting force was analyzed by using a gas flow rate and power which are the easiest to control in the PAM system. The results of this study can be applied to PAM data under optimum conditions.
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A Study on the Development of Overload Detecting Pad for Low Speed WIM System
이춘만(Choon-Man Lee),최영호(Young-Ho Choi),김은중(Eun-Jung Kim) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.3
Recently, traffic accidents and damage on the highway have increased because of overloaded vehicles. The existing overload-detecting system has a low accuracy rate. An overload-detecting system using a weigh-in-motion (WIM) system has been developed to solve this problem. The WIM system can be used to detect overloaded vehicles by measuring the weight of the vehicles. The WIM system is divided into high-speed and low-speed types. The inaccuracy rate in the lowspeed WIM system results mainly from the low response rate of the sensor when the velocity is moving at more than 20 ㎞/h. In this study, a low-speed overload-detecting pad with a hydraulic structure using a WIM system was developed to make the system more accurate. The structural and formal analysis was carried out by using a finite element method (FEM) in order to analyze the structural stability and the extrusion velocity of the system. In addition, a static load test was performed to confirm the linearity and accuracy of the pad.
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이춘만(Choon-Man Lee),노영화(Young-Hwa Roh),박동근(Dong-Kun Park) 한국생산제조학회 2006 한국생산제조시스템학회 학술발표대회 논문집 Vol.2006 No.5
This study is concerned about the development and performance evaluation of a tower type ATC(Automatic Tool Changer). Recently, many studies have been undergoing to reduce working time in field of machine center. Tower type ATC have been developed to reduce the stand-by time by shortening tool exchanging time. The developed system can store more number of tools in small space. In order to evaluate the performance of tower type ATC, feeding speed and noise are measured by a laser interferometer and a noise level meter.
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