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RISS 인기검색어
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- 저자 : 이춘만(Choon-Man Lee) (검색결과 268 건)
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이춘만(Choon-Man Lee),이정학(Jeong-Hak Lee),정호인(Ho-In Jeong),이정훈(Jeong-Hun Lee) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.2
In recent years, the machine industry has demanded high precision of the processed products and high efficiency of production due to the rapid development of technology. The grinding machine is being studied in many countries. The typical grinding machine is processed in the order of one side each. However, a 2-head simultaneous grinding machine processes both sides at the same time. Therefore, it has reduced processing time and improved precision. In this study, the overall structural analysis of a 2-head simultaneous grinding machine with high precision and high efficiency of productivity was performed. For high precision of the 2-head simultaneous grinding machine, the spindle taper angle was analyzed and optimized. When the spindle taper angle was 16 degrees, it had the highest chucking force. Therefore, the spindle had high precision as the spindle taper had the strongest force to chuck the collet. The analysis results can be applied to further develop the 2-head simultaneous grinding machine.
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이춘만(Choon-Man Lee),노영화(Young-Hwa Roh),박동근(Dong-Kun Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
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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이춘만(Choon Man Lee),신성우(Sung Woo Shin),정종윤(Jong Yun Jung),황영국(Young Kug Hwang),박수현(Su Hyun Park) 한국생산제조학회 2006 한국공작기계학회 춘계학술대회논문집 Vol.2006 No.-
At present, industries 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 evaluating the cylindricity for the turning process of SM45C. To reach this goal, several cylindrical-outer-diameter turning experiments are carried out by fluid cutting, MQL cutting and dry cutting. Also, the temperature of the tool-shank and cylindricity of workpiece are measured. It is found from the results of experiments that the cylindricity in MQL cutting is better than the others.
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이춘만(Choon Man Lee),임상헌(Sang Heon Lim) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.5
A cam profile CNC grinding machine is developed for manufacture of high precision contoured cam. The grinding head part of the developed machine should be moved with a certain velocity during grinding of object materials. The grinding head part is moved by ball screw, and sustained by hydrostatic bearing system. In this paper, structural and modal analysis for the CNC grinding machine is carried out to check the design criteria of the machine. The analysis is carried out by FEM simulation using the commercial software, CATIA V5. The machine is modeled by placing proper shell and solid finite elements. And also, a fictitious mass properties was used for the analysis of the machine. Finally, the machine was successfully developed by the results.
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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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