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Development of Subminiature Type 3 Composite Pressure Vessel for Cooling Unit in Electric Appliances
Sung-Min Cho(조성민),Seung-kuk Lee(이승국),Jong-sam Moon(문종삼),Sung-ki Lyu(류성기) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
In this study, we have developed a composite pressure vessel that is compact and can store refrigerant at high pressure to increase the refrigerant volume. The composite pressure vessel is made of aluminum-based duralumin, which has high rigidity and excellent elongation in the inner liner, considering the characteristics of products in the aerospace and defense industry, where the safety of the applied product is considered as a priority. High strength carbon fiber was applied to the outside. In order to evaluate the performance of the developed product, burst test and cycling test were carried out. In burst test, an excellent safety margin equivalent to 2.7 times the operating pressure was obtained. In cycling test, a stable failure mode in which "pre-burst leak" occurs is proved and the soundness of the product is proved.
류성기,전형주,Lyu, Sung-Ki,Jeon, Hyung-Ju 한국정밀공학회 1995 한국정밀공학회지 Vol.12 No.12
This paper descrived housing design in conception of dynamic characteristics. The vibration and noise in power train system of automobile are important on the environment matter. The vibration caused by meshing teeth of gear is transmitted to the gear box faces through shafts and bearings. Shape of housing is used different radius of curvature(R=0 to 80 mm). The velocity responese, sound power and radiation efficency on the surface of gear box are calculated. The sound power and radiation efficency are compared with different radius of curvature.
류성기,신귀수,Lyu, Sung-Ki,Shin, Gue-Su 한국정밀공학회 1995 한국정밀공학회지 Vol.12 No.12
Straight belvel gear is used mainly for steering system, final reduction and differential gear in the automobile. The more high load, high velocity driving bevel gear, the more unsafe and unpleasant. In thid study, we get a kinematic equation by modelling straight bevel gear pair with simple elastic system, the dynamic characteristic analysis about this system, we got the dynamic load factor of tooth surface. Comparing the value of dynamic load factor by calculation with the measured value of Terauchi's experimental results is similar. We think it useful to analysis the vibration and the noise of straight bevel gear in operation with the analytic method of dynamic load of straight bevel gear using in this study.
Development of Hydraulic Compressor for Hydrogen Station
Sung-Min Cho(조성민),Gyeong-gil Roh(노경길),Ji-woong Yeom(염지웅),Seung-kuk lee(이승국),Sung-ki Lyu(류성기) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.6
Major producers have already built compressors since World War I and have been monopolizing all domestic and overseas markets based on the accumulated technology, and the dependency of the manufacturers over the entire industry is deepening. Therefore, it is expected that the technological gap with developed countries will be larger without development of the related technology. Therefore, it is necessary to develop a unique technology for a new type of high efficiency compression system. In this study, we present localization of Hydraulic Compressor which can meet the technical trends such as cost reduction, efficiency improvement, environmental friendliness, wide operating range, low capacity / high capacity compatibility, size reduction, easy operation and easy maintenance.
A Study on Monitoring Drilling using Torque from Main Spindle Based on PLC in CNC Machine Tools
Sang-hwan Yoon(윤상환),Sung-min Moon(문성민),Sung-ki Lyu(류성기) 한국기계가공학회 2018 한국기계가공학회지 Vol.17 No.3
Drilling processes require a cutting monitoring function that can be analyzed and gives feedback about strange conditions, tool collision and tool wear in real time. In this study, we proposed a drill monitor using the torque from the main spindle in CNC machine tools and a PROFIBUS network as a PLC-based interface. This paper studied drilling torque changes depending on drill size, the repetition cutting of the drilling and the drill"s wear in the same cutting conditions. The material of the drills was high speed steel (HSS) and uncoated. The drills chosen were 2.7 mm, 6.7 mm, and 10.0 mm in diameter. These drills were selected because they had basic holes for their taps.
Development of a Type 4 Composite Cylinder for Self-contained Breathing Apparatus
Sung-min Cho(조성민),Da-eun Kim(김다은),Hye-jin Seong(성혜진),Young-kyu Ko(고영규),Hong-chul Kim(김홍철),Kang-ok Lee(이강옥),Min-sik Jo(조민식),Sung-ki Lyu(류성기) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.12
Aluminum liners used in cylinders are hazardous for human health. In this study, we use a plastic PA liner inside cylinders to solve this problem. Plastic PA liners are widely used in the manufacturing industry in the production of food and beverage containers. We covered the aluminum boss with a plastic liner material and wound the composite fibers over the liner material. To reinforce the dome area, we used low strength / high elongation plastic liner. To predict the performance of the developed product, we conducted structural analyses utilizing the 3D laminated solid element. We verified the soundness of the product by testing the prototype.
류성기(Sung-Ki Lyu),Seizo Uematsu Korean Society for Precision Engineering 2005 한국정밀공학회지 Vol.22 No.4
This study deals with the correction of gear tooth profile error by finish roll forming. First, we experimentally confirmed that the tooth profile error is a synthesis of the concave error and the pressure angle error. Since various types of tooth profile errors appear in the experiments, we introduced evaluation parameters for rolling gears to objectively evaluate profile quality. Using these evaluation parameters, we clarified the relationship among the tooth profile error, the addendum modification factor (A. M. factor), and the tool loading force. We verified the character of concave error, pressure angle error, tool loading force and number of cycles of finish roll forming by using a forced displacement method. This study makes clear that tool loading force and number of cycles of finish roll forming are very important factors that affect involute tooth profile error. The results of the experiment and analysis show that the proposed method reduces concave and pressure angle errors.