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A Study on the Development of Flattening Process for Burr Removal and Product Evaluation
이춘만(Choon-Man Lee),임종섭(Jong-Sup Lim),김성규(Seong-Gyu Kim),신성우(Sung-Woo Shin) Korean Society for Precision Engineering 2021 한국정밀공학회지 Vol.38 No.3
The plate for the multi-stage reducer is a component of a traveling motor and is required for high wear resistance and maintaining precision. The plates that are mainly manufactured by the press process have burrs on the edges of the material after the general press shear process. Since burrs have a great influence on assembly and shape precision according to product characteristics, a post-treatment process for removing burrs is mandatory, and several studies have been conducted on this topic. In this study, a flattening process was developed to remove the burrs. First, the piercing and blanking process forming analysis was performed to find the process conditions for burr removal. Subsequently, the flattening process forming analysis was performed, and the reliability of the analysis was verified through an experiment using the derived process conditions.
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.
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.
A Study on the Analysis for Development of a Deflector Type Miniature Ball Screw
이춘만(Choon-Man Lee),문성호(Sung-Ho Moon),이영훈(Young-Hun Lee),김준환(Jun-Hwan Kim) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.12
Recently, ball screws have been used in machine tools, robot parts, and medical instruments. The demand for ball screws of high precision and reduced size is increasing because of the growth of high value-added industries. Three types of ball screws are typically used: deflector type, end-cap type, and tube type. They are also classified from C0 to C9 according to the precision level. A deflector type ball screw can reduce the variation of rotational torque and the size of the nut of the ball screw is minimized. To ensure the reliable design of ball screws, it is important to perform a structural analysis. The purpose of this study is to perform a stability evaluation through analysis of a deflector type miniature ball screw for weapon systems. The analysis is performed through Finite Elements Method (FEM) simulation to predict characteristics such as deformation, stress, and thermal effects. The interference between the shaft and the deflector for smooth rotation are also studied. Based on the results of the analysis, the development of the deflector type miniature ball screw for weapon systems is performed.
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.
이춘만(Choon-Man Lee),하재현(Jae-Hyeon Ha),우완식(Wan-Sik Woo),김은중(Eun-Jung Kim) Korean Society for Precision Engineering 2016 한국정밀공학회지 Vol.33 No.12
Recently, the problem of the accumulation of fine sludge from the cutting oil generated during machining processes has become a major threat to the environment. The fine sludge has adverse affects on the human body and the environment, and significantly contributes to marine pollution. However, a microfiltration technique that can process the sludge still needs to be studied and developed on a global scale. Therefore, it is necessary to develop eco-friendly equipment such as an ECO vacuum filter system and eco-friendly technologies for processing cutting oil. In this study, a structural analysis was carried out using a finite element method (FEM). Improved models of the suction chamber for the ECO vacuum filter system were proposed based on the analysis of the displacement and stress of the system. The model with the best result was then optimized using the commercial software, ANSYS. It was confirmed that, in the optimized model, displacement and stress were reduced in comparison with the initial model. Finally, the structural stability of the optimized model was verified through analysis.