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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.
A Study on the Analysis and Design for a Ball Screw Whirling Machine
이춘만(Choon-Man Lee),문성호(Sung-Ho Moon),김은중(Eun-Jung Kim) Korean Society for Precision Engineering 2017 한국정밀공학회지 Vol.34 No.3
Recently, a high-precision ball screw is an essential part of high-speed machines. However, producing high-precision ball screws has been costly and time-consuming. Nowadays, a whirling machine is used to produce high-precision ball screws efficiently. Rotating multi-tips are used to turn the ball screw in the whirling machine. In this study, a structural analysis was performed by a finite-element method to develop a whirling machine. An improved model of the whirling machine was proposed by the analysis. In addition, a thermal analysis was performed to confirm the thermal stability. The results of the analysis can be applied in order to further develop the whirling machine.
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.
A Study on Shape Optimization of High-Speed Index Table with Hypoid Gear
이춘만(Choon Man Lee),안종욱(Jong Wook Ahn),김동현(Dong Hyeon Kim) Korean Society for Precision Engineering 2015 한국정밀공학회지 Vol.32 No.2
In the recent field of Machining, with the improving efficiency of processing, the index table is a key unit according to the increase of parts in available processing when working with the three axes at the same time. As an essential product of MCT, the index tables effect an influence on product quality of machined parts. Therefore, it is necessary to design the shape of index table with stability, high stiffness, lightweight structure. In this study, the optimal shape of index table was proposed using by design of experiment. The maximum displacement and stress analysis were carried out by using FEM software. The optimized shape was verified by using the statistical software. The results of shape optimization were confirmed that both displacement and stress were reduced in comparison with initial model.