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Hyun-seok Lee(이현석),Yeong-min Na(나영민),Hyun-su Jang(장현수),Ik-hyun Suk(석익현),Sin-hyun Kang(강신현),Hun-tae Kim(김훈태),Jong-kyu Park(박종규) 한국기계가공학회 2019 한국기계가공학회지 Vol.18 No.1
In this paper, the stability of the tunnel boring machine (TBM), used in tunnel excavation, according to the thrust force of the thrust jack was investigated. The existing hydraulic cylinder analysis method is fluid-structure interaction (FSI) analysis, where all of the flow setting and dynamic characteristics should be considered. Therefore, there is a need for a method to solve this problem simply and quickly. To facilitate this, the theoretical pressure in the hydraulic cylinder was calculated and compared with the analytical and experimental results. In the case of the analysis, the pressure generated inside the cylinder was analyzed statically, considering the operating characteristics of the shield TBM, and the stress and pressure were calculated. This method simplifies the analysis environment and shortens the analysis time compared to the existing analysis method. The obtained theoretical and analytical data were compared with the measured data during actual tunneling, and the analysis and experimental data showed a relative error of approximately 23.89%.
석익현(Ik-hyun Suk),박종규(Jong-kyu Park) 한국기계가공학회 2021 한국기계가공학회지 Vol.20 No.2
To cater to the transition from single-color to multicolor/multi-material printing, this paper proposes a cartridge-replacing type multi-nozzle Fused Depositon Modeling(FDM) three-dimensional (3D) printer. In the test printing run, tool change failure/wobble/layer shift occurred. It was confirmed that improper support was the cause of this tool change failure. As a solution, spline and electromagnetic cartridges were designed. Wobble was caused by machine vibration and the motor stepping out. To minimize wobble, an additional Z-axis was installed, and the four-point bed leveling method was used instead of the three-point bed leveling method. The occurrence of layer shift was ascribed to the eccentricity of the Z-axis lead screw. Therefore, slit coupler was replaced with an Oldham type. In addition to the mechanical supplementation, the control environment was integrated to prevent accidents and signal errors due to wire connections. Before the final test printing run, a rectifier circuit was added to the motor to secure precise control stability. The final test printing run confirmed that the wobble/layer shift phenomenon was minimized, and the maximum error between layers was reduced to 0.05.
압출 색상 변환이 가능한 3D 프린터의 교체 구동 및 압출 안정화에 대한 연구
장현수(Hyun-su Jang),석익현(Ik-hyun suk),박종규(Jong-kyu Park) 대한기계학회 2020 대한기계학회 춘추학술대회 Vol.2020 No.7
In this paper, a method to ensure cartridge replacement and extrusion stability of 3d printers capable of extruding color exchange is proposed. To this end, the structure and problems of existing cartridges are identified and alternatives are presented. The free curve and electromagnet method were proposed, and the performance was confirmed by replacing and printing tests according to each method.