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블로우 몰딩 공정에서 분사 압력이 성형 두께에 미치는 영향에 관한 연구
김동환(Dong-Hwan Kim),설상석(Sang-Seok Seol) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
This study analyzed the deformation behavior of the high density polyethylene (HDPE) bottle in the blow molding process. We carried out finite element (FE) simulations using ANSYS Polyflow. First, the axisymmetric model was executed by 2D FE-simulation to determine the change of bottle wall thickness during the molding process. Then, the square model of the bottle was executed by 3D FE-simulation to gauge the effects of gas pressure on the change of wall thickness. The experiment results showed that the FE-simulations were able to upgrade the quality of the HDPE bottle in the blow molding process. These results can be used as guidance in adjusting gas pressure, as well as be extended for further study to determine process parameters such as temperatures, forming velocity, parison shape, etc.
전산해석을 통한 마찰교반용접용 스핀들의 에어베어링 강성 예측 연구
김진우(Jin-Woo Kim),박민성(Min-Sung Park),공석환(Seok-Hwan Kong),설상석(Sang-Seok Seol),김기수(Ki-Soo Kim),정원지(Won-Ji Chung) 한국기계가공학회 2024 한국기계가공학회지 Vol.23 No.2
Recently, as global concerns regarding the environment have surged, changes in material-joining technologies have transpired. Friction stir welding, which is much more environmentally friendly than the existing welding methods, is attracting attention as a new alternative. This paper presents a method for predicting the stiffness using computational analysis when designing a spindle for frictional stir welding by applying air bearings rather than conventional ball bearings. Through fluid analysis, the pressure exerted on the spindle by the air entering through the inlet is calculated. and calculate the 0.005 ㎜. Additionally, the pressure in an eccentric state is calculated. The pressure is converted to stiffness using a formula, the corresponding stiffness is applied to the spindle, and the radial load generated during friction is input at the end of the spindle. Finally, a structural analysis is conducted to determine whether the stiffness is sufficient to determine the feasibility of the design.
중심합성계획법을 이용한 노후 플래너 밀러 주축 스핀들의 역설계에 관한 연구
김홍록(Hong-Rok Kim),정원지(Won-Jee Chung),설상석(Sang-Seok Seol),홍대선(Dae-Sun Hong),공석환(Seok-Whan Gong),이현준(Hyun-Jun Lee),이성원(Seong-Won Lee) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.3
Whereas the necessity for recycling and reuse is being emphasized owing to the depletion of resources and waste disposal problems caused by the continuous development of the industry, the importance of remanufacturing has been highlighted recently. Re-manufacturing involves a series of processes in which failed disposal or aging goods are recovered to a state similar to that of a new product. In this regard, machine tools, which are large structures, can achieve the effect of remanufacturing. Among the various elements constituting the machine tool, the main spindle portion that affects the processing precision is critical. Therefore, this study is conducted to derive improvement measures for the main axis of an old Miller planner via reverse engineering and central composite design, which is one of the core processes of remanufacturing.
유연 다물체 동역학 해석을 이용한 4축 이적재 로봇의 주요 부품 선정
박일환(Il-Hwan Park),고아라(A-Ra Go),설상석(Sang-Seok Seol),홍대선(Dae-Sun Hong) 한국기계가공학회 2022 한국기계가공학회지 Vol.21 No.2
Among the various industrial robots, palletizing robots have received particular attention because of their higher productivity in accordance with technological progress. When designing a palletizing robot, the main components, such as the servo motors and reducers, should be properly selected to ensure its performance. In this study, a practical method for selecting the motors and reducers of a robot was proposed by performing the dynamic analysis of rigid-flexible multibody systems using ANSYS and ADAMS. In the first step, the links and frames were selected based on the structural analysis results obtained from ANSYS. Subsequently, a modal neutral file (MNF) with information on the flexible body was generated from the links and frames using modal analysis through ANSYS and APDL commands. Through a dynamic analysis of the flexible bodies, the specifications of the major components were finally determined by considering the required torque and power. To verify the effectiveness of the proposed method, the analysis results were compared with those of a rigid-body model. The comparison showed that rigid–flexible multibody dynamic analysis is much more useful than rigid body analysis, particularly for movements heavily influenced by gravity.
최영휴(Young-Hyu Choi),김수태(Soo-Tae Kim),설상석(Sang-Seok Seol),문성춘(Sung-Choon Moon) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.4
In this study, a response spectrum analysis of an electric distributing board (EDB) was conducted to investigate seismic integrity in the design stage. For the seismic analysis, the required response spectra of a safe shutdown earthquake with 2% damping (RRS/SSE-2%) specified in GR-63-CORE Zone 4 was used as the ground spectral acceleration input. A finite element method modal analysis of the EDB was also performed to examine the occurrence of resonance within the frequency range of the earthquake response spectrum. Furthermore, static stress caused by deadweight was analyzed. The resultant total maximum stress of the EDB structure was calculated by adding the maximum stresses from both seismic and static loads using the square root of the sum of the squares (SRSS) method. Finally, the structural safety of the EDB was investigated by comparing the resultant total maximum stress with the allowable stress.
박일환(Il-Hwan Park),전용재(Yong-Jae Jeon),고아라(A-Ra Go),설상석(Sang-Seok Seol),홍대선(Dae-Sun Hong) 한국기계가공학회 2020 한국기계가공학회지 Vol.19 No.12
The demand for industrial robots is proliferating with production automation. Industrial robots are used in various fields, such as logistics, welding, and assembly. Generally, six degrees of freedom are required to move freely in space. However, the palletizing robot used for material management and logistics systems typically has four degrees of freedom. In designing such robots, their main parts, such as motors and reducers, need to be adequately selected while satisfying payload requirements and speed. Hence, this study proposes a practical method for selecting the major parts based on dynamic analysis using ADAMS. First, the acceleration torques for the robot motion were found from the analysis, and then the friction torques were evaluated. This study introduces a constant-speed torque constant instead of friction coefficient. The RMS torque and maximum power of each motor were found considering the above torques. After that, this study recommends the major specifications of all motors and reducers. The proposed method was applied to a palletizing robot to verify the suitability of the pre-selected main parts. The verification result shows that the proposed method can be successfully applied to the early design stage of industrial robots.