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이태홍(Tae-Hong Lee) 한국기계가공학회 2016 한국기계가공학회지 Vol.15 No.4
Main Spindle System has effect on performance of machine tools and working quality as well as is required of high reliability. Especially, it takes great importance in producing automobiles which includes a large number of working processes. However, main spindle unit in Machine tools are often cases where damage occurs do not meet the design life due to driving in harsh environments. This is when excessive maintenance and repair of machine tools or for damage stability has resulted in huge economic losses. Therefore, this studying propose a method of accelerated life test for diagnosing and prognosis the state of life assessment main spindle system. Time status monitoring of diagnostic data - through the analysis of the frequency band signals were carried out inside the main spindle bearing condition monitoring and fault diagnosis.
Tae Hong Lee(이태홍) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.4
In this study, an experimental and theoretical program were carried out to determine the cutting forces and chip formation at different cutting speeds using a 0.4㎜ nose radius ceramic insert and -7˚ rake angle for non heat-treated AISI 4140 (27HRc) and heat-treated AISI 4140 (45 HRc) steel. The results obtained were compared to show the hardness differences between the materials. The secondary deformation zone thicknesses when comparing the two materials show different physical structure but similar size. These results were also discussed in light of the heat treatment and the effects it had on the machining characteristics of the material. In addition, the Oxley Machining Theory was used to predict the cutting forces for these materials and a comparison made. The predicted cutting performances were verified experimentally and showed good agreement with experimental data.
FIB-SEM 복합 구조물의 정적·동적 정밀도 해석에 관한 연구
이태홍(Tae Hong Lee ),맹희영(Heeyoung Maeng) 한국생산제조학회 2019 한국생산제조학회지 Vol.28 No.1
In order to realize nano processing technology using ion beam, it must be accumulated the design of nano-fabrication system, ion focusing mechanism, measurement technology, fabrication of nano-stage and nano tilting device, and processing technology, etc. In this study, three FIB, FE-SEM, and nano-stage components were stored to design the FIB and FE-SEM systems in an integrated structure with a balanced way. The test specimen adopts a design method for the structure that is connected through the tunnel between the chambers. In order to evaluate the influence of the center of gravity, static analysis, and modal analysis on the static and dynamic accuracy of the combined machine.
이태홍(Tae-Hong Lee),최진우(Jin-Woo Choi) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.3
Recently, demand on machine tools has been increased because the machine and automobile industry is booming. Therefore, the machine tools need to have a high accuracy and productivity. To build a high precision machine tool and increase its productivity, structural analysis needs to be carried out for vibration and stiffness of the machine tool before its detail design. However, it is the fact that many manufacturers of machine tools depend on their know-how about design experience. Therefore, in this paper, the static and dynamic analysis is carried out for evaluating a horizontal CNC lathe and then, applied to its detail design. It is positive that the analysis can lead to reduction of design time and improvement of the quality of the lathe as its design proceeds.
Finite element analysis for dynamic behavior of a machine tool structure fed in open loop control
최진우,이태홍,Choi, Jin-Woo,Lee, Tae-Hong The Korean Society of Manufacturing Technology Eng 2010 한국공작기계학회지 Vol.19 No.5
In this study, a fmite element model was developed for analysis of feeding a structure in open loop control The finite element analysis (FEA) can simulate dynamic behavior of the structure of a machine tool rapidly traveling with a screw feeding driving system. The feeding mechanism was implemented with screw element of the FEA tool used in this study. The procedure was developed for the dynamic transient FEA. First, motion parameters such as jerk and velocity were introduced for the structure to be fed in open loop control When its traveling distance was determined, set-points for the distance were generated based on the motion parameters. The set-points were applied to the FE model constructed for the traveling structure. The FEA was executed and evaluated. In this study, the FEA procedure was applied to the column of a machine tool and the dynamic behavior of the column was evaluated. The FEA helps in evaluation of the motion characteristics of a structure. The convergence time of the structure vibration posterior to feeding termination can be estimated and the stiffness of the flexible structure is also evaluated against jerk, and acceleration. It provides the feeding force which is helpful in selection of the feeding motor.
DSMC(Direct Simulation Monte Carlo)방법을 이용한 마이크로관 내에서의 2 상유동에 관한 연구
이진호,유동훈,이태홍,Lee, Jin-Ho,Ryu, Dong-Hun,Lee, Tae-Hong 대한기계학회 2003 大韓機械學會論文集B Vol.27 No.12
In contrast to the high demand for MEMS devices, microflow analysis is not feasible even for single-phase flow with conventional Navier-Stokes equation because of non-continuum effect when characteristic dimension is comparable with local mean free path. DSMC is one of particle based DNS(Direct Numerical Simulation) methods that uses no continuum assumption. In this paper, gas flow in microchannel is studied using DSMC. Interfacial shear and flow characteristics are observed and compared with the results of gas flow that is in contact with liquid case and solid wall case. The simulation is limited to the case of equilibrium steady state and evaporation/condensation coefficient is assumed to be the same and unity. System temperature remains constant and the interfacial shear appears to be small compared to the result with solid wall. This is because particles evaporated and reflected from the liquid surface form high density layer near the interface with liquid flow.
Finite element analysis for dynamic behavior of a machine tool structure fed in open loop control
Jin Woo Choi(최진우),Tae Hong Lee(이태홍) 한국생산제조학회 2010 한국생산제조학회지 Vol.19 No.5
In this study, a finite element model was developed for analysis of feeding a structure in open loop control. The finite element analysis (FEA) can simulate dynamic behavior of the structure of a machine tool rapidly traveling with a screw feeding driving system. The feeding mechanism was implemented with screw element of the FEA tool used in this study. The procedure was developed for the dynamic transient FEA. First, motion parameters such as jerk and velocity were introduced for the structure to be fed in open loop control. When its traveling distance was determined, set-points for the distance were generated based on the motion parameters. The set-points were applied to the FE model constructed for the traveling structure. The FEA was executed and evaluated. In this study, the FEA procedure was applied to the column of a machine tool and the dynamic behavior of the column was evaluated. The FEA helps in evaluation of the motion characteristics of a structure. The convergence time of the structure vibration posterior to feeding termination can be estimated and the stiffness of the flexible structure is also evaluated against jerk, and acceleration. It provides the feeding force which is helpful in selection of the feeding motor.