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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 19, Issue 6 - Dec 2010
Volume 19, Issue 5 - Oct 2010
Volume 19, Issue 4 - Aug 2010
Volume 19, Issue 3 - Jun 2010
Volume 19, Issue 2 - Apr 2010
Volume 19, Issue 1 - Feb 2010
Selecting the target year
i 매뉴팩처링 추진전략
Hong, Won-Pyo ; Sin, Jeong-Hun ; Choe, Yeong-Jae ; Choe, Heon-Jong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 5~10
비즈니스 프로세스 기반의 협업혀브 2.0
Kim, Bo-Hyeon ; Jeong, So-Yeong ; Kim, Hyeon-U ; Lee, Seok-U ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 11~18
협업 기능의 분석 및 재구성 방안
Ryu, Gwang-Yeol ; Lee, Sang-Il ; Mok, Hak-Su ; Hong, Won-Pyo ; Choe, Heon-Jong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 19~25
Coupled Flexible Multi-Body Dynamics and Controller Analysis of Machine Tool
Kim, Dong-Man ; Kim, Dong-Hyun ; Park, Kang-Kyun ; Choi, Hyun-Chul ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 307~312
In this study, advanced computational technique for mechatronic analysis has been developed for the efficient design and test of typical machine tool models. Flexible multi-body dynamic (FMBD) analysis method combined with motion controller including control logics is used to simulate typical operation conditions. The present FMBD machine tool model is composed of flexible column structure, rigid body spindle, vertical motion guide (arm) and screw elements. Driving motor clement with rotating degree-of-freedom is interconnected and governed by the designed Matlab Simulink control logic, and then the position of the spindle is feedback into the control logic. It is practically shown from the results that the investigation of designed machine tools with controller can be effectively conducted and verified.
Tool Geometry Optimization and Magnetic Abrasive Polishing for Non-ferrous Material
Kim, Sang-Oh ; You, Man-Hee ; Kwak, Jae-Seob ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 313~320
The magnetic abrasive polishing (MAP) process is used to achieve the nano-meter grade polishing results on flat or complicated surface. In previous study, polishing the stainless steel plate which is a non-magneto-material was tried. To polish non-magneto-materials using the MAP process was very difficult because the process was fundamentally possible by the help of a magnetic force. Therefore, it had lower efficiency than magneto-materials such as SM45C. In this study, optimization for tool geometry of the MAP was performed to improve the magnetic force between tool and workpiece. Moreover, a permanent magnet was installed below the non-magneto-material to improve the magnetic force. And then the design of experiments was carried out to evaluate the effect of the MAP parameters on the polishing results.
Fatigue and Vibration Analysis on Engine Parts
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 321~325
This study analyzes the results with the simulation of heat transfer, structural stress, fatigue and vibration on main parts of engine. The maximum temperature is shown by
on the upper part of piston with the heat transfer. Maximum total deformation or equivalent stress is shown by 65.31mm or 21364MPa respectively at the upper plane of piston with the structural analysis inclusive of heat transfer. The minimum life is shown by the cycle less than
at the part of crankshaft with the fatigue analysis. The frequency with the maximum amplitude of deformation is shown by 14Hz. Maximum total deformation or equivalent stress is shown respectively by 93.99mm on the upper plane of piston or 42625MPa at the part connected with crack shaft and connecting rod at 14Hz. The durability of engine design can be verified by using the analysed result of this study.
A Study on the Fracture Behavior of Laminated Carbon/Epoxy Composite by Acoustic Emission
Oh, Jin-Soo ; Woo, Chang-Ki ; Rhee, Zhang-Kyu ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 326~333
In this study, DAQ and TRA modules were applied to the CFRP single specimen testing method using AE. A method for crack identification in CFRP specimens based on k-mean clustering and wavelet transform analysis are presented. Mode I on DCB under vertical loading and mode II on 3-points ENF testing under share loading have been carried out, thereafter k-mean method for clustering AE data and wavelet transition method per amplitude have been applied to investigate characteristics of interfacial fracture in CFRP composite. It was found that the fracture mechanism of Carbon/Epoxy Composite to estimate of different type of fractures such as matrix(epoxy resin) cracking, delamination and fiber breakage same as AE amplitude distribution using a AE frequency analysis. In conclusion, the presented results provide a foundation for using wavelet analysis as efficient crack detection tool. The advantage of using wavelet analysis is that local features in a displacement response signal can be identified with a desired resolution, provided that the response signal to be analyzed picks up the perturbations caused by the presence of the crack.
Development of Miniaturized High-Speed Air Spindle for Micro-Meso Components
Lee, Seung-Jun ; Shin, In-Dong ; Cha, Sao-Chang ; Kim, Yong-Woo ; Lee, Jong-Ryul ; Lee, Deug-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 334~339
The development of high-speed spindle have been studied extensively for micro machining in advanced industrial countries. The research of miniaturized high-speed air spindle is important part which needs for the micro machining process of high quality. So, This study was to carry out results about design characteristics of miniaturized high-speed air spindle. We had designed 4type turbines and shaft. They were simulated in use the computer simulation programs. We made them as products. They measured RPM (revolutions per minute). As a result of experiments, there was a contrast among 4type Turbines. it reached 384,000rpm in 4.5bar of air pressure. And, We tried to compare the results of measurement whit the results of computer simulation.
A Study on Chatter Stability of High Speed Spindle
Shin, Seong-beom ; Lee, Hyun-Hwa ; Kim, Ji-S. ; Kim, Ji-Yong ; Yang, Min-Yang ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 340~345
This paper presents the chatter stability lobes of high speed spindle of five-axis machine tools. Using a FEM, we obtained the frequency response function of a spindle and the stability lobes for evaluation of chatter. In addition, this paper suggest FRF using by FEM for the prediction of chatter stable region and critical cutting depth. Therefore, critical cutting depth of is 1.3586mm and X, Y direction's chatter frequency is 901Hz and 900Hz, respectively.
An Analysis of Static and Dynamic Behavior of the HSK Tooling System According to Bearing Characteristics
Park, Jin-Hyo ; Kim, Jeong-Suk ; Ku, Min-Su ; Kang, Ik-Soo ; Kim, Ki-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 346~352
Recently, the high-tech industries, such as the aerospace industry, the auto industry, and the electronics industry, are growing up considerably. Because of that, high machining accuracy and productivity of precision parts have been required. The tooling system is important part in the machining center. HSK tooling system is more suitable than BT tooling system for that of high speed machining center. It is because static stiffness and machining accuracy of HSK tooling system are higher than those of BT tooling system. In this paper, static and dynamic behavior of the HSK tooling System is analyzed according to bearing characteristics and lightweight parts. In order that, three different models of the HSK tooling system are modelled by using a 3D modeling/design program. More stable one in the models of HSK tooling system can be selected by using the FEA(Finite Element Analysis).
Intermittent Strip Stock Advancing Accuracy Analysis of a Prototype Pneumatic Cylinder Driven Roll Feeder
So, Jung-Duck ; Kwon, Soon-Hong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 353~358
This research introduces a new and improved design for a pneumatic cylinder driven roll feeder wherein each of the principal rotating feeder parts is configured so as to have feeding accuracy and to be low manufacturing cost. The feed pitch accuracy of the proposed roll feeder was evaluated by measuring lengths of cut offs of the strip stock with a shear attached to an air press. The air press was designed, manufactured, and mounted on the same table of the proposed roll feeder such that the strip stock maintained horizontal plane until the strip stock entered into the shear. The proposed roll feeder and the air press were designed to be operated automatically by a PLC employed controller. The feed pitch accuracy of the proposed roll feeder was analyzed by setting the pitch as 10, 12.5, and 15mm. At each predetermined feed pitch, the proposed roll feeder was tested 300 times as one test set and replicated three times. The average lengths of the cut offs of the strip stock ranged from 9.98 to 10.13mm, from 12.42 to 12.57mm, and from 14.96 to 15.06mm at the predetermined 10, 12.5, and 15mm feed pitch, respectively, among the total of 900 samples of each feed pitch. Main cause of variation of the length of the cut off of the strip stock fed by the proposed roll feeder was considered to be fluctuation of the air press during recompressing period of the air compressor to pressurize the air in the air tank. The largest difference between the maximum and the minimum length of the cut off was appeared while the air compressor recompressing the air. The air compressor used for this study restricted the air delivered to the proposed roll feeder while it was still running. Thus, this air delivery restriction problem should be improved by stabilizing the air press while the proposed roll feeder is running.
A Study of the Fatigue Crack Propagation Behavior According to the Moment Change using Infrared Thermography
Kim, Kyeong-Suk ; Jung, Hyun-Chul ; Pack, Chan-Joo ; Jung, Duk-Woon ; Chang, Ho-Sub ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 359~364
The objective of this study is to propose an effective method for measurement and analysis of fatigue crack. A technique that can measure the statue of fatigue crack propagation fast and correctly for enhancing safety of constructions and securing reliability is necessary. Moreover, the crack propagation behavior characteristics evaluation technique has to be developed using this technique. In this paper, fatigue crack was caused via the fatigue experiment with repeated load on the CT specimen that is made up of STS304. Fatigue crack propagation was measured by tracing the position of the maximum temperature according to the cycles using infrared thermography. The crack growth characteristics was evaluated by applying the moment values on the measuring area to the measured value. As a result of this study, the possibility that the infrared thermography could be applied to measure the fatigue crack was identified. Moreover, it was identified that fatigue crack propagation have a relationship with the moment value of construction.
Analysis of Heat Transfer of a Magnetic Fluid Seal
Kim, Ock-Hyun ; Lee, Hee-Bok ; Lee, Min-Ki ; Hong, Jeong-Hui ; Kwak, Yong-Woon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 365~369
Magnetic fluid seal is characterized by its simple design, low friction and being dustless. Those advantages are deduced from the fact that the sealing element is not a solid such as rubber or plastic but it is a fluid. Those are critical for application to a rotating shaft which is inserted into a vacuum chamber where high level of vacuum and cleanness are required. For the reason the magnetic fluid seal has become a standard for vacuum chambers for semiconductor and LCD processing. It should be noted that its sealing performance is sensitive to temperature. If necessary, water cooling should be considered. Thus anticipation of the temperature distribution of the magnetic fluid seal is important before applying it. In this paper an FEM analysis of the heat transfer has been executed and compared with experimental results. An overall convective heat transfer coefficient has been adopted for the analysis, which results in satisfactory consistency of the theoretical and experimental results.
Electrochemical Machining of Tungsten Carbide Microshaft
Lee, Kang-Hee ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 370~375
Tungsten carbide microshaft is used as micro punch, electrode of micro electro discharge machining, and micro tool because of its high hardness and rigidity. In this research, tungsten carbide microshaft was fabricated using electrochemical machining.
solution was used as the electrolyte because it can dissolve tungsten carbide and cobalt simultaneously. Experimentally studied were the effects of electrolyte concentration, machining time, and machining voltage on material removal rate and the shape of the microshaft. To eliminate the effects of bubbles and metal corrosion layer on microshaft shape, the machining was performed below the electrolysis voltage. Three step electrochemical process was suggested to fabricate the straight tungsten carbide microshaft. As a result, a straight tungsten carbide microshaft of
in diameter and
in length was obtained through the proposed three step electrochemical process.
Durability and Stress Analysis On Automotive Lower Arm
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 376~380
The capability of automotive suspension system depends on steering safety of knuckle and lower control arm. In this study, light weight is applied with lower arm by the material of aluminium alloy. Distributed stress, fatigue life and proper vibration are analyzed with multiple loads happened by automobile. The durability of lower arm can be verified by the result of structural analysis.
Influence of fixed pressure on the machining accuracy of inner diameter of hollow shaft
Jeon, Young-Seog ; Jang, Sung-Min ; Kang, Shin-Gil ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 381~387
This paper presents a study of the influence of fixed pressure in turning. The effect of roundness error and diameter deformation were studied with respect to the fixed pressure applied inside the cylindrical work piece made by boring tool in CNC lathe. The boring tool used in this study is a tungsten carbide coated. The material of workpiece is SM45C and the machining method is dry cutting. Cutting conditions as cutting speed, feed rate and depth of cut are constant. Finally, the change of fixed pressure had influence on the roundness error and diameter deformation.
A study on physical and chemical properties of chalcogenides for an aspheric lens
Ko, Jun-Bin ; Kim, Jeong-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 388~393
In recent years the research has been focused on the preparation of special glasses, i.e., chalcogenide and heavy metal oxide ones that can transmit optical radiation above 2 um and also other optical parameters exceed those of silica based glasses. The attention in this paper is focused on chalcogenide glasses, on preparation of high quality base glass, for an application in infrared optical product design and manufacture. The amorphous materials of As-Se and Ge-As-Se chalcogenides were prepared by a standard melt-quenching technique. The compositions were mesaured by ICP-AES and EPMA, and structural and thermal properties were studied through various annealing processes. Several anomalies of glass transition and crystallization were observed in the DSC/DTA/TG results of the chalcogenide glass.
Backstepping Control-Based Precise Positioning Control Using Robust Friction State Observer and RFNN
Yeo, Dae-Yeon ; Han, Seong-Ik ; Lee, Kwon-Soon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 394~401
In this article, we investigate a robust friction compensation scheme for the purpose of accomplishing precision positioning performance a servo mechanical system with nonlinear dynamic friction. To estimate the friction state and tackle robustness problem for uncertainty, a RFNN and reconstructed error compensator as well as a robust friction state observer are developed. The asymptotic stability of the series of friction compensation methodologies are verified from the Lyapunov's stability theory. Some simulations and experiments on a servo mechanical system were carried out to evaluate the effectiveness of the proposed control scheme.
The Effects of Ultrasonic Vibration on Surface Finish in Nano-second Laser Machining
Kang, Bong-Chul ; Kim, Gun-Woo ; Cho, Sung-Hak ; Park, Jong-Kweon ; Yang, Min-Yang ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 402~406
Conventionally, the machined surface roughness in nano-second(ns) laser machining is damaged and rough due to thermal effects. To obtain the improved surface finish, the ultrasonic vibration is applied to ns-laser machining. The ultrasonic vibration jig is developed to apply the ultrasonic high precision motion to workpieces. And then the ns-laser machining is conducted to compare the effects of the ultrasonic vibration. The results show that the surface roughness with ultrasonic vibration is smoother than that without the vibration. The phenomenon could be explained as enhancement of heat transfer by ultrasonic vibration.
Stamping Tool Wearing Analysis by Time-Frequency Analysis
Lee, Chang-Hee ; Han, Ho-Young ; Seo, Geun-Seok ; Kim, Yong-Yun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 407~413
This paper reports on the research which analyzes acoustic signals acquired in progressive compressing, hole blanking, and burr compacting process. An acoustic sensor was set on the bed of hydraulic press. Acoustic signal is generated from progressive stamping process. First the signal acquired from the unit process; compressing, blanking or compacting, is studied by Fourier Transform and Short Time Fourier Transform. The blanking process emitted ultrasonic signal with more than 20kHz, but the compressing and compacting processes emitted acoustic signals with lower than 10kHz. The combined signals periodically acquired right after the tool grinding were then analyzed. 70-80kHz signals appeared in time-frequency domain, but not in the frequency domain, the magnitude of which was related to the tool wear. Short Time Fourier Transform made up for the Fourier Transform in analyzing the emitted signal for stamping process in the ultrasonic domain.
A study on the Character of Brush Deburring Grinding System
Shin, Kwan-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 414~418
Due to the increasing demand for carious methodologies to improve the quality of products were introduced. A Brush the most frequently used type of grinding process is one of the deburring. in order to produce consistent burr shape, various machining conditions have been combined and applied to disk grinding process. Between the workpiece and the grinding disc to earn depends on the angle of the slope has been observed. Drastic increase of tool wear has been also observed along the inclination angle variation. Various burr shapes have been captured and analyzed using image processing technique.
Design of High frequency Vibration Mechanism with PZT actuator for Ultraprecision Laser Machining
Kim, Hyun-Uk ; Hwang, Dong-Hyun ; Park, Jong-Kweon ; Cho, Sung-Hak ; Lee, Moon-G. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 3, 2010, Pages 419~425
To machine the micro hole, laser machining system is widely used, however, the system cannot fabricate the micro hole with high aspect ratio and good surface finish. To break the obstacles, the high frequency vibration mechanism with PZT (Piezoelectric Transducers) is proposed in this paper. The mechanism will vibrate the laser beam in vertical direction so that the aspect ratio and surface finish may be higher than the conventional. The mechanism vibrates the eyepiece of laser optics. In addition to the benefits, the mechanism enables us to have high precision and flexibility. It decreases burr and debris during machining. And it is able to machine various materials of workpiece. This research include high frequency and large travel range of the proposed mechanism. The PZT motion of mechanism and analysis on the sensitivity of design parameters are extracted from a finite element method (FEM) simulation. In the analysis, the target vibration mode without parasitic motion is designated to have the target frequency and high amplitude.