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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society of Manufacturing Process Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Manufacturing Process Engineers
Editor in Chief :
Volume & Issues
Volume 13, Issue 6 - Dec 2014
Volume 13, Issue 5 - Oct 2014
Volume 13, Issue 4 - Aug 2014
Volume 13, Issue 3 - Jun 2014
Volume 13, Issue 2 - Apr 2014
Volume 13, Issue 1 - Feb 2014
Selecting the target year
Program for technological development of higher industry based industry-university cooperation
Choi, Seong-Dae ; Lee, Mi-Na ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 1~5
DOI : 10.14775/ksmpe.2014.13.3.001
The purpose of this study is to develop a manpower training program of technological development. The types of developed manpower training models are education about the technological development process, literacy education about technological development, and field experience. The education about the technological development process is accomplished through industry-university cooperation based on shared technical concerns. Literacy education about technological development includes information about essential methods for manpower education. Field experience involves the development of effective teaching plans.
Design Modifications of a Glass Cutting Machine for the Improved Stability
Kwon, In-Hwan ; Ro, Seung-Hoon ; Park, Yu-Ra ; Yi, Il-Hwan ; Kil, Sa-Geun ; Park, Keun-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 6~14
DOI : 10.14775/ksmpe.2014.13.3.006
Touch panels are widely used in the modern display industry as the cover glass of smart mobile phones and tablet PCs. Glass cutting machines are commonly used to cut the panels into their proper sizes. Vibration of these glass cutting machines is assumed to be the main factor leading to the creation of burrs, notches, cracks, scratches and chips on the cut surfaces, eventually causing defects of the cover glass. In this study, the vibrations of a glass cutting machine used for the shearing of cover glass components were analyzed through an experiment and a computer simulation. The structural properties leading to vibration were also analyzed in an effort to determine design alterations which can suppress these vibrations. Moreover, each design alteration was applied to a computer simulation model to determine the effect of different alteration on suppressing vibration. The results show that simple design alterations can substantially suppress vibrations of glass cutting machines.
A Monitoring System for Solar Street Lights Using Mobile Devices
Yang, Minhyeok ; Oh, Byoung-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 15~21
DOI : 10.14775/ksmpe.2014.13.3.015
The utilization range of mobile devices is becoming broader than before due to the rapid development of the mobile market. Furthermore, the demands for computer-aided management are increasing due to the extensive expansion of the installation of solar street lights. In this paper, we propose a system which can be used to observe solar street lights. The manager of the system can control and manage the solar street lights using video images on a mobile device.
Synthesis of nanosized MFI zeolite using TEOS and TPAOH precursors
Bae, Hye Jin ; Choi, Byung Ho ; Cho, Seong Hoon ; Won, Soo Hyun ; Lee, Bo Kyung ; Ok, Hae Ryul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 22~27
DOI : 10.14775/ksmpe.2014.13.3.022
Nanosized zeolite was prepared in an autoclave at a hydrothermal temperature range of 100 to
. In TEM and particle-size analyses, the size of the nanosized powders was found to be 10-300 nm, and its distribution is uniform and spherical, depending on the hydrothermal temperature. XRD confirms that the nanosized powder is MFI zeolite.
Trajectory Tracking Control for Two Wheeled Mobile Robot using Fuzzy Sliding Mode Control based Hyperbolic Function
Lim, Jong-Uk ; Lee, Sang-Jae ; Chai, Chang-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 28~34
DOI : 10.14775/ksmpe.2014.13.3.028
In this paper, we propose a trajectory tracking controller for a two-wheeled mobile robot (WMR) with nonholonomic constraints using a fuzzy sliding-mode controller-based hyperbolic function. The proposed controller is composed of two separate controllers. The sliding-mode controller is used for attitude control of the WMR, and the fuzzy controller-based hyperbolic function is designed to adjust the reach time of the sliding-mode control. Simulation results on a linear and a circular trajectory show that the proposed controller improves the control performance. The proposed controller reduces the reach time by as much as 47% compared to the controller proposed by Xie et al.
Fabrication of Poly(γ-glutamic acid) Porous Scaffold for Tissue Engineering Applications
Jeon, Hyeon Ae ; Lee, Seung Wook ; Kwon, Oh Hyeong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 35~41
DOI : 10.14775/ksmpe.2014.13.3.035
Poly(g-glutamic acid) (g-PGA) is a very promising biodegradable polymer that is produced by microorganism of Bacillus subtilis. Because g-PGA is water-soluble, anionic, biodegradable, and even edible, its potential applications have been studied from an industrial standpoint. In this study, we fabricated porous g-PGA foams by means of a freeze-solvent extraction method for tissue-engineering applications. Porous g-PGA foams were chemically cross-linked using a hexamethylene diisocyanate solution. An aqueous basic solution was used to neutralize g-PGA foam for cell culturing. During an in vitro cell culture study, it was observed that primary rabbit ear chondrocytes were well at tached and spread over the surface oft hree-dimensional cross-linkedg-PGA foam. From these results, it is concluded that cross-linkedg-PGA foam is aprom is in gmaterial for tissue-engineering applications, especially those pertaining to the regeneration of human cartilage.
A Study on the Structural Integrity of an Auxiliary Feed Water Pump in a Nuclear Power Plant
Kim, Chae-Sil ; Cho, Bang-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 42~48
DOI : 10.14775/ksmpe.2014.13.3.042
The auxiliary-feed-water pump (AFWP) used to supply water during a station black out situation at nuclear power plants should meet the seismic qualification regulations stipulated in IEEE Std 323 and 344, so as to withstand earthquakes or dangerous situations. Here, we establish a model for the estimation of the structural integrity of this type of pump. If the natural frequency that results from a modal analysis is less than 33 Hz, we adopt a dynamic analysis, instead of a static analysis. A dynamic analysis was carried out taking into consideration seismic conditions such as the floor response spectra (FRS), an operation-base earthquake (OBE), and a safe-shutdown earthquake (SSE). Finally, an analytical estimation of the structural integrity of an AFWP is made through a comparison of calculated values and allowable values. If the result is less than the allowable stress, the pump is deemed to have good structural integrity. In addition, future studies will involve a stability check for rotor accidents that may occur during the operation of the pump.
Design Criteria of Spring Stiffness for Pan Check Valve Using CFD Analysis
Park, Ju-Yong ; Baek, Seok-Heum ; Kang, Jung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 49~55
DOI : 10.14775/ksmpe.2014.13.3.049
This paper examines the effects of spring characteristics and stiffness in relation to the characteristics of hydrodynamic force. Spring forces and stiffness determine the performance of this type of pan check valve and have an effect on the overall operation. The hydraulic efficiency of the pan check valve is relatively low compared to that of a common check valve. However, a pan check valve is structurally more stable than a common check valve. We implemented the optimum design to increase the flow rate and to resolve the suppression of the pressure drop according to the extent of the compression of the spring. From the results of a flow analysis, we demonstrate spring stiffness design criteria depending on the extent of the compression of the spring of pan check valve acting on the fluid at the inlet 1 MPa pressure.
FE Analysis of Forging Process for Improving Tool Life in Hot Forging of CV Joint Outer Race
Kim, Yohng-Jo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 56~62
DOI : 10.14775/ksmpe.2014.13.3.056
During the hot forging process, the most common cause of tool failure is wear. Tool wear results in the gradual loss of part tolerances, after which eventually the tool must be replaced or repaired. In order to maximize the lifetimes of forging tools, it is important to investigate the wear mechanisms of these tools. In this study, the hot forging of the outer race of an automotive constant-velocity joint was analyzed by a finite element method to investigate the wear distribution, especially the amount and location of the maximum expected wear damage, using Archard's wear model, which was modified considering the forging temperature. Forging analyses were carried out after modifying blocker forging tools based on established versions. The modified blocker tools resulted in an increase in the tool life up to 31% with a finisher punch.
CAE Analysis on Strength and Fatigue of Rear Door of Passenger Car
Ko, Jong Hyoun ; Kang, Dae Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 63~69
DOI : 10.14775/ksmpe.2014.13.3.063
This paper studies the strength, fatigue sensitivity, safety factor and lifetimes by means of structural and fatigue analyses of different models of rear doors upon the opening of doors and windows leading to severe fatigue fractures of the window motor components of rear doors. The simulation models were a standard model and other models. The other models, which are denoted here as models I and II, were modified versions of the standard model, with a rib of 3mm and a thickness of 2mm as compared to the standard model. The door was modelled with CATIA V5 and analyzed with the ANSYS program. The material of the rear door was cold rolled steel (DDQ). From the study results, the standard model and model I were confirmed to be less safe upon the opening of the door as compared to the opening of a window in terms of fatigue, but model II was found to be safe for both door and window openings.
A Study of on a Power Control System for a Solar-Electric Vehicle
Sim, Han-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 70~76
DOI : 10.14775/ksmpe.2014.13.3.070
The intensity of sunlight becomes lower when weather conditions change, which affects whether a solar-electric vehicle can be driven on a shady road. The power delivered by solar cells can be vary depending on the amount of shade. As a result, the battery system is often used to compensate for variations in the power delivered by solar cells. Therefore, studies of power control systems for solar-electric vehicles are required. In this paper, mathematical models for such a power control system are studied and important variables are considered. Simulation and test results show that the mathematical model and actual designs developed here would be effective when used with solar-electric vehicles.
Surface Roughness Prediction of Interrupted Cutting in SM45C Using Coated Tool
Bae, Myung-Il ; Rhie, Yi-Seon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 77~82
DOI : 10.14775/ksmpe.2014.13.3.077
In this study, we carried out the interrupted cutting of carbon steel for a machine structure (SM45C) with a CVD-coated tool and conducted an ANOVA test and a confidence interval analysis to find factors influence the surface roughness and to obtain a regression equation. We found that factor which mostly affects the surface roughness during interrupted cutting was the feed rate. The cutting speed and depth of the cut only had small effect on the surface roughness. From the result of a multi-regression analysis during an interrupted cutting experiment, we obtained regression equation. Its coefficient of determination was 0.918, indicating that the regression equation was predictable. Compared to continuous cutting, if the feed rate increases, the surface roughness will also increase during interrupted cutting.
Thermal Characteristics Analysis of a High Speed Spindle System by Using FSI Method
Kim, Soo-Tae ; Lee, Seog-Jun ; Choi, Young-Hyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 83~88
DOI : 10.14775/ksmpe.2014.13.3.083
FSI (Fluid Structure Interaction) method, in this study, has been applied to analyzing thermal characteristics of a high speed machine tool spindle system. The spindle is composed of angular contact ceramic ball bearings, a high speed built-in motor, a cooling jacket, and so on. The cooling jacket has three inlets and outlets. Using the FSI method, temperature distributions and thermal displacements of the spindle system were computed considering the heating of the front and rear bearings and the built-in motor. The results computed using the FSI method were compared with those determined by experiment and using the conventional numerical approach. The results determined using the FSI method were similar to those from the conventional numerical approach but showed better agreement with the experimental results. Therefore, it is concluded that the FSI method is useful for analyzing the thermal characteristics of high speed spindles and can be applied to the design of high speed spindles.
Development of the optimal Jig & fixture applied to ultra-precision saddle machining
Kim, Byoung Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 89~95
DOI : 10.14775/ksmpe.2014.13.3.089
The increasing level of demand for multi-tasking machines requires a saddle with an ultra-precise machining accuracy level of
, as such a saddle is one of the main components of these machines. The manner of achieving ultra-precise machining accuracy mainly depends on the fixed forces. In this paper, we optimized the number of contact points and the contact positions to reduce the deformation of the saddle while it is machined. The performance levels of the proposed optimal jig and fixture are determined by measuring the flatness, parallelism and perpendicularity of a machined saddle. The machining accuracy is found to be lower than
at all measured points.
Effects of Ultrasonic Vibration on Machined Surface of Aluminium 6061 in Endmill Cutting Process
Jung, Myung-Won ; Kwak, Tae-Soo ; Kim, Myeong-Kyu ; Kim, Geon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 96~102
DOI : 10.14775/ksmpe.2014.13.3.096
This study focused on the effects of ultrasonic vibration on a machined surface of Al6061 material in the endmill cutting process. It is known that ultrasonic vibration greatly increases the efficiency of the machining process when cutting or grinding. An ultrasonic vibration table was developed for application to ultrasonic vibration endmill machining experiments.Inthisstudy,the surface roughness and actual depth of the cut measured confirm the effects of ultrasonic vibration. As a result of the experiments, the actual depth of the cut increased during endmill machining when using ultrasonic vibration. The surface roughness was improved with increases in the amplitude of the vibration and the depth of the cut.
Strength Durability on Spur and Helical Gears in the Gearbox of Machine Tool
Han, Moonsik ; Cho, Jaeung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 103~110
DOI : 10.14775/ksmpe.2014.13.3.103
In this study, spur and helical box models of an existing machine tool are investigated using structural and fatigue analyses. As the helical box model is shown to have less stress and deformation than those characteristics of the spur box model, the helical box has more strength and more transmission efficiency on the structure. In terms of fatigue analysis, the helical box model has more repeated fatigue strength than that of the spur box model. These study results can be effectively utilized in the design of real gear boxes of machine tools by anticipating and investigating prevention and durability against damage.
Analysis of Polarization Characteristics of the Wire Grid Polarizer According to Pattern shapes and incident angle
Jeong, JiYun ; Cho, YoungTae ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 3, 2014, Pages 111~117
DOI : 10.14775/ksmpe.2014.13.3.111
With the development of technology, the display industry has been focusing on the development of new types of displays, such as bendable and wearable displays. However, the PVA/TAC polarizing film used in the manufacturing of a normal display is associated with low luminance and low efficiency. If the existing polarization film is replaced with a wire grid polarizer, it is possible to reduce the thickness significantly. Moreover enhanced brightness can also be expected. This study confirms the optical properties of the WGP through a simulation.