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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of The Korean Society of Manufacturing Technology Engineers
Journal Basic Information
Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 25, Issue 4 - Aug 2016
Volume 25, Issue 3 - Jun 2016
Volume 25, Issue 2 - Apr 2016
Volume 25, Issue 1 - Feb 2016
Selecting the target year
Design of Solenoid Actuator for FCV Cylinder Valve Considering Structural Safety
Lee, Hyo Ryeol ; Ahn, Jung Hwan ; Shin, Jin Oh ; Kim, Hwa Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 157~163
DOI : 10.7735/ksmte.2016.25.3.157
Green vehicles include electric vehicles, natural gas vehicles, fuel cell vehicles (FCV), and vehicles running on fuel such as a biodiesel or an ethanol blend. An FCV is equipped with a cylinder valve installed in an ultra-high pressure vessel to control the hydrogen flow. For this purpose, an optimum design of the solenoid actuator is necessary to ensure reliability when driving an FCV. In this study, an electromagnetic field analysis for ensuring reliable operation of the solenoid actuator was conducted by using Maxwell V15. The electromagnetic field analysis was performed by magnetostatic technique, according to the distance between magnetic poles in order to predict the attraction force. Finally, the attraction force was validated through comparison between the Maxwell results and measurement results. From the results, the error of attraction force ranged from 4.53 % to 9.05 % at testing conditions.
Improvement of Intermittent Advancing Accuracy of Pneumatic Cylinder-Driven Roll Feeder
So, Jung Duck ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 164~170
DOI : 10.7735/ksmte.2016.25.3.164
A proposed pneumatic cylinder-driven roll feeder and an air press were designed to be operated automatically by a PLC. The accuracy of the intermittent feed pitch of the roll feeder was evaluated by measuring lengths of cut-offs of a strip stock by a digimatic vernier caliper. At each predetermined feed pitch, the proposed roll feeder was tested 100 times by varying the feed/cut intervals as 2.0/1.5, 3.0/2.0, and 3.5/2.5 s as test sets. The lengths of the cutoffs of the strip stock ranged from 9.89-10.34, 12.1-12.65, and 15.21-15.67 mm at the predetermined 10, 12, and 15 mm feed pitch, respectively, among the total of 300 samples in each feed pitch, regardless of the feed/shear interval. Therefore, the feed/cut interval at each selected feed pitch was found to have no effect on the accuracy of the intermittent advancing of the strip stock.
CFD Analysis and Explosion Test of a Crankcase Relief Valve Flame Arrester for LNG-fuelled Ships
Lee, Hyo Ryeol ; Ahn, Jung Hwan ; Kim, Dong Keon ; Ahn, Byoung Hoon ; Kim, Hwa Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 171~176
DOI : 10.7735/ksmte.2016.25.3.171
Growing concerns about air pollution have led to increased demand for liquefied natural gas (LNG)-fuelled ships that have crankcases equipped with explosion relief valves to relieve excessive crankcase pressures and stop the flames emitted from the crankcase. The results of a computational fluid dynamics (CFD)-based feasibility analysis of the crankcase relief valve flame arrester design conducted using ANSYS CFX V14 showed that the inlet and outlet relief valve temperatures differed by
. An explosion test was performed based on European standard EN14797 to evaluate the flame transmission and mechanical integrity of the valve. No flame transmission from the pressure vessel to the exterior was detected, and the mechanical integrity of the valve was confirmed. Thus, the relief valve components were found to be safe from the viewpoint of fracture.
High-temperature Deformation Behavior of 5052 Aluminum Alloy for Hot Shearing Process
Song, Shin-Hyung ; Choi, Woo Chun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 177~181
DOI : 10.7735/ksmte.2016.25.3.177
Hot shearing is a method of producing various high-quality planar machine parts by using reduced punch load. In order to predict the results of this process, the deformation behavior of work material at elevated temperatures need to be studied. In this research, a tensile test was carried out for 5052 aluminum alloy at high temperatures of
and strain rates of 0.001-0.1/s. The results of the tensile tests were studied to predict the deformation of the alloy during the hot shearing process. The results showed that hot shearing within a temperature range of
and a strain rate rage of 0.001-01/s will be the most effective in reducing punch load and increasing the sheared edge in the case of 5052 aluminum alloy.
Effect of the Shape of a Guide Grill Above a Resonance Type Sound Absorbing Panel on Intake Flow into a Resonator
Bae, Hyunwoo ; Sung, Jaeyoung ; Lee, Dong Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 182~188
DOI : 10.7735/ksmte.2016.25.3.182
This study investigates cavity flows through a guide grill above a resonator. Vortex distributions and intake flows are simulated for various shapes of the guide grill. The flows are assumed to be compressible, unsteady, and turbulent. Numerical simulations are conducted using a large eddy simulation (LES) model. To analyze the effect of the guide grill shape, three cavity lengths (0.2H, 0.6H, and 1.0H) and cavity angles (
) are considered based on resonator height (H). The results show that the vortex generated in the resonator by cavity flow increases with cavity length. Thus, the intake flow is minimum at the smallest cavity length and angle. However, when cavity length is equal to resonator height, the intake flow decreases. The maximum intake flow occurs at a cavity angle
at higher cavity lengths owing to the interaction between the vortex in the resonator and intake flow.
Safety Evaluation Based on Structural Analysis of Cylinder Valves for Fuel Cell Vehicles
Lee, Hyo Ryeol ; Ahn, Jung Hwan ; Shin, Jin Oh ; Kim, Hwa Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 189~197
DOI : 10.7735/ksmte.2016.25.3.189
Green vehicles include electric vehicles, natural gas vehicles, and fuel cell vehicles (FCVs). In FCVs, pressure vessels have cylinder valves to control hydrogen flow. These valves should be of high quality in terms of safety because hydrogen is stored at ultra-high pressure in pressure vessels. Hence, safety evaluation of these valves is necessary to secure the safety of the FCV. A structural analysis of the cylinder valve was conducted in this study by using a commercial finite element analysis code. The results showed that the safety factor of valve component ranged 1.06-186.44. After categorizing, the stress components at critical points of the cylinder valve parts were evaluated using the corresponding allowable design criteria in the ASME code. The pressurization cycle test was performed as per the regulation to evaluate the safety of the valve.
Durability Analysis of Aluminum Alloy Brake Pedal Manufactured by Die Casting
Cho, Seunghyun ; Kang, Seul-Ki ; Kim, Hangoo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 198~203
DOI : 10.7735/ksmte.2016.25.3.198
Computer-Aided Engineering (CAE) durability analysis and experiments of an aluminum alloy brake pedal were carried out for the car lighter by die casting method. In the CAE analysis, KS standards and criteria of the Volvo Car Corporation were applied, and in the experiment, KS standards were applied. The CAE analysis results show that aluminum alloy brake pedals are stronger than the conventional steel brakes pedals because the yield strength of the aluminum alloy increased by almost 97% over that of steel. Further, the structures of the cylinder and the frame were reinforced with increasing thickness of flame and were changed to suit the die-casting process. Through a durability test based on the KS standard, the strength of a prototype of the aluminum alloy brake pedal was confirmed to be sufficient.
Strength Analysis of Aluminum Alloy Window Wiper Manufactured by Die Casting
Cho, Seunghyun ; Lee, Jeungho ; Kim, Hangoo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 204~210
DOI : 10.7735/ksmte.2016.25.3.204
This study analyzed the amount of displacement of window wipers according to pressure by using finite element analysis (FEA) with KS standards for aluminum alloy window wipers manufactured by die-casting method. The product design was changed over four steps considering the die-casting process to achieve strength greater than that of the conventional steel window wiper. According to the FEA results, the strength of final aluminum alloy window wiper improved by 55% over that of a steel window wiper, and the weight of the former was less by approximately 45%. Therefore, there is the possibility of module downsizing for driving motor capacity. Further, the cost competitiveness improved, and the manufacturing process of aluminum alloy window wipers was simplified.
Investigation of Machined-Surface Condition and Machining Deformation in High-Speed Milling of Thin-Wall Aluminum 7075-T651
Koo, Joon-Young ; Hwang, Moon-Chang ; Lee, Jong-Hwan ; Kim, Jeong-Suk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 211~216
DOI : 10.7735/ksmte.2016.25.3.211
Al alloys are useful materials having high specific strength and are used in machining of parts having thin-walled structures for weight reduction in aircraft, automobiles, and portable devices. In machining of thin-walled structures, it is difficult to maintain dimensional accuracy because machining deformation occurs because of cutting forces and heat in the cutting zone. Thus, cutting conditions and methods need to be investigated and cutting signals need to be analyzed to diagnose and minimize machining deformation and thereby enhance machining quality. In this study, an investigation on cutting conditions to minimize machining deformation and an analysis on characteristics of cutting signals when machining deformation occurs are conducted. Cutting signals for the process are acquired by using an accelerometer and acoustic emission (AE) sensor. Signal characteristics according to the cutting conditions and the relation between machining deformation and cutting signals are analyzed.
Development of Continuous Roll-to-Roll Screen Printing System Using a Flat Screen
Kim, Ga Eul ; Jeon, Yong Ho ; Lee, Moon Gu ; Hong, Min Sung ; Lee, Taik Min ; Kwon, Sin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 217~223
DOI : 10.7735/ksmte.2016.25.3.217
In this research, a continuous roll-to-roll screen printing system was developed using a flat screen. It has a newly devised sliding mechanism of screen printing module, which can be controlled accurately in sync with a moving web, driven by a roll-to-roll tension control and web-guiding system. In addition, the real-time precision alignment module that consists of a vision camera and an
alignment stage was implemented. With this developed system, the feasibility of continuous printing with minimum pattern width below
was verified, and an overlay of
between the laser-patterned reference mark and the printed mark on a 300-mm-wide film was achieved.
Effects of Packing Pressure and Time on Injection Molding of Plastic Micro-channel Plates
Woo, Sang-Won ; Park, Si-Hwan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 224~229
DOI : 10.7735/ksmte.2016.25.3.224
Recently, polymeric micro-fluidic biochips with numerous micro patterns on the surface were fabricated by injection molding for realizing low-cost mass production of devices. To evaluate the effects of process parameters on large-scale micro-structure replication, a
tool insert with surface structures having a patterns of trapezoidal shapes (height:
) was employed. During injection molding, PMMA was used; packing phase parameters and mold temperature were investigated. The replicated surface textures were quantitatively characterized by confocal laser microscopy with 10-nm resolution. The degree of replication at low mold temperatures was found to be higher than that at high mold temperature at the beginning of the packing stage. Thereafter, the degree of replication increased to a greater extent at higher mold temperatures; application of higher mold temperatures improved the degree of replication.
Light Efficiency of LED Street Light Using AC DOB Technology
Kwon, Sun-Pil ; Lee, Soo-Young ; Yoo, Kyung-Sun ; Hyun, Dong-Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 230~236
DOI : 10.7735/ksmte.2016.25.3.230
This research attempted simplifications to the LED street light for price competitiveness. The street light was simplified by replacing the SMPS with an IC driver on the PCB using an AC-type LED. The optical element that shape of a line-shaped lens covered LED crowded. Thus, this study aims to improve LED efficiency by using the minimum optical system. In order to satisfy the M3 regulation of street lighting at grade, the lens was divided into two parts depending on the forward direction of the light. Further, the changes in the number of LEDs located on part 1 and part 2 of the lens were analyzed. Through simulation, we determined the proper light distribution that meets M3 regulation of street lighting.
On-off Control for Continuous Culture of Microalgae in Flat Panel Photobioreactor
Kim, Jae-Hyeok ; Yoon, Chung-Man ; Jeong, Sang-Hwa ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 25, issue 3, 2016, Pages 237~243
DOI : 10.7735/ksmte.2016.25.3.237
Recently, technologies that produce biofuels from microalgae are being studied worldwide. It is necessary to significantly reduce the production costs of biofuels from microalgae for economic reasons. In this study, the growth curve of the microalgae was obtained using the batch-culture method, and the specific growth rate was predicted using the regression method. Based on the culture conditions of the estimated specific growth rate, the turbidity of the microalgae in the flat panel photobioreactor (PBR) was measured. Furthermore, an on-off control scheme was applied to the flat panel PBR in order to culture the microalgae continuously on the basis of turbidity. The parameters of the on-off control system were displayed by LabView. The on-off scheme of peristaltic pump was controlled based on the turbidity in the PBR. In addition, the turbidity values of growth curves were compared and analyzed in the continuous culture process using the on-off controller.