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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
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Journal DOI :
The Korean Society of Manufacturing Process Engineers
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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
Machinining of Specular Hologram using End-mill Technology
Jeon, Eun-Chae ; Cha, Jin-Ho ; Lee, Je-Ryung ; Choi, Hwan-Jin ; Kim, Chang-Eui ; Je, Tae-Jin ; Kim, Hwi ; Choi, Doo-Sun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 1~6
DOI : 10.14775/ksmpe.2014.13.4.001
The specular hologram is one type of hologram, and it consists of many arcs. They are very easy to fabricate and can even be machined by hand and a compass. In this study, we designed two squares having different depths and consisting of many arcs, after which we machined the arcs using end-mill technology. The width of the machined arcs showed high repeatability. Moving tracks were observed on the bottom surface, and top burrs were noted. In spite of them, the phenomenon of the specular hologram was observed when an observer and a light source stood on the same side. The two squares seemed to have different depths when they were observed from the left and right directions. In this study, it was verified that a specular hologram can be manufactured by end-mill technology.
Fabrication and analysis of optical micro-pyramid array-patterns
Lee, Je-Ryung ; Jeon, Eun-Chae ; Je, Tae-Jin ; Woo, SangWon ; Choi, Do-Sun ; Yoo, Yeong-Eun ; Kim, Hwi ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 7~12
DOI : 10.14775/ksmpe.2014.13.4.007
A transparent poly methyl methacrylate (PMMA) optical micro-pyramid array-pattern is designed and fabricated using an injection modeling technique. The device's optical characteristics are tested and analyzed theoretically. In the optical pattern generated using the fabricated PMMA pattern, the components, due to not only refraction but also diffraction, are observed simultaneously. Wave optic modeling and analysis reveals that the energy ratio between the diffraction and refraction in the optical pattern are dependent on the critical dimension of the optical pattern such that the refraction and diffraction tend to be directly and inversely proportional to the pattern dimension, respectively.
Fabrication of uniform micropattern arrays using nonionic surfactant-based wet etching process of high purity aluminum
Jang, Woong-Ki ; Jeon, Eun Chae ; Choi, Doo Sun ; Kim, Byeong Hee ; Seo, Young Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 13~20
DOI : 10.14775/ksmpe.2014.13.4.013
In this paper, the effects of a nonionic surfactant on the etch uniformity and the etch profile during the wet-etching process of high-purity aluminum were investigated for the fabrication of uniform micropattern arrays. To improve the surface roughness of a high-purity aluminum plate, a mechanical lapping process and an electrolytic polishing process were used. After electrolytic polishing process, the surface roughness, Ra, of the high-purity aluminum plate was improved from
. A photoresist was used as an etching mask during the aluminum etching process, where the mixture of phosphoric acid, acetic acid, nitric acid, a nonionic surfactant and water was used as the aluminum etchant. Different amounts of the Triton X-100 nonionic surfactant were added to the aluminum etchant to investigate the effect of a nonionic surfactant during the wet-etching process of high-purity aluminum. The etch rate and the etch profile were measured by an optical interferometer and a scanning electron microscope.
Numerical Analysis of Micro-pattern Filling with Gas Dissolution by Injection Molding Process
Park, Sung Ho ; Yoo, Hyeong Min ; Lee, Woo Il ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 21~27
DOI : 10.14775/ksmpe.2014.13.4.021
The injection molding process has several advantages enabling it to produce large quantities of molded plastic products using a repetitive process. In recent years, it has been necessary to develop an injection molding process with micro/nano-sized patterns for application to the semiconductor industry and to the bio/nano manufacturing industry. In this study, we apply gas pressure to the inside of a mold and consider the gas dissolution phenomenon for a resin filling into a micro pattern with a line structure. Using numerical analysis, we calculate the filling ratio with respect to time for various internal gas pressures and various aspect ratios of the micro-patterns.
Experimental Study on Shape Machining Characteristics of Composite Honeycomb Core
Han, Seung-Woo ; Kim, Hae-Ji ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 28~35
DOI : 10.14775/ksmpe.2014.13.4.028
A composite honeycomb core is widely used for lightweight aircraft materials. However, the composite honeycomb core coupled with metal-cutting machining processes does not make a very good match. This paper describes an experimental study of the shape-machining characteristics of a composite honeycomb core, in which a five-axis gantry machine is used. The experimental conditions of the offset allowance, tooling condition and feed rate were applied. The shape machining characteristics of a flat surface, a vertical surface, and a concave surface are evaluated by comparing the machining shape and burr characteristics.
A Study on Effect of Flow Characteristics for Turbine Impeller Shape
Jeon, Eon-Chan ; Youn, Gi-Ho ; Kang, Chang-Hun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 36~43
DOI : 10.14775/ksmpe.2014.13.4.036
Recently, research has been conducted to develop the ORC (organic Rankine cycle), to recover waste heat from facilities such as industrial plants ultimately to create mechanical or electrical energy. The ORC system consists of a heat exchange, a condenser, a pump and a boiler. In this paper, 84 flow analyses were conducted with 21 cases and three variables, i.e., a number of large wings, a number of small wings, and RPMs. R245fa was used as a refrigerant. The flow cavitation phenomenon was investigated through a flow analysis, and a flow stream analysis was conducted.
Design of Roll Forming Machine for Fail Safe Chord Forming Process
Jung, Won-Jae ; Park, Min-Hyeok ; Choi, Jin-Kyu ; Nam, Kwang-Sik ; Shang, Zhao ; Lee, Jae-Hyung ; Lee, Seok-Soon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 44~49
DOI : 10.14775/ksmpe.2014.13.4.044
Roll forming technology has a problem in that it depends only on experience without accurate data in the actual field. To solve this problem, it is necessary to procure accurate data during the roll forming process. To this end, we determined the operating force and the material thickness by implementing several changes to those variables during an experiment. This study compares the FEA results and experimental results. Experimental results were used for the basic data of the design. The FEA results show that the roll forming machine is operating accurately and safely. And, a comparison of the results shows that the design of the automatic roll forming machine is operating in the right way. This design of an automatic roll forming machine will be helpful for many areas of the industry.
Study on Thermal Analysis for Heating System of Mobile Smart Device Cover Glass Molding Machine
Shin, Hwan June ; Lee, Jun Kyoung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 50~55
DOI : 10.14775/ksmpe.2014.13.4.050
Currently, flat cover glasses are widely applied to mobile devices. However, for a good design and for convenience of use, curved cover glasses are in demand. Thus, many companies are attempting to produce curved cover glasses using a shaving technique, but the production efficiency is very low. Therefore, a molding technique has been adopted to increase the efficiency of curved glass production systems. For a glass molding system, a uniform temperature distribution of the mold is crucial to produce high-quality curved cover glasses. Before setting the heating conditions of the molding system for a uniform temperature distribution by a thermal analysis, verification is required. Therefore, in this study, temperature measurements were conducted for a prototype molding system and the experimental results were compared with simulation computations. The temperatures of the heating block surface were in good agreement with the computational results for transient and steady conditions.
Application of Response Surface Methodology for Modeling and Optimization of Surface Roughness and Electric Current Consumption in Turning Operation
Punuhsingon, Charles S.C. ; Oh, Soo-Cheol ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 56~68
DOI : 10.14775/ksmpe.2014.13.4.056
This paper presents an experiment on the modeling, analysis, prediction and optimization of machining parameters used during the turning process of the low-carbon steel known as ST40. The parameters used to develop the model are the cutting speed, the feed rate, and the depth of the cut. The experiments were carried out under various conditions, with three level of parameters and two different treatments for each level (with and without a lubricant), to determine the effects of the parameters on the surface roughness and electric current consumption. These effects were investigated using response surface methodology (RSM). A second-order model is used to predict the values of the surface roughness and the electric current consumption from the results of experiments which collected preliminary data. The results of the experiment and the predictions of the surface roughness and electric current consumption under both treatments were found to be nearly identical. This result shows that the feed rate is the main factor that influences the surface roughness and electric current consumption.
Thermal Shock Durability Test of a Gasoline Turbocharger Waste Gate Valve Assembly Manufactured by a Metal Injection Molding
Nam, Chungwoo ; Han, Manbae ; Chun, Bongsu ; Shin, Jaesik ; Kim, Jongha ; Min, Doosik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 69~74
DOI : 10.14775/ksmpe.2014.13.4.069
A waste gate valve (WGV) assembly for a gasoline turbocharger is typically manufactured by means of precision casting. In this study, however, it was newly manufactured in a more innovative way, metal injection molding (MIM) using Inconel 713C alloy, and its performance was tested in a 1.6L direct injection gasoline engine by a thermal shock durability test that lasted 300 hours, after which the results were compared to those of a precision-cast WGV assembly with regard to the engine intake boost pressure, turbine wheel speed, and transient intake pressure. It was found that the two WGV assemblies showed similar performance levels throughout the durability test.
Development of the Pin Type Load-cell Using Strain Gauge
Lee, Dong-Wook ; Park, Min-Hyuk ; Lee, Gye-Gaong ; Kim, In-Hwan ; Lee, Seok-Soon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 75~82
DOI : 10.14775/ksmpe.2014.13.4.075
A pin-type load-cell which uses shear-type strain gauges was developed to measure the tension of a wire in a winch. A finite element analysis was performed to determine the locations of the strain gauges. All of the shear-type strain gauges were attached onto parts that undergo regularly shear stress distributions. A Wheatstone bridge circuit was used to connect each of the gauges and to measure the strains. Linearity within the 5% error range was noted when testing the pin-type load-cell.
Effects of cutting condition on surface roughness in the spiral up milling of aluminum alloy
Chun, Se-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 83~90
DOI : 10.14775/ksmpe.2014.13.4.083
The spiral up milling of an aluminum alloy was performed in this study. In accordance with the cutting condition, the surface roughness behavior and significance of the research with regard to specific factors were analyzed. The cutting speed, feed, and depth of the cut were found to be statistically significant. A higher cutting speed improved the surface roughness. On the other hand, as the feed and depth of the cut increase, the surface roughness decreases. An interaction effect between the feed and depth of the cut was detected. According to the surface roughness in relation to the cutting conditions, the model showed non-linear behavior.
A Study on the Electronically Controlled Cooling system for Bimodal Tram
Kim, Chang-Uk ; Kim, Hea-Soo ; Song, Jung-Il ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 91~98
DOI : 10.14775/ksmpe.2014.13.4.091
In this study, the first and second electronically controlled cooling systems for a bimodal tram were developed. The performance characteristics of the cooling systems were assessed experimentally with actual and identical conditions, and a simulation was run using ANSYS Fluent. The results of the experimental and FEA method were standardized. In order to confirm the reliability of the experimental method, the experiment was carried out by a testing institution. The low-volume flow-rate condition was found to be better, but the cooling system performed in a minimal condition. Therefore, it is important to find the optimum performance levels. The cooling system equipment was revised to determine the optimized design parameters, after which the cooling performance levels increased at the radiation area. Specifically, with a greater fan diameter. Through this study, the newly developed cooling system will be reevaluated after being mounted on an actual bimodal tram. This will lead to a completely domestically produced bi-modal tram cooling system.
Effect of Surface Roughness on Cutting Conditions in CNC lathe C-Axis Milling Arc Cutting
Shin, Kuk-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 99~105
DOI : 10.14775/ksmpe.2014.13.4.099
The domestic airline industry undertakes the production of finished products by assembling existing self-described components via a design process which involves assembly and production steps, after which many of the finished products are exported. However, high reliability and stability must be guaranteed, because customers require high-precision components at the time of manufacturing. In the aircraft parts industry, the mass production of high-value-added parts is limited. Therefore, a small production scale depending on the part is used, as many types of conventional CNC lathe machines with X-axis and Z-axis as well as Z-axis and C-axis CNC milling are used. The parts also rely on high-pressure air to increase production. The most important factors are good stability during processing, as high-precision parts are required, as noted above. It was found that as the C-axis rotation speed increased, the diameter of the cutting tool decreased with a decrease in the surface roughness, while the workpiece rotation speed increased with an increase in the surface roughness.
A Study on the Behavior Characteristics of Tsunami Damper for the Nuclear Power Plant
Seo, Ji-Hwan ; Kim, Byung-Tak ; Chin, Do-Hun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 106~112
DOI : 10.14775/ksmpe.2014.13.4.106
This study presents the mechanical behavior of a ventilating window (a tsunami damper) on the building wall of a nuclear power plant. The window, which is under development, is used to ventilate a machinery room and the building under normal conditions, but it also provides a safety barrier for critical equipment against a tsunami caused by an earthquake. A finite element analysis was conducted to investigate the deflection and the stress distribution of the window under given loading conditions. With symmetry, a one-quarter portion of one window was modeled, and the pressure due to a great tide is assumed to be 7 bar. A structural analysis of the assembled frame, composed of a blade and casing, was also conducted using contact conditions to find the stress and strain configurations caused by the applied pressure.
Experimental Study on Air Flow Characteristics of Axial Dual-blade Fan
Kim, Hae-Ji ; Lee, Yong-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 113~120
DOI : 10.14775/ksmpe.2014.13.4.113
To ventilate indoor spaces, axial single-blade fans are widely used in various areas, such as schools, houses, offices, and restaurants. Recently, axial single-blade fans were developed to realize energy efficiency and noise reduction improvements. Here, an experimental study of the air flow characteristics of an axial dual-blade fan is conducted. The characteristics of the axial dual-blade fan were tested via an air flow analysis and with prototypes. For the performance of the fan, the flow rate, power consumption, and noise were evaluated. The result showed that the axial dual-blade fan uses less power and produces less noise in comparison with an axial single-blade fan.
Development of a High Efficient LED System for the Plant Growth
Hwang, Jong-Dae ; Ko, Dong-Su ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 4, 2014, Pages 121~129
DOI : 10.14775/ksmpe.2014.13.4.121
This study was carried out to develop an efficient plant growth system that can be controlled by altering the wavelength and illumination using a LED module. If it is possible to develop a system that can be controlled in this manner, utilizing different characteristics in the meaningful wavelength band depending on the growth time or type of plant, the plant growth conditions can be optimized. In order to this, red, green, blue and white LEDs are arrayed in a rectangle, consisting of LED modules which can be combined with each other. Consequently, the array can be used to select the optimal light conditions with monochromatic red, green, blue and white LEDs, or mixed LEDs, for plant growth. Experiments on the characteristics of the wavelengths to evaluate the efficiency of the plant growth system were performed. The usefulness of the system was demonstrated through a cultivation test involving several special plants.