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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
Inspection System of Coating Layers by Thermal Behavior Effect
Yun, Sung-Un ; Kim, Jae-Yeol ; Choi, Seung-Hyun ; Kim, Hang-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 1~7
DOI : 10.14775/ksmpe.2014.13.6.001
Gas turbines for generation are operated under high temperatures, high pressures and in corrosive environments for long periods of time. This environment causes serious damage to these parts. Therefore, the material, coating, and cooling technology used with a gas turbine are important factors with regard to turbine blade development. One method that can be used to protect a product from harsh conditions is the coating technology. A turbine blade undergoes very aggressive thermal stress and experiences high-temperature fatigue. In order to reduce the surface temperature of the components and protect the blade from high-temperature flames, a thermal barrier coating (TBC) is applied to its substrate. This study confirms the applicability of an inspection system for the turbine blade coating layer using an artificial heat source.
Flame image precise measurement and flame control to raise combustion efficiencies of a blast furnace
Kim, Jae-Yeol ; Lee, Seung-Chul ; Kwak, Nam-Su ; Han, Jae-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 8~14
DOI : 10.14775/ksmpe.2014.13.6.008
Pulverized coal (PC) has become an important auxiliary fuel in the iron and steel industry since the technique of pulverized coal injection (PCI) was developed for iron making. The combustion efficiencies of pulverized coal in blowpipes and tuyeres under various operational conditions are numerically predicted to determine the performance levels with regard to different locations of the nozzles in a blast furnace. A variety of parameters, including the pulverized coal quantities, oxygen amounts, inlet temperatures of the tuyeres, and the mass flow rate of coal carrier gas are taken into consideration. Also, in order to develop greater efficiency than those of existing coal injection systems, this study applies a flame measurement system using a charge-coupled device (CCD) camera and a frame grabber. It uses auto sampling algorithms from the flame shape information to determine the device for the optimal location control for PCI. This study finds further improvements of the blast furnace performance via the control of the PCI locations.
Optimal Design Techniques of the Ultra Precision Cutting Unit through using Optimized Bearing positioning and Latest Lubrication Systems
Park, Dae-Kwang ; Cho, Young-Tae ; Kim, Jae-Yeol ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 15~22
DOI : 10.14775/ksmpe.2014.13.6.015
With a conventional positioning apparatus, it is very difficult simultaneously to achieve desired driving ranges and precision levels at the sub-micrometer level. Generally, a lead screw and friction drive have been used as servo control systems. These have large driving ranges, and high-speed positioning is feasible. In this study, we present a global servo system controlled by a laser interferometer acting as a displacement measurement sensor for achieving positioning accuracy at the sub-micrometer level.
Performance Evaluation of Heat Radiant for 50W LED by the CNT Thermal Interface Material
Cho, Young-Tae ; Lee, Choong-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 23~29
DOI : 10.14775/ksmpe.2014.13.6.023
In this study, cooling and heat-transfer tests are performed to compare and evaluate the thermal conductivity in a prepared CNT TIM (thermal interface material). A polymerized CNT heat-transfer resin and commercial thermal grease (Shinetsu G-747) were applied for a comparison test in both cases. Cooling experiments with an aluminum foil specimen were performed in order to measure the temperature distribution using an infrared camera, and in heat radiation experiments, performance testing of the thermal conductivity was conducted using high-power LEDs. Carbon resin with the polymerization of graphite and carbon black, and CNT-polymerized CNT resin with graphite and carbon black were tested and compared with using G-747. It was found that the cooling performance and the heat transfer ability in both the carbon resin and the CNT-polymerized CNT resin were greater than those of G-747 because the temperature by 5.
in both cases appeared lower than that of the G-747.
Development of A New Micro-fabricated AFM Probe for the Measurement of Biomaterials by using the Precision Glass Bead Supply Unit
Kweon, H.K. ; Lin, J. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 30~36
DOI : 10.14775/ksmpe.2014.13.6.030
Many different cells types have been found to be highly sensitive to mechanical force imposed by their surroundings. The cellular response to external mechanical forces has very important effects on numerous biological phenomena. In spite of its importance in biological processes, the cell adhesion force remains difficult to measure quantitatively at the cellular level. In this paper, to enhance quantitative measurements of cell adhesive interactions, a new attaching system and a method in which a glass bead can be attached to an AFM cantilever was designed and fabricated, and the degree of range displacement was controlled in the system. In an experiment, the movement of the stage in the attaching system and the attaching process were measured. The effectiveness of this system was confirmed as well in the experiment. In addition, through a commercial AFM system, the spring constant of the modified AFM probe could be measured.
Structure Analysis and Torque Reduction Design of Industrial Ball Valve
Ha, Sun-Ho ; Kim, Sang-Jin ; Song, Jung-Il ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 37~45
DOI : 10.14775/ksmpe.2014.13.6.037
Ball valves are used as a key element in the process industries. The industrial development of valves has increased steadily, but continued improvement requires high design reliability and long service life. Currently, the development of high performance valves is not easy because of the lack of relevant technology in Korea. Valves are being imported at a level of up to 58 percent of the domestic market, which represents a value of almost 7 million US dollars. Therefore, in this work, the improvement of the design and performance of industrial valves has been studied in an attempt to achieve valves that will have longer service life and better output during operation. The structural stability was evaluated using the ANSYS FSI (Fluid-Structural Interaction) module. Moreover, to obtain maximum product reliability, torque analysis simulation was performed to compare and experimental results. The simulation results were used to predict the change in torque by changes in shape, thereby reducing the time and cost of manufacturing a number of prototypes for experimental validation.
Development of gear type grease lubricator by rapid prototyping
Wang, Duck Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 46~53
DOI : 10.14775/ksmpe.2014.13.6.046
An automatic grease lubricator provides an adequate amount of fresh grease constantly to any type of rotating machine to minimize friction heat and reduce friction loss. This study seeks to develop an automatic grease lubricator by means of rapid prototyping with a gear-driven mechanism and a controlled operation time. The ultimate design is to lubricate an adequate amount of grease by a simple dip-switch clicking mechanism according to an advanced set cycle. The backlash of the gear was minimized to increase the power, and to increase the power of the mechanism, the binding frequency and the thickness of the coil were changed. To control the rotation cycles of the main shaft according to certain set numbers, different resistances and chips were used in the design of the circuit which controls the electrical signals via a pulse. A digital mock-up was analyzed and the rapid prototyping (RP) trial products were tested with a PCB circuit and grease. An evaluation of the outlet capacity of RP trial products was conducted, as the friction caused by the outlet on the wall surface was an important factor in the operation of the equipment. Finally, a finishing process was applied to decrease the roughness of a surface to a comparable level to test the performance of the product.
Decision-Making of Casting Process using Expert System
Kim, Jong-Do ; Yoon, Moon-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 54~60
DOI : 10.14775/ksmpe.2014.13.6.054
In industry, several casting process are widely used to manufacture complex and accurate blank part of hard materials such as aluminum, casting steels, bronze and magnesium alloys which are difficult to manufacture in a blank shape. Even if the casting process does not high accuracy superior surface characteristics other machining process, the casting process is widely used in manufacturing blank part. Furthermore, it is difficult to select appropriate casting process a part among several casting process. for effective selection different process, a careful decision given casting application is necessary. An appropriate casting for a given material and shape condition must be selected for novice engineers in industry. In this paper, an expert system based on an analytic network process(ANP) is suggested for best selection of casting considering a prior interdependency effect among various factors such as material, geometry, process capability, economy and equipment.
Friction Characteristics for Construction thermal insulation manufacturing system Breaker
Son, Jae-Hwan ; Kang, Hae-Dong ; Noh, Kyoo-Ik ; Suk, Jang-Geun ; Choi, Won-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 61~65
DOI : 10.14775/ksmpe.2014.13.6.061
Construction heat insulating material for construction is used in large amounts in industry. In the manufacturing process of this insulation material, a thermal insulation material is completed while a polymer in a liquid state passes through Hall breaker. At this time, the quality and form of a product are determined by a hole in the breaker according to the oil pressure of the fluid and the change of the flow velocity. The friction wear action with regard to partner movement between the two levels of quality of materials affects the performance and the lifetimes of machine parts. In this study of a friction test, SM45C, which is a material used to create brake holes, was used. PVC was used to create the specimen. Moreover, an experiment divided a lubricous state and an unlubricated condition. The resulting value over the load of a pin, the revolving speed of a disk, and the standby state of an experimental result disk could be acquired.
Effective Process Parameters on Surface Roughness in Incremental Sheet Metal Forming
Lee, Sang-Yoon ; Lee, Kyeong-Bu ; Kang, Jae-Gwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 66~72
DOI : 10.14775/ksmpe.2014.13.6.066
Incremental forming is a relatively novel sheet forming process, in which parts can be formed without the use of dedicated dies. In this paper, the influence of the process parameters (tool diameter, step size, feed rate, existence of a die, forming methods, and kinds of tool path) on surface roughness in the case in which parts are processed by incremental forming was discussed. Al 1050 material is used in the experiments. A table of orthogonal arrays is used to design the experiments and the ANOVA method is employed to statistically analyze the results. The obtained results show that the process parameters of tool diameter, step size, and the existence of a die have a significant effect on the surface roughness, whereas the feed rate, forming methods and kinds of tool path are insignificant.
Robust Design of Gate Locations and Process Parameters for Minimizing Injection Pressure of an Automotive Dashboard
Kim, Kwang-Ho ; Park, Jong-Cheon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 73~81
DOI : 10.14775/ksmpe.2014.13.6.073
In this paper, multiple gate locations and process conditions under concern are automatically optimized by considering robustness to minimize the injection pressure required to mold an automotive dashboard. Computer simulation-based experiments using orthogonal arrays(OA) and a design-range reduction algorithm are consolidated into an iterative search scheme, which is then used as a tool for the optimization process. The robustness of a design is evaluated using an OA-based simulation of process fluctuations due to noise as well as the signal-to-noise ratio. The optimal design solution for the automotive dashboard shows that the robustness of the injection pressure is significantly improved when compared to the initial design. As a result, both the die clamping force and the pressure distribution in the part cavity are also much improved in terms of their robustness.
Manufacturing of MR Dampers and Estimation of the Bingham Model Parameters
Lee, Gun-Myung ; Park, Mun-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 82~87
DOI : 10.14775/ksmpe.2014.13.6.082
Small MR dampers with a simple structure were designed and manufactured. The Bingham model was used to represent the dynamic characteristics of the damper, and the parameters of the model were estimated from experimental data which were obtained by harmonic tests. The value of the estimated yield shear force remains positive when no electric current is applied, and it increases slowly with the current. The estimated viscous damping coefficient has a value close to zero when no electric current is applied, and it increases almost linearly with the current.
Analysis of Friction-Induced Vibrations in a Ball Screw Driven Slide on Skewed Guideway
Choi, Young Hyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 88~98
DOI : 10.14775/ksmpe.2014.13.6.088
A moving mass on a skewed linear guideway model to analyze the friction-induced stick-slip behavior of ball-screw-driven slides is proposed. To describe the friction force, a friction coefficient function is modelled as a third-order polynomial of the relative velocity between the slide mass and a guideway. A nonlinear differential equation of motion is derived and an approximate solution is obtained using a perturbation method for the amplitudes and base frequencies of both pure-slip and stick-slip oscillations. The results are presented with time responses, phase plots, and amplitude plots, which are compared adequately with those obtained by Runge Kutta 4th-order numerical integration, as long as the difference between the static and kinematic friction coefficients is small. However, errors in the results by the approximate solution increase and are not negligible if the difference between the friction coefficients exceeds approximately 40% of the static friction coefficient.
A Study on Design of Reducer Using Hypoid High Ratio Gear
Kim, Seongyong ; Lee, Changwoo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 99~103
DOI : 10.14775/ksmpe.2014.13.6.099
A hypoid gear is a type of spiral bevel gear whose axis does not intersect with the axis of the meshing gear. The size of a hypoid gear is compact and the ratio of contact is high; therefore, the noise is lower than in other types. Due to these characteristics, the hypoid gear is commonly used in manufacturing processes such as those of escalators and subway screen doors. The purpose of this paper is to develop a reducer using the hypoid gear. In order to check the stability of the proposed reducer, 3D modeling is carried out by CATIA, and a structural analysis is performed using FEM (a finite element method).
Experimental Study on Non-contact Type Inspection System for Wing Rib Thickness Measurement
Lee, In-Su ; Kim, Hae-Ji ; Ahn, Myung-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 104~110
DOI : 10.14775/ksmpe.2014.13.6.104
This paper presents a non-contact inspection system for automatically measuring the thickness of an aircraft wing rip product. In order to conduct the inspection of the wing rib thickness automatically, a non-contact laser displacement sensor, end-effector, and a robot were selected for use. The non-contact type inspection system was evaluated by measuring the measurement deviation of the rotation direction of a C-type yoke end-effector and the transfer direction of a V-slim end-effector. In addition, the non-contact inspection system for wing rib thickness measurements was validated through thickness measurements of a web, flange, and stiffener.
A Study on High Speed Machining Distortion Characteristics of Aluminum Lithium Alloys Wing Rib
Lee, In-Su ; Kim, Hae-Ji ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 111~118
DOI : 10.14775/ksmpe.2014.13.6.111
Aluminum lithium alloys are new materials developed for lightweight aircraft parts. However, as compared with conventional aluminum alloys in high-speed machining, problems such as tool wear, machining distortion, and cutting ability arise. This study presents the machining distortion characteristics of an Al-Li alloy wing tip in relation to the cutting heat in high-speed machining. A machining experiment was conducted with high-speed machining equipment for an evaluation of the machining distortion characteristics, with each machining stage temperature change of the workpiece machining surface, and the inside and outside temperature changes of the equipment measured. By measuring the amount of distortion of the workpiece before and after machining, the cutting heat was analyzed with regard to its effect on machining distortion in the product.
Machining characteristics on ultrasonic vibration assisted micro-electrical discharge machining of carbon-nanotube reinforced conductive Al
Kang, Myung-Chang ; Tak, Hyun-Seok ; Lee, Chang-Hoon ; Kim, Nam-Kyung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 119~126
DOI : 10.14775/ksmpe.2014.13.6.119
Micro-holes of conductive ceramic are required in micro structures. Micro-electrical discharge machining (Micro-EDM) is an effective machining method since EDM is as process for shaping hard metals and complex-shaped holes by spark erosion in all kinds of electro-conductive materials. However, as the depth of micro hole increases, the machining condition becomes more unstable due to inefficient removal of debris between the electrode and the workpiece. In this paper, micro-EDM was performed to evaluate machining characteristic such as electrode wear, machining time, taper angle, radial clearance with varying voltage and ultrasonic vibration on 10 vol.% Carbon-nanotube reinforced conductive
composite fabricated by spark plasma sintering in previous research.
Vibration Reduction for a Local Operation Panel Mounted by Wire Rope Isolator
Kim, Chae-Sil ; Kim, Dong-Il ; Heo, Jong-Dae ; Hwang, Jae-Deok ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 127~133
DOI : 10.14775/ksmpe.2014.13.6.127
This paper reviews a finite element model of a wire rope isolator (WRI) via an experimental comparison test. A local operation panel (LOP) mounted on a WRI is modeled using a finite element method. Mode analyses and harmonic analyses are conducted while varying of the thickness of the rope for the WRI. A feasible WRI can be selected considering the reduction of the vibration and the total weight of the LOP system.
A Study on the Dynamic Stability of a Power Pack for Heavy Construction Equipments
Kim, Dong-Il ; Kim, Chae-Sil ; Lee, Sang-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 134~138
DOI : 10.14775/ksmpe.2014.13.6.134
Power packs can change energy to hydraulic energy generated by an engine as a tool for use with civil engineering construction equipment. This paper determines which type of power pack meets the standards of construction machinery. A power pack was formulated as a three-dimensional model by using the software CATIA. A modal analysis was conducted using ANSYS Workbench, and the resonance was checked. Next, a harmonic analysis was conducted. The analytical results show that the dynamic stability of the power pack is assured.
System calibration method for Silicon wafer warpage measurement
Kim, ByoungChang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 139~144
DOI : 10.14775/ksmpe.2014.13.6.139
As a result of a mismatch of the residual stress between both sides of the silicon wafer, which warps and distorts during the patterning process. The accuracy of the warpage measurement is related to the calibration. A CCD camera was used for the calibration. Performing optimization of the error function constructed with phase values measured at each pixel on the CCD camera, the coordinates of each light source can be precisely determined. Measurement results after calibration was performed to determine the warpage of the silicon wafer demonstrate that the maximum discrepancy is
with a standard deviation of
in comparison with the test results obtained by using a Form TalySurf instrument.
A study on the strengthening of Sodalime glass using ion exchange method
Ahn, H.W. ; Oh, J.H. ; Kweon, S.G. ; Choi, S.D. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 6, 2014, Pages 145~151
DOI : 10.14775/ksmpe.2014.13.6.145
The glass used for mobile display windows is required to have high strength. Chemical strengthening by means of ion exchange is widely used glass. The depth of the layer and the compressed stress are affected by tempering temperature and time. The purpose of this study is to investigate the range of DOL and CS, which to less breakage during reliability tests such as the ball drop test, hole drop test, 3-point bending test, drop test, and tumble test with Soda-lime Glass.