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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 12, Issue 6 - Dec 2013
Volume 12, Issue 5 - Oct 2013
Volume 12, Issue 4 - Aug 2013
Volume 12, Issue 3 - Jun 2013
Volume 12, Issue 2 - Apr 2013
Volume 12, Issue 1 - Feb 2013
Selecting the target year
Technology for Roll-based Nanoimprint Lithography Systems
Lim, Hyungjun ; Lee, Jaejong ; Choi, Kee-Bong ; Kim, Geehong ; Lee, Sunghwi ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 1~8
Roll-based, nanoimprint lithography (Roll-NIL) is one effective method to produce large-area nanopatterns continuously. Systems and processes for Roll-NIL have been developed and studied for more than 15 years. Since the shapes of the stamp and the substrate for Roll-NIL can be plates, films, and rolls, there exist many concepts to design and implement roll-NIL systems. Combinations and variations of contact-methods for variously shaped stamps and substrates are analyzed in this paper. The contact-area can be changed by using soft materials such as polydimethylsiloxane (PDMS) or silicone rubber. Ultraviolet (UV) sources appropriate for the roll-to-plate or roll-to-roll process are introduced. Finally, two roll-to-plate nanoimprint lithography systems are illustrated.
Analysis of Thermal Effect on Tension of a Moving Web in Roll-to-Roll Printed Electronics
Lee, Jong-Su ; Lee, Chang-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 9~15
Roll-to-roll printing technology has lately become a subject of special interests in the field of printed electronics. Since this technology has the advantage that continuous and mass production is possible. And for high precision register control is required in multi-layer printing to produce the electronic devices, this is one of the most important technologies in roll-to-roll printing technology. Register error could be generated by various reasons like eccentricity of roll and thermal deformation due to temperature variation in drying section. In this study, the effect of tension variation on the register was analyzed. The results of these analyses show that it is essential to consider the tension disturbance which is generated by the change of temperature in drying section, and conventional register model has limitation to estimate the register error. In order to overcome the limitation of the register model, advanced register model based on the SI process was developed. Also, the performance of the developed model was verified experimentally.
Fabrication of Two-dimensional Photonic Crystal by Roll-to-Roll Nanoreplication
Kim, Young-Kyu ; Byeon, Euihyeon ; Jang, Ho-Young ; Kim, Seok-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 16~22
A two-dimensional photonic crystal structure was investigated using a roll-to-roll nanoreplication and physical vapor deposition processes for the inexpensive enhanced fluorescence substrate which is not sensitive to the polarization directions of excitation light source. An 8 inch silicon master having nano dot array with a diameter of 200 nm, a height of 100 nm and a pitch of 400 nm was prepared by KrF laser scanning lithography and reactive ion etching processes. A flexible polymer mold was fabricated by flat type UV replication process and a deposition of 10 nm nickel layer as an anti-adhesion layer. A roll mold was prepared by warping the flexible polymer mold on an aluminum roll base and a roll-to-roll UV replication process was carried out using the roll mold. After the deposition of ~ 100 nm
layer on the replicated nano dot array, a 2 dimensional photonic crystal structure was realized with a resonance wavelength of 635 nm for both p- and s-polarized light sources.
A Statistical Analysis for Slot-die Coating Process in Roll-to-roll Printed Electronics
Park, Janghoon ; Lee, Changwoo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 23~29
Recent advances in printing technology have increased the productivity of the roll-to-roll (R2R) printing process for printed circuitry. In the R2R printed electronics, characteristics of printed and coated layers are one of the most important issues that determine the functional quality of final products. The slot-die technology can coat a large area with high uniformity using low-viscosity materials; determining the process parameters is important to obtain excellent coating qualities. In this study, a viscocapillary model was used to predict qualities of coated layers and patterns. On the basis of analysis results, a novel meta model was derived using design of experiment methodology to improve accuracy. Sensitivity analysis was performed to define major parameters in R2R slot-die coating process. The coating speed was found to most significantly affect the coated layer thickness and was easily controlled. The performance of the proposed model is verified through experimental studies. Based on the statistical analysis results, R2R slot die process can be optimized to guarantee a desired thickness.
Technology for Efficiency Enhancement of Crystalline Si Solar Cell using Nano Imprint Process
Cho, Young Tae ; Jung, Yoon Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 30~35
In order to increase cell efficiency in crystalline silicon solar cell, reduction of light reflection is one of the essential problem. Until now silicon wafer was textured by wet etching process which has random patterns along crystal orientation. In this study, high aspect ratio patterns are manufactured by nano imprint process and reflectance could be minimized under 1%. After that, screen printed solar cell was fabricated on the textured wafer and I-V characteristics was measured by solar simulator. Consequently cell efficiency of solar cell fabricated using the wafer textured by nano imprint process increased 1.15% than reference solar cell textured by wet etching. Internal quantum efficiency was increased in the range of IR wave length but decreased in the UV wavelength. In spite of improved result, optimization between nano imprinted pattern and solar cell process should be followed.
The Effects on a Side-Cut Grinding depend on the Change of the Quill Rigidity
Choi, Hwan ; Kim, Chang-Su ; Park, Won-Kyue ; Lee, Choong-Seok ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 36~41
One of the problems in grinding process using a machining center(MC) with a small diametric wheels is machining error due to decrease of the quill diameter. In this study, side-cut grinding is performed with a vitrified bonded CBN wheel on the machining center. Grinding experiments are performed at various grinding conditions including quill length, quill diameter and depth of cut. The effect on the grinding force, machining error and surface roughness due to the change of the quill rigidity are investigated experimentally. The slenderness ratio of the quill is significant factor to analyse the change of the grinding force and machining error.
Study for Retardation Phenomenon
Kang, Yong-Goo ; Lee, Tae-Won ; Kim, Dong-Myung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 42~49
In this study, in order to analyze the crack retardation behaviors, effective plastic zone concept was proposed. By use of the proposed concept, crack retardation period, compressive residual stress and variation of effective plastic zone shapes were obtained. The results were compared with those of Willenborg model. Retardation period, compressive residual stress and effective plastic zone size obtained by using effective plastic zone concept were larger then the results obtained by using Willenborg analysis. Effective stress intensity factors obtained by using effective plastic zone concept were smaller then the results obtained by using Willenborg analysis.
A Study on the Modal Analysis of Hybrid Vertical Grinding System Bed
Choi, Seung-Geon ; Kim, Seong-Hyun ; Choi, Woong-Kirl ; Shin, Hyun-Jung ; Lee, Eun-Sang ; Kim, Kyu-Dong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 50~56
Machine tools are the cores of industrial development in recent period. It is difficult to develop a system which can do cutting and grinding process in the one system. Hybrid Vertical Grinding System is capable of processing in a single apparatus cutting or grinding. The modal analysis and structural analysis for the development of Hybrid Vertical Grinding System is the first time of domestic work. In this study, Hybrid Vertical Grinding System bed was designed and analyzed by using SS401 and FC300 as materials. And by using Finite Element Methods, the design and material of the bed was analysed. Finally, we can make a better choice of structure and material of the bed by comparing the analysis results.
Structural Analysis on Flange Coupling due to Change of Bolt Numbers
Han, Moonsik ; Cho, Jaeung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 57~66
This study investigates structural and vibration analyses due to the change of bolt Numbers on models 1 and 2 of flange couplings connected with both sides of axis. As maximum equivalent stresses of models 1 and 2 are 122.05 and 102.3 MPa respectively by the basis of bolt, these stresses are within the allowable stress of this model and the safety of bolt design is verified. As maximum equivalent stresses of models 1 and 2 are 196.2 and 196.4 MPa respectively by the basis of body, these stresses are within the allowable stress of this model and the safety of body design is verified. Through natural frequency analysis, maximum displacements of model 1 and 2 are shown at the frequencies of 6565.1 and 6614.9 Hz respectively. Maximum displacements in cases of models 1 and 2 are shown at harmonic frequencies of 7760 and 7840 Hz at real loading conditions. By putting these study results together, the durability of vibration at model 2 with bolt numbers of 8 becomes better than model 1 with bolt numbers of 6. These study results can be effectively utilized with the design on flange coupling by anticipating and investigating prevention and durability against its damage.
Numerical analysis on the inner flow characteristic for small smoke collector
Jang, Sung Cheol ; Woong, Kim Jae ; Yi, Chung Seob ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 67~75
This study is flow analysis on the smoke collector in smoking room. The smoke collector for improving impure air at smoking area is analyzed and the inner flow filed in smoke collector is confirmed on the study result. The velocity with pressure distribution according to suction flow rate at filter entrance is also compared. Pressure characteristic and pressure resistance coefficient are analyzed according to flow analysis result for each other filter. The pressure drop of about 15 Pa occurs at the normal driving mode to strainer inlet from HEPA filter outlet. On the other hand, the pressure drop about 44% increases at turbo mode.
Study on Relation between Surface Roughness and Heat Absorption Capability of Materials for Solar Collector
Chun, Tae-Kyu ; Ahn, Young-Chull ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 76~85
This study was carried out to investigate the relation between surface roughness and heat absorption capability of materials for solar collector. For this purpose, 3 kinds of materials (copper, aluminum, iron), 5 kinds of surface roughness (scrubber, alumina sand #80, #200, #400, glass bead) and 2 kinds of surface treatment (black chrome plating, copper black coating) were used for finding optimal conditions to apply solar collector. As the results, it was confirmed that the optimal relations between surface roughness and surface treatment as well as optimal materials were necessary. Further, heat absorption capability was showed good results in cases of copper materials, glass bead and black chrome plating.
A study on Press Forming Machine of Titanium and Aluminium Plates Formability
Jung, Won-Jae ; Kang, Han-Bin ; Lee, Dong-Wook ; Park, Min-Hyeok ; Song, Ju-Han ; Lee, Seok-Soon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 86~93
Main function of the Press forming Machine is the forming for plates. The head of the Press forming machine consist of several parts. It was named Press forming-contraction and Press forming_expansion according to formability of plates. Aluminium and Titanum plates are forming by using the Press forming machine. In this study, we analyzed sheet metal forming including plastic deformation and the contact pressure in the bearing. Finite element analysis results of Press forming-contraction and Press forming_expansion show the similar results of the actual specimen plates and the bearing contact pressures show the acceptable level of stress in both aluminum and titanium specimens.
Experimental Study on implementation of injection molding process for speaker frame in LED TV
Lee, Sun Kon ; Kim, Sang Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 94~101
Injection molding process is one of the most important methods to produce plastic parts with high efficiency and low cost. The objective of this study is to implement the best plastic injection molding process for LED TV speaker frame. Moldflow analysis and simulation of plastic injection molding process were carried out in order to predict optimal modeling operation conditions and then injection molded part was produced various type of resin temperature, filling time and injection pressure variation. the result was that the best injection molding condition is set as 60bar pressure, 2sec filling time and
degree. The study result would be useful to variety of plastic injection molding process.
Numerical Analysis on the Characteristic of Thermal Distribution for High Temperature Operating Battery Module
Yi, Chung Seob ; Lee, Byung Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 102~108
In this study, the experiment result and numerical analysis on temperature distribution of a secondary battery module for high temperature operation type were compared. Because experimental battery has been in danger of explosions, experiment on temperature distribution was carried out using dummy batteries. Study on NAS battery module, which is secondary battery of high temperature operation type, is as follows ; Test result showed that battery's temperature is in steady state uniformly after 8 hours in each section. It is similar to experimental result for temperature distribution from the result of numerical analysis, and it takes about 8.5 hours to the
Structural analysis and wearability evaluation of a vehicle's swash plate A/C compressor
Kim, Jin-Woo ; Ha, Sun-Ho ; Kim, Sang-Jin ; Kim, Chang-Uk ; Song, Jung-Il ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 109~115
In this study, a variable swash plate compressor has been used in a vehicle to improve its fuel efficiency. To manufacture the swash plate, either SCM 435 or UNS C67300 was used. The effects of using different materials for the structural reliability of compressor have been investigated. Static analysis was carried out on swash plate A/C compressor by using commercial software ANSYS 13.0v. The results showed that the Max. stress occurred on the swash plate made of UNS C67300 was lower than that made of SCM435, which indicated that UNS C67300 is more suitable for producing the safe swash plate.
A Study on Development of High Speed Deburring Machine
Koo, Ja-Ham ; Kim, In-Hwan ; Hur, Nam-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 116~121
A high speed deburring machine was developed based on the analysis of magnetic contact force, forced vibration, stiffness and deformation of the structure. After 3 dimensional CATIA modelling, the stiffness and the deformation properties of the deburring machine in static and dynamic condition using finite element method were analyzed. Both static and dynamic simulation results showed that designed high speed deburring machine was well satisfied the stability properties at the operating condition. we have performance test program for the real system to evaluate the simulation results.
The Study of the Fabrication of the Ultra-Precision Cylinder by the Compensation Process
Lee, Jung-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 122~128
This paper describes the on-machine surface form evaluation of an ultra-precision cylinder for the fabrication by the compensation process. In this study, the surface form error of an ultra-precision cylinder, which was fabricated by the ultra-precision diamond turning machine with a single diamond cutting tool, was evaluated by using two capacitance-type displacement probes. Based on the measurement results, the compensation process was conducted. Since the measurement was carried out on the machine without re-mounting of the workpiece, additional fabrication for compensation process can be conducted precisely.
A Study on Characteristics of Cutting Tool Wear by Cooling Method in Rough Machining of Titanium Alloy
Kim, Gee-Hah ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 129~134
Titanium used in industry has been widely applied for aerospace important parts and automobile important parts, etc. because the titanium is higher in strength compared to the steel and light in weight compared to the steel. This study is to investigate the effect of cutting tool cooling method and cutting time on the spindle speed and feed rate of vertical machining center as a parameter to find the rough cutting time in the medium speed cutting machining of the titanium alloy. It is found that the cutting machining heat are increased as the feed rate, cutting time and spindle speed are raised.
Design Improvement and Performance Evaluation of 20kHz Horn for Ultrasonic Cutting
Seo, Jeong Seok ; Lee, Yoon Jeong ; Kim, Jin Wook ; Park, Dong Sam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 135~140
Ultrasonic cutting is a kind of eco-technique and cost-effective technique to be used for cutting of various materials such as baked product, fresh/frozen food, rubber, textile, wood, bone, etc. The performance of ultrasonic cutting is affected by design of cutting horn and cutting conditions. Specially the design of horn to resonate at the longitudinal direction is most important. To analyze the problems from which cracking and noise are often generated with conventional cutting horn, FEA is carried out, and then improved cutting horn which can reduce maximum stress and stress concentration is designed. Vibration characteristics, resonant frequency, gain, and amplitude uniformity of the cutting horn designed optimally are evaluated through FFT analysis and compared with those of conventional cutting horn.
Development of a 3-D Position Measurement Algorithm using 2-D Image Information
Lee, J.H. ; Jung, S.H. ; Kim, D.H. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 141~148
There are several problems in the conventional 2-D image processing and 3-D measurement systems. In the case of the 2-D image processing system, it is not possible to detect elevation data. In a 3-D measurement system, it requires a skillful operator and a lot of time for measuring data. Also, there exist data errors depending on operators. The limitation of detecting elevation data in the 2-D image processing system can be solved by laser diodes. In this study an algorithm that measures the accurate data in a subject face to be detected by combining laser diodes and a commercial CCD camera is developed. In the development process, a planar equation is developed using laser diodes and the equation is used to obtain a normal vector. Based on the results, an algorithm that transforms commercial CCD camera coordinates to 3-D coordinates is proposed. The completed measurement method will be applied to replace a manual measurement system for vehicle bodies and parts by an automated system.
Study on Performance Comparison for Solar Collectors with Single Evacuated Tube using Surface Treatment and Commercial Double Evacuated Tube
Chun, Tae-Kyu ; Yang, Young-Joon ; Lee, Kyung-Hee ; Ahn, Young-Chull ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 149~156
The performances of solar collectors with single and double evacuated tube were experimentally compared. The solar collector with single evacuated tube using surface treatment in this study consists of radiation fin, heat pipe, absorber plate, glass tube, cap and regulating valve, and so on. Surface treatment was conducted for heat pipe and absorber plate with black chrome plating and copper black coating. As the results, the performance of solar collector with single evacuated tube using surface treatment showed good results compared that of double evacuated tube. Absorber plate played a positive role in performance and showed increase of about 28%. Further performance depends on vacuum degree and vacuum degree has to be considered economical efficiency in solar collector.
Fractal analysis of acceleration signal considering damping
Yoon, Moon-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 157~162
To analyze the dynamic acceleration characteristics, it is necessary to identify the acceleration model using some methods that can represent the dynamic properties well. In this sense, fractal methods were used for the verification of characteristics of an acceleration signal. To estimate and analyze the geometry of acceleration signal, a fractal interpolation and its analysis was introduced in this paper. The chaotic nature of acceleration signal was considered in fractal modeling. In this study the fractal signal modeling has brought a focus within the scope of the fractal interpolation and fractal dimension. And a new idea of fractal dimension has been introduced and discussed considering the damping ratio and amplitude for its dynamic properties of the signal. The fractal dimension of acceleration with respect to the scaling factor using fixed data points of 1000 points was calculated and discussed. The acceleration behaviors of this results show some different characteristics. And this fractal analysis can be applied to other signal analysis of several machining such as pendulum type grinding and milling which has many dynamic properties in the signal.
Development on unmanned automated system at hot Forging work
Jung, Sung-Ho ; Lee, Jun-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 163~169
The objective of this study is to replace labor intensive forging processes by an automated system. For achieving it, an exclusive mechanism that consists of a positioner, an arm, and a hanger is configured to handle hot forging objects. Also, a structural analysis is applied to the horizontal motion unit, which is the most highly loaded, in order to verify its validity. In addition, its possibility is also verified through identifying the performance of the proposed system before applying it to sites. As a result, the major characteristic items, such as positioning accuracy, material diameter, object traveling weight, product failure rate, and forging process rate, in this system are perfectly verified for applying it to manufacturing sites.
An Experimental Study on the Effect of Temperature and Humidity on the Pressure Change of the Bootstrap type Reservoir in the Aircraft
Kim, Jung-Sik ; Yu, Han-Sik ; Park, Dong-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 5, 2013, Pages 170~175
For this study, the domestically developed bootstrap reservoir of the aircraft is set up in accordance with the temperature and humidity conditions depicted on the qualification test, and the variation in the internal pressure of the bootstrap reservoir of the aircraft is examined. The study shows that the bootstrap reservoir has less variation in the internal pressure at room temperature than at low temperature(
). As a result, the internal pressure can be maintained stably when the temperature of working fluid in the bootstrap reservoir and the atmosphere environment is over room temperature(
). Therefore the keeping of temperature above room temperature is very important to operate the bootstrap reservoir of the aircraft properly.