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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
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 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
Structural strength analysis according to the configuration of speaker placer with wall hanger type
Cho, Jae Ung ; Han, Moon Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 1~8
This study investigates life and damage due to structural and fatigue load at speaker placer with wall hanger type. As the small stress and deformation are shown at the models of A, B and C shapes on structural analysis, there is no problem at installing speaker placer. As the largest stress is happened at the middle part of joint on the models of A, B and C shapes, this part must be considered at the design. A shape is thought to have most fatigue damage among 3 shape models. C shape model has most excellent, but A model has least at fatigue durability. This study result is applied with the design of speaker placer and it can be useful at predicting prevention and durability against its damage.
A study on the Cutting Force Variation Comparison between Low CBN and Coated Low CBN Tools in Turning of SCM440
Bang, Hong-In ; Kim, Tea-Young ; Oh, Sung-Hoon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 9~14
In recent years, high hardness steel is used for most of the material in many areas including aircraft, nuclear power, space exploration and automotive parts. Low CBN tools are widely used in industrial field which can effectively process high hardness steel of HRC 45 or harder. The results of this study demonstrated, when high hardness steel, SCM440 is turned with Low CBN tools coated with TiN and TiAlN coatings respectively, that both the thrust force and cutting force tends to increase with more increase in cutting force than thrust force, as the feed rate increases at constant cutting speed. In addition, the size of the cutting force and thrust force does not change with the increased cutting speed at the same feed rate, but the tool life is reduced if the cutting speed is increased to shorten the machining time. Therefore, it is recommended to limit the cutting speed at 250 m/min maximum or less. Furthermore, comparing the cutting force of the three tools at the same cutting condition, Tin coating tool showed the smallest cutting force and Low CBN was the next, and the TiAlN coating tools showed the largest cutting force.
Ocean Engineering Basic Test for 5MW Offshore Wind Turbine Sub-structure Jack-up Platform
Jeon, Jung-Do ; Jeon, Eon-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 15~21
The safety and stability of 5MW class offshore wind turbine Jack-up platform was investigated through ocean basin experiment. For simulating the environmental condition of yellow sea in the South Korea, diverse waves, winds and currents were performed based on Froude's number. Regular wave and irregular wave based on Froude's number were applied to the wind turbine structure. In experiments, the height and period of regular wave type were scaled down as the 1:50 ratio of real wave condition. Irregular wave type was simulated with TMA(Texel Storm, Marsen and Arsloe)spectrum. The vertical reaction force, resonance period and wave pressure applied to multi-supporters of wind offshore structure were measured experimentally. Finally, the results showed that the capsizing situation of the offshore structure was generated by the severe environmental condition.
Finite Element Analysis for Shot Blasting Process Optimization of Stainless Steel
Song, Seung Youp ; Park, Junyoung ; Kim, Jun-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 22~27
A shot blasting process is to improve the surface quality of stainless steels. The process is similar to a well-known shot peening that is used to strengthen the surface via the residual stress. In the shot blasting process, it is important to decide many parameters, such as the size, incident angle and velocity of shot balls, to effectively get rid of the iron oxide on the surface of stainless steels. In this study, the simulation of the shot blasting process is carried out by a finite element software, which can help to find out the optimal design parameters to cause the delamination of the iron oxide from the stainless steel substrate. The results obtained are also compared to those of the discrete element method to verify them.
Study on Development of Automotive Door Trim Rail including Texturing Skin
Lee, Eun-Jong ; Kim, Key-Sun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 28~34
For the senses of beauty and texture, internal components of small passenger cars are manufactured by texturing plastic with drawplate but those of deluxe passenger cars are manufactured by bonding pre-embossed skin to the surface of drawplate. As the pre-embossed skin is bonded at high temperature and pressure, the pattern of skin is distorted. The corner part is hardened and its dimension tolerance is changed by resulting in the increase with its defective rate. This study provides the method to design and manufacture the door trim track by vacuuming the non-patterned skin to upper-side drawplate which forms the pattern of descending skin. It is pressed to the plastic product with hot-press method and the damage of bossed-pattern is prevented. Valuation in this study has been done by analyzing, designing and experimenting method.
A Study on Visual Feedback Control of Industrial Articulated Robot
Shim, Byoung-Kyun ; Han, Sung-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 35~42
This paper proposes a new approach to the designed of visual feedback control system based on visual servoing method. The main focus of this paper is presented how it is effective to use many features for improving the accuracy of the visual feedback control of industrial articulated robot for assembling and inspection of parts. Some rank conditions, which relate the image Jacobian, and the control performance are derived. It is also proven that the accuracy is improved by increasing the number of features. The effectiveness of redundant features is verified by the real time experiments on a SCARA type robot(FARA) made in samsung electronics company.
A Comparative Study on Engine Performance and Exhaust Emission Characteristics of Response Power 150HP & 240HP Turbocharged Marine Diesel Engine
Kim, Tae-Hyun ; Lee, Chi-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 43~51
This is a thesis about the experiment of comparison characteristic of power and exhaust gas in the same condition between diesel engine that is equipped turbocharger different from response power to increase effectiveness of the engine which is recently used in a lot of industry which requires high power. Resulting of the experiment with natural aspiration diesel engine and turbocharger diesel engine, difference in low speed is not significant, but in high speed, effectiveness of turbocharger diesel engine is much higher than the other one. In other hand, in exhaust gas experiment, turbocharger model exhausts more
, but it doesn't significantly affect the result when it comes with decreasing of
and effectiveness of increased power characteristic. As a result, the turbocharger diesel engine is economically effective comparing with the natural aspiration diesel engine.
Analysis on Cutting Force of Tool in Gear Chamfering Process
Choi, Boo-Rim ; Hwang, Kwang-Bok ; Bae, Kang-Yul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 52~62
In order to obtain the relation between the cutting force and the process parameters in the chamfering process for the gear of a gear shaft, analysis of the process was performed with a simplified model instead of considering the whole actual 3-dimensional cutting situation produced between cutting tool and gear. The model divided the actual situation into the accumulation of hundreds of 2-dimensional layers with a small thickness in the direction of the height of gear and derived cutting force at a cutting position by accumulating each cutting force calculated in a layer. With proposed method to analyze the cutting forces in the chamfering process, it was revealed that the cutting position and size were exactly searched to calculate the cutting force in each layer. The total cutting force was the highest in the corner where the cutter encountered the gear first during the relative motion between them. The cutting forces were changed in proportion to the cutting parameters such as feed rate and trajectory.
Experimental Study on the Optimized Lubrication Conditions in MQL Turning of Workpieces with Taper Angle
Kim, Dong-Hyeon ; Kang, Dong-Wi ; Cha, Na-Hyeon ; Lee, Choon-Man ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 63~69
Many researchers are trying to reduce the use of lubrication fluids in metal cutting to obtain safety, environmental and economical benefits. The aim of this study is to determine the optimization lubrication conditions in minimum quantity lubrication(MQL) turning of workpieces with taper angle. This study has been considered about various conditions of MQL. The objective functions are cutting force and surface roughness. Design factors are nozzle diameter, nozzle angle, MQL supply pressure, distance between tool and nozzle and length of supply line. The cutting force and surface roughness were statistically analyzed by the use of the Box-Behnken method. As a results, optimum lubrication conditions were suggested and verification experiment has been performed. The results of this study are expected to help the selection of lubrication conditions in MQL turning.
A Study on Designing Autonomous Parking Assistance using Fuzzy Controller
Choo, Yeon-Gyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 70~76
Recently, the performance and function of electrical and electronic system in automotive vehicles is developing at a rapid rate with the advancement of IT technologies. Combined together with micro-controller and sensor technologies, the Vehicle Smart System (VSS) being developed to improve driver's convenience and comfort has been employed to a variety of applications. In addition to the convenience system, the Auto-parking Assistance System (AAS) that is now attracting a new attention has been already applied to some vehicles, but it is currently limited to luxury car models only. In this paper, we present a fuzzy controller that enables autonomous parking assistance without the AAS. The controller can perform the assistance with information provided from moving status, current position and steering angle as one is able to park a car based on his/her experience and knowledge for driving and parking. We have evaluated its performance of the proposed controller by simulation and tested the excellence of the controller by building a model vehicle embedded with the micro-controllers.
A Determination of Design Parameters for Application of Composite Coil Spring in a Passenger Vehicle
Oh, Sung-Ha ; Choi, Bok-Lok ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 77~83
This paper presents the feasibility on the application of composite coil spring, which has great interest in the automobile industry. In order to obtain much lighter weight of the composite spring, it will be necessary to optimize the design variables such as fiber angles and diameter of coil, etc. First of all, mechanical properties were measured to consider the effects of FVR and ply angles for carbon fiber composite material. And the shear modulus with respect to ply angles were derived based on twisting angles calculated by torsional beam model. Next we determined the design parameters of composite coil spring, which has equivalent spring rate to the steel coil spring. In order to assess the proposed method, finite element model of the composite spring was developed and analysed to obtain the spring constant. The results showed that static spring rate of the composite spring was in a good agreement with that of steel spring.
A Study on Characteristics of Cutting by Cutting Conditions in Titanium Machining
Kim, Gee-Hah ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 84~89
Titanium used in industry has been widely applied for aerospace engine, structures and spacecraft exterior, 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 depth and cutting time on the spindle speed and feed rate of vertical machining center as a parameter to find the rough cutting time and cutting depth in the medium speed cutting machining of the titanium alloy. It is found that the cutting machining heat are increased as the cutting depth, feed rate, cutting time and spindle speed are raised.
A Study on the Prediction of Die Wear using Wear Model
Park, Jong-Nam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 90~96
During the cold forming, due to high working pressure acting on the die surface, failure mechanics must be considered before die design. One of the main reasons of die failure in industrial application of metal forming technologies is wear. Die wear affects the tolerances of formed parts, metal flow and costs of process etc. The only way to control these failures is to develop methods which allow prediction of die wear and which are suited to be used in the design state in order to optimize the process. In this paper, the wear experiments to obtain the wear coefficients and the upsetting processes was accomplished to observe the wear phenomenon during the cold forming process. The analysis of upsetting processes was accomplished by the rigid-plastic finite element method. The result from the deformation analysis was used to analyse the die wear during the processes and the predicted die wear profiles were compared with the measured die wear profiles.
Development of the Precision Positioning Mechanism by Nano Displacement Magnification Device
Park, Chang-Yong ; Kweon, Hyun-Kyu ; Zhao, Zhijun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 97~103
A new precision positioning mechanism for stage was been developed by Displacement Magnification Device(DMD) in this paper. The DMD was composed of the beam and multilayer piezoelectric actuators. The theoretical and experimental analysis of DMD to enlarge displacement more then 50times were discussed. And the 2-axis stage by using displacement amplification apparatus was added in the new DMD, and it was able to do it through finite element analysis and experiment. As the results, the magnification of DMD can be obtained about
displacement to the 10V input voltage(
). And the about 50nm of linearity error in the
measurement range and 20times of the amplification in displacement can be measured. In addition, the experimental results are confirmed the possibility of millimeter displacement characteristics and correspond to finite element analysis results.
A Study on the expectation of residual layer thickness in roller pressing imprint process
Cho, Young Tae ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 104~109
In order to apply nano imprint technology in large area process, roller pressing is promising because of its low cost and high productivity. When pressing mold by roller, liquid resin is locally squeezed between mold and substrate. In this study, the main focus is to understand which process parameter affects residual layer. To do this, a simple analytical model was introduced. Especially, we consider the aspect ratio of patterns as essential cause of variation of the thickness in the equation. As a result, when the aspect ratio of pattern in the mold increases, the thickness of residual layer also increases. In conclusion, we show that the uniformity of residual layer could be accomplished by the control of velocity and pressing force in roller pressing imprint process.
A Study on the Relationship between the Cutting Force and the Critical Ejecting Distance of Disk for a Mill Turret
Choi, Ji-Hwan ; Kim, Chae-Sil ; Cho, Su-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 110~116
Curvic coupling of mill turret should maintain disk weight and the cutting resistance which occurs the machining operation and must also have power transmission function. In order to improve machining operation range, the ejecting distance from curvic coupling to the disk must increase as much as possible. But moment is increased by the lack of capacity of the curvic coupling. Increase of moment is the cause of vibration/noise and degradation of machining performance not only stability problem. The manufacturer of mill turret has no the design information between the ejecting distance and the cutting resistance with safety of curvic coupling. Therefore this study describes a finite element analysis model of mill turret using ANSYS workbench. The structural analyses and modal analyses with varying of the ejecting distances and cutting resistances are performed. Finally the equation for relationship between the critical ejecting distance and the cutting resistance is defined under 5 of the safety factor for the maximum von-Mises stress at the curvic coupling.
Robust design of springback in U-channel forming using complex method
Yin, Jeong-Je ; Kim, Kyung-Mo ; Park, Jong-Cheon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 1, 2013, Pages 117~125
Variations of springback in stamped parts are induced by the uncontrollable noises including the variation of incoming material properties, lubrication and other forming process parameters. Reduction of springback variation is very important during springback compensation processes on stamping dies and assembly processes. To reduce the variation of springback, a robust optimization methodology which uses complex method combined with orthogonal array is proposed. The proposed method is applied to the robust design of U-channel die for the reduction of side wall curl. It is shown that the drawbead and die radius of U-channel draw die can be effectively optimized by the proposed method.