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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 22, Issue 6 - Dec 2013
Volume 22, Issue 5 - Oct 2013
Volume 22, Issue 4 - Aug 2013
Volume 22, Issue 3 - Jun 2013
Volume 22, Issue 3_1spc - Jun 2013
Volume 22, Issue 2 - Apr 2013
Volume 22, Issue 1 - Feb 2013
Selecting the target year
Characteristics of Al
, WC-Ni, and Chromizing Surface Coatingsunder Environment with HighTemperature, Wear, and Corrosion
Cho, Hee Keun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 895~900
DOI : 10.7735/ksmte.2013.22.6.895
Several plasma spray and metallurgical surface coatings such as
, WC-Ni, and chromizing coating have been examined for their application in environments with high temperature, wear, and corrosion. The chromizing coating is different from others coatings in the manufacturing process the surface. These coatings` characteristics were tested experimentally, and the results were compared. WC-Ni shows good performance against thermal barrier, wear, and corrosion and is one of the best candidates for the environment considered herein. These coatings were studied for their application in the steel manufacturing industry. The most commonly required functions in this industry are thermal and wear resistance.
Structural Analysis of Overloaded Multi-aerial Platform
So, Soo-Hyun ; Kang, Sung-Soo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 901~907
DOI : 10.7735/ksmte.2013.22.6.901
The development of high-rise firefighting vehicles warrants thorough structural analysis for ensuring vehicle stability. A few structural analyses were carried out using CAD data, material properties, load conditions, and boundary conditions for evaluating the structural stability of an overloaded multi-aerial platform for firefighting and rescue. Structural analysis was performed with an analytical model consisting of a turntable, six booms, two jib booms, and a basket structure. This model was operated in eight modes. All simulation was performed using NASTRAN, a commercial code. As a result, we confirm that the position of local stress exceeds that of the yield strength. Therefore, stress concentration relaxation is possible by introducing reinforcing boom structures, changing the shape, or imparting a larger moment of inertia to the booms` cross sections.
Prediction of the Effect of Cooling Fan Electrification on City Bus
Lee, Yongkyu ; Park, Jinil ; Lee, Jonghwa ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 908~912
DOI : 10.7735/ksmte.2013.22.6.908
Because of their longer operating times and larger size relative to conventional fans, the cooling fans mounted in buses consume larger amounts of energy. Most of the cooling fans mounted in a bus are connected to the engine by a viscous clutch. A viscous cooling fan`s speed is determined by its fluid temperature, which is affected by the air flow through the radiator. The fan does not react immediately to the coolant temperature and in doing so causes unnecessary energy consumption. Therefore, the fuel economy of buses using viscous fans can be improved by changing to an electric cooling fan design, which can be actively controlled. In addition, electric power consumption is increased by using electric cooling fans. Thus, when electric fans are applied in conjunction with the alternator management system (AMS), the fuel economy is further enhanced. In this study, simulations were performed to predict coolant temperature and cooling fan speeds. Simulations were performed for both viscous and electric cooling fans, and power consumption was calculated. Additionally, fuel economy was calculated applying both the alternator management system and the electric cooling fan.
Non-Contact Level on Air Levitation Table with Porous Chamber Array
Kim, Joon Hyun ; Jeong, Young Suk ; Lee, Tae Geol ; Kim, Tae Hoon ; Jung, Hyo Jae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 913~920
DOI : 10.7735/ksmte.2013.22.6.913
This paper presents an applicable basic design that can configure non-contact levitation table for conveying a large sheet of glass. The suggested air levitation table consists of a series of air chambers with porous pads and fans as the conveyor system. The air supply chambers are arrayed to supply an adequately strong upward airflow for supporting the glass. Levitation is controlled by the size and discharge velocity, of the chamber arrays, as well as the glass supporting height. After pre-evaluation of the glass rigidity and the filer functional performance, a one-way fluid structure interface (FSI) analysis is performed for predicting pressure and deflection working of the 8G glass in the transverse and longitudinal directions, respectively. After comparing calculated levels of flatness of the glass, it determines the chamber array for the linear non-contact conveying motion.
Production Efficiency Evaluation Considering Various Process Parameters
Kim, Chu ; Cho, YongJu ; Seo, Yoonho ; Jo, Hyunjae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 921~930
DOI : 10.7735/ksmte.2013.22.6.921
From an economic perspective, an enterprise`s business activity depends on the efficient use of corporate resources for generating profits. However, on the enterprise side, it is difficult to measure and evaluate the effective use of each resource. This paper suggests an alternative for eliminating process inefficiencies in the consolidation of competitive power in auto parts manufacturing company A. Multitudinous process variables from company A`s raw materials-to-shipment process are configured as input resources, and a Data Envelopment Analysis(DEA) is carried out to determine economical benefit of said resources` operation, as well as how products are manufactured. The DEA model offers a non-parametric approach to measuring relative efficiency using input and output factors. Furthermore, AHP is used for logically deciding the importance of each evaluation factor. In general, DEA models have been used for measuring efficiency of the service and public sectors. However, this study focused on measuring the efficiency of SMEs production lines.
Finite Element Analysis of Large-Electron-Beam Polishing-Induced Temperature Distribution
Kim, J.S. ; Kim, J.S. ; Kang, E.G. ; Lee, S.W. ; Park, H.W. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 931~936
DOI : 10.7735/ksmte.2013.22.6.931
Recently, the use of large-electron-beam polishing for polishing complex metal surfaces has been proposed. In this study, the temperature induced by a large electron beam was predicted using the heat transfer theory. A finite element (FE) model of a continuous wave (CW) electron beam was constructed assuming Gaussian distribution. The temperature distribution and melting depth of an SUS304 sample were predicted by changing electron-beam polishing process parameters such as energy density and beam velocity. The results obtained using the developed FE model were compared with experimental results for verifying the melting depth prediction capability of the developed FE model.
Design of Non-Contact Pick-Up Head for Carrying Large Flat Sheets
Kim, Joon Hyun ; Kim, Young Geul ; Ahn, Sung Wook ; Kim, Young Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 937~944
DOI : 10.7735/ksmte.2013.22.6.937
This paper describes an improved model that can be used for configuring a non-contact pneumatic head to handle a large sheet of glass. The cylindrical head model is of a large size (70 mm). It operates on vortex flow, which can simultaneously generate suction and repulsion over the flat object`s surface. The head allows for the minimal non-contact lifting of objects weighing over 3N by using reference conditions (working pressure and head dimensions). Additionally, a functional flow-guide is applied for inducing a developing tangential vortex flow to increase suction and repulsion to the reference head. The cylindrical flow-guide is associated with relatively low tangential velocity. The improved model generates greater lifting force than the reference model, as verified experimentally.
Research on In-vehicle, Real-time Measurement of Road Grades
Kim, Younggwan ; Park, Jinil ; Lee, Jonghwa ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 945~949
DOI : 10.7735/ksmte.2013.22.6.945
By using information about specific road grades, one can predict the power required by a vehicle. The prediction of the required power enables the driver to choose the driving route with the best fuel economy, which results in cost and energy savings. A clinometer is one of the more simple tools used to measure road grades, but requires significant time and effort. In this paper, a new method for measuring road grades from within a vehicle is proposed and experimentally verified.
Crack Detection in Beam using Sensitivity Coefficient of Modal Data
Lee, Jung Youn ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 950~956
DOI : 10.7735/ksmte.2013.22.6.950
This paper describes a sensitivity-coefficient-based iterative method for detecting cracks in a structure. The sensitivity coefficients of a cracked structure are obtained by changing its eigenvectors. The proposed method is applied to a cracked cantilever. The crack is modeled as a rotational stiffness. The predicted cracks are in good agreement with those from a structural reanalysis of the cracked structure.
Development of Collision Tester for Performance Evaluation of Safety Fence in Baseball Stadiums
Han, Eui Don ; Jang, Woong Ki ; Kho, Sun Tak ; Kwak, Ho Taek ; Seo, Young Ho ; Kim, Byeong Hee ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 957~962
DOI : 10.7735/ksmte.2013.22.6.957
This paper presents a performance testing device for safety fences of domestic professional baseball stadiums. Safety fences of professional stadiums have been fabricated and installed without adhering to any safety regulations, safety fences demonstrate critically low safety performances and many outfielders are severely injured every season. In this study, we designed and fabricated a performance testing device for safety fences and investigated its validity and reproducibility. A HIC (head injury criterion) was used for the statistical analysis of colliding data. We found that the optimal expulsion pressure and eliminated the accelerometer by replacing it with a velocity sensor using an estimation of the correlation between the momentum data obtained from velocity sensor and the impulse data from the accelerometer.
Impact Analysis of Freely Falling Cellular Phone
Kang, Sung-Soo ; Kim, Jong-Su ; Seol, Gyun-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 963~968
DOI : 10.7735/ksmte.2013.22.6.963
In this study, we carried out a structural analysis for determining the stresses acting on the tempered glass of a freely falling cellular phone using ANSYS 13.0, commercial finite element code. We designed a phone heavier than any contemporary cellular phone and performed finite element analysis using the falling speed at a height of 104 cm, which is equal to of the average leg length of Koreans. By determining the maximum stress acting on the phone`s tempered glass and frame, we identified the location of large deformation. Furthermore, we evaluated the maximum/minimum equivalent stress and deformation of the reinforced glass and frame as functions of time.
Structural Durability Analysis Related to Shape and Direction of Bicycle Frames
Cho, Jaeung ; Han, Moonsik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 969~975
DOI : 10.7735/ksmte.2013.22.6.969
While accelerating, bicycle frames are subject to torsion forces and deformation. In this study, bicycle frame durability was evaluated by using structural, fatigue, and vibration experiments. Three types of models were designed by changing the frame configurations according to the shape and direction of a bicycle frame design. Because maximum equivalent stress was greatest at the saddle and at connected parts in Models 1, 2, and 3, these frame sections were most vulnerable to failure. Model 2 was the least safe, due to the increased total deformation and equivalent stresses in the top tube horizontal to the ground. Based on vibration and fatigue analysis results, Model 2 was also determined to be the least safe frame, because the head tube was placed slightly higher above the seat tube and inclined to
. These study results can be utilized in the design of bicycle frames by investigating prevention and durability against damage.
Impact Characteristics of CFRP Structural Member according to the Variation of Stacking Condition and Impact Energy
Yeo, In-Goo ; Choi, Ju-Ho ; Choi, Yeong-Min ; Yang, Yong-Jun ; Hwang, Woo-Chae ; Yang, In-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 976~981
DOI : 10.7735/ksmte.2013.22.6.976
This aims to examine experimentally the absorption behavior and strength of circular CFRP members with different stacking configurations on exposure to a separate impact velocity. In addition, considered the dynamic characteristics. Circular and square CFRP members were prepared from 8-ply unidirectional prepreg sheets stacked at different angles (
, where the
direction coincides with the axis of the member) and interface numbers (2, 4, and 6). Based on the collapse characteristics of the circular CFRP members. In this study, for the circular members, the impact energies at crosshead speeds of 5.52 m/s, 5.14 m/s, and 4.57 m/s are 611.52 J, 529.2 J, and 419.44 J (at circular members), respectively. Likewise, for the square members, the impact energies at crosshead speeds of 2.16 m/s, 1.85 m/s, and 1.67 m/s are 372.4 J, 274.4 J, and 223.44 J (at square members).
Global Stage of Reproducibility Experiment for Single Point Diamond Turning
Park, Dae-Kwang ; Kwak, Nam-Su ; Kwon, Dae-Ju ; Kim, Jae-Yeol ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 982~988
DOI : 10.7735/ksmte.2013.22.6.982
With conventional positioning apparatus, it is very difficult to simultaneously achieve the desired driving range and precision at the sub-micrometer level. Generally, lead screw and friction drive, etc., 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.
A Study on Wear-type Defects of Part and Materials in Wind Power Generation
Kim, Sung-Hyun ; Choi, Seung-Hyun ; Jung, Na-Ra ; Yoon, Cheon-Han ; Kim, Jae-Yeol ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 989~995
DOI : 10.7735/ksmte.2013.22.6.989
Unlike fossil-or nuclear fuel-based power generation, wind power generation using inexhaustible wind energy is a pollution-free, hazardless power generation method. In this study, ultrasound thermography is used for fabricating specimens of wind power generator bearings and wind power generator supplement flanges, and an optimally designed ultrasound horn and ultrasound excitation system are used for detecting damage to part materials of a wind power generation setup. In addition, thermal flow analysis and ultrasonic thermography imaging are comparatively analyzed for improving the detection reliability in terms of surface and internal defects of part materials and for verifying the developed system`s field applicability and reliability.
Full Duplex Robot System for Transferring Flat Panel Display Glass
Lee, Dong Hun ; Lee, Chibum ; Kim, Sung Dong ; Cho, Young Hak ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 996~1002
DOI : 10.7735/ksmte.2013.22.6.996
This study addresses the development of a full duplex robotic system for transferring flat-panel display glass. We propose to accomplish this using a bidirectional linear transfer mechanism in place of the conventional rotary transfer mechanism. The developed full duplex robot comprises a driving part that carries the glass panel laterally, vertical part that can be moved up and down by means of a ball screw and linear motion guide arrangement, and hand part that slides by the cylinder of the driving part along the guide rail with a V-guide bearing attached to the bottom of the support. In addition, an alignment part prevents the hand part from derailing and holds the hand part while the driving part moves horizontally. The full duplex robot lifts and drives a glass panel directly while transferring it to the buffer and does not require rotational motion. Therefore, both transferring and stacking are realized with a single device. This device can be used in existing industrial facilities as an alternative to existing industrial robots in current as well as future process lines. The proposed full duplex robot is expected to save considerable amounts of time and space, and increase product throughput.
Prediction of Cutting Forces and Estimation of Size Effects in End Milling Operations by Determining Instantaneous Cutting Force Constants
Kim, Hong Seok ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 1003~1009
DOI : 10.7735/ksmte.2013.22.6.1003
This paper presents a simple procedure to obtain the instantaneous cutting force constants needed to predict milling forces. Cutting force data measured in a series of slot milling tests were used to determine the cutting force constants at different feed rates. The values of the cutting force constants were determined directly at the tool rotation angle that maximized the uncut chip thickness. Then, the instantaneous cutting force constant was obtained as a function of the instantaneous uncut chip thickness. This approach can greatly enhance the accuracy of the mechanistic cutting force model for end milling. In addition, the influences of several cutting parameters on the cutting forces, such as the tool helix angle and axial depth of cut, were discussed.
Novel Methods for Spatial Position Control of a Plate In the Conductive Plate Conveyance System Using Magnet Wheels
Jung, Kwang Suk ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 1010~1017
DOI : 10.7735/ksmte.2013.22.6.1010
Two-axial electrodynamic forces generated on a conductive plate by a partially shielded magnet wheel are strongly coupled through the rotational speed of the wheel. To control the spatial position of the plate using magnet wheels, the forces should be handled independently. Thus, three methods are proposed in this paper. First, considering that a relative ratio between two forces is independent of the length of the air-gap from the top of the wheel, it is possible to indirectly control the in-plane position of the plate using only the normal forces. In doing so, the control inputs for in-plane motion are converted into the target positions for out-of-plane motion. Second, the tangential direction of the open area of the shield plate and the rotational speed of the wheel become the new control variables. Third, the absolute magnitude of the open area is varied, instead of rotating the open area. The forces are determined simply by using a linear controller, and the relative ratio between the forces creates a unique wheel speed. The above methods were verified experimentally.
Addendum Surface Modeling in Draw Die Design for Stamping Automotive Panels
Chung, Yunchan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 1018~1024
DOI : 10.7735/ksmte.2013.22.6.1018
In the process of draw die design for stamping automotive press panels, the addendum surfaces generated in metal forming simulation software cannot be used in downstream processes such as machining and making draw dies because simulation tools use simple discrete models for the surface geometry. The downstream processes require more precise and continuous geometric models such as NURBS surfaces. Generally, automotive die engineers manually regenerate the addendum surface geometry using the discrete model. This paper presents an automated geometric modeling process for generating addendum surfaces using draft surface models. The design parameters of the section curve for the addendum surfaces are extracted automatically from the draft geometry. Using the extracted design parameters, smooth addendum surfaces are generated automatically as NURBS surfaces. The generated surfaces are
continuous with the part surface and the binder surface, and can be used in downstream processes.
Method of Controlling CAD Library Based on Part-shape Information Model for Bicycle Configuration Designs
Myung, B.S. ; Lee, J. ; Kim, B.C. ; Mun, D. ; Lee, H. ; Park, S.W. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 22, issue 6, 2013, Pages 1025~1031
DOI : 10.7735/ksmte.2013.22.6.1025
A library of parametric CAD models should be provided for the reuse of design data in configuration design. Mechanical products have many options and parameters, which in turn, require a large number of CAD models for configuration designs. Existing methods for library construction are limited in their ability to decrease the number of CAD models and ensure independency between the configuration design system and the library. To solve these problems, we propose a method that controls a CAD library based on part-shape information model, and also present its technical details. To verify the proposed method, a CAD library for bicycles was constructed and design modification experiments using a prototype part-shape controller were performed. From the experiments, we found that the proposed method can effectively decrease the required number of CAD models by reusing models for configuration designs.