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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 7, Issue 4 - Dec 2008
Volume 7, Issue 3 - Sep 2008
Volume 7, Issue 2 - Jun 2008
Volume 7, Issue 1 - Mar 2008
Selecting the target year
A Robust Design Using Approximation Model and Probability of Success
Song, Byoung-Cheol ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 3~11
Robust design pioneered by Dr. G. Taguchi has been applied to versatile engineering problems for improving quality. Since 1980s, the Taguchi method has been introduced to numerical optimization, complementing the deficiencies of deterministic optimization, which is often called the robust optimization. In this study, the robust optimization strategy is proposed by considering the robustness of objective and constraint functions. The statistics of responses in the functions are surrogated by kriging models. In addition, objective and/or constraint function is represented by the probability of success, thus facilitating robust optimization. The mathematical problem and the two-bar design problem are investigated to show the validity of the proposed method.
Structural Safety Analysis of Car Body
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 12~16
The state of deformation and stress and the structural safety are studied at the main frame composed with car body by the impact of front, offset and overturn in this study. The values of maximum deformation and von-Mises stress in case of offset impact are 2 to 3 times as high as those in case of front or offset impact at the parts of front and middle legs of roll cage. The case of front impact is of the greatest safety as compared with the case of offset or overturn impact. As there is a great stress on the side in case of overturn impact, this value is more than 2 times as low as that in case of offset impact. But there is a great possibility of overturn by the buckling on both sides in case of overturn impact.
Structural Design of a Container Crane Part-Jaw, Using Metamodels
Song, Byoung-Cheol ; Bang, Il-Kwon ; Han, Dong-Seop ; Han, Geun-Jo ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 17~24
Rail clamps are mechanical components installed to fix the container crane to its lower members against wind blast or slip. According to rail clamps should be designed to survive harsh wind loading conditions. In this study, a jaw structure, which is a part of a wedge-typed rail clamp, is optimized with respect to its strength under a severe wind loading condition. According to the classification of structural optimization, the structural optimization of a jaw is included in the category of shape optimization. Conventional structural optimization methods have difficulties in defining complex shape design variables and preventing mesh distortions. To overcome the difficulties, the metamodel using Kriging interpolation method is introduced to replace the true response by an approximate one. This research presents the shape optimization of a jaw using iterative Kriging interpolation models and a simulated annealing algorithm. The new Kriging models are iteratively constructed by refining the former Kriging models. This process is continued until the convergence criteria are satisfied. The optimum results obtained by the suggested method are compared with those obtained by the DOE (design of experiments) and VT (variation technology) methods built in ANSYS WORKBENCH.
A Study on the Injection Flow with Viscoelastic Effect
Jeon, Eon-Chan ; Park, Jung-Woo ; Kim, Soo-Yong ; Lee, Chul-Jang ; Ahn, Kwang-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 25~29
In this paper, we design internal space in plunger-type low pressure vacuum injection molding machine from numerical study. And we study characteristic of viscoelastic flow for searching injection molding condition. Then the flow analysis was performed using the CAE S/W. The result shows optimal value of nozzle and hole in injection chamber. And we investigated qualitatively relationship between injection pressure and injection mass flow with variable shear rate
A Study on the Development of a Step Cutter with Hybrid Process of Drilling and Boring
Hwang, Jong-Dae ; Heo, Yun-Nyoung ; Oh, Ji-Young ; Jung, Yoon-Gyo ; Cho, Sung-Lim ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 30~35
As demands for being economical, precise drilling process is on the increase. Therefore, the objective of this study is to develop a step cutter that can be controllable through micro dimension and can be changed from separate manufacturing processes of drilling and boring into an integrated one. In order to attain this object the step cutter is designed with a 3D geometric modeling and the design could be modified easily by using parametric modeling methodology. Also, collision is not occurred during manufacturing process because of cutting simulation. The step cutter is assembled by parts made up of 5-axis machining and sintering. Validation tests are accomplished. They show that developed cutter has characteristics such as reduction of machining time as well as the good surface roughness of the machined hole. Indeed, reliability could be obtained from a durability test.
Static and Dynamic Analysis of Automotive Steering System
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 36~40
This study is analyzed by the simulation of automotive steering system. The maximum equivalent stress of
and the maximum total displacement of 0.014929m are shown at the universal joint and its lower part respectively. As the minimum cycle of 34.047 is shown at the universal joint in case of fatigue analysis, it is possible to have greatest damage at this part. In case of natural frequency analysis at vibration, its frequency of 47 to 59Hz is occurred generally. The maximum total displacement of 0.5m is shown at handle on the natural frequency of 57 to 58Hz. And the displacement over 2m is shown at the lower part of universal joint on the natural frequency of 58 to 59Hz. As the basis of the simulation analysis of steering system, passenger's comfort of car body can be improved in the design of practical part and the design effect necessary to safe driving can be promoted.
Study on Fabrication of a Large Concave Mirror Surface Using a Swing-Arm Type Profilometer
Lee, Ki-Am ; Kim, Ock-Hyun ; Lee, Eung-Suk ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 41~46
Generally optical components are fabricated by grinding, lapping and polishing processes. Those processes take long time to obtain optical high surface quality. In the case of large optical components, the on-machine measurement is strongly recommended because the workpiece is fragile and difficult to set up for fabricating and measuring. This paper is concerned about a swing-arm mechanism which can be used for on-machine measurement of a surface profile with a sensing probe end-effect, and also for grinding or lapping the surface with a corresponding tool. The measuring accuracy and uncertainty using a swing arm type profilometer have been studied. The experimental results show that this method is useful specially in lapping process with the accuracy of
. Those inspection data are provided for correcting the residual figuring error in next processes.
A Study on Forming for Brake Pipe of Automobiles using Finite Element Method
Min, Byeong-Hyeon ; Jea, Wone-Soo ; Ye, Sang-Don ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 47~49
The brake pipe is important part in automobile. The brake pipe have to prevent crack, fracture and defects for braking in safety. Especially, shape of ends of pipe has influence on ability of brake. Based on the procedure of process design, in this paper, the forming operation is designed by finite element method. Design variable and response value was selected shape of die and damage factor. To improve die that performed FEM and compared results of two types of die.
Ductile Simulation Analysis at Heat Exchanger
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 50~54
This study is analyzed by the simulation of heat exchanger. As heat conduction happens as contact begins, the temperature increases until
at the contact part. The displacement increases until 33mm at its maximum and maximum equivalent stress at final stage increases 20 times as much as that of first contact. The expenses about maintenance, repair and management of parts can be reduced largely by applying the simulation about various parts of heat exchanger.
Roughness Characteristics of Turned Surface by Wiper Tool
Lee, Young-Moon ; Ryu, Chung-Won ; Son, Jae-Hwan ; Kim, Sun-Il ; Jung, Hee-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 55~60
Until a recent date, the surface finish generated in turning by the conventional cutting tool is directly related to the feed rate and the size of the tool nose radius. With this tool a large feed rate will give poorer surface finish and a large nose radius will generate a better surface finish. Recently a new concept in the tool design is introduced to achieve a better surface finish at a higher feed rate. This is the wiper tool, which has the portion of nose with infinite radius. This can remove the ridges left when the conventional tool is used. In this study two series of cutting tests with the wiper tool and the conventional tool are carried out under the various cutting conditions of cutting depth, feed rate and cutting speed. The effects of the wiper design and the cutting conditions on the surface roughness resulted are carefully examined and compared.
Effect of Process Parameters on Residual NCO and Viscosity of Pre-Polymers
Kim, Sang-Oh ; You, Man-Hee ; Ha, Man-Kyung ; Kwak, Jae-Seob ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 61~66
For the production of urethane prepolymer, the effect of process parameters such as diisocyanate MDI and polyol TDI was tested. In this paper, design of experiments has been adopted for studying the effect of the process parameters on the improvement of NCO and viscosity of pre-polymer. As a result of comparison of different parameters, the effect of polyol was stronger than that of isocyanate in comparison of reactivity according to the amounts of isocyanate and polyol. Especially, NCO and viscosity of pre-polymer affected a product safety.
The Study on the WEDM of Polycrystalline Diamond
Kim, Chang-Ho ; Kang, Jae-Won ; Oh, Jang-Uk ; Seo, Jae-Bong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 67~74
Polycrystalline diamonds(PCD) tools are widely used in machining a large variety of advanced materials. However, the manufacture of PCD tool blanks is not an economical process. The shaping of PCD blanks with conventional machining methods(such a grinding) is long, labor-intensive process. This paper reports experimental investigation of the influence of electrical machining conditions on the metal removal rate of WEDM of PCD. Experimental results show that the longer pulse-on time and the shorter pulse-off time increase the metal removal rate and worsen the surface quality. The smaller grain size of diamond yields the metal removal rate and shows the better surface quality. Higher electrical conductivity of water yields worse surface roughness.
A Study on the Multi-row Progressive Die for Thin Sheet Metal Forming by Computer Simulation
Sim, Sung-Bo ; Kim, Chung-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 75~80
The progressive die performs a work of sheet metal processes with a piercing, notching, embossing, bending, drawing, cut-off etc. in many kinds of pressing. Now a days, these processes have been evaluated as a advanced tooling method to increase the productivity and high quality assurance. The first step analyzing of die design is production part review, then the arrangement drawing of product design and strip process layout design should be done as a next steps with a FEM simulation for its problem solution. After upper procedure were peformed, it was started to make the die, then tryout and its revision of the die and product quality, safety, productivity etc. were done continually. For the all of these process, we mobilized the theory and practice of sheet metal forming, die structure, the function and activity of die components, and the others of die machining, die material, heat treatment and know‐how so on. In this study the features of representative are production part analyzing through the FEM simulation of bending area with a considering spring back problem by DEFORM.
A curvature profilometry using white-light
Kim, Byoung-Chang ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 81~86
I present a 3-D profiler specially devised for the profile measurement of specular surfaces that requires precision shape accuracy up to a few nanometer. A profile is reconstructed from the curvature of a test part of the surface at several locations along a line. The local curvature data are acquired with White-light Scanning Interferometry. Test measurement proves that the proposed profiler is well suited for the specular surface inspection like precision mirror.
A decision making framework model for the selection of a RP using hybrid multiple attribute decision making techniques
Byun, Hong-Seok ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 87~95
The purpose of this study is to provide a decision support to select an appropriate rapid prototyping(RP) machine that suits the application of a part. Selection factors include concept model, form/fit/functional model, pattern model for molding, material property, build time and part cost that greatly affect the performance of RP machines. However, the selection of a RP is not an easy decision because they are uncertain and vague. For this reason, the aim of this research is to propose hybrid multiple attribute decision making approaches to effectively evaluate RP machines. In addition, because subjective considerations are relevant to selection decision, a fuzzy logic approach is adopted. The proposed selection procedure consists of several steps. First, we identify RP machines that the users consider. After constructing the evaluation criteria, we calculate the weights of the criteria by applying the fuzzy Analytic Hierarchy Process(AHP) method. Finally, we construct the fuzzy Technique of Order Preference by Similarity to Ideal Solution(TOPSIS) method to achieve the ranking order of all machines providing the decision information for the selection of RP machines.
Theoretical Modeling for the Prediction of Face Milling Forces
Kim, Kug-Weon ; Lee, Woo-Young ; Choi, Sung-Joo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 96~102
In order to design establish automation or optimization of the machining process, predictions of the forces in machining are often needed. In this paper, a theoretical model in face milling is presented based on Oxley's predictive machining theory, where the cutting forces are predicted from input data of fundamental work material properties, tool geometry and cutting conditions without any preliminary cutting experiment. A simulation system for the cutting forces in face milling is developed using the model. Milling experimental tests are conducted to verify the model and the predictive results are compared and discussed with the experimental results.
Trajectory Tracking Control of Hydraulic Cylinder Preventing from the Unbalance State
Choi, Jong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 103~109
The work to raise the bridge plate by using two hydraulic cylinders is very dangerous when generating the unbalance state between cylinders. For solving this problem, one cylinder is forced to follow the trajectory of another cylinder instead of applying the same trajectory to two cylinders at once. In this paper, the control method for dynamic stable on lifting the bridge plate is proposed. The simulation model is derived by using commercial software, AMESim and MatLab/simulink. The PID controller is designed on one cylinder for following the reference trajectory and the adaptive controller is designed on another cylinder for tracking the displacement of one cylinder. The performance improvement is shown by comparing the simulation results through computer simulation.
Wear Characteristics of Dental Prosthesis
Choi, Won-Sik ; Kim, Won-Ku ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 7, issue 3, 2008, Pages 110~114
In this study, to examine the friction coefficient and wear amount of dental prosthesis, pin-on-disk type wear test were at room temperature. Vickers hardness and fracture toughness measurement of dental materials were preformed. Microscopic observations on worn surfaces of specimens were conducted by SEM. The friction coefficient of dental material was investigated according to weight and slinging velocity. dental material have investigated composed to nature teeth.