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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Transactions of Materials Processing
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Journal DOI :
The Korean Society for Technology of Plasticity
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Volume & Issues
Volume 19, Issue 8 - Dec 2010
Volume 19, Issue 7 - Nov 2010
Volume 19, Issue 6 - Oct 2010
Volume 19, Issue 5 - Aug 2010
Volume 19, Issue 4 - Jul 2010
Volume 19, Issue 3 - Jun 2010
Volume 19, Issue 2 - Apr 2010
Volume 19, Issue 1 - Feb 2010
Selecting the target year
A Study on the Fabrication of Nano-Pattern Mold Using Anodic Aluminum Oxide Membrane
Oh, J.G. ; Kim, J.S. ; Kang, J.J. ; Kim, J.D. ; Yoon, K.H. ; Hwang, C.J. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 73~78
DOI : 10.5228/KSPP.2010.19.2.073
Recently, many researches on the development of super-hydrophobic surface have been concentrated on the fabrication of nano-patterned products. Nano-patterned mold is a key to replicate nano-patterned products by mass production process such as injection molding and UV molding. The present paper proposes the new fabricating method of nano-patterned mold at low cost. The nano-patterned mold was fabricated by electroforming the anodic aluminum oxide membrane filled with UV curable resin in nano-hole by capillary phenomenon. As a result, the final mold with nano-patterns which have the holes with the diameter of 100~200 nm was fabricated. Furthermore, the UV-molded products with clear nano- patterns which have the pillars with the diameter of 100~200nm were achieved.
An Optimum Design of Pipe Bending Process Using High Frequency Induction Heating and Dynamic Reverse Moment
Lee, H.W. ; Jung, S.Y. ; Woo, T.K. ; Kim, C. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 79~87
DOI : 10.5228/KSPP.2010.19.2.079
The Pipe bending process using high frequency local induction heating is an advanced technique to bend pipes with a small bending radius and a large diameter. Even though the pipe bending process is a quite widespread engineering practice, it depends heavily upon trial and error method by field engineers with several years of experience. So it is necessary to develop an integrated methodology for optimum design of the pipe bending process. During hot pipe bending using induction heating, outward wall thickness of a pipe is thinned due to tensile stress and the reduction of wall thickness is not allowed to exceed 12.5%. Taguchi method and dynamic reverse moment is proposed to maintain a reduction ratio of thickness within 12.5%, when D/t ratio is high. An application of the proposed approach was compared with those of the finite element analysis and has good in agreements.
A Study on Structure Analysis and Fatigue Life of the Common Rail Pipe
Song, M.J. ; Jung, S.Y. ; Hwang, B.C. ; Kim, C. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 88~94
DOI : 10.5228/KSPP.2010.19.2.088
The next generation of diesel engine can operate at high injection pressure up to 1,800bar. The common rail pipe must have higher internal strength because it is directly influenced by the high-pressure fuel. Folding defects in the Common rail pipe can not ensure the structural safety. Therefore, Preform design and fatigue-life analysis are very important for preventing the head of the common rail pipe from folding in the heading process and for predicting fatigue life according to the amount of folding. In this study, a closed form equation to predict fatigue life was suggested by Goodman theory and pressure vessels theory in ASME Code in order to develop an optimization technique of the heading process and verified its reliability through fatigue-structural coupled field analysis. The results calculated by the theory were in good agreement with those obtained by the finite element analysis.
The Effect of Drawing and Heat Treatment on Fatigue Life and Machinability in Free Machining Steel
Suh, C.H. ; Kim, D.B. ; Oh, S.K. ; Jung, Y.C. ; Park, M.K. ; Kim, Y.S. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 95~100
DOI : 10.5228/KSPP.2010.19.2.095
Drawing and normalizing are efficient means for controlling strength, fatigue and machinability of free machining steel. Normally strength and machinability are conflicting properties which need to be optimized. In this study, the effects of normalizing temperature and reduction of area on strength, fatigue and machinability were investigated. Fine grains were generated at lower normalizing temperature and fatigue life was increased with decreasing grain size. Matrix was work hardened and elongated with increasing reduction of area. Inclusions also were elongated and cross-sectional area of inclusions along drawing axis was decreased. The effects of work hardening and grain size on fatigue life were significant, but only work hardening affected machinability. Shape and distribution of inclusions after drawing had little effect on fatigue life and machinability.
Rolling Process and Roll Stress Analysis of CB100 using by 3D FEM
Kim, J.M. ; Park, C.S. ; Woo, K.M. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 101~106
DOI : 10.5228/KSPP.2010.19.2.101
CB100 is one of the channel type products in the steel beam. In this study, rolling process of CB100 is analyzed by 3D FEM simulation and rolling process. FEM simulation result is compared with rolling process data. Also the intermediate & finishing roll stress analysis is carried out and the suitability of the roll through roll stress resultant analysis is evaluated. In order to decrease the roll stress, new pass schedule is developed for stable load balance between intermediate and finishing rolling stand. Therefore new rolling pass schedule is verified by the analysis results of rolling process and roll stress. By the analysis results, the credibility of rolling process analysis was obtained and it was determined that the possibility of roll damage between intermediate and finishing mill was high. So the new pass schedule was developed. Through the result of rolling process and roll stress analysis, it was obtained that the reduction of roll stress and stable load balance.
Study on Micro Endmilling Process for Manufacturing of Very Small Gear Parts and Mold with Two-Stage
Je, T.J. ; Noh, J.S. ; Kim, B.D. ; Kim, J.G. ; Yoon, J.S. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 107~112
DOI : 10.5228/KSPP.2010.19.2.107
A multi-stage gear mold including gears of 2mm and 1.5mm diameter was designed and machined in this research for developing micro gear mold manufacturing technology with micro endmill. Mechanical shapes having differential micro teeth were analyzed to be formed as designed and processing conditions were optimized by analyzing machined surface chip and cutting force. Based on the results, a prototype of micro multi-stage gear mold was manufactured.
Effect of Process Parameters on Forming Characteristics of Flange Hydroforming Process
Lee, H.J. ; Joo, B.D. ; Choi, M.K. ; Moon, Y.H. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 113~119
DOI : 10.5228/KSPP.2010.19.2.113
Hydroforming is the technology that utilizes hydraulic pressure to form tube or sheet materials into desired shapes inside die cavities. Tube hydroforming provides a number of advantages over the conventional stamping process, including fewer secondary operations, weight reduction, assembly simplification, adaptability to forming of complex structural components and improved structural strength. In many case, hydroformed parts have to be structurally joined at some point. Therefore it is useful if the hydroformed automotive parts can be given a localized attachment flange. In this study for the numerical process design FE analysis was performed with DYNAFORM 5.5. Die parting angle and circumferential expansion ratio was optimized. With optimized condition, bulge and hydroforming experiments to form flange were performed. Forming characteristic at various pressure conditions was analyzed and optimized internal pressure condition was evaluated. The results show that flanged parts can be successfully produced by tube hydroforming process.
A Study on the Application of Line Array Roll Set Process for the Manufacture of Real Ship Hull Plates
Shim, D.S. ; Yang, D.Y. ; Chung, S.W. ; Han, M.S. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 120~126
DOI : 10.5228/KSPP.2010.19.2.120
The line array roll set(LARS) process, as one of many kinds of incremental forming processes, is a continuous process in which a flat metal plate is formed into a singly or doubly curved plate through successive passes of forming rolls. It was found that the curvature level of the formed plates in the previous study was well over the curvature required in shipyards. This fact shows that the LARS method has good potential for shipbuilding applications. The major purpose of the present study is to estimate experimentally the general applicability of the line array roll set process for the manufacture of ship hull plates. In this study, the target shapes are selected through investigation of the shape classification of ship hull plates that comprise a certain vessel. Forming processes for twisted shapes are analyzed with the finite element method(FEM) and the results of experimental work are presented. On the basis of the experimental and numerical results, the LARS process is applied to the production of real outer hull plates of a small patrol ship.
A Study on the Analysis of Forming Process for Swash-Plate by Using Prepreg
Kim, K.S. ; Yoon, H.K. ; Shin, J.Y. ; Hur, K.D. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 127~131
DOI : 10.5228/KSPP.2010.19.2.127
Carbon-epoxy prepreg has been introduced in the forming of the upper and lower swash plates that control the pitch of rotor blade of unmanned helicopter because of its lightweight. Taguchi experimental method has been used by introducing the variables such as arrangement angle, laminated number and forming temperature, in order to obtain the proper forming method by using prepreg satisfying the required strength of the swash plate. In the evaluation of structural safety for the swash plates, three kinds of models are considered by using FE-analysis. In comparison of the hot forged products with Al6061-T6 and the formed products with prepreg, it was found that ultimate tensile strength of the products with prepreg is three times higher than that of the Al6061-T6, and the weight reduction of 68.5g can be achieved by using prepreg swash plates.
Optimization of Process Variables of Shape Drawing for Steering Spline Shaft
Lee, S.K. ; Kim, S.M. ; Lee, S.B. ; Kim, B.M. ;
Transactions of Materials Processing, volume 19, issue 2, 2010, Pages 132~137
DOI : 10.5228/KSPP.2010.19.2.132
In the multi-pass shape drawing process, the appropriate process design is very important to produce sound products. The reduction ratio, die angle, and the intermediate die shape are very important process variable of the multi-pass shape drawing. The aim of this study is the determination of the reduction ratio, die angle, and the intermediate die shape of the 2 pass shape drawing process for producing steering spline shaft. In this study, FE analysis, Taguchi method, and ANN(artificial neural network) were applied to determine the appropriate reduction ratio, die angle, and intermediate die shape. After the determination of the process variables, FE analysis and drawing experiment were performed to evaluate the effectiveness of the determined process variables. The dimensional accuracy of the final drawn spline shaft was evaluated by using 3D surface profiler and 3D laser digitizing system.