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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
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Volume & Issues
Volume 9, Issue 6 - Dec 2010
Volume 9, Issue 5 - Oct 2010
Volume 9, Issue 4 - Aug 2010
Volume 9, Issue 3 - Jun 2010
Volume 9, Issue 2 - Apr 2010
Volume 9, Issue 1 - Feb 2010
Selecting the target year
Development of machining technology for non-continuous pattern removing plastic deformation around pattern
Jeon, Eun-Chae ; Je, Tae-Jin ; Chang, Sung-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 1~6
Patterned optical components are widely used for optical products such as LCD and lighting. Since CCFL was used as a light source in the products, prism films having linear continuous optical patterns were widely used. However, LED which is a dot light source is popular recently, therefore, the optical products need new optical components having non-continuous optical patterns. Indentation machining method is a powerful method for machining of non-continuous pattern. When a copper mold and a brass mold were machined by this method, severe plastic deformation called pile-up was observed around the patterns. Since pile-up has negative relationship to ductility, this deformation can be eliminated by annealing treatment which makes the materials ductile. No plastic deformation occurred when machined after annealing at
for copper and brass, respectively. Finally, non-continuous optical patterns with high quality were machined on a copper mold and a brass mold successively.
A Study on Mechanical Property of SM53C Steel by High Frequency Induction Hardening
Kim, Hwang-Soo ; Kim, Jung-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 7~15
Recently, with the high performance and efficiency of machine, there have been required the multi-functions in various machine parts, such as the heat resistance, the abrasion resistance and the stress resistance as well as the strength. Fatigue crack growth tests were carried out to investigate the fatigue characteristics of high carbon steel (SM53C) experienced by high-frequency induction treatment. The Cam nose part of the Automobile's Cam shaft is strongly bumped with rocker arm or valve-lift. Therefore abnormal wear such as unfair wear and early wear occur in the surface. This abnormal wear causes a defect that bad timing open and close actions of the engine valve happen in the combustion chamber so the fuel gas will be combustion imperfect. Therefore, the cam shaft demands high hardness and wear resistance. In this study, high frequency heat treatment has been accomplished while wear test for material SM53C.
Durability Assessment of a Control Arm Using 1/4 Car Test
Ha, Min-Soo ; Son, Hwan-Jung ; Kim, Jong-Kyu ; Park, Young-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 16~20
This study proposes a structural design method for the upper control arm installed at the rear side of a SUV. The weight of control arm can be reduced by applying the design. In this research, the former includes optimization technology, and the latter the technologies for selecting aluminum as a steel-substitute material. Strength assessment is the most important design criterion in the structural design of a control arm. At the proto design stage of a new control arm, FE (finite element) analysis is often utilized to predict its strength. In this study, the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint and durability criteria. The optimum results determined from the in-house program are compared with those of ANSYS WORKBENCH. The durability assessment is obtained by a index of fatigue durability and trial & error method, MSC. Fatigue program.
A Study on Determining Optimal Gate Positions for Cavity Fill-Uniformity in Injection Molding Design
Park, Jong-Cheon ; Seong, Yeong-Kyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 21~28
This study shows an optimization procedure for an automatic determination on the gate position to ensure the fill-uniformity within a part cavity by using the injection molding simulation. For an optimization, the maximum pressure-difference within a part cavity induced at the stage of filling is used to evaluate degree of fill-uniformity. In addition, a direct search scheme based on the reduction of design space is developed and applied in the optimization problem. This corresponding proposed methodology was applied in the optimization on the gate location for a CD-tray molding, as a result, showed the improvement of the fill-uniformity within the cavity.
A Study on Surface Roughness of Al alloy 7075 to Cutting depth in High-speed Machining
Park, Eun-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 29~35
Recently the industry high-speed machining has been applied to the automotive, aircraft, electronics parts machining because the effect of cost savings, machining time reduction and productivity improvement. In this study recently the aircraft structural aluminum alloy 7075 used in cutting the ball end-mill on the surface roughness terms most affect the parameters of the spindle speed and feed rate on the surface roughness of the work-piece according to the cutting depth is to investigate. Cutting depth at 0.3 mm has the lowest surface roughness.
Study on the frequency analysis of the leaf spring
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 36~42
In this study, the deformation and stress are analyzed through modal and harmonic response analysis at resonance on leaf spring. The displacement range of 7 to 14 mm is shown at natural frequencies as 6 kinds of resonance modes. The maximum deformation is shown as 8.8781mm at Mode 2. The maximum displacement and stress at leaf spring are shown as 0.0458 mm and 72.533 MPa respectively on 1200 Hz. The comfortability of passenger becomes better on leaf spring at suspension system by use of this design model.
Structural Analysis of Vehicle Side Door at Overturn
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 43~50
This study aims to analyze the structural safety by comparing deformation and equivalent stress of door with a stiffener or no stiffener when the door crashes against something in case of overturn. Three types are classified on the basis of the no stiffener model in the vehicle door. One is the type which has a stiffener. Another is the type which has no stiffener and the other is the type which has a hole in the stiffener. These three types are compared with each other by analyzing. This side door of vehicle is the automotive part about the kind of vehicle as Mercedes Benz E-Klasse scaled down as 1/18 times as the real size. The study model of vehicle door is modelled by CATIA program and it is analyzed by ANSYS.
Modeling and Motion Control of the Precision Positioning Stage with Flexible Hinge Mechanism
Kim, Yeung-Shik ; Kim, Jai-Ik ; Kim, In-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 51~58
This paper suggests a control technique of the two axes precision stage. The stage is supported by four flexible spring hinges and driven by two piezoelectric actuators. The dynamic motion of the stage is analysed by the finite element method and identified by the frequency domain modeling technique based on the experimental data. The sliding mode control with integrator is applied to improve the tracking ability of the stage to the complex reference input signal. Experimental results demonstrate that the proposed modeling schemes and control algorithm can be used effectively for the two axes stage.
Characteristic of Refrigerant for Heat-treatment Deformation Control of SCM415 Steel
Ahn, Min-Ju ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 59~65
This study deals with the characteristic of refrigerant for heat-treatment deformation control of SCM415 steel. The control of heat-treatment deformation must need the progress of production parts for an industry machine. Most of the deformation is occurred on unequal cooling. The unequal cooling is occurred by a property of quenching refrigeration. When a heated metal is deposited in the refrigeration, the cooling speed is so slow in early period of cooling because of occurring a steam-curtain. After more cooling, the steam-curtain is destroyed. In this progress, the cooling speed is very fast. The object of this study is to control the deformation of heat-treatment for the part of the industry machine by improving the conditions of quenching. The cooling curves and cooling rates of water, oil and polymer solution are obtained and illustrated. From the characteristics of the quenching refrigerant, the effects of heat-treatments on the thermal deformation and fatigue strength are also investigated.
Micro Milling using High Frequency 2-dimensional Vibration
Kim, Gi-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 66~70
Using two piezoelectric materials orthogonally arranged, 2-dimensional(2D) vibration in a excitation workpiece table was generated. In this study, micro milling using high frequency 2D vibration was proposed, whose locus of cutting tool is combined with original trochoid locus of milling tool and 2D elliptical locus of excitation table. From the cutting results of 2D vibrational micro milling of nickel alloy, it was observed that the machining quality and the roughness of machined surface were enhanced compared to conventional milling in a side cutting whose immersion ration is relatively low, whereas there was little betterment in a slot cutting.
Evaluation of Statistical distribution of extreme values of Graphite in Ductile Cast Iron by Image Analyzer
Yoon, Myung-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 71~77
Although the problems of defects and nonmetallic inclusion in metal fatigue are very complicated, it is particularly important to view these problems from the perspective that defects and inclusions are virtually equivalent to small cracks. This concept will help one to understand various fatigue phenomena caused by Ductile Cast Iron. For different ferrite-pearlite matrix structure, containing more than 90% spheroidal ratio of graphite, GCD 45-3, GCD 50, GCD 60 series and 70%, 80%, 90% spheroidal ratio of graphite, GCD 40, GCD 45-1, GCD 45-2 series, this paper has carried out image analyzer, estimated maximum and mean size of graphite, investigated correlation. It was concluded as follows. (1) A good quality of Ductile cast iron using in this experiment, the graphite was separated well. The effect of the interaction by graphite was verified by microscopic observation and by fracture mechanics investigation in surface, interior of the specimen. (2)
of graphite can be used to predict fatigue limit of Ductile Cast Iron. The Statistical distribution of extreme values of
may be used as a guide line for the control of inclusion size in the steel making processes.
Study on Method of Crack Detection of L-beams with Coupled Vibration
Son, In-Soo ; Cho, Jeong-Rae ; Ahn, Sung-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 78~86
This paper aims to investigate the natural frequency of a cracked cantilever L-beams with a coupled bending and torsional vibrations. In addition, a theoretical method for detection of the crack position and size in a cantilever L-beams is presented based on natural frequencies. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by using extended Hamilton's Principle. The dynamic transfer matrix method is used for calculation of a exact natural frequencies of L-beams. In order to detect the crack of L-beams, the effect of spring coefficients for bending moment and torsional force is included. In this study, the differences between the actual data and predicted positions and sizes of crack are less than 0.5% and 6.7% respectively.
A Basic Study of Planning Walking Pattern by developing a New Biped Robot-Simulator
Park, Chang-Young ; Kweon, Hyun-Kyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 87~93
In this paper, a new simulator of the biped robot for planning walking patterns was showed. And this simulator(MHBiped) is able to not only visualize the plan of patterns but also verify whether a biped robot design is suitable. In addition, MHBipd can modify various kinds of walking parameters and the trajectory of biped robot. Therefore, a new biped robot can be designed easily by the this simulator before you apply to a robot. As a result, a well-balanced parameters of walking patterns watching the movement of CG and ZMP can be obtained. Walking patterns should be changed according to both the existence of obstacles and conditions of ground and it can be described by the trajectory of hip and ankles. All those trajectorys can be also obtained by the cubic spline functions and the way of modeling walking patterns. The results of simulator, the movement function of CG and ZMP, the cubic spline functions and modeling of biped robot were introduced in this paper. And the effectiveness of this simulator was confirmed by the simulations.% respectively.
Prediction of the Bending Effect of an Archwire for Orthodontics
Lee, Kee-Joon ; Cho, Young-Soo ; Kim, Si-Pom ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 95~100
For orthodontic treatment, most commonly, an archwire is inserted into orthodontic brackets that can be made from stainless steel. Then, the archwires interact with the brackets to move teeth into the desired positions. However, the activation of an archwire may induce undesirable rotation of a tooth due to the moment application. An appropriate magnitude of the gable bends of an archwires prevents its rotation. However, it is not easy to predict the relationship between the rotation and the gable bend. This study presents the numerical approach to predict the rotation of a tooth with respect to the gable bend in the activation of an archwire. To predict the rotation of a tooth, the kriging interpolation method is introduced.
Optimization of Pre-form for Manufacturing of Automobile Drum Clutch Hub Products Using Taguchi Method
Kim, Seung-Gyu ; Park, Young-Chul ; Park, Joon-Hong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 6, 2010, Pages 101~108
The drum clutch investigated in this study is formed in 5 forming steps, which are 1st deep drawing, 2nd deep drawing, restriking, embossing, and
processes. Dimensional accuracy of the final products greatly depends upon how much more accurate pre-form is manufactured in the previous forming processes before the
process. The deep drawing, restriking and embossing processes in which the pre-form is formed are very important and decisive steps. Thus in some cases, excessive strain by these operations causes dimensional inaccuracy and cracks initiated from the base and wall of the product. Process variables such as the punch shapes both of 1st and 2nd deep drawing, and punch angle were selected to evaluate the deformation characteristics. The optimum parameters were determined from forming simulations using commercial FEM codes, DEFORM and Tauchi method, specifically developed for metal forming simulation. Finally, experiments for the whole drum clutch forming processes were carried out to verify the optimized forming parameters and the analytical results.