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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
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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
A Study on Micro ED-Drilling of cemented carbide
Kim, Chang-Ho ; Kang, Soo-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 1~6
The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the detection of a tool failure in turning process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. A preliminary stepped workpiece which had intentionally a hard condition was cut by the inserted cermet tool and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms. At tool failure, the approximation signals were suddenly increased and the detailed signals were extremely oscillated just before tool failure.
Analysis and Design of a Main Starting Valve Using Independence Axiom
Bae, Tae-Sung ; Park, Soo-Chul ; Park, Sang-Il ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 7~13
Main starting valve is one of the main parts in the control system of diesel engines, purposed for starting main engines. It is composed of ball valve, check valve, actuator, etc. The design axioms provide a general framework for design methodology. Two axioms are independence axiom and information axiom. These axioms can be applied to all design process in a general way. The first axiom is introduced to analyze and evaluate the design of a main starting valve. The design parameters(DPS) are determined sequentially by considering the independence axiom. For the structural design of a main starting valve, the strength is calculated by using finite element method. In addition, the strength of its actuator piston is evaluated.
Computational Study of Impingement Characteristics of Assist Gas from Coaxial/Off-axis Nozzles in Laser Machining
Yoon, Shi-Kyung ; Sung, Hong-Gye ; Lee, Yeol ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 14~19
A computational study was carried out to analyze the characteristics of supersonic (Mach 2.0) coaxial/off-axis jet's impingements on a slanted kerf surface in laser machining. The effects of various parameters such as gas pressure, distance between nozzle exit and kerf edge surface, and application of off-axis nozzles on the impingement phenomena of the assist-gas on kerf surface were observed. The present study showed that simply increasing the assist-gas pressure for coaxial supersonic nozzle was not effective to alleviate the strength of flow separation on kerf surface. It also presented the optimized operating condition of the coaxial nozzle to have the highest skin friction values over kerf surface.
A Comparative Study on the Improvement of the Performance of Swivel Valve Tube Couplers
Lee, Jun-Ho ; Sung, Jae-Kyeong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 20~27
In this study, we improved problems in the existing product by PARKER and developed the swivel valve tube couplers that can be produced by a low price in Korea. The major development was that a modulized production method was implemented by introducing a part assembling method that uses a cocking jig, and the production cost was reduced by operating the production process more simply than that of PARKER. Also, it was possible to avoid the patient registered by PARKER through the differences in the number of grooving processes and the type of o-ring. In the results of the rotation test by varying its application angle after installing it to a vehicle, it was verified that the structure proposed in this study can endure the eccentric torque and transformation pressure for various angles that have been considered as the problem in the existing fixed tube couplers. In addition, the structure was developed to adopt the problem that represents differences in the installation position of an air tank or the length and direction of hoses according to the type of vehicles produced in vehicle manufacturers. Furthermore, it was possible to verify that the product developed in this study was more excellent than that of PARKER through comparing the performance according to the Federal Motor Vehicle Safety Standard.
Influence of Injection Molding Conditions on the Birefringence of Disks
Lee, Ho-Sang ; Park, Min-Gyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 28~33
A computer code was developed to simulate all three stages of the injection molding process: filling, packing and cooling by finite element method. The constitutive equation used here was compressible Leonov model. The PVT relationship was assumed to follow the Tait equation. The flow-induced birefringence was related to the calculated flow stresses through the linear stress-optical law. Based on the simulation, the Taguchi method was used to investigate the influences of injection molding conditions on the birefringence of a center gate disk. In addition, the optimal processing conditions were selected to minimize the birefringence and the birefringence difference along the positions of the disk.
Characteristic Evaluation of Aluminium Filler Tube of Automotive
Kim, Hae-Ji ; Lee, Un-Ryeong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 34~39
The characteristic evaluation of an aluminium filler tube for automotive is presented in this paper. The material of filler tube was used AL3003 aluminium. In characteristic evaluation of an aluminium filler, we measured the corrosion, chemical resistance, weight, leak, welding strength, exciting endurance, and the solt spray test etc.. It has been shown that the weight decreased approximately 61% in aluminum filler tube developed comparing with steel filler tube. As the characteristic evaluation on the manufactured aluminium filler it was enough satisfied to use at the automotive filler tube.
Analysis of Tooth Surface Compressive Stress of Conical Involute Gear by Profile Modification
Kim, Jun-Seong ; Lee, Hyeon-Su ; Kim, Dong-Uk ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 40~49
Conical involute gears are being used for marine gearboxes, automotive transmissions, and robots, and so on, but not much. As involute profile gear, conical involute gear not only can be engaged with spur and helical gear but also can be used for power transmission of parallel, crossed and skewed axis with small angle. Hence, conical involute gears are likely to develop in future. Through a study on the basic theory of conical involute gear, tooth surface compressive stress analysis was performed by using commercial modeling program, comparing before and after profile modification. As a result, it noticed that tooth profile modification is able to relieve more tooth surface compressive stress than before modification.
A Study on the Efficient Meshfree Method Using Adaptive Refinement Analysis
Han, Kyu-Taek ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 50~56
Meshfree methods show many advantages over finite element method(FEM) in the class of problems for which the remeshing process is inevitable when the conventional FEM used, such as propagating crack problems, large deformation and so on. One of the promising applications of meshfree methods is the adaptive refinement for problems having multi-scale nature. In this study, an adaptive node generation procedure is proposed and several numerical examples are also presented to illustrate the efficiency of proposed method.
The Study on the System of Improving the Assembly Tolerance of Cellphone Camera Module
Ye, In-Soo ; Cheong, Seon-Hwan ; Choi, Seong-Dae ; Hyun, Dong-Hoon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 57~63
Tolerance analysis is one of the most important processes to improve the image quality of products. High resolution camera module for mobile phones needs precision assembly technology since the module becomes smaller and thinner. This paper will focus on the unit tolerance and the assembly tolerance which can affect the performance of the module. Lens shading and relative illumination were used to evaluate the optical axis scatter for each component on camera and estimate the assembly yield rate based on the evaluation result. A program was developed to analyze the impact on optical axis by each module, then to optimize the dimensions and tolerance for reducing the scatter of optical axis assembly. Through the simulation, though a rate of relative illumination was declined in where optical axis is displaced
from sensor center, MTF performance is not influenced by increasing in optical axis displacement. It was seen that assembly yield was improved in result of simulation after correcting optical axis tolerance.
Improvement of Manufacturing Process for Fuel Oil Supply Pipe using Large Vessel
Jeon, Eon-Chan ; Han, Min-Sik ; Kim, Nam-Hun ; Min, Jung-Oh ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 64~69
This study is the machining of fuel supply pipe used in large vessels. The fuel supply pipe of large vessels have effects to reduce engine exhaust because of common rail system and show excellent fuel efficiency so it is in the limelight as a vessel engine of next generation. At present, the shape of fuel supply pipe of common rail used for huge two-stroke & low-speed vessels is like a peanut hole so the second machining is necessary after the first machining. There is high error rate for machining and the materials waste caused by machining error is serious. Also, in this time the request for increasing the length of fuel supply pipe is suggested in the world market, it's judged that current methods will show higher error rate for machining. Therefore, the purpose of this study is to improve the machining process used originally. For that, the system controlling the process was developed as well as surface roughness and straightness which are evaluation items of fuel supply pipe were measured so that improved process can be observed in real time.
Development of Nd-Yag Laser Marking System for Cylinderical Parts
Lee, Se-Han ; Kang, Jae-Gwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 70~75
In this paper, laser marking systems dedicated to cylinderical parts was developed. We first develop the marking device which consists of Nd-Yag laser, galvano scanner and additional rotational axis, then develop algorithm for supporting the digital image with bmp data format. Additional rotational axis is so attached as to rotate the cylinderical parts for marking its whole surface. The image is separated into line by line and the separated line image is sent to galvano scanner while rotating the additional axis simultaneously. CxImage library, famous open source code, is employed for the image processing. The developed method was tested with various images and shows that it reduces marking time significantly without reducing marking quality.
A Shock-Proof Evaluation of a Naval Vessel Motor using DDAM and Transient Response Analysis
Lee, Seong-Wook ; Kim, Jin ; Kong, Yeong-Kyung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 76~82
In this study, we carried out to evaluate the shock-proof of a large scale motor for the naval vessel using dynamic design analysis method (DDAM) and full transient dynamic analysis. Analytical models for main assemblies (motor frame, rotor and stator assembly) were consisted of the tetrahedral solid elements and the equipments which installed in the upper side of the motor were substituted the mass elements. And we also modelled resilient mounts of a motor using the beam elements with appropriate directional stiffness. The DDAM was conducted according to NRL memorandum report 1396 and the full transient dynamic analysis was performed applying directional triple half triangle shock wave to the motor using ANSYS 12. As a result, we could compare of the results according to each analytic method and find the motor to satisfy the design criteria of the maximum stress and deformation.
Analysis of the Reduction of the Dynamic Response for the CNC 5 Axles Machining Center
Kim, Gi-Man ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 83~89
In this paper, the dynamic response of a CNC 5 Axles machining center was analyzed and then controlled passively by using the dynamic absorber. For the simplification of the theoretical approach, the CNC 5 Axles machining center was modeled as a flexible beam(Bed) having a point mass(Column), two discrete systems(a Table-set and a dynamic absorber). Specifically by using the dynamic absorber, the dynamic response of a Table-set which be caused by the vibration of a flexible beam, was reduced down to the infinitesimal level. The optimal design factors of the dynamic absorber were obtained from the minimization of the cost function. It was found that the natural frequencies of a UT-380 machining center be varied due to the movement of the Table-set. In view of the dynamic response of a Table-set, the larger spring stiffness and mass of the dynamic absorber were found to give the greater reduction.
Dynamic Instability of Elastically Restrained Valve-pipe System
Son, In-Soo ; Hur, Kwan-Do ; Gal, Young-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 9, issue 5, 2010, Pages 90~95
The dynamic instability and natural frequency of elastically restrained pipe conveying fluid with the attached mass are investigated in this paper. Based on the Euler-Bernoulli beam theory, the equation of motion is derived by using extended Hamilton's Principle. The influence of attached mass and its position on the dynamic instability of a elastically restrained pipe system is presented. Also, the critical flow velocity for the flutter and divergence due to the variation in the position and stiffness of supported spring is studied. Finally, the critical flow velocities and stability maps of the pipe conveying fluid with the attached mass are obtained by changing the parameters.