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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
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Journal DOI :
The Korean Society of Manufacturing Process Engineers
Editor in Chief :
Volume & Issues
Volume 13, Issue 6 - Dec 2014
Volume 13, Issue 5 - Oct 2014
Volume 13, Issue 4 - Aug 2014
Volume 13, Issue 3 - Jun 2014
Volume 13, Issue 2 - Apr 2014
Volume 13, Issue 1 - Feb 2014
Selecting the target year
The Development of Module for 5-axis Drilling of a Closed Type Impeller
Son, Hwang-Jin ; Cho, Yoon-Tea ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 1~7
DOI : 10.14775/ksmpe.2014.13.1.001
An impeller is difficult to machine due to the complex, overlapping and twisted shapes that form the blades of an impeller. Therefore, most CAM software companies have developed a CAM module for manufacturing an impeller in addition to their CAM software. However, it is not easy for inexperienced users to machine impellers. The purpose of this paper is to outline the development of an automatic CAM module for the manufacturing of an impeller (E-ICAM) which is based on visual basic language and which uses a CATIA graphical environment in order to simplify the machining of impellers. The automatic CAM module generates a tool path and proposes the recommended cutting condition according to the stock and tool material. In addition, it includes a post-processor for five-axis control machining. Therefore, a user can easily machine impellers using this automation module. There are two types of impellers: the closed and open types. The closed-type impeller consists of the body and cover parts. To combine these two parts, it is necessary to create tap holes on the shroud of the body. Therefore, in the study, a drilling CAM program for a closed-type impeller is developed and manufactured by creating NC data from the developed drilling program. After manufacturing the test specimen, its compatibility was verified.
Vibration Analysis at Bike Frame Fork
Cho, Jae Ung ; Han, Moon Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 8~15
DOI : 10.14775/ksmpe.2014.13.1.008
This study investigates structural and vibration analyses for three types of bike frame fork models. As long as the maximum equivalent stresses of these models are lower than the yield stress, the three models are considered to be safe structurally. Type 3, with a maximum equivalent stress of 169.23 MPa, has the lowest stress among the three models and the strongest strength. Types 1, 2 and 3 have natural frequencies lower than 270 Hz. Type 3, with a critical frequency of 118 Hz, has the best durability under vibration among the three models. In order to decrease the vibration transmitted to a bike rider riding on a rough road, the impact due to vibration can be relieved by selecting a Type 3 model from among the three models. The results of this study can be effectively utilized for the design of a bike frame fork as this allows the anticipation and prevention of damage caused by durability issues.
A Study on the Uncertainty of Estimation in Vibration Test for the Machine Parts
Hwang, Jae-Deok ; Kim, Chae-Sil ; Cho, Sung-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 16~22
DOI : 10.14775/ksmpe.2014.13.1.016
Resonance refers to the magnification of a structural response which occurs when a linear lightly damped system is driven with a sinusoidal input at its natural frequency. An exploratory vibration test (a natural frequency measurement test) is very important for the vibration testing of machine parts, as the value measured in an actual laboratory affects test results. For this reason, it is necessary to estimate the measurement uncertainty to verify the reliability of this type of test. In this study, measurement uncertainty is estimated based on three uncertainty factors. The uncertain factors are the measured points in the machine parts, the resolution of the vibration equipment, and uncertainty of the calibration certificate.
Analytical Structural Integrity for Welding Part at Piping Penetration under Seismic Loads
Choi, Heon-Oh ; Jung, Hoon-Hyung ; Kim, Chae-Sil ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 23~29
DOI : 10.14775/ksmpe.2014.13.1.023
The purpose of this paper is to assess the structural integrity of piping penetrations for nuclear power plants. A piping qualification analysis describes loads due to deadweight, pressure difference acts normal to the plate, thermal transients, and earthquakes, among other events, on piping penetrations that have been modeled as an anchor. Amodel was analyzed using a commercial finite element program. Apiping penetration analysis model was constructed with an assembly of pipe, head fittings and sleeves. Normally, the design load, thus obtained, will consist of three moments and three forces, referred to a Cartesian coordinate system. When comparing the stress analysis results from each required cutting position, the general membrane stress intensities and local membrane plus bending stress intensities during a structural evaluation cannot exceed the allowable amount of stress for the design loads. Therefore, the piping penetration design satisfies the code requirements.
Using the obstacle position information of the mobile robot in the two-dimensional cartography Study
Lee, Jun-Ho ; Hong, Hyun-Ju ; Kang, Seog-Joo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 30~38
DOI : 10.14775/ksmpe.2014.13.1.030
The purpose of this study is to build and manage environment models with line segments from sonar range data on obstacles in unknown and varied environments. The proposed method therefore employs a two-stage data-transform process in order to extract environmental line segments from range data on obstacles. In the first stage, the occupancy grid extracted from the range data is accumulated to form a two-dimensional local histogram grid. In the second stage, a line histogram extracted from a local histogram grid is based on a Hough transform, and matching serves as a means of comparing each of the segments on a global line segments map against the line segments to detect the degree of similarity in the overlap, orientation, and arrangement. Each of these tests is formulated by comparing one of the parameters in the segment representation. After the tests, new line segments can be found at maximum-density cells in the line histogram, and they are composed onto the global line segment map. The proposed technique is demonstrated in experiments in an indoor environment.
A Study on the Static/Dynamic Stability for the Structure of a Mill Turret with a B-Axis Tilting Facility
Kang, Seung-Hee ; Kim, Chae-Sil ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 39~44
DOI : 10.14775/ksmpe.2014.13.1.039
Techniques of tool posts are developing such that variable machining is possible using only one machine for the complication of a product's shape and to reduce the machining time. In order to develop a mill turret with a variable machining function with the mounting of mill turret units on a B-axis tilting table, we determine the static/dynamic stability of the structure of the mill turret. To this end, a static structural analysis and a modal analysis were conducted. From the results of the static structural analysis, the maximum stress was found to be less than the allowable stress. By the comparing the results of the modal analysis of the excitation frequencies of the mill turret, there were no resonance regions found. Therefore, the mill turret with the B-axis tilting facility is shown to have good structural integrity.
A Study on 3D Modeling & Stress Analysis of Helical Conical Involute Gear
Kang, Jai-Hwa ; Lee, Do-Young ; Kim, Jun-Sung ; Xu, Zhe-Zhu ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 45~51
DOI : 10.14775/ksmpe.2014.13.1.045
Generally, marine transmissions contain straight shafts and helical gears, meaning that enginerooms require more space. In order to guarantee a levelengine space for conical involute gears or beveloid gears, both of which are important machine parts, a conical gear was used to replace the traditional cylinder gear. Owing to weak points such as the point contact phenomenon of the teeth, a limitation of the width of each tooth in terms of the addendum, the variational modification coefficient,and the difficulty of processing, research about conical involute gears remains at a standstill. Along with the increasing number of applications of conical involute gears, research on conical gear design technology is necessary. In this paper, in an effort to enhance conical gear design technology, research on the 3D modeling and stress analyses of helical conical involute gears were done.
Domestic Development of Vibrational Film Forming Machine and Die in the High Speed Production(II) - Multi-production forming machine -
Kim, Jungl-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 52~58
DOI : 10.14775/ksmpe.2014.13.1.052
This study consists of two parts. The first discusses the development of a single production forming machine which was reported in earlier papers. The second outlines the development of a multi-production forming machine, which consists primarily of a film feeding unit, an unwinding unit, and a heating block unit. The heating block unit of the multi-production forming machine has 30 members per die. An analysis of the stress deformation and temperature deviation of this machine is carried out using ANSYS Workbench and CFX-11 under the design conditions. According to this analysis, the maximum deflection in the Z-direction is
and the maximum temperature deviation is
when the temperature of the heating block unit is
. It was also found that these values are structurally safe. The advantage of the developed multi-production forming machine is demonstrated to be in its offering of a proper voice test.
Characteristics of Pulse Width Modulation(PWM) Excitation of Ultrasonic Elliptical Vibration Cutting Device
Loh, Byoung Gook ; Kim, Gi Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 59~65
DOI : 10.14775/ksmpe.2014.13.1.059
To obtain an elliptical trajectory at the cutting edge during elliptical vibration cutting, sinusoidal voltage excitations of two piezoelectric actuators have commonly been used. In this study, PWM excitation, which is relatively simple to generate, was employed and its characteristics were investigated. In experimental and analytical analyses, we found that for PWM excitation, the integer-multiple frequencies of the excitation voltage distorted the shape of the elliptical trajectory, whereas at a duty ratio(DR) of 50%, the distortion of the elliptical trajectory was minimized due to disappearance of the first overtone. When the magnitude of the maximum excitation voltage was maintained at the same level for both PWM and sinusoidal excitation, PWM (DR=50%) excitation produced a greater vibration amplitude than sinusoidal excitation but resulted in more rapid saturation of a high-frequency power amplifier.
Development of a Material Test Machine Using an Electro-Magnetic Actuator
Lee, Se-Han ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 66~71
DOI : 10.14775/ksmpe.2014.13.1.066
In this research, a material test machine is developed which uses a small electro-magnetic actuator and a leverage mechanism. The leverage mechanism amplifies the force from the electro-magnetic actuator. The electro-magnetic part operates more silently and cleanly than a hydraulic part. In a tooth material study, a test machine does not require a large force capacity because it handles only
-sectioned and short-span specimens. Conventional test machines such as those by Instron and the BOSE Enduratec ELF3200 have too high aforce capacity for a tooth material study. A test machine for a tooth material study requires an acting force only on the order of tens of Newtons (N) operating at several Hertz.
A Study on the Grinding Characteristics of Surgical Implant Zirconia
Lee, Sang-Min ; Chae, Seung-Su ; Lee, Choong-Seok ; Kim, Tack-Su ; Lee, Jae-Kun ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 72~77
DOI : 10.14775/ksmpe.2014.13.1.072
3.2YSZ melted by the 'skull melting' method has good physical properties and does not undergo low-temperature degradation. Due to its excellent physical and mechanical properties, skull-melted 3.2YSZ has been developed as a dental implant material. In this study, a porous, resin-bonded diamond wheel was created and its grinding characteristics were compared with those of traditional nonporous wheels using skull-melted 3.2YSZ. The experimental results indicate that the porous, resin-bonded diamond wheel requires less grinding force and power. In addition, the porous, resin-bonded diamond wheel requires a greater degree of roughness.
A study on the Error Separation Method in Rotation Accuracy Measurement of High Precision Spindle Unit
Kim, Sang-Hwa ; Kim, Byung-Ha ; Jin, Yong-Gyoo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 78~84
DOI : 10.14775/ksmpe.2014.13.1.078
The rotation of a spindle unit must be accurate for high-quality machining and to improve the quality of the machine tools.Therefore, the proper measurement of the rotation accuracy and ensuring a proper analysis are very important. Separate processes are necessary because spindle errors and roundness errors associated with the test balls can both factor into the measured rotation error values. We used three methods to discern test ball errors and analyzed which could be deemed as the most proper technique in a test of the rotation accuracy of the main spindle of a machine tool.
A Study on Tooth Micro-geometry Optimization of Planetary Gear for 5MW Wind Turbine Pitch Drive
Lee, In-Bum ; Kim, Dong-Young ; Xu, Zhe-Zhu ; Lee, Do-Young ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 85~91
DOI : 10.14775/ksmpe.2014.13.1.085
The rotation of a spindle unit must be accurate for high-quality machining and to improve the quality of the machine tools. Therefore, the proper measurement of the rotation accuracy and ensuring a proper analysis are very important. Separate processes are necessary because spindle errors and roundness errors associated with the test balls can both factor into the measured rotation error values. We used three methods to discern test ball errors and analyzed which could be deemed as the most proper technique in a test of the rotation accuracy of the main spindle of a machine tool.
Development of the Aspherical Lens Polishing System with MR Fluid and Analysis of the Basic Polishing Characteristic of MR Polishing System
Lee, Jung-Won ; Cho, Myeong-Woo ; Ha, Seok-Jae ; Hong, Kwang-Pyo ; Cho, Yong-Kyu ; Kim, Byung-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 92~99
DOI : 10.14775/ksmpe.2014.13.1.092
An aspherical lens, which resolves several problems with a spherical lens,typically serves asa key part of an optical system. Generally, an aspherical lens is fabricated using a diamond turning machine or by mean of injection molding. However, residual stress and/or tool marks can arise when using a commercial fabricating method such as DTM or injection molding. A polishing process, thus, is commonly used to obtain a high-precision aspherical lens. In this study, a polishing method using MR fluid was applied to minimize several problems, in this case residual stress and the creation of tool marks, during the cutting process. The MR polishing system was developed to polish aspherical lenses. A series of experiments were performed to obtain a very fine surface roughness. PMMA (the lens material for molding) was used as a workpiece, and the gap size, magnetic field intensity, wheel speed and feed rate were selected as the parameters in this study. Finally, a very fine surface roughness of Ra=2.12nm was obtained after MR polishing.
Characteristic study of mechanical properties of Structural rolled steel and Stainless steel for MIG welding
Lim, J.Y. ; Yoon, M.J. ; Kim, S.Y. ; Kim, T.G. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 100~106
DOI : 10.14775/ksmpe.2014.13.1.100
It is well known that fatigue failures occur on welded structures in industrial application due to repetitive load force. In order to decrease the incidence of fatigue failure, we analyzed the mechanical properties based on structural aspects in rolled steel(SS 400) welded onto stainless steel (STS 304) by the MIG welding method as well as the structure of rolled steel welded onto itself. We compared the hardness, tensile and fatigue properties with two types of samples which had no defects on the welding parts as observed by X-ray topographic analysis. It was found that the tensile and fatigue strength levels of SS 400 welded onto STS 304 by the MIG welding method were higher than those of STS 304 welded onto itself.
A Study on the Development of Friction Hinge with Automatic Closed Function
Ye, Sang-Don ; Min, Byeong-Hyeon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 107~114
DOI : 10.14775/ksmpe.2014.13.1.107
A friction hinge system which moves without power was designed and developed using the principle of friction force, which is caused by interference between the inner diameter of a silicon cap and the outer diameter of a cylindrical roller bearing with one-way rotation in a counterclockwise direction. The system was applied to the lid of buffet ware, which moved up by external force and moved down by gravitational force. However, design conditions which included a rotation angle of the hinge of more than 80 degrees and a closing time of more than 20 seconds were required when the lid of the buffet ware closed due to gravitational force. The design safety of the friction hinge body connected to the lid of the buffet ware from the hinge system was checked on the basis of structural, fatigue and thermal analyses. The material of the shaft, cap and flange among the hinge elements was changed to polyethylene from steel to reduce the weight of the friction hinge system. An injection molding simulation was performed and injection molds of the shaft, cap and flange were created. The weight of the hinge system was decreased from 805g to 219g.
A Study on Components Load of 5MW Wind Turbine Pitch Drive
Kim, Dong-Young ; Lee, In-Bum ; Liang, Long-Jun ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 115~120
DOI : 10.14775/ksmpe.2014.13.1.115
Wind power is a type of clean energy source which does not produce carbon dioxide. The wind turbine industry is considered as a major growth industry in many countries. The main cause of wind turbine failure arises in the wind turbine gearbox, and the main type of damage occurs in the bearings and gears. Therefore, predictions of gear and bearing damage are very important to ensure the reliability of the wind turbine reducers used in these systems. In this research, in order to optimize the wind turbine reducer, a series of simulations and redesigns was done using the tool RomaxDesigner. The RomaxDesigner model was used to analyze the bearing life of the duty cycle for a 5 MW wind-turbine pitch drive and to calculate the load in operating states. The reducer was designed to satisfy the life requirement by analyzing bearing damage and calculating the stress values of the main parts of the reducer.
A Experimental Study on Efficient Applicable Combination of Super Finishing Films for Mirror Surface Machining
Cho, Kang-Su ; Kim, Sang-Kyu ; Cho, Young-Tae ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 13, issue 1, 2014, Pages 121~128
DOI : 10.14775/ksmpe.2014.13.1.121
Superfinishing is essential for mirror surfaces, because among mechanical components cylindrical workpieces such as spindles must maintain precision and reliability with respect to functional characteristics. However, research on standardization of polishing film application combination to obtain mirror surfaces is insufficient. Consequently, this has been a factor in rising costs of mechanical components. Therefore, in this study, experiments have been conducted to determine efficient polishing film application combination for mirror surfaces ranging from ductile materials such as SM45C, brass, aluminium 7075, and titanium to brittle materials such as
. From the experimental results, efficient polishing film application combination for metallic materials and ceramic materials is confirmed.