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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
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Volume & Issues
Volume 10, Issue 6 - Dec 2011
Volume 10, Issue 5 - Oct 2011
Volume 10, Issue 4 - Aug 2011
Volume 10, Issue 3 - Jun 2011
Volume 10, Issue 2 - Apr 2011
Volume 10, Issue 1 - Feb 2011
Selecting the target year
Analysis of 3D Volumetric Error for Machine Tool using Ball Bar
Lee, Ho-Young ; Choi, Hyun-Jin ; Son, Jae-Hwan ; Lee, Dal-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 1~6
Machine tool errors have to be characterized and predicted to improve machine tool accuracy. Therefore, it is very important to assess errors in machine tools. Volumetric error analysis has been developed by many researchers. This paper presents a useful technique for analyzing the volumetric errors in machine tools using the ball bar. The volumetric error model is proposed in specific vertical machining center and the program is developed for generating NC code, acquiring the ball bar data, and analyzing the volumetric errors. The developed system assesses the volumetric errors such as positional, straightness, squareness, and back lash. Also this system analyzes the dynamic performance such as servo gain mismatch. The radial data acquired by ball bar on 3D space is used for analyzing these errors. It is convenient to test the volumetric errors on 3D space because all errors are calculated at once. The developed system has been tested using an actual vertical machining center.
Study on Structure Design of High-Stiffness for 5 - Axis Machining Center
Hong, Jong-Pil ; Gong, Byeong-Chae ; Choi, Sung-Dae ; Choi, Hyun-Jin ; Lee, Dal-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 7~12
This study covers the optimum design of the 5-axis machine tool. In addition, the intelligent control secures structural stability through the optimum design of the structure of the 5-axis machine center, main spindle, and the tilting index table. The big requirement, like above, ultimately leads to speed-up operation. And this is inevitable to understand the vibration phenomenon and its related mechanical phenomenon in terms of productivity and its accuracy. In general, the productivity is correlated with the operation speed and it has become bigger by its vibration scale and the operation speed so far. Vibration phenomenon and its heat-transformation of the machine is naturally occurred during the operation. If these entire machinery phenomenons are interpreted through the constructive understanding and the interpretation of the naturally produced vibration and heat-transformation, it would be very useful to improve the rapidity and its stability of the machine operation indeed. In this dissertation, the problems of structure through heating, stability, dynamic aspect and safety about intelligent 5-wheel machine tool are discovered to examine. All these discoveries are applied to the structure in order to enhance the density of it. It aims to improve the stability.
Design of High Speed Spindles Active Monitoring and Control Algorithm
Choi, Hyun-Jin ; Park, Chul-Woo ; Bae, Jung-Sub ; Ahn, Jeong-Hun ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 13~19
In this paper, the active monitoring and control system is developed. This system can monitor the status of high the speed spindle in real time during its processing, and can analyze its influence of dimensional accuracy and processing if any, and can control the machining condition to realize the machining system equipped with active monitoring and self-diagnostic features. Machining experiment was performed on 3 materials Al, Brass and S45C in order to derive the relation between active monitoring and control algorithm by the machining load. In addition, we measured surface roughness of processing specimen along with the data change of spindle rotating speed and conveying speed according to variation of machining load. Based on these experiments, we derived relations for each material that can be applied to the control algorithm to allow self control of the rotating speed and conveying speed according to the machining load.
Design of High Speed Spindle for 5-Axis Machining Equipment Equipped with Piezo-Electric Load Sensoring
Choi, Hyun-Jin ; Park, Chul-Woo ; Jang, Eun-Sil ; Kim, Chung-Hyun ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 20~25
In this paper, we reviewed the spindle system's motor and bearing and its mode safety for optimal design of a high speed spindle system that exceeds DmN value of 1,500,000. We could verify that it has a separation margin during critical speed by performing critical speed analysis. Also, we have selected an optimal sensoring installation location and actually manufactured & installed the sensor by identifying the stress concentration position in the axial load through finite element analysis to install the built-in piezo electric type load sensor to the spindle housing that can measure and monitor the machining load during high speed rotation of the spindle. Reproducibility is also verified by calibrating the error through the sensor's sensitivity adjustment after comparing the output between the plate dynamoneters and the load sensor to confirm the reproducibility of the load sensor.
A Study on the Laser Measurement Experiment for Performance Advancement of Tilting Index Table
Kim, Kwang-Sun ; Lee, Tae-Ho ; Lee, Choon-Man ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 26~30
Currently, many researches are carried out about tilting index table, which is one of the main component of 5-axis machine tool. The performance of the tilting index table is associated the rotational accuracy which is very important factor for high precision machining because it have an effect on machining error. In this paper, a tilting index table is developed, and the rotational accuracy of the tilting index table using a laser measurement equipment is measured. In addition, a correction value is obtained from the measured value through compensation, and the correction value is used to improve the accuracy of the table. Comparative analysis is carried out for the accuracy of the table before and after compensation. This paper can be used by a reference for performance and reliability advancement of tilting index table.
Thermal Characteristics Analysis of High Speed Spindle of CA Frame Equipment for Eyewear
Choi, Hyun-Jin ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 31~37
For the domestic glasses industry to procure competitiveness in the world CA(Cellulose Acetate) frame of spectacles market, CNC machining system for CA frame including high-value added CA cutting technologies should be developed with new materials for the rim based on Cellulose and sheet manufacturing base. The spindle system of glasses frame equipment that is the core to the quality of CA frame is the key technologies to realize high-speed, high-precision so its importance is remarkably emerging. In the study, at the structural design of the high spindle system of the private equipment for CA glasses frame embedded a motor of 40,000rpm, the stability of design was analyzed and investigated through selecting lubrication structure and thermal characteristics of the spindle system.
Development of Electrical and Oil Heater for Energy Saving
Chung, Sung-Won ; Kim, Dong-Keon ; Gong, Sang-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 38~43
This study was carried out to evaluate the structural stability of hybrid type fan heater. The evaluation of structural safety of hybrid fan heater was conducted by using Ansys Workbench and CFX-11 under the design condition. The hybrid fan heater was operated by heat transfer for heat source supplied from electric heater and combustion gas. According to result of structural analysis, the maximum equivalent stress of hybrid fan heater was 150MPa when the temperature of heat transfer fluids was
. It was found that the hybrid fan was structurally safe because the value of maximum equivalent stress was smaller than that of yield stress of the material.
Effect of Deposition Time on the Properties of TiN-coated Layer of SM45C Steel by Arc Ion Plating
Kim, Hae-Ji ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 44~50
The effect of deposition time in arc ion plating on surface properties of the TiN-coated SM45C steel is presented in this paper. The surface roughness, micro-particle, micro-hardness, coated thickness, atomic distribution of TiN, and adhesion strength are measured for various deposition times. It has been shown that the deposition time has a considerable effect on the micro-hardness, the coated thickness, and the atomic distribution of TiN of the SM45C steels but that it has little influence on the surface roughness and adhesion strength.
A Study on Design of Underactuated Robot Hand driven by Shape Memory Alloy
Kim, Gwang-Ho ; Shin, Sang-Ho ; Jeong, Sang-Hwa ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 51~57
The lightweight and compact actuator with high power is required to perform motion with multiple degrees of freedom. To reduce the size and inertia of a robot manipulator, the mechanical transmission system is used. The shape memory alloy(SMA) is similar to the muscle-tendon-bone network of a human hand. However, there are some drawback and nonlinearity, such as the hysteresis and the stress dependence. In this paper, the design of the underactuated robot hand is studied. The 3-finger dexterous hand is driven by the SMA actuator using segmental mechanism. This digital approach enables to overcome the nonlinearity of SMA wire. The translational displacement of SMA actuator required to bend a phalanx of the underactuated robot hand is estimated and the bending angle of the underactuated robot hand according to input displacement of SMA actuator is predicted by the multi-body dynamic analysis.
A Study on the Forming Process of Honeycomb Core by Finite Element Analysis
Han, Kyu-Taek ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 58~64
In this paper, research on the manufacturing technology of hexagonal structure core is investigated. Also the optimal forming process of the honeycomb core is developed and the rolling process is analyzed using finite element code,
-3D. The standard honeycomb has a uniform hexagonal structure defined by the material, cell size, cell wall thickness and bulk density. Honeycomb core products can be made from any thin, flat material. The most common cell configuration is the hexagon but there are many other shapes for special applications. Because of the precision shape and the thin thickness, the honeycomb core is not easy to manufacture in the metal forming process. Through this study it was confirmed that after the rolling process, the section of honeycomb close to the standard shape can be obtained. This result is reflected to the manufacturing process design for the honeycomb core.
Study on Structural Analysis of Front Axle
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 65~71
This study analyzes about front axle through the analyses of stress, fatigue and vibration. Maximum equivalent stress is shown with the frequency of 60Hz in case of the harmonic vibration analysis applied with force. Among the cases of nonuniform fatigue loads, 'SAE bracket history' with the severest change of load becomes most unstable but 'Sample history' becomes most stable. In case of 'Sample history' with the average stress of 0 to
MPa and the amplitude stress of 0 to
MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 6 times more than the damage possibility of 'SAE Bracket history' or 'SAE transmission'. The structural result of this study can be effectively utilized with the design of front axle by investigating prevention and durability against its damage.
The Study for Development of Damper Case Production Technique using Incremental Forming
Park, Jeong-Ho ; Lee, Tae-Won ; Jeong, Young-Duk ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 72~78
Currently, for the damper case, the material produced by cast/forge welding is mechanically processed and then the final product is mass-produced. By cutting the cast/forge welded material, the issues of excessive cutting time, multiple process production, and a large amount of chips (40% loss from the original material) arise, causing increased production cost and reduced profitability. Thus, in this study, the incremental forming technology which generates no chips was applied in production. Analysis was excuted for 1st and 2nd works by change of tool diameter and working tool. For this, 3D molding and analysis were executed, which was applied to the processing the result, successful processing could be achieved through a few trials of molding processing according to tool forming and rotation counts.
A Study on NOx Reduction for a Small Marine Diesel Engine
Sim, Han-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 79~84
Air pollutants from a small marine diesel engine are increasing and the IMO(International Marine Organization) regulation asked for its reduction. In this study, NOx reduction technologies such as improvement of various cooling systems are applied to the small marine diesel engine. The various cooling systems are a intercooler, a heat exchanger for engine coolant, and an exhaust manifold by water cooling. These systems are tested on an engine dynamometer and a exhaust gas analyzer by a marine diesel engine test regulation. Test results are shows that the small marine engine are satisfied the IMO NOx regulations; Tire II.
Optimizations of Air-trap Locations in the Speaker Encloser of Mobile Phone by Injection Molding Simulations
Park, Ki-Yoon ; Park, Jong-Cheon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 85~90
In this paper a design procedure via computer-aided molding simulation is presented to optimize the air-trap locations in a speaker encloser of mobile phone. The molding flow simulation reveals that the race-tracking phenomenon is the dominant feature in the current mold design. In obtaining an optimal filling pattern, the local modifications of the wall thickness such as in a flow leader attachment are considered as the primary control factor, and both the gate position and the filling time become the secondary control factor. In the one-at-a-time approach, the last location to be filled in the mold cavity could be successfully moved to the extremities of the part, allowing a natural ventilation of entrapped air through the mold parting plane.
Flow Characteristics due to Cutoff angle of Turbo-Fan for Industries
Yun, Ji-Hun ; Jeong, In-Guk ; Yi, Chung-Seob ; Suh, Jeong-Se ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 91~96
This study aims to analyze the flow characteristics of turbo-fan which is applied to the industrial field. Numerical analysis has been carried out to investigate the pulsation behavior of exhaust air flown out turbo fan by rotating impeller with constant speed. Moving mesh technique is proved as time-accurate solution for the flow inside impeller. As numerical results come within the error range of 1% by comparing with theoretical results, the numerical analysis can be verified. Cutoff angle has large influence on the amplitude of pulsation and the least pulsation of flow can be generated by the cutoff angle of
A Numerical Analysis on Flow Characteristic in a Standard Cyclone Dust Separator
Lee, Chi-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 97~103
This study is numerical analysis on flow characteristic in a standard cyclone dust separator. The cyclone dust separator is widely used in a industrial applications as a method for dust removed from gases. In cyclone chamber, a very complex flow field is formed, involving the interaction between highly swirling velocity and turbulent field. Numerical analysis with computational fluid dynamics(CFD) was carried out to investigate the working fluid that flow into cyclone dust separator. Helical entry type was increasing flow rate compared with tangent entry type. And according to increasing pressure difference was increased fan power. But, helical entry type was high performance dust separator, in comparison with tangent entry type.
Study for Local Glass Transition of Bulk Metallic Glasses using Atomic Strain
Park, Jun-Young ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 104~109
Bulk metallic glasses (BMG) have been greatly improved by the advance of synthesis process during last three decades. It was also found that the Glass Forming Ability (GFA) strongly depends on the glass transition temperature. When the temperature approaches to a critical value, the crystals nucleation from the supercooled liquid can be suppressed so that bulk glass formation possible. Egami and others found that the local glass transition temperature depends on the volumetric strain of each atom and suggested the critical transition temperature. In this paper, we explore the strain dependency of local glass transition temperature using the atomic strain defined by the deformation tensor for the Voronoi polyhedra.
The Study on the Characteristics of Groove Wandering and Noise Caused by the Design Parameter of Longitudinal Groove on the Tire's Pattern
Han, Jin-Hyuk ; Hwang, Sung-Wook ; Kang, Yong-Gu ; Han, Min-Hyeon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 110~116
Water on a road surface can lower the coefficient of friction of vehicle tires and it involves lots of risks. One way to prevent water from staying is to cut many "rain grooves" into the edges of the pavement parallel. Such grooves, however, can exert unwanted side forces, particularly on passenger tires, which cause "Groove Wander" making the drivers uncomfortable. The "Groove Wander" is somewhat related to vehicle geometry, but is more strongly related to interaction between road grooves and tire tread's longitudinal grooves. This thesis tries to examine principles to estimate "Groove Wandering" effect focusing on the design of longitudinal groove. Additionally, it studied how to reduce pipe resonance longitudinal grooves form in the contact patch.
A Study on the Comparison of Approximation Models for Multi-Objective Design Optimization of a Tire
Song, Byoung-Cheol ; Kim, Seong-Rae ; Kang, Yong-Gu ; Han, Min-Hyeon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 117~124
Tire's performance plays important roles in improving vehicle's performances. Tire makers carry out a lot of research to improve tire's performance. They are making effort to meet multi purposes using various optimization methods. Recently, the tire makers perform the shape optimization using approximation models, which are surrogate models obtained by statistical method. Generally, the reason why we increase sampling points during optimization process, is to get more reliable approximation models, but the more we adopt sampling points, the more we need time to test. So it is important to select approximation model and proper number of sampling points to balance between reliability and time consuming. In this research, we studied to compare two kind cases for a approximation construction. First, we compare RSM and Kriging which are Curve Fitting Method and Interpolation Method, respectively. Second, we construct approximation models using three different number of sampling points. And then, we recommend proper approximation model and orthogonal array adopt tire's design optimization.
Evaluation on Characteristics of Unsteady Combustion and Combustion Oscillation
Yang, Young-Joon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 125~130
The characteristics of unsteady combustion were experimentally investigated using confined premixed flames stabilized by a rearward-facing step. The unsteady combustion used in this experiment plays an important role in controlling self-excited combustion oscillations and it has usually desirable performance such as high load combustion and low pollutant emission. It is known that combustion oscillation is occurred if Rayleigh's criterion is satisfied. The pressure fluctuation and OH-emission fluctuation were measured using pressure transducer and OH optical fiber respectively and then cross-corelation and phase difference were calculated to apply Rayleigh's criterion.
Improvement of Mechanical Properties of IPMC through Developing a Degree of Dispersion of SWCNT/Nafion Composite
Kwon, Hui-June ; Kim, Ha-Na ; Kang, Jung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 10, issue 5, 2011, Pages 131~136
Many researchers are recently studying about Electroactive polymer(EAP). But it has a physical limitation, because of property of material. Carbon nanotube(CNT) is known as the promising material which has excellent electro-mechanical characteristics and is mostly defect-free. It is expected that a successful synthesis of CNT and Nafion known as a primary material for IPMC would make a great improvement on its electro-mechanic feature. This study focuses on the method of synthesis of CNT with Nafion which improves electro-mechanical characteristic. To come up with mechanical dispersion with Nafion and Isopropyl Alcohol(IPA), we dispersed Single-walled carbon nanotubes(SWCNTs). For a uniformly layer of CNT, we used a spray gun on a hot plate by a simplified method. We fabricated a disperse SWCNT/Nafion composite uniformly. Through the use of the E-beam evaporator to form an uniform electrode layer, we consummated the IPMC actuator. This result shows improving 1.5 times mechanical properties about driving force in IPMC.