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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 8, Issue 4 - Dec 2009
Volume 8, Issue 3 - Sep 2009
Volume 8, Issue 2 - Jun 2009
Volume 8, Issue 1 - Mar 2009
Selecting the target year
A Foundation Study on the Selection of Bearing Lubrication Conditions in High-speed Spindle
Ahn, Sung-Hwan ; Lee, Choon-Man ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 3~9
Recently, a high speed cutting is essential requirement to satisfy latest demand of high precision product and machining of hard materials. However heat generation by high speed rotation causes many problems. The machining error and shortening spindle lifetime by thermal stress is typical example. Generation of heat is mostly caused by sliding at the rotor and bearing. For minimization of heat generation at bearing, decision of the condition of proper lubrication is necessary. The thermal study about 40,000rpm spindle by changing the condition of oil-air lubrication method is carried out in this paper. The results of this paper can be used effectively in the decision of oil-air lubrication condition of other types of spindle for machine tools.
Selection of Bearing Position for Improving Static and Dynamic Stiffness of 40,000rpm High-speed Spindle
Lim, Jeong-Suk ; Chung, Won-Jee ; Lee, Choon-Man ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 10~17
Spindle design is very important for the improvement of the competitive power in production cost of high quality machine tools. The important factor in spindle design is not only to improve the natural frequency of spindle but also to reduce displacement of spindle end. In this paper, parameters those influence on static and dynamic stiffness of high-speed spindle have selected form preceding studies. And those selected parameters are applied to Taguchi Method. To perform FEM analysis, bearing conditions are selected with optimized condition. To know how to improve static and dynamic stiffness of machine tool spindle, natural frequency and displacement of spindle end are obtained by FEM analysis. The Taguchi Method was used to draw optimized condition of bearing position and it's stiffness. From these results, amplitude of vibration is enough good less than 3
pk-pk of the spindle of 40,000rpm manufactured in this work by the optimal design.
Thermal Analysis of Vehicle Radiator
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 18~23
This study analyzes the thermal stress at automotive radiators on steady and transient states. The maximum displacement is shown at the lower corner of upper tank with the value of 0.51mm. The displacement becomes smaller at the center of radiator and it becomes larger at this edge. The maximum thermal stress with the value of 62 MPa is shown at the contact between upper tank and cooling plate. Thermal maximum stress with the transient state at the elapsed time of 10 second is lower than that at steady state as much as 0.7%.
A Study on Heat Treatment for Improving Cold Forgeability of a Bearing Steel, SUJ2
Kim, Hae-Ji ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 24~30
In this paper, the effect of heat treatment on forgeability is investigated and an improved heat treatment cycle is proposed for the bearing steel, SUJ2. An application example of a bearing inner race cold forging, which has small cracks in the bottom after backward extrusion and piercing, is found from a cold forging industry. The process is evaluated by finite element analysis and several heat treatment cycles are examined in order to propose an improved heat treatment cycle. The effect of heat treatment on material hardness and tool life, dimensional accuracy and forming load is revealed through experiment.
Multi-signal characteristics for condition monitoring of micro machined surface
Jang, Su-Hoon ; Park, Jin-Hyo ; Kang, Ik-Soo ; Kim, Jeong-Suk ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 31~36
Micro-machining technology has been adopted for shape accuracy of micrometer and sub-micrometer scale, surface roughness of tens nanometer in industries. In micro-machining process the quality of machined surface is derived from machining condition and tooling. This paper investigates AE(acoustic emission) and cutting force signals according to machined surface quality related to machining condition. Machined surface quality was analyzed by the AE and cutting force parameter which reflect surface morphology. The characteristics of signal were extracted for process optimization by monitoring both the tool condition and the machined surface texture in micro end milling process.
Fuel Oil Characteristics of Mulching Waste Vinyl by Indirect Heating Emulsion System
Kim, Hae-Ji ; Kim, Nam-Kyung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 37~42
This paper describes the fuel oil characteristics of mulching waste vinyl by indirect heating emulsion system. For the emulsion experiment of waste vinyl, the system is composed of melting furnace, the 1th pyrolysis furnace, and the 2nd pyrolysis furnace. The mulching waste vinyl is used for the fuel oil characteristics analysis of mulching waste vinyl. The refined oil, gasoline, and diesel oil are extracted and quantified to analysis the fuel oil characteristics. From the results of experiments, it has been shown that the production of fuel oil from mulching waste vinyl is possible using the emulsion system.
A New Approach of Multi-Scale Simulation for Investigating Nano-Scale Material Deformation Behavior
Park, Jun-Young ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 43~47
Recently, an approach for nano-scale material deformation has been developed that couples the atomistic and continuum approaches using Finite Element Method (FEM) and Molecular Dynamics (MD). However, this approach still has problems to connect two approaches because of the difference of basic assumptions, continuum and atomistic modeling. To solve this problem, an alternative way is developed that connects the Quasi Molecular Dynamics (QMD) and molecular dynamics. In this paper, we suggest the way to make and validate the MD-QMD coupled model.
A Study on the Precision Milling Machine Design for Micro Machining
Hwang, Joon ; Ji, Kwon-Gu ; Chung, Eui-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 48~56
This paper presents the results of miniaturized micro milling machine tool development for micro precision machining process. Finite element analysis has been performed to know the relationship between design dimensional variables and structural stiffness in terms of static, dynamic, thermal aspects. Design optimization has been performed to optimize the design variables of micro machine tool to minimize the volume, weight and deformation of machine tool structure and to maximize the stiffness in terms of static, dynamic, and thermal characteristics. This study presents the assessment of the technology incentive for the minimization of machine tool in the quantitative context of static, dynamic stiffness, thermal resistance and thus the accuracy implications. This study can also be provided a basic knowledge for further research of micro factory development.
Design of a Magneto-Rheological Fluid Clutch for Machine Tool Application
Kim, Ock-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 57~63
Magneto-Rheological(MR) fluid composes of a base fluid and ferromagnetic particles less than tens of micrometer size dispersed in the fluid. It is called as a smart material because its rheological properties are changable by a magnetic field. Its important applications are active devices such as controllable dampers and controllable clutches. The merit of those products is that their functional characteristics are controllable such that they enable active control strategies. This paper proposes an idea for machine tool applications of the MR fluid clutch as a safety device for power transmission. FEM has been used for magnetic field analyses and the results are compared with some former experiments. Some design syntheses of the MR clutches are suggested and hopefully considered that it may be an effective safety device for power transmission of machine tools.
Basic Study on Impact Analysis of Automobile
Cho, Jae-Ung ; Min, Byung-Sang ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 64~70
This study is to analyze the impact of automotive body with computer simulation. The total deformation, equivalent strain and strain and principal stress are analyzed respectively in case of front, rear and side impacts. The maximum total deformation of side impact is more than 6 times as large as that of rear impact. The maximum equivalent strain or stress of side impact is more than 4 times as large as that of rear impact. These deformation, strain and stress of front impact are a little more than those of rear impact. The maximum principal stress of side impact is more than 4.5 times as large as that of rear impact. This stress of front impact is a little more than that of rear impact.
The Noise Reduction of Industrial Blower by Optimal Positioning of Buff
Kim, Chang-Ho ; Son, In-Soo ; Ahn, Tae-Soo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 71~76
In a running blower, there are various exciting forces which can generate noise. The noise of an running industrial fan or blower depends on the structure of a fan, the machining accuracy of each element, and assembled conditions. Many studies have been carried out to reduce the noise of it. In this study, 3-hole buffs are used in pipe of blower to study the influence the number and position of buffs on the noise reduction at inlet and outlet in pipe. Commercial engineering software ANSYS and SYSNOISE were employed to analyze the characteristics and reduction ratio of pressure. It is concluded that optimal position and number of buffs in pipe of blower to show the least reduction ratio of pressure.
A Study on the Polishing Characteristics of LCD Glass
Lee, Sang-Min ; Lee, Choong-Seok ; Chae, Seung-Su ; Kim, Taeck-Su ; Park, Hwi-Keun ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 1, 2009, Pages 77~82
This paper reports a kinematic analysis and experimental results for the polishing process of G7 LCD glass. A kinematic analysis for the relative motion of the upper plate and lower plate has been done and computer simulation has been programmed. A series of polishing experiments has also been carried out and compared with analytical data. The experimental results agreed well with analytical ones. The experimental results indicate that the polishing removal is proportional to the relative speed and pressure.