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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 11, Issue 6 - Dec 2012
Volume 11, Issue 5 - Oct 2012
Volume 11, Issue 4 - Aug 2012
Volume 11, Issue 3 - Jun 2012
Volume 11, Issue 2 - Apr 2012
Volume 11, Issue 1 - Feb 2012
Selecting the target year
Application of Birefringence CAE in Mould Design of Optic Lens Injection Molding Process
Yamanoi, Mikio ; Kwak, Tae-Soo ; Jung, Jong-Kyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 1~6
This study is focused on simulation technology in injection molding process for plastic optic lenses. The CAE program,
is used for the injection molding simulation with O-PET resin material. The design for different gate shape and runner layout has been under review by CAE simulation results. Moreover, the prediction of birefringence and polarized light in injection molded optic lenses has been tested by the CAE Program. The simulation results have been expected to effectively use in the design of injection molding mould.
Ceramic Core Processing Technology for the Glass Mold of Aspherical Lenses using High-speed Cutting Machine
Ryu, Geun-Man ; Kim, Hyo-Sik ; Kim, Hong-Tek ; Yang, Sun-Choel ; Jang, Ki-Soo ; Kim, Dong-Ik ; Won, Jong-Ho ; Kim, Geon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 7~12
Ceramic core processing technology using 5-axis high-speed cutting machine is applied to make the glass molds for aspherical ophthalmic lenses. In the technology, optimum processing conditions for aspherical ceramic molds are based on minimal experimental data of surface roughness. Such surface roughness is influenced by fabricating tools, cutting speed, feed rate, and depth of cut, respectively. In this paper, we present that surface roughness and shape accuracy of aspheric ceramic mold obtained by optimum processing conditions are Pa
, respectively, and propose that these values are sufficiently possible to apply to making the glass molds for aspherical ophthalmic lenses.
Cell Activity of ELID-Machined Titanium Surface
Kang, Jong-Ho ; Lee, Myung-Hyun ; Seo, Won-Seon ; Lee, Suk-Won ; Kwak, Tae-Soo ; Choi, Heon-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 13~18
We investigated the cell activity of controlled titanium surface using various grinding methods including ELID (Electrolytic In-Process Dressing) grinding method. The influence of titanium surface condition by each grinding process on the cell activity was evaluated by ALP activity of MSC(Mesenchymal Stem Cells). The ALP activity of controlled surface by ELID grinding process using # 2000 wheel was higher than that of other titanium surface. The morphological, chemical properties of machined surface by grinding method was observed using various analytical method.
Ultraprecision Machining of Glassy Carbon
Hwang, Yeon ; Lee, Hyeon-Sung ; Kim, Hye-Jeong ; Kim, Jeong-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 19~23
Glassy carbon is widely used for high temperature melting process such as quartz due to its thermal stability. For utilizing Classy Carbon to glass mold press(GMP) optical lens, brittleness of Glassy Carbon is main obstacle of ultraprecision machining. Thus authors investigated ductile machining of Glassy Carbon adopting turning and grinding process respectively. From the experiments, ultraprecision turning surfaces resulted brittle crack in all machining conditions and ultraprecision grinding surfaces showed semi-ductile mode in small undeformed chip thickness conditions.
A Study on the Characteristics of High-Speed Small-Diameter Wipe Milling for Al6061
Park, Hwi-Keun ; Lee, Sang-Min ; Lee, Choong-Seok ; Chae, Seung-Soo ; Lee, Won-Seok ; Choi, Yun-Seo ; Jo, Hyun-Taek ; Baek, Young-Jong ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 24~28
In this paper, the high speed milling characteristics of Al6061 was studied. A gantry type milling & tapping center was developed for this study. The cutting force and the resulting surface roughness were measured at various cutting conditions. The experimental results indicate that the surface roughness is relative to the cutting conditions.
A Study on the High Speed Tapping of Magnesium Alloy for IT Parts
Lee, Sang-Min ; Park, Hwi-Keun ; Lee, Won-Suk ; Kim, Taeck-Su ; Chae, Seung-Su ; Lee, Choong-Seok ; Baek, Young-Jong ; Jo, Hyun-Taeck ; Lee, Young-Sik ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 29~34
This paper reports some experimental results in high speed rigid tapping of magnesium alloy(AZ91D). M3 spiral tap and high speed spindle tapping center of gantry type were used in experiments and thrust forces were measured. The experimental results indicate that the thrust forces are proportional to the spindle speed and depth of cut. The thrust forces increase as the depth of cut increases. M3 Tapping was achieved at the spindle speed of 10,000rpm, depth of cut of 1.5D and total stroke of 32mm.
A Study on the Flow Characteristic of High Pressure 3/2-Way Valve for a Ship Engine
Park, Si-Beom ; Kim, Jin-Mi ; Lee, Chul-Jae ; Kang, Jung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 35~40
The 3/2-way valve supplies the high pressure air to ship engine for starting engine. In this paper, the high pressure 3/2 way valve for ship engine has the goal as reverse engineering by searching the fluid characteristic at this valve. The reverse engineering of 3/2-way valve is measured directly by Verier-calipers and is compared with 3D scanner. The fluid characteristic in this valve is used for a simulation method by ANSYS CFX 12.1. On the contrary, discs and the shaft are as the important components on numerical simulation by controlling the air flow at this valve. The fluid characteristics are seen to make high velocity and complicated vortex around the shaft. And the flow coefficient is calculated in order to apply for industrial field.
Prediction of Surface Roughness on the PCD Tool Turned Aluminum Alloys by using Regression Analysis
Lee, Sun-Woo ; Lee, Dong-Ju ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 41~47
Surface roughness is widely used as an index for processing degree of accuracy. Recently, regression analysis to predict the machining results are actively used to characterize a cutting operations. In the past, diamond machining had been used for ultra precision cutting operation, but now industrial diamond tools like PCD(Polycrystaline Diamond) has been widely used in ultraprecision machining of nonferrous metals. In this study, the authors focus on the effect of PCD tool property on the surface roughness of different types of aluminum alloy after cutting process by CNC operated lathe. Based on the regression analysis approach on a surface roughness data obtained by experiment, predictive analysis of surface roughness is effective to achieve better surface quality.
Calibration of 6-DOF Parallel Mechanism Through the Measurement of Volumetric Error
Oh, Yong-Taek ; Saragih, Agung S. ; Kim, Jeong-Hyun ; Ko, Tae-Jo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 48~54
This paper introduces the kinematic calibration method to improve the positioning accuracy of a parallel mechanism. Since all the actuators in the parallel mechanism are controlled simultaneously toward the target position, the volumetric errors originated from each motion element are too complicated. Therefore, the exact evaluation of the error sources of each motion element and its calibration is very important in terms of volumetric errors. In the calibration processes, the measurement of the errors between commands and trajectories is necessary in advance. To do this, a digitizer was used for the data acquisition in 3 dimensional space rather than arbitrary planar error data. After that, the optimization process that was used for reducing the motion errors were followed. Consequently, Levenberg-Marquart algorithm as well as the error data acquisition method turned out effective for the purpose of the calibration of the parallel mechanism.
Optimization and Structure Analysis of Brake Disc for Free-fall Winch
Ku, Hyoun-Kon ; Kim, Jin-Woo ; Won, Cheon ; Song, Jung-Il ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 55~61
The structure of winch brake disk was successfully designed and developed based on sizing optimization. In this research, static analysis was performed by commercial software ANSYS v12.0. To simulate the working process of disk brake, the real properties of materials and working conditions were considered. Based on the results of the static structural analysis, the existing designs of the brake discs were optimized. Among existing designs, there are three cases that have achieved an efficient light weight around 200g. As a result, the optimized weight of each case was 3.41kg, 3.42kg, and 3.44kg, respectively. Finally, through prototyping and performance testing, the stability of the optimized brake disc was verified. Although, this free-fall winch brake disk had been developed in design and evaluation techniques, more detailed plans for developing the disk brake structure were also proposed as a further study based on this research.
Development of Excitation Table for 2-dimensional Vibrational Micro Cutting
Kim, Gi-Dae ; Lee, Kang-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 62~67
To realize 2-dimensional vibrational micro cutting in milling and drilling, etc. where the tools rotate, it could be a promising way to vibrate a workpiece instead of a rotating tool itself. In this study, an excitation work-table was developed using two piezoelectric materials orthogonally arranged. The trochoidal trajectory of a cutting tool which is necessary for 2D vibrational cutting is enabled in the excitation condition of higher excitation frequency and larger amplitude of vibration and the cutting condition of smaller diameter of cutting tool and lower spindle speed. The various trochoidal trajectories of a cutting tool could be generated in the excitation work-table by adjusting the input voltages to two piezoelectric materials and the phase between the two voltages and the trajectories could be readily used for the 2D vibrational micro cutting.
An Experimental Study of Al2017 on Characteristics of the Surface Roughness in Machining Center Processing
Kim, Chan-Young ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 68~72
Al2017 is typical Duralumin of self-hardening aluminum alloy. It is lightweight, formability and machinability so throughout the industries have widely used automobile, electronics, semiconductor and aircraft as material. A variety of CNC machine tool processing technology, scientific principles and experience have been studied in order to increase accuracy and productivity. Using a machining center is to constant amount of side step and cutting characteristics studied changing depth of cut, revolution per minute and feed rate.
A Study on the Relation Between Expansion and the Characteristics of Surface in the ED-Drilling
Choi, Jong-Yeun ; Kim, Kyeong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 73~79
This paper describes the machining characteristics of the sintered carbide and die steel(STD-11) by electric discharge drilling with various tubular electrodes. Electrical discharge machining(EDM) removes material from the workpiece by a series of electrical sparks that cause localized temperatures high enough to melt or vapourize the vicinity of the charge. In the experiment. four types of electrode which have different diameter are used with the application of continuous direct current and axial electrode feed. The controlled factors include the dimension of the electrode. In drilling by EDM, the dielectric flushed down the interior of the rotating tube electrode, in order to order to facilitate the removal of machining debris the hole. The expansion increase with increasing the thickness of material and the diameter of electrode and the expansion of sintered carbide is 1.75 times large then that of die steel. The taper of machined hole decrease with increasing the thickness of material. The crater sixe of die steel is larger then thet of sintered carbide and the surface roughness of sintered carbide is 1.58 tims larger then that of die steel.
Design of Tool for Food Cutting with Ultrasonic Waves
Park, Woo-Yeol ; Jang, Ho-Su ; Kim, Jung-Ho ; Park, Dong-Sam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 80~85
The ultrasonic cutting method is which cutting by applying high frequency vibrational energy into specific area at constant pressure. Ultrasonic cutting is consisted of power supply, transducer, booster and cutting tool. Precise designing is required since each part's shape, length and mass can affect driving frequency and vibration mode. This paper focused to cutting tool design, its length L was set by calculating vibration equation. And the value of the shape parameter a was diversified as the integral multiple and the result of 40,189Hz the analysis of Modal was shown in the length 30mm of the result of performance b in the 11th mode Also by performing harmonic response analysis, the frequency response result was 40,189Hz, which was similar to modal analysis result.
Door Effort Analysis for Door Checker of Integrated Type with Torsion Bar Spring
Yoon, Sang-Min ; Kang, Sung-Jong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 86~91
Door effort was calculated for a new door checker with torsion bar spring and integrated checker case by FE analysis. A hybrid checker arm which has peaks and valleys only on the upper surface was adopted to reduce noise in operation and make operation with more distinctive steps. The checker arm was modeled using shell elements to estimate both the longitudinal and the lateral resistance force by checker arm. By combining the checker arm resistance force obtained from analysis and the door self-closing force by the theoretical calculation, door effort was predicted to show the good correlation with test results. In addition the unrolling effect of roller model was investigated and a new roller type for more smooth rolling was studied.
Design of Injection Molding Process Factors Blower Fan using the Taguchi Method
Kim, Kyeong-Hwan ; Choi, Jong-Yeun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 92~97
Injection mold is a manufacturing process used to produce parts of complicated shape at a low cost. Many factors affect the quality of injection molded part during injection molding process. A study on the optimization of injection mold is progressed by using a simulation software like Moldflow. Filling, packing and cooling phases of injection molding processes are analyzed according to the mold design considering the shrinkage of molded part, the degree of filling rate and the wearing of a mold. Taguchi method is applied to analyze the significance of processing parameter and the dynamic characteristics according to the variation of processing parameters. From the results, the mold temperature and packing pressure influenced the shrinkage of injection molded part.
A Study on the Side-Cut Grinding using the CBN Wheels
Lee, Choong-Seok ; Kim, Chang-Su ; Park, Won-Kyue ; Lee, Jong-Chan ; Choi, Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 98~103
One of the problems in the grinding process using the machining center(MC) with a small diametric wheels is machining error due to decrease of the quill diameter. In this thesis, side-cut grinding is performed with a vitrified bonded CBN wheel on the machining center to establish the basis of the grinding using MC. The grinding force and machining error are investigated experimentally for the change of the machining condition. It is possible to estimate the machining performance by the ratio of the setting depth of cut and actual depth of cut. In addition, the relation between normal grinding force and machining error is presented by the experimental formula.
A Basic Research for the Development of Generalized Shape Guided Automatic Deburring Machine
Kim, Sang-Myng ; Jung, Yoon-Gyo ; Cho, Sung-Leem ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 104~109
Recently, the deburring process which is last process of manufacture is one of the important process for complete product. The manual deburring process can cause not only higher error rate but also irregular shape and quality of product. Therefore, Shape Guided Automatic Deburring Machine has been developed to resolve the above problems. But the Shape Guided Automatic Deburring Machine have been applied only to produce a circular product. Therefore, this machine is difficult to apply to products of various shapes. To solve this problem, we would like to develop Generalized Shape Guided Automatic Deburring Machine applicable to various shapes. To this end, we have done the modeling and design using CATIA program and have performed machine simulation.
Effect of Cutting Conditions on Surface Roughness in CNC Lathe C-axis Milling Cutting
Shin, Kuk-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 110~115
For domestic aircraft industry, not mass production of components is limited, small production scale of the order is made by part because many kinds of hundreds of thousands of kinds of small quantity batch production system are taking. But the high reliability and stability are required during the processing because they require high precision parts are required. It is found that when C-axis rotation speed was increased, the diameter of the cutting tool decreased with increasing surface roughness, while the turn-mail feed rate was increased with increasing the surface roughness.
Analytical Prediction of Transmission Error and Load Distribution for a Plugin HEV
Zhang, Qi ; Kang, Jae-Hwa ; Yun, Gi-Baek ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 116~121
In recent years, world is faced with a transportation energy dilemma, and the transportation is dependent on a single fuel - petroleum. However, Hybrid Electric Vehicle(HEV) technology holds more advantages to reduce the demand for petroleum in the transportation by efficiency improvements of petroleum consumption. Therefore, there is a trend that lower gear noise levels are demanded in HEV for drivers to avoid annoyance and fatigue during operation. And meshing transmission error(T.E.) is the excitation that leads to the tonal noise known as gear whine, and radiated gear whine is also the dominant source of noise in the whole gearbox. This paper presents a method for the analysis of gear tooth profile and lead modification, and the predictions of transmission error and load distribution are shown under one loaded torque for the 1st gear pair of HEV gearbox. The test is also obtained before tooth micro-modification under the torque. At last, the appropriate tooth modification is used to minimize the transmission error and load distribution under the loaded torque. It is a good approach which the simulated result is used to improve the design in order to minimize the radiation gear whine noise.
Structural Durability Analysis According to the Thickness of Bicycle Frame Tube
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 122~129
This study investigates structural and vibration analyses according to the thickness of bicycle frame tube. The model of bicycle frame has the dimension as length of 862mm, width of 100mm and hight of 402.5mm. There are 3 kinds of models with tubes of top, down and seat at bicycle frame as thicknesses of 10, 15 and 20mm. The maximum displacement and stress occur at the center part of seat stay and at the installation part of rear wheel respectively. Maximum displacements become 0.031936, 0.029159 and 0.027984mm in cases of thicknesses of 10, 15 and 20mm respectively. In case of thickness of 20mm among 3 cases, maximum displacement becomes lowest. But maximum stresses become 10.019, 8.5492 and 9.2511MPa in cases of thicknesses of 10, 15 and 20mm respectively. In case of thickness of 15mm among 3 cases, maximum stress becomes lowest. There is no resonance at practical driving conditions and natural frequency remains almost unchanged along the change of thickness. In case of the displacement due to vibration mode, the displacement difference at thickness between 15mm and 20mm becomes 1/2 times than that between 10mm and 15mm. Design at bicycle frame tube becomes most economical and durable effectively in case of thickness of 15mm among 3 cases.
Stress Analysis on the Profile of Blast Wall with Finite Element Method
Kim, Byung-Tak ; Koh, Sung-Wi ; Kim, Kwang-Heui ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 130~137
Blast walls are integral structures at the typical offshore topside module to provide safety barriers for personnel and critical equipment against any blast loading and hydrocarbon explosions. The blast wall structures are usually configured with stainless steel. It can be referred as the good mechanical properties of the stainless steel against blast load, which features the characteristics of significant energy absorption and ductility. In this study, the proposed designs of corrugated panel are examined in order to determine the best design which satisfies the design criteria. The criteria on maximum deflection and stress are used to decide the best design. The effect of inclined angle of profile on deformation characteristics of blast wall is also performed. The numerical study was performed by using NX Nastran 7.5.
The Study on the Improvement of Mechanical Performance due to Change in Temperature and Sputtering by
Material of Bonded Dissimilar Materials with Cylindrical Shape
Lee, Seung-Hyun ; Choi, Seong-Dae ; Lee, Jung-Hyong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 138~145
The material used in this study is dielectric and ferrite. Because of the unique characteristics of the material, it is easily exposed to external shocks and pressure, which cause damage to the product. However, after being processed under high-temperature environment repeatedly, the mechanical strength of the product is greatly increased due to the change of the electrical properties. In this paper, dielectric and bonded ferrite material was tested for the material properties. The equipment for this experiment was produced and tested to allow Cylindrical and Three-dimensional geometry of the product for the vacuum deposition. For Cylindrical shape of the product, in order to obtain the equivalent film thickness, the device is constructed in a vacuum chamber which gives arbitrary revolving and rotating capability. The electrical performance of the product is obtained through this process as well. However, as mentioned above, with repeating processes under high temperature and exposure to external environment, the product is easy to be broken. This experiment has enabled us to find out a stable condition to apply the communication of the RF high frequency to each of the core elements, such as Ferrite and Dielectric which is then used for the mechanical strength of the Raw material, hetero-junction material, Hetero-junction Ag Coating material and hetero-junction Ag Coating SiO2 Coating material respectively.
A Study on Correction of CIRCLE Product Error by Prototype using Rapid Prototyping System
Kim, Won-Jung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 146~153
RP system which is widely used to reduce the time of product development is to resolve the problem of cutting work. It is a method using laminated thin films to produce many forms. The RP equipment used for this experiment is FDM system. This can produce 3D model with using 3D CAD designed file within a relatively short time. Not only this, this system also through 3D file preparation, 3D product manufacture, removal support these 3 step operating process can easily produce goods, but product can be different from original design. This research has been conducted to minimize this error. To apply to the circular product made a circular specimen and measured several times with 3D scanner and find out average 99.622% of accuracy. This result is applied to RP system, and with this changed design produced a specimen, and found out the accuracy is increased to 99.958%. If this is applied to circular products, we can produce more precise products with less process.
A Numerical Analysis Study on Plate Heat Exchanger Heat Transfer Characteristic by Corrugation Angle and Pitch
Kang, Dae-Ki ; Kim, Si-Pom ; Hwang, Il-Ju ; Lee, Jae-Hoon ; Do, Tae-Wan ; Yeo, Woon-Yeop ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 154~159
For numerical analysis of the plate heat exchanger, a lot of time are required in modeling work and calculation. Whereas, this paper was purposed to identify characteristic of the plate heat exchanger through simplification of modeling by interpreting the numerical analysis proximity with the actual model. This study was also examined temperature difference between inlet side and outlet side, inner pressure drop, heat transfer area of plate and change of heat transfer coefficient on the plate depending on the inner corrugation angle and corrugation pitch of a herring bon pattern of the plate heat exchanger among chevron types of the plate exchanger.
A Numerical Analysis Study on the Characteristics for Packing Design of Cryogenic Gate Valve
Kim, Si-Pom ; Jeon, Rock-Won ; Hwang, Il-Ju ; Lee, Jae-Hun ; Kang, Dae-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 160~165
The packing, among the components comprising the gate valve, is used to sustain the air-tightness and the study on change of shape or pattern has been carried out to maximize the functions, but the study on changing the location or the size of the packing in a bid to prevent the freezing has rarely been implemented. Thus, This study is intended to evaluate the thermal strain of packing by heat transfer from territory of extremely low temperature as well as the temperature distribution to the upper part of the packing using numerical analysis method.
A Study on the Thermal and Flow Characteristics of Wind and Radiant Heat Shield for Offshore by using Mesh Screen
Yi, Chung-Seob ; Chin, Do-Hun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 166~173
This study is about comparison of thermal and flow characteristics on the wind & radiant heat shield with STS mesh type screen for offshore. Numerical analysis was conducted to find transmission coefficient in the mesh and then analyse the flow characteristics about wind & radiant heat shield. The experiment method of solar radiation has been used as thermal radiation source to get the performance of radiant heat shield measurement. The sensor radiation device has been used to measure the reduction of solar radiation with various size of cells and at a distance of 0.5m and 1m from the cold face of the wind & radiant heat shield.
A Study on the Rotation Accuracy According to Unbalance Variation of High Precision Spindle Unit for Machine Tool
Kim, Sang-Hwa ; Kim, Byung-Ha ; Jin, Yong-Gyoo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 174~181
The spindle unit is a core part in high precision machine tool. Rotation accuracy of spindle unit is needed for high dignity cutting and improving the performance of machine tool. However, there are many factors to effect to rotational error motion(rotation accuracy). This study studied how rotational error motion is variation when unbalance amount is variation. Rotation accuracy of initial spindle unit is decided depending on parts and assembly such as bearing. When it is rotation, vibration and noise is appeared depending on volume of unbalance amount, so it works to decrease unbalance amount. The purpose of the study tests that unbalance amount how much effects to initial rotation condition. The result of the study shows that accuracy of parts and assembly is highly necessary to reach high rotation accuracy and unbalance amount hardly effects to initial rotation accuracy. However, it shorten spindle's life because vibration and noise is increasing by increasing unbalance amount and we can expect situation that rotation accuracy is falling by long time operation.
A Study of Vibration Characteristic for Semiconductor Chip Test Equipment
Hong, Sung-Keun ; Lee, Chul-Hee ; Bak, Jeong-Hyun ; Lee, Kwang-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 182~186
This paper aims to analyze the vibration characteristics of the test equipment that inspects any defects in manufactured semiconductor chips and classifies defective chips. This type of equipment should be robust against any vibrations because such vibrations can cause disruption in the process that requires higher precision. 3D model of the structure of the equipment has been used to configure vibration simulation model. Model analysis have been carried out to analyze which part of the equipment is weak against vibration. To minimize the vibration effect of the equipment, the thickness of the plate consist of the equipment and weights are modified. The results show that thicker plate and higher weight in the equipment can decrease vibration effect.
A Application Method of Engine-Generator Power System in Ambulance
Jung, Won-Seok ; Lee, Bong-Seok ; Sim, Han-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 3, 2012, Pages 187~192
Recently, the electric device has been launching owing to the development of industry. That development also can maximize the efficiency of generator. The emergency rescue vehicle operation differs from ordinary vehicles in engine life and usage distances. For the application of this system, this research proposes the ways to operate the emergency rescue vehicle operations more efficiently. Currently, many power systems, especially motors, developed with a large output of power. It is possible to produce electricity in the engine room with enough space and to operate all equipment within the rating load capacity.