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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 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
A Study on the Characteristics of a Wafer-Polishing Process at Various Machining and Oscillation Speed
Lee, Eun-Sang ; Lee, Sang-Gyun ; Kim, Sung-Hyun ; Won, Jong-Koo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 1~6
The polishing of silicon wafers has an important role in semiconductor manufacturing. Generally, getting a flat surface such as a mirror is the purpose of the process. The wafer surface roughness is affected by many variables such as the characteristics of the carrier head unit, operation, speed, the pad and slurry temperature. Optimum process conditions for experimental temperature, pH value, down-force, slurry ratio are investigated, time is used as a fixed factor. This study carried out a series of experiments at varying platen, chuck rpm and oscillation cpm taking particular note of the difference between the rpm and the affect it has on the surface roughness. In this experiment determine the optimum conditions for polishing silicone wafers.
Chemical and Mechanical Balance in Polishing of Electronic Materials for Defect-Free Surfaces
Jeong, Hae-Do ; Lee, Chang-Suk ; Kim, Ji-Yoon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 7~12
Chemical mechanical polishing(CMP) technology is faced with the challenge of processing new electronic materials. This paper focuses on the balance between chemical and mechanical reactions in the CMP process that is required to cope with a variety of electronic materials. The material properties were classified into the following categories: easy to abrade(ETA), difficult to abrade(DTA), easy to react(ETR) and difficult to react(DTR). The chemical and mechanical balance for the representative ETA-ETR, DTA-ETR, ETA-DTR and DTA-DTR materials was considered for defect-free surfaces. This paper suggests the suitable polishing methods and examples for each electronic material.
A Study on a Ultrasonic Vibration Assisted Grinding of Alumina Ceramic with Diamond Grinding Tool
Choi, Young-Jae ; Song, Ki-Hyeong ; Park, Kyung-Hee ; Hong, Yun-Hyuck ; Kim, Kyeong-Tae ; Lee, Seok-Woo ; Choi, Hon-Zong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 13~19
In this study, ultrasonic vibration tool designed and made by using FEM analysis. And machining test was carried out in various machining conditions using ultrasonic vibration capable CNC machine. For work material, alumina ceramic (
) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonic vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic mode, ultrasonic vibration of 20kHz was generated by HSK 63 ultrasonic actuator. The two grinding speeds, 1.67m/s and 3.35m/s, were applied. On the other hand, grinding forces were measured by KISTLER dynamometer.
A Study on the Structural Analysis of Automotive Crankshaft Multi Grinding Machine
Choi, Yun-Seo ; Lee, Won-Suk ; Hwang, In-Hwan ; Park, Hwi-Keun ; Jo, Hyun-Taek ; Lee, Young-Sik ; Kim, Ki-Jung ; Song, Soon-Tae ; Lee, Jong-Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 20~25
A Crankshaft multi grinding machine is developed for manufacturing of high precision crankshaft. The grinding head part of the developed machine should be moved precisely during grinding of work materials. In this paper, structural and modal analysis for the crankshaft multi grinding machine is carried out to check the design criteria of the machine. The analysis is carried out by FEM simulation using the commercial software. The machine is modeled by placing proper shell and solid finite elements. The results of structural and modal analysis confirmed that the structural characteristics of grinding machine and the structural safety are considered secure.
The Study on the Wafer Surface and Pad Characteristic for Optimal Condition in Wafer Final Polishing
Won, Jong-Koo ; Lee, Eun-Sang ; Lee, Sang-Gyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 26~32
Polishing is one of the important methods in manufacturing of Si wafers and in thinning of completed device wafers. This study will report the characteristic of wafer according to processing time, machining speed and pressure which have major influence on the abrasion of Si wafer polishing. It is possible to evaluation of wafer abrasion by load cell and infrared temperature sensor. The characteristic of wafer surface according to processing condition is selected to use a result data that measure a pressure, machining speed, and the processing time. This result is appeared by the characteristic of wafer surface in machining condition. Through that, the study cans evaluation a wafer characteristic in variable machining condition. It is important to obtain optimal condition. Thus the optimum condition selection of ultra precision Si wafer polishing using load cell and infrared temperature sensor. To evaluate each machining factor, use a data through each sensor. That evaluation of abrasion according to variety condition is selected to use a result data that measure a pressure, machining speed, and the processing time. And optimum condition is selected by this result.
Experimental Study of Influence of Nozzle Design on Removal of Melted Materials in Laser Cutting Process
Son, Sang-Hyuk ; Lee, Seok-Joon ; Lee, Yeol ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 33~38
An experimental study was carried out to observe the characteristics of impingement of assist gas from a rectangular supersonic nozzle on kerf surface in laser machining. A micro-scale supersonic (Mach number 2.0) rectangular nozzle system was designed and fabricated for the purposes, and hot tests of the performance of the nozzle system was proceeded in the ITI corporation laboratory. For various related parameters such as laser powers, nozzle pressures and cutting speeds, the quality of the frontal view of cut edge surfaces was observed by a microscope. In the study, it was shown that the application of the present micro-rectangular supersonic nozzle in an off-axis configuration made it possible to cut a mild steel, by combinations of relatively low laser - powers, large standoff distances, and assist gas with no oxygen, which was not achieved by conventional laser cutting processes.
Characteristics of Surface Roughness in the Wire-Cut Electric Discharge Cutting Conditions of Aluminium Alloy 2024
Lee, Soon-Kwan ; Ryu, Cheong-Won ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 39~45
Currently, the aircraft industry, aircraft parts as well as airframe have been developed in producing, the aircraft parts and fuselages have been produced the product by cutting rather than forging and casting because of the residual stress and stress concentration. In this study, the aircraft is being used in many parts of aluminium alloy 2024 in wire-cut E.D.M. The selected experimental parameters are peak current, no-load voltage, off time and feed rate. It is found that cutting mountain part on surface roughness of the curve 0.3mm than 0.25mm diameter wire electrode is stable in many uniform distribution.
The Evaluation of Cylindrical Gear Measurement on Teeth Roots and Bottom Profiles in Different Sections
Moon, Sung-Min ; Kang, Jae-Hwa ; Kido, Hiromitsu ; Kurokawa, Syuhei ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 46~49
Gears are reliable and efficient power transmission elements. They have been widely used in all kinds of machinery. Nowadays, resource conservation energy conservation environmental improvements from the request of the compact, light weight, high efficiency, low cost Higher efficiency is required. Tooth root and bottom profiles of cylindrical gears affect bending fatigue life, but they are hard to measure with conventional gear measuring machine(GMM), because GMM is normally customized to measure only gear working flanks. The authors try to develop a new type of GMM by installing an extra 3D scanning probe and control software to measure tooth root and bottom profiles. First, in order to measure in various directions, a 3D scanning probe has been attached to the GMM developed. Next, calibration algorithm has been developed. Deviations of the calibration results are measured and it is found that systematic error must be caused by heat from driving motors. A new alternative GMM with driving motors generating less heat was designed and two GMMs are compared. Finally, 3 Dimension measurement of tooth root and bottom profiles of cylindrical gears is described.
A Study on the Thermal Characteristics of a High Speed Spindle according to the Cooling Existence of Rear Part and the Cooling Conditions
Choi, Dae-Bong ; Kim, Soo-Tae ; Lee, Seog-Jun ; Kim, Chang-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 50~55
The important problem in high speed spindle is to reduce and minimize the thermal effect by motor and bearing. This paper presents the thermal characteristic analysis for a high speed spindle with and without cooling at the rear part, considering the viscosity and the flow rate of cooling oil. A high speed spindle is composed of angular contact ceramic ball bearings, high speed built-in motor, oil jacket cooling and so on. The thermal analyses of high speed spindle need to minimize the thermal effect and maximize the cooling effect and they are carried out under the various cooling conditions. Heat generations of the bearing and the high speed motor are estimated from the theoretical and experimental data. This result can be applied to the design and manufacture of a high speed motor spindle.
Stability Analysis of Axially Moving Beam with Attached Mass
Hur, Kwan-Do ; Son, In-Soo ; Ahn, Sung-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 56~61
The dynamic instability and natural frequency of axially moving beam with an attached mass are investigated. Thus, the effects of an attached mass on the stability of the moving beam are studied. The governing equation of motion of the moving beam with an attached mass is derived from the extended Hamilton's principle. The natural frequencies are investigated for the moving beams via the Galerkin method under the simple support boundary. Numerical examples show the effects of the attached mass and moving speed on the stability of moving beam. Moreover, the lowest critical moving speeds for the simple supported conditions have been presented. The results can be used in the analysis of axially moving beams with an attached mass for checking the stability.
Basic Experimental Investigations to UV Laser Micro-Machining of Nano-Porous Alumina Ceramic Material
Shin, Bo-Sung ; Lee, Jung-Han ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 62~67
Recently UV laser is widely used to process micro parts using various materials such as polymers, metals and ceramics because it has a very high intensity at the focused spot area. It is generally known that there are still some difficulties for alumina(
) ceramics to directly make micro patterns like holes and lines on the surface of working material using 355nm UV laser because the alumina has a very low absorption coefficient at that wavelength. But nowadays new alumna with nano-porous holes is developed and applied to advanced micro functional parts of IT, BT and BT industries. In this paper, we are going to show the mechanism of photo-thermal ablation for nano-porous ceramics. Inside hole there is a lot of multiple reflections along the depth of hole. Experimentally we can find the micro hole drilling and micro grooving on the surface of nano-porous alumina.
Optimal Synthesis of Steering Mechanisms Considering Transmission Angles
Park, Jong-Keun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 68~75
In this study, the optimal synthesis of planar steering mechanisms for vehicles is studied. The author minimized the steering error between two front wheels subject to the constraints of transmission angles. Nonlinear programming methods such as BFGS method and golden section search method are used for this optimization. As numerical examples, Ackermann's steering mechanism, 6-link and 10-link planar mechanism are adopted to check the usefulness of this method. Consequently, among the three optimized mechanisms, 10-link planar one conducts far more accurate performance subject to tight constraints of transmission angles.
A Horn of Half-Wave Design for Ultrasonic Metal Welding
Jang, Ho-Su ; Park, Woo-Yeol ; Park, Dong-Sam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 76~81
Ultrasonic metal welding is one of the welding methods which welds metal by applying high frequency vibrational energy into specific area at constant pressure, avaliable in room temperature and low temperature. Ultrasonic metal welder is consisted of power supply, transducer, booster, and horn. Precise designing is required since each parts' shape, length and mass can affect driving frequency and vibration mode. This paper focused to horn design, its length L was set to 62mm by calculating vibration equation. By performing modal analysis with various shape variable b times integer, when length of b is 30mm the output was 39,599Hz at 10th mode. Also by performing harmonic response analysis, the frequency response result was 39,533Hz, which was similar to modal analysis result. In order to observe the designed horn's performance, about 4,000 voltage data was obtained from a light sensor and was analyzed by FFT analysis using Origin Tool. The result RMS amplitude was approximately 8.5
at 40,000Hz, and maximum amplitude was 12.3
. Therefore, it was verified that the ultrasonic metal welding horn was optimally designed.
Evaluation of Fatigue Strength in Ductile Cast Iron by Maximum and Mean Size of Graphite
Yoon, Myung-Jin ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 82~87
For different ferrite-pearlite matrix structure, contain more than 90% spheroidal ratio of graphite, GCD 45-3, GCD 50, GCD 60 series and 70%, 80%, 90% spheroidal ratio of graphite, GCD 40, GCD 45-1, GCD 45-2 series, this paper has carried out rotary bending fatigue test, estimated maximum and mean size of spheroidal graphite, investigated correlation. It was concluded as follows. (1) Fatigue limit in
cycles and numbers of spheroidal graphite per 1
was linear relation. (2) projection area of graphite can be used to predict fatigue limit of Ductile Cast Iron. The Statistical distribution of extreme values of projection area of defects may be used as a guideline for the control of inclusion size in the steelmaking processes.
Investigation of Stress Concentration and Fatigue Life of Axle Drive Shaft with Relief Groove
Shin, Jae-Myung ; Han, Seung-Ho ; Han, Dong-Sub ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 88~94
An axle drive shaft with double joint shaft, cross kit and yoke has an important role by transferring power and changing steering angle between axle and wheel in power train system. It has been used widely in the heavy machinery requiring a high reliability in the power train system. At fatigue failures of the axle drive shaft with the long span, a relatively high stress concentration at a snap ring groove on the drive shaft brings to significant fatigue damages under repeated loading condition. As Peterson's suggestions on this study, a relief groove in the vicinity of the snap ring groove is applied by decreasing the stress concentration and improving the fatigue life of axle drive shaft. By using FEM analysis, the decreasing effect of the stress concentration and extended fatigue life are due to the change of design parameters related with size and location of the relief groove. The relief groove with the design parameters such as d/b=2.0 and r/h=1.2 enables to decrease the stress concentration of 22.3% and increase the fatigue life more than 3 times by comparing with no relief groove application.
Structural Analysis and Optimization of a Pedestal for Deck Crane
Choi, Dong-Hwan ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 95~100
A deck crane is installed on the deck of a ship when there is no adequate facility for loading and unloading in dock or harbor. Deck cranes in Korea have been imported from abroad, and the import-substitution effect will arise if its production can be localized. Now, it is required to suggest the structural design of a deck crane that meet the domestic criterion, considering loading condition. In this study, the structural analysis of a pedestal in the deck crane was peformed by finite element method to investigate the strength requirement. In addition, the structural design of a pedestal was suggested by using ANSYS and VisualDOC. The optimized structure of a pedestal was determined, considering lightweight design.
Determination of Forming Conditions of Fitting Pipes using Press Forming Processes
Kim, Tae-Gual ; Park, Young-Chul ; Park, Kyoung-Yong ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 101~106
The press bulging process is very useful and productive method to produce round-type mechanical components which have not been able to be manufactured because of limitation of the conventional press technology. The application of the press bulging process has expanded very quickly in the hydraulic and electronic industry and more recently it has been used to produce other mechanical parts such as the automobile and shipping parts. This expanding application also has brought some unsolved problems and leads many researchers to put their effort into the die design of the press bulging process. In this study, to obtain the optimum die shape for the press bulging process, various process parameters have been considered such as corner radius, bulging height, pressing length, and forming load, etc. The main interest of this paper is to verify the press bulging process which has more than 4.0 in height-length ratio. From this aspect, Finite Element analysis shows great ability to simulate the precise deformation process and gives us manufacturing database. Consideration of strain, stress, and strain-rate for the various cases has been also taken to keep the forming load within a particular range.
Analysis of the Sir Flow due to the Number of Electric Fan Blades
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 107~112
Air flow and its pressure at electric fan according to three, four and five blades are analyzed in this study. As the number of blades increases at the same condition of specification, air tends to converge and becomes natural wind but higher power is consumed. And the velocity of wind is decreased as the space between winds becomes narrow. The turbulent flow is happened in the center of the body of revolution and the kinetic energy becomes largest in case of three blades. The pressure is decreased than atmospheric pressure from fan to outlet. As the number of blades increases, the pressure drop becomes smaller and is smallest in case of the fan with three blades. As the study result, The electric fan with three blades is thought to be effective in view of power consumption and design.
A Study on the Development of Twist Wheel Type Waste Vinyl Remover(I) - Development of Self-Propelling Type Vinyl Remover -
Ha, Yu-Shin ; Park, Kyu-Sik ; Kim, Jin-Hyun ; Choe, Jung-Seob ; Son, Chul-Min ; Nam, Sang-Heon ; Kim, Tae-Wook ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 113~118
Mulching vinyl is used on field crops to reduce herbicides and this causes multiple effects. The mulching vinyl must be collected for the next crop season, but was left alone due to a shortage of labor. The used mulching vinyl that was left alone acted as one of the main sources of environmental pollution on farms. In order to solve these problems, a self-propelling vinyl remover was developed. The self-propelling vinyl remover consists of a travelling part and rotating of remover wheel. Each output device has a 1.5ps engine and a 2.5ps engine. The vinyl was twisted 17~47cm/times length. The bobbin's diameter was 160mm and it's stable travelling speed was 0.5m/s. The revolution of the remover wheel bobbin was 60rpm to maintain the wheel's linear velocity. As seen at performance test at the field which had 950mm ridge intervals and 10a area, the average working speed was 0.56m/s and the turning time was 15seconds. Therefore, the working performance was 40.1min/10a.
A Study on the High Speed Machining of Major Structure in Aircraft
Lee, Uoo-Myeong ; Kim, Nam-Kyung ; Kim, Hae-Ji ; Jang, Jeong-Hwan ; Yulkok Ltd., Yulkok Ltd. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 119~124
The study on high speed machining was conducted for wing and rib parts of major structure in aircraft in order to investigate a optimal cutting condition and machining method using a high speed machine with 33,000rpm. Preliminary tests, such as high speed cutter test and spindle vibration test of high speed machine, were performed and the high speed machining was conducted in 3times after the preliminary test results were applied to a NC program for manufacturing.
Structural and Fatigue Analysis on Shock Absorber Mount of Automobile
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 1, 2012, Pages 125~133
This study aims at structural analysis with fatigue on the shock absorber mount of automobile. Two kinds of mount as original model 1 and reinforced model 2 are applied. Among the cases of nonuniform fatigue loads at both models, 'SAE bracket history' with the severest change of load becomes most unstable but 'Sample history' becomes most stable. In case of 'SAE bracket history' or 'SAE transmission', the maximum fatigue life at model 2 is 5 to 6 times as much as model 1 and the minimum damage at model 2 is decreased 5 to 6 times as much as model 1. In case of 'Sample history' as slow fatigue loading history, the minimum damage at model 2 becomes same as model 1 but the maximum fatigue life at model 2 is decreased more than 17 times as much as model 1. In case of 'Sample History' with the average stress of -
and the amplitude stress of 0MPa to
, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 times more than the damage possibility of 'SAE bracket history' or 'SAE transmission'. Safe and durable design of shock absorber can be effectively improved by using this study result on mount frame.