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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
Flow Analysis for the Sludge Pneumatic Dehydrator with Cyclone Type
Kim, Bong-Hwan ; Jung, Dae-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 1~6
Air drying technology was developed as an equipment for reducing of moisture content from wastewater treatment and waterworks sludge cake and reproducing it by reusable matter. Advantage of cyclone type pneumatic dehydrator is simple and excellent drying performance. The air drying equipment was composed to the air ejector which made high-speed fluid field, and cyclone which made circling fluid field. Dewatered cake was crushed at the high-speed zone as first step, and formed with dried powder of sphere shape by the collision between particles at the circling fluid zone. In this study, a CFD analysis has been performed to predict air-sludge particles flow in cyclone and ejector of pneumatic dehydrator. The computational results showed typical Rankine vortex structure which was frequently found in swirling flow phenomena. And the conical type wedge in lower part of a cyclone prevented accumulation of the sludge particles in the cyclone. Therefore, this technology was effective in drying of dehydrated cake of waterworks sludge.
Development of Post-Processor and Cutting Motion Simulator for 5-axis CNC Laser Cutting Machine
Kang, Jae-Gwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 7~13
Five-axis laser cutting has great advantages when it is applied to 3-dimensional machining requiring high cutting quality. For developing 5-axis CNC laser cutting systems, however, many problems such as rotating a laser head or a working table, 5-axis servo-control mechanism, tool path generation and post processing, and collision avoidance between a laser head and a work-piece should be solved. In this paper, we deal with developing a dedicated CAM system based on UG-NX3 for 5-axis laser cutting machine. Two essential modules such as post-processor and cutting motion simulation was developed. The developed system was applied to cutting curve defined on 3-D workpiece in order to show the validity of the proposed methods.
Fabrication of lab-on-a-chip on quartz glass using powder blasting
Jang, Ho-Su ; Park, Dong-Sam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 14~19
Micro fluid channels are machined on quartz glass using powder blasting, and the machining characteristics of the channels are experimentally evaluated. The powder blasting process parameters such as injection pressure, abrasive particle size and density, stand-off distance, number of nozzle scanning, and shape/size of the required patterns affect machining results. In this study, the influence of the number of nozzle scanning, abrasive particle size, and blasting pressure on the formation of micro channels is investigated. Machined shapes and surface roughness are measured, and the results are discussed. Through the experiments and analysis, LOC are ettectinely machined on quartz glass using powder blasting.
A study on the surface treatment of titanium alloy by micro abrasive blaster
Kim, Seong-Won ; Wang, Duck-Hyun ; Kim, Won-Il ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 20~27
The characteristics of titanium alloy as a relatively advanced material is low density, avirulent and, superior corrosive resistant, therefore the use of titanium alloy is increasing lately in aerospace and mechanical technologies, precision machinery, electronics industry, petro-chemical industries and biomedical areas. In these days, the titanium alloy product is required various surface qualities of not only smooth surface but also rough surface depending on usages. The purpose of this experimental research is to find the optimum surface roughness of titanium alloy of Ti-6Al-4V, by micro abrasive blasting as depending variable conditions of working pressure, nozzle size, working time, stand of distance and power particle size.
Process Design for Yoke Forming of Unmanned Helicopter
Hur, Kwan-Do ; Kim, Ki-Sung ; Chun, Se-Young ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 28~33
Yoke is a part of rotor in unmanned helicopter. It was transferred power of engine to the rotor. It has been usually produced by machining and used wastefully material. And it has been considered to improve its proof stress against repeated loading of the products. Therefore we studied Forging process for satisfaction of these ability and process design for yoke forming has been studied by using FE analysis. Die design and forming analysis have been performed according to the conditions such as billet volume, flash control, cavity filling, and the distribution of damage in the products. In the comparison between die forging processes, side punch effects has been investigated by considering billet dimensions.
A Study on Thermal Analysis of Motorcycle Brake Disk
Ryu, Mi-Ra ; Kim, Young-Hee ; Byon, Sang-Min ; Park, Heung-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 34~40
The effect of frictional factors on thermal stress and deformation volume of motorcycle brake disk was studied by using a disk-on-pad type friction tester. It has an effect on the frictional factor such as applied load, sliding speed, sliding distance and number of ventilated disk hole. However, it is difficult to know the mutual relation of these factors. In this study, thermal stress and deformation volume by using design of experiment with 4 elements were investigated for thermal analysis with regression analysis. Thermal stress and thermal deformation are obtained by the application of temperature from mechanical test. From this study, the result showed that the motorcycle brake disk with ventilated hole 3 had the most excellent thermal stress and deformation volume. The regression equation had a trust rate of 95% for the prediction of thermal stress and deformation volume of motorcycle brake disk was composed.
The Evaluation of Machining Accuracy and the Machine Simulation for Parallel Kinematic Machine Tool(PKMT)
Shin, Hyeuk ; Ryou, Han-Sik ; Ko, Hae-Ju ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 41~47
This research deals with evaluation of machining accuracy for Parallel Kinematic Machine Tool(PKMT) applied parallel type robot system with high precision and stiffness. For this purpose, machine simulation is carried out to foreknow collision and interference between workpiece and tool. Furthermore, on the basis of machine simulation data, PKMT is manufactured. Machining accuracy such as cylindricity straightness, squareness, parallelism circularity, concentricity pitch error and yaw error, is measured by using coordinate measuring machine. Test piece for evaluation of machining accuracy is designed and manufactured under the standard of ISO 10791-7.
Optimal Cutting Conditions of Surface Roughness for Inconel 718 Alloy in Turning Operation
Park, Jong-Min ; Choi, Won-Sik ; Kwon, Soon-Hong ; Cha, Jin-Hoon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 48~53
Inconel 718 alloy, widely used as material of aircraft engine, has a good mechanical property in high temperature, strong anti-oxidation characteristics in oxidated current over
, and also is not easily digested in the air containing sulfur, therefore, its usage as mechanical component is expanding rapidly. Even though Inconel alloy 718 is difficult to machine, it requires highly precise processing/machining to sustain its component quality of high accuracy. In this paper, general turning operation conditions are tested to select the best cutting process condition by measuring surface roughness through implementing experiments with orthogonal array of cutting speed, feeding speed and cutting depth as processing parameters based on the Taguchi method. Optimal turning operation conditions are extracted from the proposed experimental models.
Shape Design of an Outer Tie Rod, Considering Durability Criteria
Kim, Jong-Kyu ; Kwon, Young-Min ; Park, Young-Chul ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 54~60
Weight reduction of automobile parts has been sought to achieve fuel efficiency and energy conservation. In this study, a shape design procedure is suggested to obtained the lightweight design of an outer tie rod. The developed aluminium Al6082M is selected as a steel-substitute material. Strength assesment and durability are the important design criterion in the structural design of an outer tie rod. This study considers strength and durability in the optimization process. In this study, the kriging interpolation method and trial and error method are adopted to obtain the minimum weight satisfying the strength and durability constraints.
Study on CFD Analysis of Dying Plant with Rotary Kiln Type for Eco-Industrial Park
Kang, Woo-Jung ; Hwang, Joon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 61~68
This paper presents the numerical analysis of process of sludge drying to know the characteristics of design parameters and develop the new process plant. Finite volume method and k-
turbulence model were used to analogy the sludge drying furnace. It has been attempted to perform the disposal of sewage sludge such as simple reclaiming and dumping in sea and incineration. Currently, these methods are restricted by national or international government regulations. The drying process is adopted as an effective method for sewage sludge treatment. However sewage sludge makes it difficult to treat with a large volume at the real drying process plant because of its own complicated physical, chemical, and thermal properties. The final design value of moisture content with 10% of the dried sludge can be obtained through the simulated outputs in this study.
Structural Design of a Front Lower Control Arm Considering Durability
Park, Han-Seok ; Kim, Jong-Gyu ; Seo, Sun-Min ; Lee, Kwon-Hee ; Park, Young-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 69~75
Recently developed automotive components are getting lighter providing a higher fuel efficiency and performance. Following the current trend, this study proposes a structural optimization method for the lower control arm installed at the front side of a Vehicle. Lightweight design of lower control arm can be achieved through design and material technology. In this research, the shape of lower control arm was determined by applying the optimization technology and aluminum was selected as a steel-substitute material. Strength performance is the most important design requirement in the structural design of a control arm. This study considers the static strength in the optimization process. For the optimum design, the durability analysis is performed to predict its fatigue life. In this study, the kriging interpolation method is adopted to obtain the minimum weight satisfying the strength constraint. Optimum designs are obtained by the in-house program, EXCEL-Kriging. Also, based on the optimum model obtained for the static strength, the optimization of Index of Fatigue Durability is carried out to get th optimum fatigue performance.
Investigation of Surface Roughness Characteristics according to Tool Runout Variations in Side Milling Cutter for Worm Screw
Kim, Sun-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 76~82
A worm screw is widely used in a geared motor unit for motion conversion from rotation to linear motion. For mass production of a high quality worm, the current roll forming process is substituted with the milling cutter process. Since the milling cutter process enables the integration of all machining operations of worm manufacturing on a CNC(Computer Numerical Control) lathe, productivity can be remarkably improved. The tooling system for side milling cutter on the CNC lathe to improve machinability is developed. However, the runout of spindle and cutting tips are important factors to be considered for producing high quality worms because the tooling system has multiple tips. In this study, surface roughness variations accuracy according to runout was investigated in side milling cutter for worm screw. The result shows by simulation and experiment.
A Study on Thermal Performance of Cooling System for a Laptop Computer Using a Cold Plate
Park, Sang-Hee ; Cho, Nam-Hea ; Choi, Sung-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 83~89
This study investigates two-phase cooling system of close-loop by using FC-72 and PCM(Phase change material). The cooling system consists of evaporator, cold plate, micro pump, and condenser. The heat input on the performance of evaporator is appreciated by visualizing the boiling on the evaporator. The heat performance of cooling system is investigated to determine the effects of volume fill ratio change at working fluid, pump flow rate change, and volume fill ratio change at PCM in cold plate. Experimental results show the ideal condition when the volume ratio of working fluid, the pump flowing, and the volume ratio of PCM are 60%, 6ml/min, and 60% respectively.
Effect of Stress Ratio on Fatigue Crack Growth in Mixed Mode(I+II)
Gong, Byeong-Chae ; Choi, Myoung-Su ; Kwon, Hyun-Kyu ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 90~96
The loading condition of actual construction works is complex. The shear effect of mixed-mode load component are crack propagation mechanism in step larger than the crack initial mechanism. Therefore, in this study received a mixed-mode loading on fatigue crack stress ratio on crack propagation path and speed of progress to learn whether stress affects crack propagation.
P a constant state of fatigue tests in Mode I, II give the same stress ratio, frequency 10Hz, sinusoidal waveform was used. A lower stress ratio fatigue crack propagation angle is small. This is less affected by the Mode II. Therefore, a mixed-mode fatigue crack propagation is to progress by the Mode. Stress ratio in a mixed mode crack in the path of progress and found a lot of impact.
A study on torque measuring technique for track drive unit of earthmoving equipment with very large capacity
Lee, Yong-Bum ; Han, Seung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 97~103
Since a demand for an extensive range of earthmoving equipment like a hydraulic excavator with a capacity of 85tons has been asked in construction fields, a performance of its track drive unit has to be verified experimentally. Among the verification of the performances, a torque measurement is at issue, in which a torque meter is utilized widely. However, the very large scaled torque meter is necessary when a discharged torque from the track drive unit is increased significantly. In addition, the price for experimental set-up of a torque meter is too high due to its limitation of the geometry such as long length, and a break down in operation occurs frequently. In this study, to measure a high torque up to 200,000Nm, a new technique was proposed as an alternative of conventional measurement by using a torque meter. The new technique enables to measure the high torque stably in a compact space via a torque arm and two load cells. The experimental results showed a propriety of the proposed torque measuring technique for a track drive unit with very large capacity.
Basic Study on the Nonocomposites by using the MWNT(Multiwalled Nanotube)
Kang, Young-Gu ; Kweon, Hyun-Kyu ; Choi, Seong-Dae ; Noh, In-Gyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 104~109
In this paper, polymer nanocomposites were fabricated by mixing fire-resistant and high pseudoplastic Nylon 6,6 with MWNT(Multiwalled Nanotube), which has mechanical, electrical, and heat stable properties. The experiments were performed in order to investigate their mechanical and electrical properties depending on the level of MWNT and the presence of acid treatment on Nylon 6.6. Morphology of polymer nanocomposites was observed using Scanning Electron Microscopy technique. The results indicate that the polymer nanocomposites have the best mechanical and electrical properties in the optimal conditions of Nylon 6.6 and MWNT(10wt%).
Application of Operating Window to Robust Process Optimization of Sheet Metal Forming
Kim, Kyung-Mo ; Yin, Jeong-Je ; Suh, Yong-S. ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 110~121
It is essential to embed product quality in the design process to win the global competition. Many components found in many products including automobiles and electronic devices are fabricated using sheet metal forming processes. Wrinkle and fracture are two types of defects frequently found in the sheet metal forming process. Reducing such defects is a hard problem as they are affected by many uncontrollable factors. Attempts to solve the problem based on traditional deterministic optimization theories are often led to failures. Furthermore, the wrinkle and fracture are conflicting defects in such a way that reducing one defect leads to increasing the other. Hence, it is a difficult task to reduce both of them at the same time. In this research, a new design method for reducing the rates of conflicting defects under uncontrollable factors is presented by using operating window and a sequential search procedure. A new SN ratio is proposed to overcome the problems of a traditional SN ratio used in the operating window technique. The method is applied to optimizing the robust design of a sheet metal forming process. To show the effectiveness of the proposed method, a comparison is made between the traditional and the proposed methods using simulation software, applied to a design of particular sheet metal forming process problem. The results show that the proposed method always gives a more robust design that is less sensitive to noises than the traditional method.
A Study on the Friction and Wear Characteristics of Cr-interrelatedness & WC/C Coating SCM4l5 Steel
Jang, Jeong-Hwan ; Kim, Hae-Ji ; Kim, Nam-Kyung ; Zang, Qi ; Ryu, Seong-Gi ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 122~128
The purpose of this study is to show the friction and wear characteristics on the vapor deposited coating layers on the SCM415 steel. In this research, frictional wear characteristic of coating materials such as CrN, AlCrN, WC/C was investigated under room temperature, normal air pressure and nothing lubricating condition. Therefore this study carried out research on the friction coefficient, micro hardness(Hv), roughness, EPMA on the vapor deposited coating layers on the SCM415 steel.
FEM Based Approach to Predict Rolling Force and Strip Thickness in 4- High Cold Rolling Mill Driven by Backup-Roll
Lee, Jae-Hyun ; Byon, Sang-Min ; Park, Heung-Slk ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 129~135
In this paper, a finite element model is presented for the prediction of roll force and strip thickness in a backup-roll-drive mill. The proposed FE model is focused mainly on analyzing the elastic/plastic behavior between a work roll and a strip as well as the rigid/plastic behavior between a backup roll and a work roll. The capability of the proposed model is demonstrated through application to 4-high silicon steel rolling mill at POSCO. Results show that the predicted roll force and strip thickness rolled accurately agree with the measured them. It is also illustrated that the proper position of work roll displaced to one side from the vertical centerline of the backup-roll may be determined by minimizing the horizontal force of work roll.
A study on structure analysis and material improvement lightweight of special-purpose vehicles axle
Lee, Jung-Hwa ; Kwon, Hui-June ; Kang, Jung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 8, issue 4, 2009, Pages 136~142
The vehicle's light-weight technology is divided into optimization of structure geometric and material. Structure geometric optimization and improvement of materials has examined to be power-train and maintenance on the severe condition. The core technology of Special vehicle's light-weight is constitute by Drop box, Axle and Final reduction gear. Technology and product of the parts is high to overseas and import dependency. We will want to examine the possibility of light-weight for the Axle Case and Drop box-connections. In this research, conventional design of excess weight will inhibit the mobility and fuel efficiency. Through the improvement of Axle material, we saw the possibility reducing weight. If you use the results of these studies, it will be available to domestic production technology and reducing weight of RV car, Dump truck, Track crain, etc.