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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
Analytical Prediction of Bearing Life and Load Distribution for 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 5, 2012, Pages 1~7
The transportation is almost dependent on a single fuel petroleum with transportation energy dilemma. Hybrid Electric Vehicle(HEV) technology holds more advantages on efficiency improvements for petroleum consumption at the transportation. And bearing is recognized as the important component of gearbox. Gearboxes for HEV transmission have been ensured the highest reliability over some years in withstanding high dynamic loads. At the same time, the demands of lightweight design and cost minimization are required by thought-out design, high-quality material, superior production quality and maintenance. In order to design a reliable and lightweight gearbox, it is necessary to analyze bearing rating life methods between standard and different bearing companies with calculation methods for modification factors. In this paper, the influence of life time of bearings will be pointed out. Bearing contact stress and load stress distribution of HEV gearbox are obtained and compared with Romaxdesigner and BearinX. And the unequal wear of the left bearing for the gearbox intermediate shaft is investigated between simulation and test.
The Study on Interrupted Cutting Tool Life of Cermet and CBN in Ductile Cast Iron(FCD500)
Oh, Sung-Hoon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 8~12
Recently, a wide range of industrial production area has a competitive advantage through cost reduction. Moreover with the development of industrial technology, base material and cutting tool help the machining technology. But most of the machining enterprises have not hold the R&D facilities and human resources. This mainly disturbs the industrial development and th increase of production efficiency. Especially in the interrupted machining process, it showed different behavior with continuous machining process. So it needs to research and develop the tool life and tool wear mechanism analysis.
Fracture Mechanic's Approach on Retardation Behaviors under Overloading
Kang, Yong-Goo ; Park, Jun-Young ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 13~20
In order to clarify the effect of overload on crack growth behaviors, fatigue tests for overload were carried out for round plain specimens of SM45C steel. In the experiment, typical semi-elliptical crack shape was found and further crack growth behaviors were tested. Using three types of single overload fatigue tests, Crack growth retardation phenomenon were examined. The growth rate of surface crack(da/dN) during retardation period was analyzed in terms of
. On the growth rate of surface crack analyzed by
, the dependence of overload stress levels appears. However, on the growth rate by
obtained by Willenborg analysis, there is a non-liner relationship between da/dN and
with narrow scatter band.
Structural Analysis on Tension Bearing of Automotive Engine
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 21~28
This study analyzes about automotive engine tension bearing through the structural analyses of fatigue and vibration. Maximum equivalent stress is shown at the lower of tensioner. 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
, 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 tension bearing by investigating prevention and durability against its damage.
Selection of the Optimal Machining Condition for a High-hardness Resin using the 5-axis Machine
Kim, Nam-Hun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 29~34
This study describes the selection of optimum machining conditions for a high-hardness resin by using a large 5-axis machine. The experiments were conducted to examine the main factors that affect the surface roughness, such as the spindle speed, axial and radial depths of the cut, and pattern of the cutter path. To analyze the experiment results, the factor with the biggest impact on machining was determined using the smaller-the-better characteristic of the Taguchi method; the effectiveness of the experiment was then confirmed by verifying the selected optimum machining condition.
Performance Evaluation of Vane Motor Driven by Monopropellant
Hong, Deuk-Eui ; Ryu, Ga-Ram ; Han, Seung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 35~41
Liquified hydrogen peroxide as a monopropellant is drawing an attention as a power generating energy source for a machine requiring simple and light weight structure. The liquified hydrogen peroxide is attracted due to its outstanding applicability because it doesn't require an oxidizer and discharge a hazardous product. For the further industrial applications, however, a feasibility study should be carried out carefully in the aspect of the specific power density. In this study, a prototype of vane motor driven by the liquified hydrogen peroxide with high density of upper 95% was developed and its performance characteristic such as a specific power density was estimated via measuring pressure and rotation speed of the vane motor. The specific power density obtained by numerical simulation using FSI analysis supported by experimental results was up to
, which reaches at the level of the latest developed fuel cell.
Tooth Modification for Spur Gear for Articulated Hauler's Final Drive
Oh, Sew-Oong ; Zhang, Qi ; Lee, In-Bum ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 42~47
Construction equipment is heavily loaded during normal operation. In recent years, there is a trend that lower gear noise levels are demanded for drivers to avoid annoyance and fatigue during operation. For articulated hauler's final drive, meshing transmission error(T.E.) is the excitation that leads 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 the tooth profile modification, and the prediction of transmission error under the loaded torques for the spur gear pair of the articulated hauler's final drive. And the transmission error, transmission error harmonics and contact stress are also calculated and compared before and after tooth modification under one torque. The simulation result shows that the transmission error and contact stress under the loads can be minimized by the appropriate tooth profile modification.
Design of Non-linear Observer to Estimate Yaw Rate and Sidel Slip Angle
Song, Jeong-Hoon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 48~53
A non-linear vehicle model and an observer are designed to observe the yaw rate and the body side slip angle when a vehicle is turning maneuver in this study. The developed vehicle model is a full car model and has fourteen degree of freedom. A Luenberg observer is applied to develop the observer. The vehicle model is validated with a reference result and shows good accordance. The observer is tested on dry asphalt, wet asphalt and snow paved road. The results prove the performance of observer is robust and reliable.
A Study on Effect of the Grinding in SCM420H Planetary Gear
An, In-Hyo ; Hur, Nam-Soo ; Lee, In-Bum ; Lyu, Sung-Ki ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 54~59
This study dealt with effect of the grinding in SCM420H planetary gears. The hardness, tooth profile, lead and roughness of the gear surface can be improved by grinding process. Therein, the grinding techniques are widely used especially as one of the physical surface improvement methods. As the results, the gear grinding process reduced vibration and noise, and increased the life of the gear. And the gear grinding improved the surface of gear tooth in a short time and low cost, thus, it is a very important process in manufacturing industry. But nowadays, it is hard to find the detail information of gear grinding process. The test piece is a planetary gear which is used in the industrial machine. The manufacture process of the test piece contains hobbing, shaving, carburizing and grinding. This study investigated the effect of the grinding process to the physiognomy and the fatigue strength of test piece which was made by SCM420H.
A Study on the Machining Characteristics of Prototype of Roller Gear Cams
Kim, Jin-Su ; Kang, Seong-Ki ; Lee, Dong-Seop ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 60~67
In the study, the effect grinding condition on the workpiece arithmetical average roughness(Ra) to 10 steps leading to cutting each section with the spindle rotational speed 8000rpm and feed rate 150mm/min of grinding in GC(green silicon carbide) grinding processing after heat treatment and non heat treatment of SCM415 material. Also the following conclusions were obtained analysis of stress distribution displacement and finite elements method(FEM) on assemble parts with 3+2 axis simultaneous control through grinding and gave a load 11kg on ATC arm both sides gave a load of 11kg. For the centerline average roughness(Ra) in the heat and non-heat treatment work pieces, which were appeared the most favorable in the fifth section were
, that were shown in the near the straight line section was the smallest deformation of curve. In addition, the bad surface roughness appeared on the path is too long by changing angle, the more inclined depth of cut, because the chip discharging is not smoothly.
Structural Durability Analysis of Tie Rod
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 68~75
This study aims at the structural analysis of vibration and fatigue according to the tie rod configuration. The maximum displacement amplitude is happened at 156Hz by harmonic vibration analysis, this tie rod model can be broken as the weakest state. Among the cases of nonuniform fatigue loads, 'SAE bracket history' with the severest change of load becomes most unstable but 'Sine wave' becomes most stable. In case of 'Sine wave' with the average stress of 0MPa and the amplitude stress of 570MPa, the possibility of maximum damage becomes 70%. This stress state can be shown with 140 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 on tie rod by investigating prevention and durability against its damage.
Experimental Investigation on Machining Feasibility of Micro Patterns using a Single Crystal Diamond Tool
Kim, Hyun-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 76~81
The continuing demand for increasingly slimmer and brighter liquid crystal display(LCD) panels has led to an increased focus on the role of the light guide panels(LGPs) or optical films that are used to obtain diffuse, uniform light from the backlight unit(BLU). And the most basic process in the production of such BLU components is the micromachining. LCD BLUs comprise various optical elements such as a LGP, diffuser sheet, prism sheet, and protector sheet with micro patterns. High aspect ratio patterns are required to reduce the number of sheets and enhance light efficiency, but there is a limit to the aspect ratio achievable for a given material and cutting tool. Therefore, this study comprised a series of experimental evaluations conducted to determine the machining feasibility in microcutting various aspect ratio patterns on electroless nickel plated die materials when using single-crystal diamond tools. Cutting performance was evaluated at various cutting speeds and depths of cut using different machining methods and machine tools.
Structural Performance Test of Optimized Outer Tie Rod
Kim, Jong-Kyu ; Seo, Sun-Min ; Kim, Young-Jun ; Lee, Dong-Jin ; Lee, Seul ; Park, Young-Chul ; Lee, Kwon-Hee ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 82~87
The outer tie rod that is a part of steering system connects the steering gear to the steering knuckle via the inner tie rod. The formal study suggested the optimized structural design of an outer tie rod installed in a passenger car. Its weight is 284.7g, which is 57.2% lighter weight than initial steel model. This study validates the optimized design of the outer tie rod considering buckling and durability. The assembled unit of an inner tie rod and outer tie rod is utilized to perform the test of the bending strength of the outer tie rod. On the contrary, 1/2 car is utilized to perform the test of its durability performance.
Improvement of the ED-Drilling Machinability using Multi-hole Electrodes
Kim, Chang-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 88~93
This paper describes the machinability of the sintered carbide and tool-die steel(STD-11) by electric discharge drilling with various tubular electrodes which have multi-holes. Various types of electrode which have different diameters and materials are used with the application of continuous direct current and axial electrode feed. Inner part of electrodes are inserted with smaller tubes or Y-channel or bar. In ED-Drilling, the dielectric flushed down the interior of the rotating tube electrode, in order to remove machining debris from the hole. As result of experiments, the bigger the diameter of the electrode is, the lower the material removal rate is. Machinability of copper electrode is higher than that of brass. In machining of sintered carbide, to use oil is better than distilled water as dielectric.
Position Control System using Neural Network Algorithm for Butterfly Valve
Choi, Jeong-Ju ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 94~98
Butterfly valves are usually used by the plumbing systems in plant engineering field. Valves are used for controlling the flow rate and pressure of fluid. In order to control the flow rate using butterfly valve, the position control of valve disc should be designed. However, since there are lots of uncertain disturbance in plumbing system, the robust control system should be considered. Therefore, the sliding mode control system using neural network algorithm is proposed in this paper. The proposed control system provides the estimating method using neural network for the unmeasurable disturbance in the plumbing system. The performance of the proposed control system is evaluated through computer simulations.
The Experimental Study in the Micro Drilling of Excimer Laser on Pyrex Glass
Lee, Chul-Jae ; Kim, Ha-Na ; Jeong, Yun-Sang ; Jun, Chan-Bong ; Park, Young-Chul ; Kang, Jung-Ho ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 99~103
Presently, A glass is widely used in telecommunication system, optoelectronic devices and micro electro mechanical systems. Micro drilling of glass using the laser can save processing cost and improve the accuracy. This paper experiments micro drilling using KrF excimer laser on the pyrex glass of
thickness. We have experiment to find out optimum laser machining conditions of micro drilling of glass and ablation depth and influence by processing parameter suc'h pulse repetition rate, energy density and number of pulses. Pulse repetition rate don't influence ablation depth at the micro drilling of pyrex glass. Energy density influence micro drilling of parallelism and maximum thickness that can be drilled. Ablation depth is most influenced by number of pulses.
Experiments on Efficiency of Standing Type Waterwheel with Narrow Canal for Micro/Small Scale Hydro Power Plant
Kim, Dong-Jin ; Lee, Kyong-Ho ; Ahn, Kook-Chan ; Kim, Bong-Hwan ; Lee, Chi-Woo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 104~108
Recently, small scale hydropower needs to be developed due to its clean, renewable and abundant energy resources. However, suitable draft of hydro-turbine body in combination with differences in wheel blade shapes is not determined yet in the range of small hydropower and it is necessary to study for the effective draft in combination with type. Therefore, watermill shaped of 250mm diameter. hydro-turbine aiming 20 watt class generator is adopted in this study because of its simple structure and high possibility of applying to small hydropower. The result shows that effective draft for the turbine body is variable concerning the size of turbine and flow rate of water. Thus, the difference of water depth between fore and aft turbine body contributes to the increase of torque, angular momentum and power output.
A Study on Combustion Characteristics using Forced Pulsating Flow
Yang, Young-Joon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 109~114
The combustion characteristics using forced pulsating flow were experimentally investigated with confined premixed flames stabilized by a reward-facing step. The intermittent combustion has many merits, for instance, such as high load combustion, high heat transfer, low emission gas, compared with those of continuous combustion. For these purposes, data processing of binary image was conducted to reveal the differences between intermittent and continuous combustion. As the results, it was possible to calculate the reaction zone using OH-emission band and, therefore, showed that forced pulsating flow was useful in combustion technology.
Effect of Metals used in Orthopedic on Magnetic Resonance Imaging II
Kim, Hyeong-Gyun ; Choi, Seong-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 115~120
Metals used orthopedic in human magnetic resonance imaging scan of the metal to be inserted, The information to users about the image distortion is to propose a basis for judgment. Metals used orthopedic on Stainless, Titanium and Clip using ferromagnetic artifacts and distortion of the image were measured. Using Phantom "Effect of Metals used in Orthopedic on Magnetic Resonance ImagingI" pig in a paper subsequently was carried out using the same bone. Experimental results using a pure Titanium is a relatively high diagnostic value was found that.
A Simulation-based Optimization of Design Parameters for Cooling System of Injection Mold by using ANOVA with Orthogonal Array
Park, Jong-Cheon ; Shin, Seung-Min ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 121~128
The optimization of cooling system parameters for designing injection mold is very important to acquire the highest part quality. In this paper, the integration of computer simulations of injection molding and Analysis of Variance(ANOVA) with orthogonal array was used as a design tool to optimize the cooling system parameters aimed at minimizing the part warpage. The design optimizer was applied to find the optimum levels of cooling system parameters for a dustpan. This optimization resulted in more uniform temperature distribution over the part and significant reduction of a part warpage, showing the capability of present method as an effective design tool. The whole optimization process was performed systematically in a proper number of cooling simulations. The design optimizer can be utilized effectively in the industry practice for designing mold cooling system with less cost and time.
Study of Weld Part Status Change by
Welding According to the Variation of Gas Composition and Welding Wire on SS400 Material
Kim, Bub-Hun ; Kim, Won-Il ; Choi, Chang ; Park, Yong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 129~136
On this study,
gas, net of Ar gas, and mixed gas in solid wire(AWS ER 70S-6) and flux cored wire(AWS E71T-1) were used to weld on Mild steel(SS400). After the progress, the status changes of the welds in Mild steel(SS400) were investigated with compositional changes. For stable experiments, welding was conducted using the automatic feeder. Radiation testing, hardness testing, chemical composition analysis and penetrated cross-section were measured. Through these experiments, shapes of penetrated cross-section, chemical composition changes, and weld defects according to the variation of welding gas were known. Weld defects and weld cross-sectional shapes by the variation of the welding voltage were also detected.
A Study on Surface Corrosion of Compressed Chip of Al-lithium Alloy according to the Packing Method
Lee, In-Su ; Kim, Hae-Ji ; Kim, Deok-Hyun ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 137~141
In order to increase recyclability of new material, aluminium-lithium alloy(Al2050-T84), the chip is compressed in the type of cylinder after machining. This study is to review the effect of environmental condition such as temperature change and salt during the transportation by sea on the corrosion at the surface and inside of the compressed chip, and an effective packing method is presented in this paper.
Tool Monitoring System using Vision System with Minimizing External Condition
Kim, Sun-Ho ; Baek, Woon-Bo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 11, issue 5, 2012, Pages 142~147
Machining tool conditions directly affect to quality of product and productivity of manufacturing. Many researches performed for tool condition monitoring in machining process to improve quality and productivity. Conventional methods use characteristics of signal for cutting force, motor current consumption, vibration of machine tools and machining sound. Recently, diameter of machining tool is become smaller for minimizing of mechanical parts. Tool condition monitoring using conventional methods are relatively difficult because micro machining using small diameter tool has low machining load and high cutting speed. These days, the direct monitoring for tool conditions using vision system is performed actively. But, vision system is affected by external conditions such as back ground of image and illumination. In this study, minimizing technology of external conditions using distribution analysis of image data are developed in micro machining using small diameter drill and tap. The image data is gathered from vision system. Several sets of experiment results are performed to verify the characteristics of the proposed machining technology.