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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
Journal Basic Information
Journal DOI :
The Korean Society of Manufacturing Process Engineers
Editor in Chief :
Volume & Issues
Volume 12, Issue 6 - Dec 2013
Volume 12, Issue 5 - Oct 2013
Volume 12, Issue 4 - Aug 2013
Volume 12, Issue 3 - Jun 2013
Volume 12, Issue 2 - Apr 2013
Volume 12, Issue 1 - Feb 2013
Selecting the target year
Simulation on the powder Compression Forming of Oilless Bearing Using Finite Element Analysis
Park, Min-Hyeok ; Kang, Han-Bin ; Song, Ju-Han ; Pack, In-Seok ; Lee, Dong-Ug ; Kim, Duk-Joo ; Lee, Seok-Soon ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 1~7
In this study, simulation on the powder compression forming of oilless bearing is performed and the analysis results are compared with the actual products. This study aims to examine the suitability of powder compression for bearing by using FEA(finite element analysis) before full-scale production. The lubrication state can be predicted by changing the coefficient of friction in order to get the optimal density gradient. Analysis for single and double action presses are performed and these results are compared with each other. State and process of optimal lubrication are proposed from the study result.
Study on Fatigue Durability Analysis of Poclain Bucket
Han, Moon-Sik ; Cho, Jae-Ung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 8~13
This study analyzes about poclain bucket through fatigue durability analysis. Maximum equivalent stress and total deformation are shown at the lower of bucket and edge part respectively. 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 -10000Pa to 5000MPa and the amplitude stress of 0 to 6000MPa, the possibility of maximum damage becomes 3%. This stress state can be shown with 5 or 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 poclain bucket by investigating prevention and durability against fatigue damage.
A Study on the Residual Stress Analysis of a-Si Thin Film Solar Cell
Hur, Jang-Wook ; Kim, Dong-Wook ; Choi, Sung-Dae ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 14~19
The size and distribution of residual stresses and the effect of the minimum mesh size were investigated by the a-Si thin film solar cell. Attributed to the difference in coefficient of thermal expansion of the a-Si and Ag concentrated residual stresses at the joint interface of dissimilar materials. The
didn't appear in the central part, but
appeared in the edge part and concentrated residual stresses at the interface between a-Si and Ag. Minimum mesh size gets smaller, the concentration of
was significantly and existence area was reduced. As a result, the failure of thin film solar cells during the cutting process can be explained by the residual stresses.
Effect of Cutting off Processing SCM415 on Surface Roughness and Thickness of Materials
Kim, Jin-Su ; Kang, Seong-Ki ; Shin, Mi-Jung ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 20~26
This study focused on how it affects the surface roughness of work piece in cutting SCM415 steel, widely used steel in industry, by TiCN and TiN tools. Following conclusion was drawn from several experiments. The surface roughness of heat treated workpiece was better than that of non heat-treated materials. Moreover, the roughness of surface roughness(Ra 0.25) on feeding rate of 0.05 was better when it was in wet process, rather than dry process. As the feeding rate increases, TiCN coating tool shows better roughness of surface than TiN tool. Also, in heated treatment, TiCN coating tool shows the least straightness dimension deviation at feeding rate of 0.05, 0.15mm/rev, and concave-like R shape appears by the feeding rate orders of 0.05, 0.15, 0.1, 0.125 and 0.075mm/rev.
On-Road Driving Performance Analysis of Diesel-Hybrid Bus in Daegu Metropolitan Area
Kim, Hyunjun ; Chun, Bongsu ; Han, Manbae ; Han, Moonsik ; Kim, Yongrae ; Lee, Yonggyu ; Choi, Kyonam ; Jeong, Dongsoo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 27~33
In this study we analyzed the on-road driving performance of two parallel-type diesel-hybrid buses which have been driven in Daegu metropolitan area. A real-time on-board data logger was facilitated to measure the vehicle information such as vehicle speed, idle stop, state of charge of battery, and engine operating conditions. These diesel-hybrid buses ran as a commuter at Daegu Exco area and Dalsung industrial complex. The driving pattern in Exco area comprised more frequent idle stop and relatively lower speed than at Dalsung area, where comprised no idle stop. Due to those different driving patterns, the fuel economy at Dalsung showed
, which is about 8% higher than that of Exco. The main causes of this come from the higher portion of regenerative braking and higher speed which moves to the operating points of diesel engine with a lower fuel consumption.
Characteristic of Nitrogen doped Diamond-Like Carbon film on the Silicon substrates
Nguyen, Van Cao ; Kim, Tae Hyeon ; Kim, Hye Sung ; Shin, Dong Chul ; Kim, Tae Gyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 34~40
Various depositional conditions, such as substrate, pressure, deposition time, temperature of substrate, power and gas composition, have mainly been studied to attain DLC films using RF sputtering system up to the current. In this study, the
gas mixture factored on characteristics of DLC deposited film such as structure, hardness, electrical property were investigated. The concentration of the
gas in the sputtering gas may be a significant effect on the growth rate of the doped films, because nitrogen ions react not only with the carbon atoms on the target but also with
ions in the plasma on the substrate surface. It was seen from this experimental that the resistance of deposited film is decreased, and the relative intensity ratio of D to G peak is increased as nitrogen content of film deposition is increased.
Robust Design of Springback in Sheet Metal Forming
Kim, Kyung-Mo ; Yin, Jeong-Je ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 41~48
Springback is a very typical dimensional discrepancy phenomenon, which occurs usually on the final stamping parts after the tool loading is removed. Variation of springback leads to amplified variations and problems during assembly of the stamped components, in turn, resulting in quality issues. The variations in the properties of the incoming material and process parameters are the main causes of springback variation. In this research, a robust design methodology which combines orthogonal array based experimental design and design space reduction skim to reduce the springback variation for advanced high strength steel parts in sheet metal forming is suggested. The concept of design space reduction is adapted in the experimental design setup to improve the quality of the obtained solution. The effectiveness of the proposed procedures is illustrated through a robust design of springback in metal forming process of a cross member of auto body.
A Study on The Variation of Penetration According to The Shielding Gas in A1100 Aluminum Welding
Kim, Jin-Su ; Kim, Bub-Hun ; Kim, Gue-Tae ; Park, Yong-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 49~54
Recently welding of aluminum material is actively carried out to make lightweight in the fields of LNG vessels, aircraft, chemical plants, etc. To obtain high strength, hardness and elongation, elements such as manganese, zinc, silicon, etc should be added in aluminum alloy, which has been improved on the mechanical properties like precipitation hardening, age hardening, loosening, corrosion resistance acid resistance. Ar gas is used as a shielding gas of MIG welding for aluminum, also
etc can be added depending on the composition of the alloy. In this study, Ar +
, Ar, and He were used for welding, hardness, penetration status and changes in composition of penetrated parts were compared and analyzed. This made it possible to know the status and changes of the process in the penetrated parts depending on used gas throughout this study.
Design and Weldability Verification of the 40kHz Horn for Ultrasonic Metal Welding
Jang, Ho Su ; Park, Woo Yeol ; Park, Dong Sam ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 55~61
The horn is a key part of the ultrasonic welder. As the shape, mass and material of a horn have effects on the resonant frequency and the vibration mode in ultrasonic welding, a horn has to be designed and manufactured accurately. In this study, 40kHz band horn was designed and manufactured through the vibration mode and finite element analysis. A result of modal analysis showed that the natural frequency of the horn was 39,794Hz, and the frequency response by a harmonic response analysis was 39,800Hz - close to the intended frequency, 40kHz. In addition, weldability of the developed horn was estimated by welding of two Ni sheets and tensile-shear test of welded samples. It was shown the developed horn could be used in metal sheet welding.
A Study on the Deposition Conditions on Joint Strength of Polyimide Substrate and ZnO Thin Film
Hur, Jang-Wook ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 62~67
The influence of internal stress and joint strength(shear, tensile) according to the deposition conditions was investigated by the Polyimide substrate and ZnO thin film. Deposition thickness and temperature affect the internal stress and the internal stress was minimum at the 60nm and
of the deposition conditions. Tensile strength is large at the deposition condition that shear strength is large and the shear strength was about 50% of the tensile strength. The shear strength and tensile strength were large at deposition condition that internal stress was small. Crack occurred near the joint interface of Polyimide substrate and progressed along the interface until the final fracture.
Surface roughness model of end-milling surface
Chin, Do-Hun ; Kim, Jong-Do ; Yoon, Moon-Chul ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 68~74
In this paper, an average surface roughness,
, was measured by optical measurement and its mathematical model according to spindle speed and feedrate was obtained by least square method. Also, its result is compared and investigated with real measured average surface roughness. The optical measurement of surface roughness is performed by CLSM(confocal laser scanning microscope) and the captured HEI(height encoded image) data is used as an original data for the generation of average surface roughness and its mathematical plane or contour surface of surface roughness. Using this polynomial model with two independent variables, the behavior of an average surface roughness is investigated and analyzed with an experimental modeling of least square algorithm. And it can be used for the prediction of
in different condition of machining.
A Study on the Characteristics of Silicon Micro-hole machining
Chae, Seung-Su ; Lee, Sang-Min ; Park, Hwi-Keun ; Cho, Jun-Hyun ; Lee, Jong-Chan ; Heo, Chan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 75~80
Cathode is an essential component used in plasma etching process which is to make micro pattern on the silicon wafer. The currently used cathodes produce particles at the high temperature plasma etching process. To overcome this problem, a 'Silicon Only Cathode' was developed. This 'Silicon Only Cathode' requires manufacturing process changes due to the change of shapes, material features, and machining characteristics of work materials. This research investigates the small hole drilling process. The conclusion is that PCD drills with twist angles of
were tested for small hole drilling and the experimental results indicate that the drill with
twist angle drill causes less thrust force.
Multi-objective Optimization of Marine 3/2WAY Pneumatic Valve using Compromise Decision-Making Method
Kim, Jun-Oh ; Baek, Seok-Heum ; Kim, Tae-Woo ; Kang, Sangmo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 81~90
A study on the flow-structure characteristics of marine 3/2WAY pneumatic valve is essential for optimizing the performance of ship engines. It is important that the valve has desirable safety factor and reduced weight from safety and economic point of view. In this paper, flow-structure characteristics of pneumatic valve is obtained by being optimized based on the proper design criteria. The air with the pressure of 30 bar is the working fluid which is made to fill in the tack in short time. This time is defined as the filling time. On optimum design by considering the flow-structure characteristics, the approach is based on (1) the mathematical formulation of design decisions using the compromise decision-making method, and (2) the approximation technique of response surfaces. The methodology is demonstrated as the multi-objective optimization tool to improve the performance of marine 3/2WAY pneumatic valve.
Design and Analysis to aluminize Car Cross Beam for Small Passenger Car
Shin, Hyun-Woo ; Park, Joon-Gyu ; Kong, Moon-Kyu ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 91~99
Car cross beam made by aluminium for new car is designed for the substitution of steel and it can be verified the performance by computer simulations. The parts of car cross beam are designed to replace steel parts according to their manufacturing processes. At the first stage, the weight of the aluminium car cross beam can be reduced to 75% by comparing with that of steel car cross beam. But NVH performance of the aluminium car cross beam becomes slightly insufficient as compared with that of steel car cross beam. Taguchi method is adopted to optimize the design variables affecting NVH characteristics of car cross beam. New car cross beam is designed at the second stage by using these analysis results. Weight reduction can be obtained to 31.7% by design modification and material change of car cross beam in comparison with the original steel one. NVH characteristics of aluminium car cross beam become on an equal level with the steel car cross beam. By side impact analysis results, new car cross beam has higher performance as compared with the steel car cross beam.
Determination of Efficient Superfinishing Conditions for Mirror Surface Finishing of Stainless Steel
Kim, Sang-Kyu ; Cho, Young-Tae ; Jung, Yoon-Gyo ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 100~106
Stainless steel has some excellent properties as the material for the mechanical component. Purpose of this study is carried out to obtain mirror surface on the surperfinishing of stainless steel with high efficiency. To achieve this, we have conducted a series of polishing experiment for stainless steel using abrasive film from the perspective of oscillation speed, the rotational speed of workpiece, contact roller hardness, contact pressure and feed rate. Abrasive film used this study is a micro-finishing film and a lapping film. Furthermore, the polishing characteristics and efficiency of stainless steel is discussed through measuring optimal polishing time and surface roughness. From the obtained results, it was confirmed that efficient superfinishing conditions and polishing characteristic of Stainless steel can be determined.
A Study on the Thermal Effects Measurement and Uncertainty Estimation for High Precision Machine Tools
Son, Deok-Soo ; Kim, Sang-Hwa ; Park, Il-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 107~113
When the main spindle of high precision machine tools are run many hours, heat is generated in bearing parts of the inside of the spindle. Also, headstock is appeared distortion by inside and outside temperature difference of a machine. This paper studies method to measure behavior of machine tool about these thermal effects. In addition, it estimates measurement uncertainty factors which can be appeared in thermal effects measurement. Finding the factor of thermal affect measurement is important for estimation of measurement uncertainty. This paper measures thermal effects of high precision machine tools and evaluates the important factors of uncertainty.
Application and Parameter Optimization of EP-MAP Hybrid Machining for Micro Pattern Deburring
Lee, Sung-Ho ; Kwak, Jae-Seob ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 114~120
An EP(Electrolytic Polishing)-MAP(Magnetic Abrasive Polishing) hybrid process was applied to remove burr on the micro pattern. Micro pattern fabrication processes are combined with micro milling and EP-MAP hybrid process for deburring. Depending on the micro milling conditions which are applied, micro burrs are formed around the side and top of the pattern. The EP-MAP deburring is used to remove these burrs effectively. To optimize removal rate and form error in the EP-MAP hybrid process, a design of experiment was performed. The effect of deburring process and form error of micro pattern are evaluated via SEM images and the results of AFM.
A Study on the Machining Accuracy according to Vibration and Unbalance Decrease in Rotational Speed Domains of High Precision Machine Tools
Son, Deok-Soo ; Kim, Sang-Hwa ; Park, Il-Hwan ;
Journal of the Korean Society of Manufacturing Process Engineers, volume 12, issue 2, 2013, Pages 121~126
Precision machine tools for high dignity cutting are needed for efforts to improve machining accuracy. However, there are many factors to improve machining accuracy. This study investigated how machining accuracy changes when variation and unbalance amount in rotational speed domain is decreased. Machining accuracy of initial machine tools depends on manufacturing and assembly of parts such as bearing. And then, vibration and noise vary with volume of unbalance amount when it is rotation, so it effects unbalance amount. Also vibration and noise increased by unbalance shorten spindle's life and it especially makes worse boring accuracy. Therefore, this study studied the change of roundness and cylindricity of workpiece when it decreases variation and unbalance in rotational speed domain.