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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of The Korean Society of Manufacturing Technology Engineers
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Journal DOI :
The Korean Society of Manufacturing Technology Engineers
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Volume & Issues
Volume 18, Issue 6 - Dec 2009
Volume 18, Issue 5 - Oct 2009
Volume 18, Issue 4 - Aug 2009
Volume 18, Issue 3 - Jun 2009
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Ecology 융합형 절삭공구 기술의 현황과 전망
Gang, Jae-Hun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 5~9
The Machining Characteristics of Groove Patterning for Nitinol Shape Memory Alloy Using Electrochemical Machining
Shin, Tae-Hee ; Kim, Baek-Kyoum ; Baek, Seung-Yub ; Lee, Eun-Sang ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 551~557
A development of smart materials is becoming a prominent issue on present industries. A smart material, included in functions, is needed for micro fabrication. A shape memory alloy(SMA) in a smart material is best known material. Ni-Ti alloy, composed of nikel and titanium is one of the best shape memory alloy(SMA). Nitinol SMA is used for a lot of high tech industry such as aero space, medical device, micro actuator, sensor system. However, Ni-Ti SMA is difficult to process to make a shape and fabrications as traditional machining process. Because nitinol SMA, that is contained nikel content more than titanium content, has similar physical characteristics of titanium. In this paper, the characteristics of ECM grooving process for nitinol SMA are investigated by experiments. The experiments in this study are progressed for power, gap distance and machining time. The characteristics are found each part. Fine shape in work piece can be found on conditions; current 6A, duty factor 50%, gap distance 15%, gap distance
, machining time 10min.
Pattern Shape Modulation by Scanning Methods in E-Beam Lithography
Oh, Se-Kyu ; Kim, Seoung-Jae ; Kim, Dong-Hwan ; Park, Keun ; Jang, Dong-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 558~564
To aim at obtaining a correct and fine small pattern by an electron beam lithography several conditions and methods affecting a real pattern shape needs to be investigated. A micro/nano sized pattern shape is sometimes dependent on the scanning method. In this work, four types of scanning methods are implemented and their characteristics are investigated. For a
pattern, a Zigzag scanning method proves a precise pattern generation. The other ways such as SEM scanning and swirl in-out scanning method result in some distorted pattern shape. It is proved that abrupt change in the pattern generation limits to obtaining a fine and small pattern.
Shifting Control Method for Automatic Transmission of PSD-Axle Forklift
Kwon, Soon-Ki ; Choi, Si-Young ; Kwon, Gi-Ryung ; Han, Seung-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 565~575
A forklift (also called a lift truck) is a powered industrial truck that is used to lift and transport materials. It has become an indispensable piece of equipment in manufacturing and warehousing operations. The modem forklift is equipped with automatic transmission to meet the requirement of loading and easy operation of the vehicle. This paper proposes the design of TECU(Transmission Electronic Control Unit) which is applied to PSD322-Axle transmission. Garofalo's control technique is generally used to the automatic transmission. We consider the work quality and market requirement that does not want to control engine throttle. This paper proposes new controller system which guarantees efficient speed changes with simple system. This new system does not control the engine throttle spontaneously. But it has the load of engine and vehicle as a maximum disturbance. The scope of the disturbance is limited to the stoll area of the torque converter. This paper proposes a ideal control commander that converges relative velocity of the input and ouput of a clutch into a zero. We design linear controller to execute the idea control commander. We applied the control algorithm to the forklift of PSD322-Axle type and the performance of this controller was verified.
Synthesis of Automatically Path-Generating Four-Bar Linkage Using NURBS
Hwang, Deuk-Hyun ; Yang, Hyun-Ik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 576~584
Up to now, it has been said that no satisfactory computer solution has been found for synthesizing four-bar linkage based on the prescribed coupler link curve. In our study, an algorithm has been developed to improve the design synthesis of four bar linkage based on the 5 precision points method. The suggested algorithm generates the desired coupler curve by using NURBS, and then the generated curve approximates as closely as possible to the desired curve representing coupler link trajectory. Also, when comparing each generated curve by constructing the control polygon, rapid comparison is easily achieved by applying convex hull of the control polygon. Finally, an optimization process using ADS is incorporated into the algorithm based on the 5 precision point method to reduce the total optimization process time. As for examples, two four bar linkages were tested and the result well demonstrated the effectiveness of the algorithm.
A Study on Optimal Design of Polymer Extruder Dies by CFD
Kim, Jea-Yoel ; Choi, Jin-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 585~589
Extruder is divided to greatly three part at extrusion process. First, by hopper(Hopper) second, barrel(Barrel) with Screw that is point of extruder and third that is raw material supply wealth extrusion into dies(DIES) Part that decide shape of do product greatly divide. Hopper is role that distribute in raw material supply wealth (Feeding zone) of Screw preserving raw material in state of high quality how at extrusion process, and make distributed raw material as Screw in barrel rotates and 3 stage and inflicting heat and pressure raw material melting(Melting) state. And raw material of melting state Screw's measuring stoker(Metering zone) whereabouts anaphora do and product is completed through pipe channel of dies. Dies that is the most important as Screw in extrusion is part that is last part of melting state process of raw material and causes huge effect in quality of product. If more than design of dies happens, manufacture itself of dies is hard, but there are a lot of amount of losses accordingly. In this research, make pipe channel that raw material of melting state flows in dies can present dies basic design method through flow analysis of ideal pipe channel using CFdesign.
Design of the Optimal Grinding Process Conditions Using Artificial Intelligent Algorithm
Choi, Jeong-Ju ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 590~597
The final quality of the workpiece is affected by the grinding process that has been conducted in final manufacturing stage. However the quality-satisfaction of ground workpiece depends on the skill of an expert in this process. Therefore, the process models of grinding have been developed to predict the states according to grinding process. In this paper, in order to find the optimized grinding condition to reduce the manufacturing expense and to meet requirements of ground workpiece optimization algorithm using E.S.(Evolutionary Strategy) is proposed. The proposed algorithm has been employed to find the optimal grinding and dressing condition using the grinding process models and nonlinear grinding constraints. The optimized results also presents the guide line of grinding process. The effectiveness of the proposed algorithm is verified through the experimental results.
A Study of Post-current Effect in DC Inverter Resistance Spot Welding
Lee, Hui-Jun ; Rhee, Se-Hun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 598~603
Resistance spot welding has been investigated to apply for manufacturing car bodies because of its high productivity. So quality of resistance spot weld is one of the major concerns for both automobile and aerospace industry. Current design trends in automotive manufacture have shifted emphasis to alternative lightweight materials in order to aid in producing vehicles with higher fuel efficiency and lower down the vehicle emission level for environmental control. There is increasing emphasis to provide lighter cars. Therefore there is an effort to use high strength steels such as HSLA, dual phase, in car body. However there is used in restricted because of difficulty in producing consistently high quality resistance spot welds. In this study, resistance spot welding schedules were developed to achieve acceptable welds with improved static mechanical properties. Improved resistance spot welding schedules were developed using post heating current to reduce the cooling rate, or in-process tempering to reduce the hardness of the weld produced. The effects of resistance spot welding process parameter on hardening fracture mode and static mechanical properties of the joints were determined.
A Study on Ultrasonic Image Diagnosis Methods of Tooth Defect with Phased-Array Techniques
Oh, Yun-Jung ; Hwang, In-Nam ; Park, Su-Jung ; Im, Kwang-Hee ; Cho, Hyun-Joon ; Cho, Young-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 604~613
Recently, researches to develop phased array ultrasonic examination techniques are proceeded to diagnose dental caries and the status of surgical operation of dental implant. Sound field analysis of phased array ultrasonic transducers were carried out in order to characterizing the ultrasonic phased array beams. The sound field of ultrasonic radiation was calculated for the sample called "gypsum-improved stone" with the similar characteristics of dental materials. Industrial phased array ultrasonic devices were utilized for the insptriion of the artificial flaws machined in the gypsum-improved stone. Dental implants were made at the pig jaw bone and defect images were confirmed for the dental implants.
A Study on the Durability Estimation of Vehicle Fuel Tank
Hong, Min-Sung ; Cho, Eun-Hee ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 614~620
A fuel tank of a vehicle is an important part due to its flammable contents ant its importance during crash conditions. Therefore, the fuel tank's design should be assessed for durability and robustness to ensure safety during the early development phase. Previously, evaluation for the durability was done by testing in physical driving conditions which could only be done after the completion of the vehicle. Computation simulation is a more effective method to evaluate the strength and durability of the fuel tank during the early stage. In this paper, two outstanding computational simulation methods are studied. One evaluates PV cycle fatigue due to build up pressure in the fuel tank and the other evaluates the PSD vibration fatigue from modal characteristics. The results show that computational methods agree with physical tests and are thus suitable to analyze the strength and durability of the fuel tank at early development phase.
Research on Light Reflection Effect of the Optical Micro Pattern Using Ultra-Precision Technology
Yoo, Chun-Kun ; Yoon, Chul-Yong ; Hyun, Dong-Hun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 621~628
Because the Ultra-Precision Technology increase its competitiveness in the field of the design, precision of processing technology, confidence and fixation degree are major considerations. According to Pattern shapes using these processing technologies, Light Reflection has influence on the sense of sight about human being. Based on background of these studies, we draw a plan about a round workpiece using a 3D design program and analyze the effect on Light Reflection changing a pattern angle and a source of light through SPEOS program in this research. We make Pattern form as V-Shape, and compare the area distributed by Light Reflection by classifying angle into 4 and analyze changes according to a source of light. In order to measure and evaluate the data from simulation analysis we has manufactured Diamond Tool and has processed Pattern precision using a Ultra-Precision Machine. Based on the result of this study, we forecast that the field of design will achieve rapid growth due to Ultra-Precision Technology in the world market.
Machinability Evaluation of the Plastic Mould Steel using AlTiN Coated Tool
Lee, Seung-Chul ; Cho, Gyu-Jae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 629~635
In this research, KP-4, one of the plastic mold steels, was coated with the AlTiN from one layer to four layers by the PVD method in the
8mm cemented carbide ball end mill. Coated KP-4 was processed with various conditions. For example, slope of
the spindle rotation speed was changed from 10,000rpm to 16,000rpm, the tool feeding speed was changed from 1,300mm/min to 1,700mm/min, the depth of cut was also changed from 0.3mm to 0.9mm, and etc. Cutting component force according to the coating layer number, and surface roughness were studied. The cutting component force showed a good agreement better the up ward direction than the down ward direction under all experimental conditions. In case of the condition per the material shape, it was lessen when the tool have larger angle because the average effective diameter of the tool is larger. The surface roughness showed good condition in case of the up ward than the down ward direction. And, in the 3rd layer of AlTiN coating, it showed the most suitable condition.
Machinability in Micro-precision Machining of Ni-Plated Layer by Diamond Tool
Kim, Seon-Ah ; Park, Dong-Sam ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 636~641
Recently, expansion of micro-technology parts requires micro-precision machining technology. Micro-groove machining is important to fabricate micro-grating lens and many micro-parts such as microscope lens, fluidic graphite channel etc. Conventional groove fabrication methods such as etching and lithography have some problems in efficiency and surface integrity. But, mechanical micromachining methods using single crystal diamond tools can reduce these problems in chemical process. For this reason, microfabrication methods are expected to be very efficient, and widely studied. This study deals with machinability in micro-precision V-grooves machining of nickel plated layer using non-rotational single crystal diamond tool and 3-axis micro stages. Micro V-groove shape, chip formation and tool wear were investigated for the analysis of machinability of Ni plated layer.
Dynamic Model Development and Simulation of Crawler Type Excavator
Kwon, Soon-Ki ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 642~651
The history of excavator design is not long enough which still causes most of the design considerations to be focused on static analysis or simple functional improvement based on static analysis. However, the real forces experiencing on each component of excavator are highly transient and impulsive. Therefore, the prediction and the evaluation of the movement of the excavator by dynamic load in the early design stage through the dynamic transient analysis of the excavator and ensuring of design technique plays an importance role to reduce development-cost, shorten product-deliver, decrease vehicle-weight and optimize the system design. In this paper, Commercial software DADS and ANSYS help to develop the track model of the crawler type excavator, and to evaluate the performance and the dynamic characteristics of excavator with various simulations. For that reason, the track of crawler type excavator is modelled with DADS Track Vehicle Superelement, and the reaction forces on the track rollers were predicted through the driving simulation. Also, the upper frame and cabin vibration characteristics, at the low RPM idle state, were evaluated with engine rigid body modelling. And flexibility body effects were considered to determine the more accurate joint reaction forces and accelerations under the upper frame swing motion.
A Development of Experimental Model Prediction of Leakage Pressure in MPW
Shim, Ji-Yeon ; Kim, Ill-Soo ; Kim, In-Ju ; Kang, Bong-Yong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 652~657
MPW(Magnetic Pulse Welding) is a technologies for welding of metals by means of repulsive force on account of the interaction between electro-magnetic field of coil and current induced in outer pipe. These MPW is one of the most useful welding process of welding ability of the dissimilar metal in which cylindrical materials, such as pipe, tube. As the quality of a weld joint is strongly influenced by process parameters during the welding process and the success of the welding to evaluated according to the leakage pressure. Generally, the process parameters is magnetic pressure, the gap between outer pipe and inner pipe, and the ratio of thickness to diameter of pipe(D/T) in MPW. Therefore, the goal of this study was to explain the effect of parameters on the weld joint leakage pressure. For these purposes, FFD(Fractional Factorial Design) were used for the experiment. The measured data were analyzed by regression analysis and verification experiments with random condition were conducted to confirm the suggested experimental model.
A Study on Evaluation of Bending Strength in FGM
Song, Jun-Hee ; Kim, Hong-Gun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 658~663
Metal/ceramic composites structures have many attractive properties with great potential for applications that demand high stiffness as well as chemical and biological stability, thermal and electrical insulation. They are currently in use for mechanical and thermal protection in cutting tool and engine parts. Thus, determination of adhesive properties for coating part is one of the most important problems for the extension of the use of coated materials. In this work, bending strength of Functionally Graded Materials(FGM) are evaluated by means of bending strength tester. The graded layer according to the load condition showed the change of the bend strength.
Development of a New Navigation Technology for Mobile Robot Based on Sonar Sensors
Nguyen, Van-Quyet ; Han, Sung-Hyun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 664~674
This paper presents the theoretical development of a complete navigation problem of a non-holonomic mobile robot by using sonar sensors. To solve this problem, a new method to compute a fuzzy perception of the environment is presented, dealing with the uncertainties and imprecision from the sensory system and taking into account nonholonomic constraints of the robot. Fuzzy perception, fuzzy controller are applied, both in the design of each reactive behavior and solving the problem of behavior combination, to implement a fuzzy behavior-based control architecture. Different experiments in populated environments have proved to be very successful. Our method is able to guide the mobile robot named KUM-Robo safety and efficiently during long experimental time.
The Machinability Estimation Depending on Cutting Condition in A16061-T6 Turning Operations
Choi, Tae-Kyu ; Kim, Jeong-Suk ; Park, Jin-Hyo ; Lim, Hak-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 675~680
Because of high specific stiffness, the aluminum alloy has been used for various industry field. Specially, the heat-treated aluminum alloy is difficult-to-machine material and machining test is necessary to evaluate and improve the machinability. In order to manufacture the functional part, appropriate cutting condition is selected by considering surface quality, machining time, and workpiece deflection by cutting force. In this investigation, the machinability of A16061-T6 is estimated by changing cutting conditions. The variable cutting conditions are cutting speed, depth of cutting, and feed rate. The estimation is done by analysis of cutting force, surface roughness, and surface shape according to the change of cutting conditions.
A Study on the Flexible Disk Deburring Process Arc Zone Parameter Prediction Using Neural Network
Yoo, Song-Min ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 681~689
Disk grinding was often applied to deburring process in order to enhance the final product quality. Inherent chamfering capability of the flexible disk grinding process in the early stage was analyzed with respect to various process parameters including workpiece length, wheel speed, depth of cut and feed. Initial chamfered edge defined as arc zone was characterized with local radius of curvature. Averaged radius and arc zone ratio was well evaluated using neural network system. Additional neural network analysis adding workpiece length showed enhance performance in predicting arc zone ratio and curvature radius with reduced error rate. A process condition design parameter was estimated using remaining input and output parameters with the prediction error rate lower than 2.0% depending on the relevant input parameter combination and neural network structure composition.
Pulverized Coal Injection System Development to Raise Combustion Efficiency of a Blast Furnace
Choi, Seung-Hyun ; Kwak, Na-Soo ; Kim, Jae-Yeol ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 690~696
This paper introduces the automatic fine Bituminous Coal injection lance position control method using flame image process. The fine Coal injection lance is used to supply additional heat into the furnace in Mill plant. It injects fine coal into high pressured air flow and produces very heated and high pressured flame. For the such high temperature and pressure, the fine coal injection lance effects not only efficiency of burner but also furnace abrasion. To keep efficient combustion status and to avoid the abrasion, in this paper, the flame is monitored by computer image process. This paper proposes the flame image process method and lance position control according to calculated result for flame image process.
Fabrication of Nano Master with Anti-reflective Surface Using Aluminum Anodizing Process
Shin, H. ; Park, Y. ; Seo, Y. ; Kim, B. ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 18, issue 6, 2009, Pages 697~701
A simple method for the fabrication of porous nano-master for the anti-reflection effect on the transparent substrates is presented. In the conventional fabrication methods for antireflective surface, coating method using materials with low refractive index has usually been used. However, it is required to have a high cost and long processing time for mass production. In this paper, we developed a porous nano-master with anti-reflective surface for the molding stamper of the injection mold, hot embossing and UV imprinting by using the aluminum anodizing process. Through two-step anodizing and etching processes, a porous nano-master with anti-reflective surface was fabricated at the large area. Pattern size Pore diameter and inter-pore distance are about 130nm and 200nm, respectively. In order to replicate anti-reflective structure, hot embossing process was performed by varying the processing parameters such as temperature, pressure and embossing time etc. Finally, antireflective surface can be successfully obtained after etching process to remove selectively silicon layer of AAO master.