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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 19, Issue 6 - Dec 2010
Volume 19, Issue 5 - Oct 2010
Volume 19, Issue 4 - Aug 2010
Volume 19, Issue 3 - Jun 2010
Volume 19, Issue 2 - Apr 2010
Volume 19, Issue 1 - Feb 2010
Selecting the target year
공작기계분야 정부 R&D 지원현황 분석
Seo, Jae-Ik ; Mun, Jong-Deok ; Park, Jong-Man ; U, Chang-Hwa ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 5~10
차세대 마이크로팩토리 시스템 기술 개발
Park, Jong-Gwon ; No, Seung-Guk ; Kim, Byeong-Seop ; Song, Jun-Yeop ; Kim, Chan-Bong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 11~19
IWMF2010에서 나타난 마이크로 팩토리 연구의 기술동향
Park, Jong-Gwon ; Lee, Seong-Cheol ; No, Seung-Guk ; Kim, Byeong-Seop ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 20~26
Optimization of Spindle Units Considering the Decrease of Bearing Stiffness at High Speed Revolution
Lee, Chan-Hong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 717~723
Radial stiffness of angular contact ball bearings are decreased remarkably at high speed revolution, because the inner and outer ball contact angle with races arc changed under the ball centrifugal forces at high speed. In the past, the optimizations of spindle units were done under the assumption of unchanged bearing stiffness for the whole speed range. But the bearing stiffness is changed and the dimension of optimum spindle is also changed with speed. In the design phase, only one model of many optimum spindle models with speed should be selected. As optimization criterion, the area of transfer function at spindle nose is proposed to estimate simply and accurately improvement of dynamic characteristics in spindle units. Finally, according to many analyses of diverse spindle models with decreased bearing stiffness, the spindle with shorter bearing span is better than longer bearing span from the viewpoint of dynamic characteristics.
A Study on the Manufacturing of a High-Efficiency Load Cell Using a Single Surface Design
Lee, Jung-Hyun ; Lee, Woo-Ram ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 724~730
A load cell is a converter that generates voltage signals when a certain force is effected in a given direction. An essential measurement device for electronic scales that indicate weight by numbers. These load cells are being applied in various areas such as daily life, distribution, laboratory and industrial. Recently the study to manufacture load cells in a more simple method while increasing performance is being persisted. In this study based on the comparison of load cells manufactured through single surface processing using strain gauges. Those manufactured through dual surface processing using strain gauges. Ultimately persist a more simple method of load cell manufacturing while increasing its performance. The elements that were compared were linearity, hysteresis, creep and eccentricity which are short tenn performance factors. The conclusion was that single surface processing showed almost identical data as that of dual surface processing, and the load cell error rate(0.005%) also excess regulation. The manufacturing time was shortened while mass-production was possible. Which indicates a development in the weighing industry.
Numerical Modeling of the Mathematical Model of Single Spherical Bubble
Kang, Dong-Keun ; Yang, Hyun-Ik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 731~738
Cavitation is described by formation and collapse of the bubbles in a liquid when the ambient pressure decreases. Formed bubbles grow and collapse by change of pressure, and when they collapse, shockwave by high pressure is generated. In general, bubble behavior can be described by Rayleigh-Plesset equation under adiabatic or isothermal condition and hence, phase shift by the pressure change in a bubble cannot be considered in the equation. In our study, a numerical model is developed from the mathematical model considering the phase shift from the previous study. In the developed numerical model, size of single spherical bubble is calculated by the change of mass calculated from the change of the ambient pressure in a liquid. The developed numerical model is verified by a case of liquid flow in a narrow channel.
5-Axis CNC Machining of Roller Gear Cam
Cho, Hyun-Deog ; Yoon, Moon-Chul ; Kim, Kyung-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 739~745
The roller gear cam can control the rotational follower periodically by attaching several roller on the circumstance of follower shaft and it is widely used in non-backlash and precise actuating mechanism such as index table or ATC of machine tools. For machining the roller gear cam, 5 axis CNC machine tool is used and the geometric principle of CAM mechanism must be adopted to generate the NC-code and to develop the special CAD/CAM software because there is not commercial CAM system to machine the roller gear cam. The maker of the specially developed software in domestic user is generally from Japan or Taiwan. However these softwares do not reflect the post processing technique for finish machining in the module. Also, there is some limitation for further new application of itself and it needs higher costs for further application. In this study, the CAD/CAM software to overcome these problem was developed. And its reliability was verified by applying it in 5-axis CNC machining. Finally, the experimental result conducted in the 5-axis machining show good consistency in the movement of follower along the flute and in its Size.
Thermal Characteristic Estimation of NC Machining Center Bed following Rib Structure
Kim, Yang-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 746~752
Rib structure has been used to bed and column of machine tool to heighten weight stiffness ratio, cost performance and weight saving. In this paper the bed rib structure was estimated with thermal characteristics. Using superposition principle, machine tool designer can describe every complicated heat generation in the machine tool thermal source. As thermal characteristics, thermal deformation of guide rail and column and Maximum-minimum temperature variation were selected. The size, configuration and direction against the thermal loading surface operated to the thermal characteristics. The DB chart was made following rib structure estimating thermal characteristics. With superposition principle and DB chart, machine tool designer can prognosticate the thermal characteristics without FEM analysis to every bed rib structure.
Analysis of Fatigue Damage at Wheel under Variable Load
Cho, Jae-Ung ; Han, Moon-Sik ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 753~759
The variable fatigue load is simulated in this study. The stability and the life of the material are analyzed theoretically by Ansys program. These results are successfully applied to the practical wheel to predict the prevention of fracture and the endurance. The life and the damage on the every part of the fatigue specimen can be predicted. As the available lives are compared for every loading variation, the rain flow and damage matrix results can be helpful in determining the effects of small stress cycles in any loading history. The rainbow and damage matrices illustrate the possible effects of infinite life. The safety and stability of wheel and the other practical structures according to the variable load can be estimated by using the results of this study.
A study on the exit stage quality prediction of flexible disk process using neural network
Yoo, Song-Min ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 760~767
Even though a flexible disk grinding process was often applied to enhance the product quality, it produced non-flat zone in the beginning and the exit (end) area. Since latter area is susceptible to poor product quality with burn mark, careful analysis is required to cope with such degradation. The flexible disk grinding exit stage was analyzed for workpiece length, wheel speed, depth of cut and feed. The exit stage qualities defined as exit stage ratio and exit stage angle or slope was characterized. A neural network application results reveled that exit stage characteristics was predicted more accurately without workpiece dimension with minimum error of 1.3%.
Inspection of the Knuckle Bracket Holes of a Shock-Absorber using Image Processing Method
Jeong, Kyu-Won ; Ahn, Kye-Un ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 768~775
Automotive industry is a major business area in this country and it becomes more and more important. In order to maintain high quality of vehicles, every parts should be inspected. Among them the inspection job of the knuckle bracket holes of the outer tube of shock-absorber has been done manually until now. So, it takes long time and every product can not be inspected. An automatized inspection system was proposed utilizing machine vision technology, which was composed of a slit beam laser, CCD camera, image processing computer, special jig and illuminating back lights. An algorithm which could process images of the laser and bracket holes, then gave the position, radius, roundness of the holes, was developed. This system was applied for the good and no good products and the performance was confirmed.
Optimum Design of Movable Hydraulic Crane Booms
Yoo, Kwang-Seon ; Park, Jeong-Wan ; Sinichi, Hidaka ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 776~781
Optimum design of movable hydraulic crane's booms for weight reduction was performed in this study. Since the boom weight of the present used booms is very heavy, it is needed to make them lighter structure as possible as we can. Optimum design was performed for the booms by changing from the hexagonal cross section to triangular truss structure under the conditions, which are the allowable stress for the present cross section must be maintained, and the optimized weight must be minimized. CATIAV5 was used for stress analysis and design variables were established as the height and width of the triangular truss structure. As the results, it is found that the height of the truss structure is increased in proportion to the height of the booms and the maximum stress for optimal truss structure was obtained as 412MPa, which is lower than the allowable stress for the present hexagonal cross section. The optimized weight of the booms is reduced to about 19.88% comparing to the original weight.
Hygrothermal and Impact Damage Evaluation of CFRP Hat shaped sectional members with Stacking Angle Variation
Yang, Yong-Jun ; Sim, Jae-Ki ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 782~789
It is important to satisfy the requirements and standards for the protections of passengers in a car accident. There are lots of studies on the crushing energy absorption of a structure member in automobiles. In this paper, we have studied to investigate collapse characteristics and moisture absorption movements of CFRP( carbon fiber reinforced plastics) structure members when CFRP laminates are under the hygrothermal environment. In particular, the absorbed energy, mean collapse load and deformation mode were analyzed for CFRP members which absorbed most of the collision energy. Also, variation of stacking angle is important to increase the energy absorption capability. The purpose of this study is to evaluate the strength reduction and moisture absorption behavior of CFRP hat shaped member. Therefore we have made a impact collapse experiment to research into the difference of absorbed energy and deformation mode between moisture absorbed specimen and non-moisture absorbed. As a result, the effect of moisture absorption and impact loads of approximately 50% reduction in strength are shown.
A Horn of Half-wave Design and Manufacture for Ultrasonic Metal Welding
Kim, Eun-Mi ; Jang, Ho-Su ; Park, Dong-Sam ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 790~796
This paper designed the horn of half-wave needed for Ultrasonic meta) welding. The horn has to be designed and manufactured accurately, because measurements such as the shape, length, mass and etc. have effects on the resonant frequency and the vibration mode. Designed horn of half-wave has the feature of 40,000Hz of nature frequency, and maximizes vibration range in the Tip by resonance in the frequency of ultrasonic wave machine. In this study, we calculated and analyzed the natural frequency to find the optimal design of the horn that amplified the amplitude about double by the modal analysis and harmonic analysis using ANSYS. And we did FFT analysis of the manufactured horn.
Static Stiffness Tuning Method of Rotational Joint of Machining Center
Kim, Yang-Jin ; Lee, Chan-Hong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 797~803
A method has been developed to tune the static stiffness at a rotation joint considering the whole machine tool system by interactive use of finite element method and experiment. This paper describes the procedure of this method and shows the results. The method uses the static experiment on measurement model which is set-up so that the effects of uncertain factors can be excluded. For FEM simulation, the rotation joint model is simplified using only spindle, bearing and spring. At the rotation joint, the damping coefficient is ignored, The spindle and bearing is connected by only spring. By static experiment, 500 N is forced to the front and behind portion of spindle and the deformation is measured by capacitive sensor. The deformation by FEM simulation is extracted with changing the static stiffness from the initial static stiffness considering only rotation joint. The tuning static stiffness is obtained by exploring the static stiffness directly trusting the deformation from the static experiment. Finally, the general tuning method of the static stiffness of machine tool joint is proposed using the force stream and the modal analysis of machine tool.
Prediction of Fatigue Design Life in Magnesium Alloy by Failure Probability
Choi, Seon-Soon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 804~811
The fatigue crack propagation is stochastic in nature, because the variables affecting the fatigue behavior are random and have uncertainty. Therefore, the fatigue life prediction is critical for the design and the maintenance of many structural components. In this study, fatigue experiments are conducted on the specimens of magnesium alloy AZ31 under various conditions such as thickness of specimen, the load ratio and the loading condition. The probability distribution fit to the fatigue failure life are investigated through a probability plot paper by these conditions. The probabilities of failure at various conditions are also estimated. The fatigue design life is predicted by using the Weibull distribution.
Evaluating System for Fuel Injector with the Condition of a Driving Vehicle Mode Using an ECU HILS
Lee, Choong-Hoon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 812~828
A fuel injection system using an ECU HILS as an alternate to a vehicle test for the fuel injectors was developed. The throttle position, vehicle speed, engine speed, crank position, cam position, intake air flow, and several other sensor signals that are supplied to the ECU were measured and recorded as a data file for a vehicle driven in the FTP-75 mode in a chassis dynamometer. Electric signals that are equivalent to the sensor signals from the vehicle are reconstructed from the recorded data file using data acquisition boards, microprocessors, and computers. All sensor signals are supplied to the ECU with synchronized timing using a computer program. The findings show that the cost and time of vehicle experiments can be reduced using the ECU HILS system. Moreover, the repeatability of the generation of sensor signals can enhance the accuracy of a range of experiment related to vehicle testing. An ECU scanner that scans the sensor signals that are input to the ECU through a serial port was used to assess the accuracy of the reconstructed signals. The scanning results show good agreement with the reconstructed input signals. Injectors were connected to the ECU HILS system and were driven by the system to measure the quantity of injected fuel.
Rehabilitation Effectiveness Analysis for Upper Limb of Stroke Patients Using Haptic System
Lee, Soon-Tae ; Kim, Young-Tark ; Lee, Ho-Kyoo ; Song, Min-Sub ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 819~825
For rehabilitation of stroke patients the repeat training is needed. However it is difficult to keep up the training for the patients because it is boring. Even if the patients continue the training there is no objective way to evaluate the remedial value. Recently there is a new attempt to apply the haptic system to the rehabilitation of the stroke patients. In this study a haptic system is applied to the rehabilitation of the stroke patients. Through the comparative analysis of the experimental data for the normal people and patients, the validity of the proposed rehabilitation was verified. In conclusion, the patient's condition at 8 days after the experiment has demonstrated the level of ADL.
Reliability Based Topology Optimization of Compliant Mechanisms
Im, Min-Gyu ; Park, Jae-Yong ; Han, Seog-Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 826~833
Electric-thermal-structural actuated compliant mechanisms are mechanisms onto which electric voltage drop is applied as input instead of force. This mechanism is based on thermal expansion of material while being heated. Compliant mechanisms are designed subjected to electric charge input using BESO(bi-directional evolutionary structural optimization) method. Reliability-based topology optimization (RBTO) is applied to the topology design of actuators. performance measure approach (PMA), which has probabilistic constraints that are formulated in terms of the reliability index, is adopted to evaluate the probabilistic constraints. In this study, BESO method is used to obtain optimal topology of compliant mechanisms from initial design domain. PMA approach is used to evaluate reliability index. The procedure has been tested in numerical applications and compared with the results obtained by other methods to validate these approaches.
Development of a LDI System for the Maskless Exposure Process and Energy Intensity Analysis of Single Laser Beam
Lee, Soo-Jin ; Kim, Jong-Su ; Shin, Bong-Cheol ; Kim, Dong-Woo ; Cho, Meyong-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 834~840
Photo lithography process is very important technology to fabricate highly integrated micro patterns with high precision for semiconductor and display industries. Up to now, mask type lithography process has been generally used for this purpose; however, it is not efficient for small quantity and/or frequently changing products. Therefore, in order to obtain higher productivity and lower manufacturing cost, the mask type lithography process should be replaced. In this study, a maskless lithography system using the DMD(Digital Micromirror Device) is developed, and the exposure condition and optical properties are analyzed and simulated for a single beam case. From the proposed experimental conditions, required exposure experiments were preformed, and the results were investigated. As a results, 10
spots can be generated at optimal focal length.
A Study on the Mechanical Properties of the Friction Welding with Hollow and Solid Shaft of SM45C
Koo, Keon-Seop ; Choe, Won-Yong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 841~846
The present study examined the mechanical properties of the friction welding with hollow and solid shaft of SM45, of which the diameter is 25.2mm and 33mm. Friction welding was conducted at welding conditions of 2,000rpm, friction pressure of 50MPa, upset pressure of 70MPa, friction time of 0.4sec to 1.4sec by increasing 0.2sec, upset time of 2.0 sec including variable such as friction time are following. Under these conditions, a tensile test, a hardness test and a microstructure of weld interface were studied. The results were as follows : When the friction time was 1.0 seconds under the conditions, the maximum tensile strength of the friction weld happened to be 1,094MPa, which is 120% compared with the tensile strength of SM45C base metal. The upset length linearly increased as friction time increased. According to the hardness test, the hardness distribution of the weld interface was formed from 475Hv to 739Hv. HAZ(Heat Affected Zone) was formed from the weld interface to 2mm of SM45C.
Development of Automobile Windows Motor Cover by Thermoplastic Elastomer(TPE)
Cho, Young-Tae ; Ko, Boum-Yong ; Lee, Choong-Ho ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 847~851
It was attempted to develop an auto part by over molding injection mold that produces precision products in high productivity with use of an eco-friendly TPE substitute material for NBR. NBR is currently used in motor gear cover, one of the key parts in motor module for auto doors. Gear cover is composed of plastics and rubber mostly today, which requires a two (2) step process for production using two presses of different types. A hot press is used at this time for forming the rubber, which has drawback of requiring a rather long forming time of 400 seconds for one forming process. Even though this difficulty is overcome by reducing production time through employment of multi-cavity molds, time for forming process must be shortened for improvement of the productivity eventually, and the existing method of insert injection for products that have been formed with plastic material must be outgrown. In this point of view, over molding injection using TPE has a big advantage. Forming time is shortened to 54 seconds, and working the two (2) processes in series by one (1) press could solve the durability problem caused by deflection of the plastics, not to mention shortening the process time. Enhancement of productivity by almost 80% and improvement in the accuracy of the product could thus be achieved.
The Stress Distribution Characteristics of HSK Tooling System According to Spindle Speed
Ku, Min-Su ; Kim, Jeong-Suk ; Kang, Ik-Soo ; Park, Jin-Hyo ; Lee, Jong-Hwan ; Kim, Ki-Tae ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 852~858
Recently, the high-tech industries, such as aerospace industry, auto industry, and electronics industry, are growing up considerably. Because of that, high machining accuracy and productivity of precision parts have been required. The tooling system is important part in the machining center. HSK tooling system is more suitable than BT tooling system for that of high speed machining center. It is because static stiffness and machining accuracy of HSK tooling system are higher than those of BT tooling system. In this paper, stress distribution characteristics of the HSK tooling System is analyzed according to the spindle speed. In order that, the mechanism and the force amplification principle of HSK tooling system are analyzed. The HSK tooling system is modelled by using a 3D modeling/design program. Then stress distribution characteristics of HSK tooling system are analyzed according to spindle speed by using the finite element analysis.
Design and Machining Precision Evaluation of Pneumatic Clamping Type Guide-bush System
Lee, Jae-Hoon ; Yi, Su-Min ; Park, Seong-Hun ; Lee, Shi-Bok ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 859~866
Generally, a fixed type guide-bush system is installed during machining miniature work-pieces with high precision in the multi-task CNC lathe. But a conventional guide-bush system does not provide a constant clamping force under the condition of varying work-piece diameters. It is important to maintain a constant clamping force for guaranteeing machining precision. This paper proposes a new guide-bush system with a pneumatic clamping device for the CNC Swiss-turn lathe to keep constant clamping force with changes in work-piece diameters. Through performance tests, new clamping system developed in the study showed better machining precision at the cost of a small increase in the temperature of the system than conventional systems due to an increase in the frictional heat and a change in the heat transfer route.
Precision Film Control of Roll to Roll System for RFID Printing
Kim, Dong-Min ; Choi, Jong-Guen ; Kim, Hyung-Sun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 867~874
RFID printing technology has emerged recently as an important tool for leading future IT. Therefore, many manufacturers concerning on low cost and mass production of the related products pay close attention to the printing technology. In order to realize printed electronics, the technologies for fine line-width/gap printing and registration are essential work. This study proposes a precise Roll to Roll control system that is capable of tilting two posts. Two controllable tilting posts can adjust film position at traverse direction for the precision registration. A mathematical model for representing the geometric features of each posts in Roll to Roll printing system is established first. Then an operating program is built to implement the system and to control film movement. For experimental test, a hard ware system is fabricated which is consisted of two AC servo motors, two posts tilting mechanisms, several guide rolls, and so on. The test results show the proposed system can control the film position precisely at transverse direction.
Reconfiguration of Automobile Assembly System using Augmented Reality Technology
Choi, Hung-Won ; Park, Jin-Woo ; Jeong, Sang-Yeong ; Park, Hong-Seok ; Ko, Sung-Woo ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 875~882
Nowadays, the global market requires a variety of products and shorter life cycle to fulfill the diverse demands of customers. To survive in the turbulent and competitive markets, automobile assembly companies must design and implement manufacturing systems that respond rapidly to market demands. In this paper, methods for reconfiguring system based on modular concept is proposed using AR(Augmented reality) technologies. First, the relationship matrixes between change drivers and system components are generated to divide existing manufacturing system to each module. And, new change drivers are selected based on required function in new system. Through the modification of relationship matrix, the concept design of new system is proposed and implemented in AR environment. Finally, according to proposed methods and procedure in this paper, the existing cockpit assembly system is reconfigured to spare tire assembly system as a case study. As the use of the modular-based reconfiguration method in AR environment, the time and cost for reconfiguring manufacturing system will be reduced dramatically.
A Fundamental Study on Offshore Structures of high pressure control valve
Lee, Chi-Woo ; Jang, Sung-Cheol ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 883~888
This study have goal with conceptual design for Offshore Structures of high pressure control valve for localization. Ball valve for development accomplished with flow analysis based on provision of ANSI B16.34, ANSI B16.10, ANSI B16.25 In order to localize the Offshore Structures high pressure control valve. Numerical simulation using CFD (Computational Fluid Dynamic) in order to predict a mass flow rate and a flow coefficient form flow dynamic point of view. The working fluid assumed the glycerin (C3H8O3). The valve inlet and outlet setup a pressure boundary condition. The outlet pressure was fixed by atmospheric pressure and calculated until increasing 1bar to 10bar. CFD analysis used STAR-CCM+ which is commercial code and Governing equations were calculated by moving mesh which is rotated 90 degrees when ball valve operated opening and closing in 1 degree interval. The result shows change of mass flow rate according to opening and closing angle of valve, Flow decrease observed open valve that equal percentage flow paten which is general inclination of ball valve. Relation with flow and flow coefficient can not be proportional according to inlet pressure when compare with mass flow rate. Because flow coefficient have influence in flow and pressure difference. Namely, flow can be change even if it has same Cv value. The structural analysis used ANSYS which is a commercial code. Stress analysis result of internal pressure in valve showed lower than yield strength. This is expect to need more detail design and verification for stem and seat structure.
Development of Shrink-Fit Tool Holder using Shape Memory Alloys
Shin, Woo-Cheol ; Ro, Seung-Kook ; Kim, Byung-Sub ; Park, Jong-Kweon ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 19, issue 6, 2010, Pages 889~894
Conventional shrink-fit tool holders have positive features, such as high accuracy, high strength, high stiffness and low sensitivity to centrifugal forces, but they require heavy investments for heating and cooling equipment. Generally the heating equipment has to heat the tool holder up to
for tool changes. This paper introduces a novel shrink-fit tool holder that is able to unclamp a tool at
. This feature makes it possible to switch between the clamped and unclamped states by using a simple device, which has lower power, smaller size and lower cost than the heating equipment of the conventional shrink-fit tool holders. The proposed shrink-fit tool holder is able to expand its tool hole by using the shape memory alloys which are integrated in the tool holder body. Performances of the SMA shrink-fit tool holder were evaluated experimentally. The experimental results confirm that the proposed tool holder is feasible in aspects of clamping/unclamping operations, clamping force and repeatability of tool setup.