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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 23, Issue 6 - Dec 2014
Volume 23, Issue 5 - Oct 2014
Volume 23, Issue 4 - Aug 2014
Volume 23, Issue 3 - Jun 2014
Volume 23, Issue 2 - Apr 2014
Volume 23, Issue 1 - Feb 2014
Selecting the target year
Development of Rotary Transfer Forming Device for Process Reduction in Forming
Kim, Seung-Gi ; Youn, Jae-Woong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 413~420
DOI : 10.7735/ksmte.2014.23.5.413
Although the transfer forming process has various advantages, it is also inefficient for the use of multiple press machines, especially for small part sizes. In this study, a new forming process was proposed to use multiple tandem dies in a single press machine. A rotary transfer forming device was developed to combine the advantages of the progressive and transfer forming process. In this study, a detailed forming process using this device was analyzed, and the device was designed to perform four series of tandem forming processes in a single press. In order to analyze the feasibility of this forming process, simple forming dies were made. As a result, the position accuracy was 4 arcsec, and the forming speed reached up to 20 strokes per minute. It is thought that this rotary transfer forming device can help to save initial setup costs through the more efficient use of space in a press machine.
Kinestatic Control using Six-axis Parallel-type Compliant Device
Kim, Han Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 421~427
DOI : 10.7735/ksmte.2014.23.5.421
In this paper, the kinestatic control algorithm using a six-axis compliant device is presented. Unlike the traditional control methods using a force/torque sensor with very limited compliance, this method employs a compliant device to provide sufficient compliance between an industrial robot and a rigid environment. This kinestatic control method is used to simply control the position of an industrial robot with twists of compensation, which can be decomposed into twists of compliance and twists of freedom. A simple design method of a six-axis parallel-type compliant device with a diagonal stiffness matrix is presented. A compliant device prototype and kinestatic control hardware system and programming were developed. The effectiveness of the kinestatic control algorithm was verified through two kinds of kinestatic control experiments.
Real-time Measurement System for 3D Motion of a Body
Kim, Wonjin ; Yoon, Hyesung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 428~434
DOI : 10.7735/ksmte.2014.23.5.428
Measurement of the absolute displacement of the moving machinery components in three-dimensions (3D) is of critical functional importance. This paper describes the system that measures motion associated with six degrees-of-freedom in 3D. Wire-sensors are used to estimate the positions of an object in a 3D Cartesian coordinate system, based on the values of their initial position and the measured values. For inducing the transfer function, which represents the motion of an object, the number of the minimum measurement points is determined. Also, the experimental measuring device is configured to visualize the behavior of a rectangular object in real-time. The software for measuring the six types of motions is directly programmed using a commercial software.
Non-Contact Pick-up System for Turning Large Flexible Thin Sheets
Kim, Joon Hyun ; Ahn, Sung Wook ; Lee, Se Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 435~442
DOI : 10.7735/ksmte.2014.23.5.435
This paper describes an improved design model that can be used to configure a non-contact pneumatic device to turn a large sheet at the in-line system. For rotational moving in the conveyor system, the conventional method is to turn the system itself. The improved non-contact pick-up system mainly uses 8 pairs of L-shaped latches and 12 swirl type heads. It is positioned above the upward air flow table. This system performs the non-contact gripping and side-edge contact support in the vertical and rotational directions to hold the self-weight of a large flat sheet. A non-contact air head can exert a sufficient gripping ability at 4N lower than the standard working pressure. The side latches support 60% of the lifting force required. Through structural and flow analysis, the working conditions were simultaneously considered in accordance with the deflection and flatness of the glass.
Development of a Turbine Based Flywheel Energy Storage System Using Traveling Wind Power of an Urban Train
Seo, Yong-Bum ; Im, Jae-Moon ; Shin, Kwang-Bok ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 443~449
DOI : 10.7735/ksmte.2014.23.5.443
This study aims to develop a Flywheel Energy Storage System (FESS) that uses wind power produced when an urban train is in motion, by utilizing a mounted turbine. This system was designed to generate and store electric power from wind power of a travelling urban train. The flywheel was designed to continue rotation using a one-way clutch bearing installed in the turbine shaft pulley, even in cases where the urban train decelerates or stops. This FESS can generate an additional 44% of electric power in comparison to a system not equipped with a flywheel. The generated power and operational features of the FESS were evaluated and verified through a wind tunnel test. The results show that the electric power stored in the FESS could supply auxiliary power for urban train components or service equipment, such as charging mobiles, Wi-Fi modules, and electric lights.
A Study on Thermal Stress of Power Piping due to Loop Design
Lee, JungHyun ; Park, JiSung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 450~455
DOI : 10.7735/ksmte.2014.23.5.450
Domestic power plants have consistently been developed over the years in industrially developed nations with high standards of living. Considering the power plant development strategy, design efficiency is of upmost importance. Therefore, an improper design directly affects the power plant`s risk management plan and the potential risks of the piping system. Therefore, in this study, research is intended to be carried out to allow efficient power plant operation, through optimization of the design of the piping system. The purpose of the study is to confirm economic feasibility by changing the piping loop design, expanding the length of pipe loops, and to investigate the thermal stress influence on the piping system through simulations of systems similar in condition to those currently used in existing plants in Korea.
Optimal Design and Performance Evaluation of X-type Magnetic Spring Suspension for Commercial Vehicle Seat
Kwac, Lee Ku ; Kim, Hong Gun ; Song, Jung Sang ; Shin, Hee Jae ; Seo, Min Kang ; Kim, Byung Ju ; An, Kay Hyeok ; Lee, Hye Min ; Han, Woong ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 456~464
DOI : 10.7735/ksmte.2014.23.5.456
Commercial vehicle drivers typically feel more fatigued compared to general-public drivers. because they spend longer periods of time driving and experience more rough road conditions. This study showed that the application of a magnet, a linear spring, and a seat suspension with nonlinear characteristics was the optimal design to increase comfort while driving. The resonant frequency for the optimal design suspension was 2.8 Hz, and the stiffness was analyzed through displacement-load experiments. Vibration transmissibility was analyzed by suspension stiffness and the existing dynamic compression. The magnetic spring type was at 0.875. As a result, the X-type magnetic spring performed better than the existing spring at 0.729.
A Study on Machining Distortion of Airfoil Effected by Fixture and Process
Ra, Kyeong-Woon ; Ji, Seong-Bum ; Jo, Yeong-Jin ; Park, Je-Hong ; Seo, Sang-Won ; Kim, Su-Jin ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 465~470
DOI : 10.7735/ksmte.2014.23.5.465
Thin and wide airfoils are difficult to be machined precisely because they are deformed during and after machining processes. This paper presents the results of the airfoil deformation measured by three-dimensional (3D) scanning equipment. It also discusses the influences of fixture and the machining process on the distortion of the thin airfoil. The simple fixture bended the thin airfoil to a U-shape at the first process, and the vacuum fixture decreased the distortion of the machined airfoil at the second process. The long and thin airfoil supported by two points was buckled during the machining at its two end-regions at the third process. Results from this study suggest that use of vacuum fixture decreases the machining distortion of thin and wide airfoils.
Numerical Analysis on the Development of Shut off Damper for a Tsunami at a Nuclear Plant
Park, Joo-Young ; Yi, Chung-Seob ; Chin, Do-Hun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 471~477
DOI : 10.7735/ksmte.2014.23.5.471
The purpose of this study was to predict the load effect on a damper installed at a nuclear power plant building after a tsunami using a volume of fluid (VOF) numerical analysis method. The wave height was determined by a sine wave function and the tsunami condition was estimated by the wave length. Also, using computational fluid dynamics (CFD), the maximum damper load was set as a boundary condition for the structural analysis that verified how stress and deformation affect the damper. As a result, such simulations estimated the highest stress distribution for a wave length of 350 m with a maximum stress present at the cross point of stiffness installed at the rear end of the damper. The total deformation was approximately 32 mm at the center of damper.
Analysis of Contact Resonance Frequency Characteristics for Cantilever of Ultrasonic-AFM Using Finite Element Method
Lee, Joo Min ; Han, You Ha ; Kwak, Dong Ryul ; Park, Ik Keun ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 478~484
DOI : 10.7735/ksmte.2014.23.5.478
Ultrasonic atomic force microscopy(Ultrasonic-AFM) can be used to obtain images of the elastic properties of a subsurface and to evaluate the elastic properties by measuring the contact resonance frequency. When a tip is in contact with the sample, it is necessary to understand the cantilever behavior and the tip-sample interaction for the quantitative and reliable analysis. Therefore, precise analysis models that can accurately simulate the tip-sample contact are required; these can serve as good references for predicting the contact resonance frequency. In this study, modal analyses of the first four modes were performed to calculate the contact resonance frequency by using a spring model, and the deformed shapes of the cantilever were visualized at each mode. We presented the contact characteristics of the cantilever with a variety of contact conditions by applying the contact area, contact material thickness, and material properties as the parameters for the FEM analysis.
A Study on the Robot Vision Control Schemes of N-R and EKF Methods for Tracking the Moving Targets
Hong, Sung-Mun ; Jang, Wan-Shik ; Kim, Jae-Meung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 485~497
DOI : 10.7735/ksmte.2014.23.5.485
This paper presents the robot vision control schemes based on the Newton-Raphson (N-R) and the Extended Kalman Filter (EKF) methods for the tracking of moving targets. The vision system model used in this study involves the six camera parameters. The difference is that refers to the uncertainty of the camera`s orientation and focal length, and refers to the unknown relative position between the camera and the robot. Both N-R and EKF methods are employed towards the estimation of the six camera parameters. Based on the these six parameters estimated using three cameras, the robot`s joint angles are computed with respect to the moving targets, using both N-R and EKF methods. The two robot vision control schemes are tested by tracking the moving target experimentally. Given the experimental results, the two robot control schemes are compared in order to evaluate their strengths and weaknesses.
Study on the Measurement of Flexural Strain Using the Digital Image Correlation in the Three-Point Bending Test
Choi, In Young ; Kang, Young June ; Hong, Kyung Min ; Ko, Kwang Su ; Lee, Hak Sung ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 498~504
DOI : 10.7735/ksmte.2014.23.5.498
Displacements and strains are very important for material evaluation as critical factors to a machine`s life cycle and safety. Typically, the strain gauge has been employed to measure displacement and strain. However, this contact-type measurement method has disadvantages that are not quantified under the test conditions of a specific object shape, surface roughness, and temperature. In this paper, the measurement of deflection and flexural strain due to the three-point bending test is presented, employing Digital Image Correlation (DIC) methods. In order to ensure measurement reliability, DIC and universal test machine methods were compared by measuring the deflections and flexural strains developed by such bending tests.
A Simulation Study for Optimizing the Functionality of an Automated Storage and Retrieval System
Kim, Moon Ki ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 505~511
DOI : 10.7735/ksmte.2014.23.5.505
The functional role of warehouses in modern industry is changing from an established concept of storage to a concept of circulation. The target of this study is to improve the stacker crane`s efficiency for the internal operations of the Automated Storage and Retrieval System (AS/RS). Eight operating schemes are proposed under the combination of three conditions, namely, the storing method, the layout type, and the sequence of command execution. The moving distance of the stacker crane is calculated using the same gateway data through a simulation based on a C# program. The optimal operating scheme is proposed based on the analyzed simulation results. In conclusion, the combination of conditions of random storage, two-way type warehouse, and dual command execution elicits optimum results in travel efficiency for the stacker crane.
Influence of the Part Shape Complexity and Die Type on Forming Accuracy in Incremental Sheet Metal Forming
Lee, Kyeong-Bu ; Kang, Jae-Gwan ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 512~518
DOI : 10.7735/ksmte.2014.23.5.512
In this paper, the influence of part shape complexity and die type on forming accuracy in incremental sheet metal forming is presented. The part shape complexities are classified into two types, namely, of one and two-step shapes. Correspondingly, die types are classified into three types, namely, of no-, partial, and full die types. The experimental tests are performed separately on negative and positive forming methods. It is shown that for the one-step shape, there are no significant differences in forming errors between the cases of no- and full die types when the negative forming method is used. Furthermore, the full die type is better than the partial die when positive forming is used. For the two-step shape case, the full die type always exhibits better forming accuracy than the no- and partial die types, irrespective of the forming method used.
A Study on Warm Forming Technology of Car Body Reinforced Dash Using Magnesium Alloy Sheet
Park, Dong Hwan ; Tak, Yun Hak ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 519~524
DOI : 10.7735/ksmte.2014.23.5.519
The use of light weight magnesium alloy offers significant potential towards improvement of the automotive fuel efficiency. However, the application of formed magnesium alloy components in auto-body structures is restricted due to the low formability at room temperature and lack of knowledge for processing magnesium alloys at elevated temperatures. In this study, a warm tensile test of magnesium alloys was performed to measure tensile strength and elongation. An improvement in formability was confirmed at increased temperatures above about
. Car body warm forming technology was conducted for forming forming reinforced dash components of the magnesium alloy AZ31B sheet at elevated temperatures.
A Study on Laser Welding Application of the Cowl Cross Member for Ultra-High Strength Steel
Park, Dong Hwan ; Yun, Jae Jung ; Kim, Kun Young ;
Journal of The Korean Society of Manufacturing Technology Engineers, volume 23, issue 5, 2014, Pages 525~531
DOI : 10.7735/ksmte.2014.23.5.525
A cowl cross is a part of the car`s instrument panel used to maintain the rigidity of the vehicle body side. The application of laser welding has the benefits of speed and thermal deformation compared to arc welding. An ultra-high strength steel sheet is used to reduce the weight of the vehicle body parts. Generally, formability of such a steel sheet is poor because its elongation is very low. For this reason, a method for cold forming of an ultra-high strength steel sheet is required. This paper describes how to improve the formability and weldability of the ultra-high strength steel sheet. Mechanical tests of this material were also performed to evaluate the welding properties of
(GMAW) and those of laser welding.