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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal 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
Estimation and Evaluation of Volumetric Position Errors for Multi-axis Machine Tools
Hwang, Jooho ; Nguyen, Ngoc Cao ; Bui, Chin Ba ; Park, Chun-Hong ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 1~6
DOI : 10.7735/ksmte.2014.23.1.001
This paper describes a method of estimating and evaluating the volumetric errors of multi-axis machine tools. The estimation method is based on a generic model that was developed from conventional kinematic error models for the geometric and thermal errors to help predict the volumetric error easily in various configurations. To demonstrate the advantages of the model, an application in the early stages of a five-axis machine tool design is presented as an example. The model was experimentally evaluated for a four-axis machine tool by using the data from ISO230-6 and R-test measurements to compare the estimated and measured volumetric errors.
Steady State Performance Analysis of Five-mode Hybrid Power Transmission Systems
Lim, Won-Sik ; Kim, Nam-Woong ; Choi, Wan-Mug ; Park, Sung-Cheon ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 7~14
DOI : 10.7735/ksmte.2014.23.1.007
The core of the automotive industry's strategy to handle the climate change can be explained as the development and distribution of the vehicles with high fuel efficiencies and low emission. Clean Diesel, hydrogen fuel cell, electric, and especially hybrid power-train vehicles have been actively studied. This paper dynamically analyzes the performance of a hybrid system's five driving modes. The research subject consists of one engine, two electric motors, two simple planetary gears, and one compound planetary gears with five clutches. To define the steady state equation of the system, interaction formulas of five driving modes are introduced with motion variables and torque variables. These formulas are then used to analyze the speeds, torques, and power flows of each mode.
Development of Programmable Logic Controller-Based Supervisory System for Group Production Machine
Cho, Yongsik ; Ahn, Junghwan ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 15~20
DOI : 10.7735/ksmte.2014.23.1.015
The manufacturing equipment on most shop floors consists of numerical control machines, and the condition of each piece of equipment is monitored and controlled by an internal sensor or programmable logic controller (PLC). To control and monitor production lines that consist of an equipment or production module, a separate control and monitoring system such as a manufacturing execution system should be introduced. However, there is no standardized system, and it is costly and difficult to build a system for small or medium-sized plants. In this paper, a PLC-based supervisory system for operation control of a group of production machines is proposed, and the developed PLC-based system is evaluated by applying it to a computer numerical control machine.
Measurement of Archer's Paradox Size using Multiple Frames
Kim, Jonggeun ; Jeong, Yeongsang ; Song, Moonjae ; Kim, Sungshin ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 21~26
DOI : 10.7735/ksmte.2014.23.1.021
An arrow produced by a manufacturing process is evaluated using the archer's paradox and the intensity of the impact point. The accuracy rate in particular is changed by the arrow's vibrational movement, which is called the archer's paradox. The archer's paradox occurs not only in the right, left, upward, and downward directions, but in all directions. The optimized value of the archer's paradox has not been studied yet. This paper proposes to measure the archer's paradox to determine its optimized value. Measuring the archer's paradox using a high-speed camera is expensive, and it is difficult to translate the result to a numerical value. However, the device for measuring the archer's paradox proposed in this paper is inexpensive, and the results are easy to convert to a numerical value. Therefore, this device is more suitable for optimization of the archer's paradox than a high-speed camera. In this paper, we propose to measure the size of the paradox using multiple frames, which can measure the position of an arrow moving at a speed of 300km/h to within millimeters. We calculate the size of the paradox experimentally using the measured location in each frame. This value is not an approximate value, but an accurate numerical value.
Development of Tomograph Technique for Evaluating Thickness Reduction using Noncontact Ultrasonic Sensor Network
Lee, J.M. ; Kim, Y.K. ; Park, I.K. ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 27~31
DOI : 10.7735/ksmte.2014.23.1.027
This paper describes a tomographic imaging technique for evaluating the thickness reduction of a plate-like structure using a noncontact sensor network based on an electromagnetic acoustic transducer that generates shear horizontal plate waves. Because this technique is based on the effect of mode cutoff and time of flight of guided waves caused by a change in thickness, the tomographic image provides information on the presence of defects in the structure. To verify the performance of the method, artificial defects with various thickness reduction ratios were machined in an aluminum plate, and the tomographic imaging results are reported. The results show that the generated tomographic image displays the thickness reductions and can identify their locations. Therefore, the proposed technique has good potential as a tool for health monitoring of the integrity of plate-like structures.
Cryogenic Machining of Open-Cell Silicone Foam
Hwang, Jihong ; Cho, Kwang-Hee ; Park, Min-Soo ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 32~37
DOI : 10.7735/ksmte.2014.23.1.032
Open-cell silicon foam is difficult to cut using conventional machining processes because of its low stiffness. That is, open-cell silicon foam is easily pressed down when the tool is engaged, which makes it difficult to remove the material in the form of chip. This study proposes an advanced method of machining open-cell silicon foam by freezing the material using liquid nitrogen. Furthermore, the machining conditions are optimized to maximize the efficiency of material removal and minimize the usage of liquid nitrogen by conducting experiments under various machining conditions. The results show that open-cell silicone foam products with free surface can be successfully machined by employing the proposed method.
New Modularization Method to Design Supervisory Control of Automated Laboratory Systems
Jung, Taeyoung ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 38~47
DOI : 10.7735/ksmte.2014.23.1.038
This paper describes the application of discrete event systems theory to the design of an automated laboratory system. Current automated laboratory systems typically consist of several interacting processes that must be carefully sequenced to avoid any possible process conflicts. Discrete Event Systems (DES) theory and Supervisory Control Theory (SCT) can be applied together as effective methods of modeling the system dynamics and designing supervisory controllers to precisely sequence the many processes that such systems might involve. Classical approaches to supervisory controller design tend to result in complex controller structures that are difficult to implement, maintain, and upgrade. In this paper, a new approach to designing supervisory controllers for automated laboratory systems is introduced. This new approach uses a modular controller structure that is easier to implement, maintain, and upgrade, and deals with "state explosion" issues in a novel and efficient way.
Evaluation of Ultrasonic Characterization of Hardness after Heat Treatment of Piston Rods for Use of Vehicles
Im, K.H. ; Back, C.G. ; Jong, O.S. ; Hwang, Y.H. ; Jong, O.S. ; Kwon, S.H. ; Kim, H.G. ; Lee, H.H. ; Woo, Y.D. ; Zhang, G.L. ; Jung, J.A. ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 48~55
DOI : 10.7735/ksmte.2014.23.1.048
Many techniques are available for destructive and nondestructive measurement of mechanical hardness. The ultrasonic method could be widely applicable as a nondestructive technique. Many studies have examined how changes in the mechanical hardness affect the longitudinal velocity of ultrasonic waves. This approach aims to estimate the overall velocity variations in specimens. However, proper nondestructive examination techniques are needed as effective tools for analyzing the effects of heat treatment on the surface of the specimens. Therefore, in this study, the effect on the hardness of piston rods was nondestructively measured using surface ultrasonic waves. The hardness after heat treatment was investigated at various depths in the specimens, and the velocity of the surface ultrasonic waves was measured with respect to the hardness of the piston rods. In addition, finite element method simulations were performed to confirm the behavior of the waves.
Sommerfeld Phenomena of an Asymmetric Rotor
Shin, Eung-Soo ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 56~63
DOI : 10.7735/ksmte.2014.23.1.056
This paper provides a comprehensive study on the Sommerfeld phenomena in an asymmetric rotor with a nonideal power supply. An analytical approach is employed by deriving the equations of motion in a nondimensional form. The system parameters, including the asymmetry, external and internal damping, and motor power, are chosen to find their effects on the characteristics of the Sommerfeld phenomena and critical behavior around resonance. Results show that the rotor asymmetry suppresses the Sommerfeld phenomena and helps pass through resonance if the asymmetry is small. However, it is observed that the opposite effects exist in case of a large asymmetry. It is also found that the effects of external damping on the Sommerfeld phenomena are similar to those of the asymmetry, whereas internal damping has less effects than external damping and the asymmetry. By performing numerical simulations, four types of critical behavior are identified from the viewpoints of the stability and the passage through resonance.
Development of Surface-mount-type Crown-shaped Lens for Reducing Glare Effect of Light-emitting Diode Light Source
Park, Yong Min ; Bang, Hyun Chul ; Seo, Young Ho ; Kim, Byeong Hee ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 64~68
DOI : 10.7735/ksmte.2014.23.1.064
This paper introduces the use of a crown-shaped (CR) lens to effectively diffuse the light from a light-emitting diode (LED) without any loss in the light intensity, in contrast to polymer-bulb-type diffusers. The diffusion lens was designed based on the Snell's law, which describes the physical path of a ray passing through the boundary between different media. CR lenses were fabricated by polydimethylsiloxane (PDMS) casting and UV-embossing processes, which used a pre-designed metal mold and UV-curable resin, respectively. Through experiments and optical evaluations, it was verified that the newly proposed CR lens not only decreased the vertical light strength and glare effect from an LED light source but also improved the diffusion characteristics while maintaining the quality of the LED's light intensity.
Study on Dressing Conditions for Creep-feed in Cubic Boron Nitride Grinding of OrthoMTA Compacters
Maeng, Heeyoung ; Baek, Eun-Pyo ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 69~74
DOI : 10.7735/ksmte.2014.23.1.069
An OrthoMTA compacter is made by machining a Ni-Ti alloy wire using tapered helix creep-feed grinding machines. This aim of this study is to find the optimal dressing conditions to sharpen the corner of a cubic boron nitride (CBN) wheel. On the basis of the results of various experiments, it is verified that the most important factors in dressing are the dressing depth and feeding method, whereas the feed rate has less importance for producing a smaller corner R value. The study also finds the optimum dressing depth to reduce the dressing time, a feeding speed and method to stabilize the machining, and the mesh grade for the CBN wheel to make the groove of the compacter deeper.
Technique for Simulating Gain Tuning using SolidWorks
for a Six-Axis Articulated Robot
Jung, C.D. ; Chung, W.J. ; Kim, M.S. ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 75~82
DOI : 10.7735/ksmte.2014.23.1.075
For accurate gain tuning of the lab-manufactured six-axis articulated robot RS2 with less noise, in this study, a program routine using dynamic signal analyzer, which is a realization of a controller design algorithm in the frequency domain, is programmed using LabVIEW
. The contribution of this paper is the proposal of a simulation technique based on SolidWorks
for the gain tuning of a six-axis articulated robot. To realize the simulation, the LabVIEW
program used for experimental gain tuning is incorporated in to SolidWorks
. A comparison shows that the results of simulation-based gain tuning and experimental gain tuning are almost the same within a 5% error bound. On the basis of the comparison, it can be suggested that the simulation-based technique for gain tuning can be applied instead of experimental gain tuning to a six-axis articulated robot by interlocking SolidWorks
Numerical analysis and Experiment to Determine Deformation Characteristics of PET Bottle under Compressive Load
Cho, S.H. ; Kwon, C.H. ; Park, G.M. ; Ko, Y.B. ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 83~86
DOI : 10.7735/ksmte.2014.23.1.083
Many have been performed to decrease the thickness of polyethylene terephthalate (PET) bottles to reduce the manufacturing cost. However, it is difficult to guarantee the mechanical strength under top-loading after decreasing the thickness. This paper investigates the large deformation characteristics of a PET bottle under a compressive load using experimental and finite element analysis (FEA) data. A round 1.65-L bottle is analyzed under a compressive velocity of 5 mm/min with a maximum load of 9,800 N in experiments. The arc length method is used in a nonlinear FEA to understand the buckling phenomenon of the PET bottle. From the analyzed results, a recommendation is made to restrict the top loading to less than 1,208 N, because the first buckling phenomenon occurred at a load of 1,208 N.
Internal flow Analysis Research Design and Methodology for Trochoid Pump
Jeong, Seung Won ; Chung, Won Jee ; Kim, Myung Sik ; Jeon, Ju Yeal ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 87~93
DOI : 10.7735/ksmte.2014.23.1.087
This paper provides a methodology for extracting design data from the three-dimensional design software SolidWorks
, which is based on the existing trochoid pump design equations that are used by hydraulic field engineers. The data extracted from the SolidWorks
model are input to a hydraulic analysis software AMESim model to determine the design factors that can influence the properties of a trochoid pump. On the basis of the simulation results, this paper proposes a method to reduce the flow loss by adjusting the outlet angle of the trochoid pump. This proposal was verified by using actual experimental results, which confirmed that adjusting the outlet angle can increase the flow rate. Hence, the results presented in this paper can contribute to the prototyping of a trochoid pump by reducing the cost associated with a trial-and-error design.
Development of Automatic Alignment Height and Cross-section Inspection System for Fiber Bragg Grating Embedded Field Assembly Connector
Lee, Jung-Ho ; Park, Chan-Hee ; Yoon, Jae-Soon ; Lee, Hee-Kwan ; Kim, Cheol-Sang ; Kim, Jae-Won ; Kim, Kyung ; Kim, Jae-Jun ;
Journal of Manufacturing Technology Engineers, volume 23, issue 1, 2014, Pages 94~101
DOI : 10.7735/ksmte.2014.23.1.094
Recently, in order to reduce the time required to replace an optical jumper cord, many researchers are using a field-installable connector and applying the ferrule polishing method, ferrule mechanical contact method, or ferrule fusion contact method. However, the process of arranging the length of the optical fiber, i.e., inserting the optical fiber into the ferrule by hand and checking its cross section, takes 60% of the time required for the entire process, which increases the overall cost. Therefore, in order to make this task more cost-effective, we will develop an automated inspection system with automatic cross-sectional arrangement of a field-installable connector. This system will be able to decrease the failure rate from 10% to 2% compared with the conventional method when cutting the optical fiber inserted into the ferrule. It will also improve the productivity by decreasing the test time by 28% compared with the conventional method. Our studies showed that it was possible to reduce the production costs and improve the quality of a field-installable connector, and we expect it to dominate the market.