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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
Journal Basic Information
Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 30, Issue 12 - Dec 2013
Volume 30, Issue 11 - Nov 2013
Volume 30, Issue 10 - Oct 2013
Volume 30, Issue 9 - Sep 2013
Volume 30, Issue 8 - Aug 2013
Volume 30, Issue 7 - Jul 2013
Volume 30, Issue 6 - Jun 2013
Volume 30, Issue 5 - May 2013
Volume 30, Issue 4 - Apr 2013
Volume 30, Issue 3 - Mar 2013
Volume 30, Issue 2 - Feb 2013
Volume 30, Issue 1 - Jan 2013
Selecting the target year
Development of Ultrasonic Grinding Wheel for Hybrid Grinding System
Kim, Kyeong Tae ; Hong, Yun Hyuck ; Park, Kyung Hee ; Lee, Seok Woo ; Choi, Hon Zong ; Choi, Young Jae ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1121~1128
DOI : 10.7736/KSPE.2013.30.11.1121
Ultrasonic grinding system is that the ultrasonic vibration by ultrasonic actuator is applied on conventional grinding system during grinding process. The Ultrasonic vibration with a frequency of over 20kHz can reduce grinding forces and increase surface quality, material removal rate (MRR) and grinding wheel life. In addition, ultrasonic vibration assisted grinding can be used for the materials that are difficult to cut. In this paper, methodology for ultrasonic tools is studied based on finite element method, and in turn the ultrasonic tools are designed and fabricated. It is found that the ultrasonic tool can vibrate with a frequency of 20kHz and amplitude of
. In order to verify the machining performance, the grinding experiment is performed on titanium alloy. By applying ultrasonic vibration, the grinding force and temperature are reduced and MRR is increased compared with the conventional grinding.
Development of Multi-functional Centerless Grinding System with 600 mm Wide Grinding Wheels
Oh, Jung Soo ; Cho, Chang Rae ; Tsukishima, Hidehiro ; Cho, Soon Joo ; Park, Chung Hong ; Oh, Jeong Seok ; Whang, In Bum ; Lee, Won Jae ; Kim, Seok Il ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1129~1137
DOI : 10.7736/KSPE.2013.30.11.1129
We report a centerless grinding machine which can perform multi-function with 600 mm wide grinding wheels. By increasing manufacturing area, long workpiece such as camshaft and steering shaft, is allowed to grind more quickly, compared with cylindrical grinding system. In this paper, the design of centerless grinding machine puts emphasis on symmetry to exploit the thermal stability. Results of finite element analysis shows that the difference of the structural deflection in the front and rear guideways is less than
due to symmetric design. The difference is less than
, even though the thermal deformation is considered. According to the performance evaluation, the radial error motion of the G/W spindle, which is measured by applying Donaldson Ball Reversal, is about
. The yaw error of the G/W slide is improved from 2.1 arcsec to 0.5 arcsec by readjusting the slide preload and ball screw.
The Development of Hybrid Vertical Grinding System
Choi, Seung Geon ; Kim, Seong Hyun ; Choi, Woong Kirl ; Lee, Eun Sang ; Choi, Ji Hun ; Lee, Seok Joo ; Kim, Kyu Dong ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1139~1145
DOI : 10.7736/KSPE.2013.30.11.1139
Machine tools are the cores of industrial development in recent period. It is difficult to develop a system which can do cutting and grinding process in the one system. Hybrid Vertical Grinding System is capable of processing in a single apparatus cutting or grinding. The modal analysis and structural analysis for the development of Hybrid Vertical Grinding System is the first time of domestic work. This paper describes the technologies of Hybrid Vertical grinding machine and intend to introduce the studies in the development of the Hybrid Vertical Grinding System.
A Study on the Development of Multi Grinding Machine for Automotive Crankshaft
Choi, Yun Seo ; Park, Hwi Keun ; Hwang, In Hwan ; Cho, Hyun Taek ; Song, Soon Tae ; Choi, Jun Seok ; Lee, Nam Doo ; Lee, Jong Chan ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1147~1151
DOI : 10.7736/KSPE.2013.30.11.1147
A Crankshaft Multi Grinding Machine is developed for manufacturing of high precision crankshaft. The grinding head part of the developed machine should be moved precisely during grinding of work materials. In this paper, structural and modal analysis for the crankshaft multi grinding machine is carried out to check the design criteria of the machine.
A Heuristic Approach for Grading Operation of Hydraulic Excavator Systems using SMISMO Valve Configuration
Joh, Joongseon ; Hwang, Cheol Min ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1153~1160
DOI : 10.7736/KSPE.2013.30.11.1153
SMISMO valve configuration is now starting to draw attention of the researchers of the construction equipment industry to increase the fuel efficiency of their equipment like excavators and wheel-loaders. An open-loop control strategy for grading operation of hydraulic excavator systems using SMISMO valve configuration is investigated in this paper. Tabor's algorithm for 1 d.o.f. SMISMO system under the assumption of quasi-static operation is revealed as not adequate for multi d.o.f. system with large moment of inertia even though the motion of the system is slow. New parameters are proposed in this paper. It modifies Tabor's open-loop control strategy for the grading operation of hydraulic excavators using SMISMO valve configuration. A simulation-based parameter tuning method is also proposed. It uses GA (Genetic Algorithm) to find the best parameter values. Simulation study for a practical hydraulic excavator shows the validity of the proposed open-loop control strategy.
Development of Educational Robot Platform Based on Omni-directional Mobile Mechanism
Chu, Baeksuk ; Sung, Young Whee ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1161~1169
DOI : 10.7736/KSPE.2013.30.11.1161
In this paper an omni-directional mobile robot is suggested for educational robot platform. Comparing to other robots, a mobile robot can be easily designed and manufactured due to its simple geometric structure. Moreover, since it is required to have low DOF motion on planar space, fabrication of control system is also simple. In this research, omni-directional wheels were adopted to remove the non-holonomic characteristic of conventional wheels and facilitate control system design. Firstly, geometric structure of a Mecanum wheel which is a most frequently used omni-directional wheel was demonstrated. Then, the organization of the mobile platform was suggested in aspects of mechanism manufacturing and electronic hardware design. Finally, a methodology of control system development was introduced for educational purpose. Due to an intuitive motion generating ability, simple hardware composition, and convenient control algorithm applicability, the omni-directional mobile robot suggested in this research is expected to be a promising educational platform.
A Study on the Torque Transmitting Capability of a Disk Coupling by Finite Element Analysis
Seo, Won Sang ; Kim, Sung Muk ; Kim, Jong-Bong ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1171~1177
DOI : 10.7736/KSPE.2013.30.11.1171
In this study, the torque transmitting capability of a flexible disk coupling was investigated. Flexible disc coupling is used to transmit power between two axes, and there exist mis-alignments such as angle of deviation and end play between two shafts. A disk is an important part in the flexible disk coupling because the disk has to transmit power between two mis-aligned shafts. To investigate the effect of mis-alignment on load carrying capacity, finite element analyses were carried out. Analyses were carried out for two types of disk; i.e., circular and square disks. The rotational and bending stiffness of disk plates was predicted to investigate the effect of mis-alignment on stress. As a result, it was shown that the mis-alignment can cause severe decrease in load-carrying capacity. And, the square disk showed better performance than the circular disk.
A Study on the Optimum Design of the Automotive Side Member to Maximize the Crash Energy Absorption Efficiency
Lee, Jung Hwan ; Jeong, Nak Tak ; Suh, Myung Won ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1179~1185
DOI : 10.7736/KSPE.2013.30.11.1179
In this study, the design optimization of the automotive side member is performed to maximize the crash energy absorption efficiency per unit weight. Design parameters which seriously influence on the frontal crash performance are selected through the sensitivity analysis using the Plackett-Burman design method. And also the design variables, which are determined from the sensitivity analysis, are optimized by two methods. One is conventional approximate optimization method which uses the statistical design of experiments (DOE) and response surface method (RSM). The other is a methodology derived from previous work by the authors, which is called sequential design of experiments (SDOE), to reduce a trial and error procedure and to find an appropriate condition for using micro-genetic algorithm. The proposed optimization technique shows that the automotive side member structure can be designed considering the frontal crash performance.
A Study on the Shift Motor Driving System Optimization of 4-WD Power Transformation Device
Youm, Kwang Wook ; Ham, Seong Hun ; Oh, Se Hoon ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1187~1192
DOI : 10.7736/KSPE.2013.30.11.1187
In the case of 4 wheel drive (4-WD) type car, power switching occurs to 4-WD by operating lever or switch that operates power switching device attached in transfer case which can operate motor by electric signal. So if the RPM of motor is high, power switching will not exactly occur and can cause damage to gear in transfer case according to circumstances. So in this study, we applied 2 level of planet gear type motor spindle of motor drive part of a power train. And conducted decelerating to increase torque to switch power safe and accurately. Also, we researched efficiency of gear by designing reduction gear ratio and gear type and by calculating contact stress and bending strength. Based on researched content, we made drive head of power switching device and a reduction module which uses type that uses motor spindle as sun gear and ring gear as cover.
Development of a Far Field type Megasonic for Nano Particle Removing
Lee, Yanglae ; Kim, Hyunse ; Lim, Euisu ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1193~1201
DOI : 10.7736/KSPE.2013.30.11.1193
Improved far field type(improved type) megasonic applicable to the cleaning equipment of single wafer processing type has been developed. In this study, to improve the uniformity of acoustic pressure distribution(APD), we utilize far field with relatively uniform APD, piezoelectric ceramic with a triangle hole in its center to prevent standing wave resulted from radial mode, and reflected wave from the wall of waveguide. On the basis of these methods, two analysis models of improved type were designed to which piezoelectric ceramic of different shape of electrode attached, and APD were analyzed by means of finite element method, and then one of them was selected by analysis results, finally, the selected model was fabricated. Test results show that the fabricated is better in the uniformity of APD than the imported and the conventional, also the fabricated shows high particle removal efficiency of 92.3% using DI water alone as a cleaning solution.
Dynamic Behavior Analysis of a Satellite Having Sandwich Panel by Utilizing Asymptotic Homogenization
Cho, Hee Keun ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1203~1210
DOI : 10.7736/KSPE.2013.30.11.1203
Korea's first Naro-Science small class satellite was launched by Naro launcher in 2013. The structure of the satellite is mostly composed of aluminum honeycomb and frame. The honeycomb structure is homogenized with asymptotic homogenization method and its mechanical properties were used for the numerical analysis. There have been some difficulties to modeling the honeycomb sandwich panels for FEA. In the present study, the mechanical characteristics of the sandwich panel composite were numerically computed and used for the simulation. This methodology makes it easy to overcome the weakness of modeling of complicated sandwich panels. Both an experiment of vibration test and numerical analyses were conducted simultaneously. The analysis results from the current homogenization were compared with that of experiment. It shows a good agreement on the dynamic responses and certified the reliability of the present methodology when manipulate sandwich panel structure.
A Dynamic Camera Actuation System for Simultaneous in Situ Image Acquisition on a Lab-on-a-disk
La, Moonwoo ; Park, Sang Min ; Park, Sung Jea ; Kim, Dong Sung ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1211~1216
DOI : 10.7736/KSPE.2013.30.11.1211
In this study, a dynamic camera actuation system for simultaneous in situ image acquisition is developed to achieve real-time observation of transient liquid flow on a lab-on-a-disk. A disk-type electric circuit, namely circuit-on-a-disk, co-rotated with the lab-on-a-disk improves the dynamic image acquisition ability in terms of a frame rate. The circuit-on-a-disk is comprised of a camera connected with a motor, a microprocessor and a wireless communication module. The camera connected with the motor enables to realize dynamic tracking of a transient flow and real-time image acquisition. The obtained images can be simultaneously transferred by a video/audio transmitter unit to a personal computer. Also, the microprocessor receives signals from the personal computer, and then controls the focusing position of the camera. We are expecting that heaters, sensors, and light sources also can be integrated on the circuit-on-a-disk, and they will enable various functional actuations as well as precise image acquisition.
Development of Hand Exoskeleton using Pneumatic Artificial Muscle Combined with Linkage
Koo, Inwook ; Kang, Brian Byunghyun ; Cho, Kyu-Jin ;
Journal of the Korean Society for Precision Engineering, volume 30, issue 11, 2013, Pages 1217~1224
DOI : 10.7736/KSPE.2013.30.11.1217
In this paper, a hand exoskeleton actuated by air muscles(soft hand exoskeleton) is introduced. Some soft hand exoskeletons have already been developed to overcome the defects of hand exoskeletons based on linkage and pneumatic piston system-they are usually bulky and do not have enough degree of freedom(DOF). However, soft hand exoskeletons still have defects. Their motions are not precise as linkage based hand exoskeletons, because their actuator, such as air muscle is made of soft materials. So we developed a new linkage which is not bulky and has redundant DOF. It is combined with air muscle in a specific way so that it acts as a guide when air muscle is actuated. Some experiments were conducted to evaluate the validity and usability of our hand exoskeleton.