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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Precision Engineering
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Journal DOI :
Korean Society of Precision Engineering
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Volume & Issues
Volume 32, Issue 12 - Dec 2015
Volume 32, Issue 11 - Nov 2015
Volume 32, Issue 10 - Oct 2015
Volume 32, Issue 9 - Sep 2015
Volume 32, Issue 8 - Aug 2015
Volume 32, Issue 7 - Jul 2015
Volume 32, Issue 6 - Jun 2015
Volume 32, Issue 5 - May 2015
Volume 32, Issue 4 - Apr 2015
Volume 32, Issue 3 - Mar 2015
Volume 32, Issue 2 - Feb 2015
Volume 32, Issue 1 - Jan 2015
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Prediction of Machine Tool's Energy Consumption during the Cutting Process
Lee, Chan-Hong ; Hwang, Jooho ; Heo, Segon ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 329~337
DOI : 10.7736/KSPE.2015.32.4.329
In this paper, a simulation based estimation method of energy consumption of the spindle and feed drives for the NC machine tool during the cutting process is proposed. To predict energy consumption of the feed drive system, position, velocity, acceleration and jerk of the table are analyzed based on NC data and then the power and energy are calculated considering friction force and mass of the stages. Energy consumption of the spindle is estimated based on models from acceleration motion of rotating parts, friction torque and power loss of motors. Moreover, simulation models of cutting power and energy for the material removal along the NC tool paths are proposed.
Energy Consumption Monitoring System for Each Axis of Machining Center
Kim, Jae Hyeok ; Nam, Sung Ho ; Lee, Dong Yoon ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 339~344
DOI : 10.7736/KSPE.2015.32.4.339
Machine tools are one of the energy-intensive equipment used in the manufacturing industry. The importance of energy has increased and the machine tools are required to be energy-efficient. The servo systems of the machine tool consume electrical power to rotate a spindle and to feed a tool during machining. Servo system consumes a lot of energy when the machine tool is operated. The energy consumption pattern of each axis needs to be investigated in order to optimize the machining process with regard to energy cost. In this paper, an energy monitoring system is developed considering various measuring points of servo system in order to grasp the energy consumption pattern of each axis.
Energy Saving Algorithms for Cooling Systems in Machine Tools
Kim, Taejung ; Kim, Taeho ; Jee, Sungchul ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 345~351
DOI : 10.7736/KSPE.2015.32.4.345
Machine tools usually consume more energy in cooling systems than in spindle motors. This is largely because circulation pumps in the cooling systems are continuously powered to measure the temperature of spindle motors. In this paper, energy saving algorithms are proposed, which modify this behavior of the circulation pumps in such a way that the circulation pumps run only when it is likely that the information on the temperature is critical to bang-bang control of compressors in cooling systems. A mathematical model is established that explains heat transfer phenomena near the spindle motors. The power consumptions are measured for individual components in a machine tool, and the parameters that appear in the mathematical model are estimated. Computer simulations are performed with the estimated parameters, and the results are compared with the experimental ones. It turns out that a large amount of energy can be saved by using the proposed method.
Prediction of Consumed Electric Power on a MQL Milling Process using a Kriging Meta-Model
Jang, Duk-Yong ; Jung, Jeehyun ; Seok, Jongwon ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 353~358
DOI : 10.7736/KSPE.2015.32.4.353
Energy consumption reduction has become an important key word in manufacturing that can be achieved through the efficient and optimal use of raw materials and natural resources, and minimization of the harmful effects on nature or human society. The successful implementation of this concept can only be possible by considering a product's entire life cycle and even its disposal from the early design stage. To accomplish this idea with milling, minimum quantity lubrication (MQL) strategies and cutting conditions are analyzed through process modeling and experiments. In this study, a model to predict the cutting energy in the milling process is used to find the cutting conditions, which minimize the cutting energy through a Kriging meta-modeling process. The MQL scheme is developed first to reduce the amount of cutting oil and costs used in the cutting process, which is then employed for the entire modeling and experiments.
Design of a Six-Axis Force/Moment Sensor using Analytical Method for Humanoid Robot Foot Module
Yuan, Chao ; Lim, Dong Hwan ; Luo, Lu Ping ; Han, Chang Soo ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 359~367
DOI : 10.7736/KSPE.2015.32.4.359
The forces and moments exerted on humanoid robot foot are important information for controlling or monitoring the robot. Multi-axis force/moment sensor can be installed under humanoid robot foot to measure forces and moments. The sensor should have large stiffness to support the robot weight and small size not to disturb the motion of the robot. In this paper, we designed a 6-aixs force/moment sensor which has good accuracy, large measuring range, and new compact structure. In addition, the proposed sensor is evaluated using analytical method and FEM(Finite Elements Method) method. Finally, it turned out that it has good performance.
Study on the Highly Viscous Fluid Ejection Pressure of Magnetostrictive Inkjet Head
Oh, Ock Kyun ; Park, Young-Woo ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 369~375
DOI : 10.7736/KSPE.2015.32.4.369
This paper presents ejection of high viscosity fluids with magnetostrictive inkjet printhead(Magjet), which is not common with any other printhead. The MagJet uses a magnetostrictive material, Terfenol-D rod with 10-mm in diameter and 50-mm in length, as an actuation mechanism. It has been known that high viscosity is often an obstacle in ejecting small and mono-disperse droplets. We calculated required pressure with fluidic inertia (Bernoulli equation) and viscous loss (Hagen Poiseuille equation). The required pressure for ejecting a droplet is 1300kPa. The generated force and displacement with Terfenol-D rod are estimated to be 480N (2600kPa) and
, respectively. It was enough that Magjet eject high viscosity fluid (Max 1000cP). The experiments are performed to eject the high viscosity fluid with Magjet. The ejection of high viscosity fluids is successful with the aid of Terfenol-D's high performance.
Inertial Motion Sensing-Based Estimation of Ground Reaction Forces during Squat Motion
Min, Seojung ; Kim, Jung ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 377~386
DOI : 10.7736/KSPE.2015.32.4.377
Joint force/torque estimation by inverse dynamics is a traditional tool in biomechanical studies. Conventionally for this, kinematic data of human body is obtained by motion capture cameras, of which the bulkiness and occlusion problem make it hard to capture a broad range of movement. As an alternative, inertial motion sensing using cheap and small inertial sensors has been studied recently. In this research, the performance of inertial motion sensing especially to calculate inverse dynamics is studied. Kinematic data from inertial motion sensors is used to calculate ground reaction force (GRF), which is compared to the force plate readings (ground truth) and additionally to the estimation result from optical method. The GRF estimation result showed high correlation and low normalized RMSE(R=0.93, normalized RMSE<0.02 of body weight), which performed even better than conventional optical method. This result guarantees enough accuracy of inertial motion sensing to be used in inverse dynamics analysis.
Analysis of Heat Generation Induced by Electron Impact in X-Ray Tube Using FEM and Monte Carlo Method
Kim, Heungbae ; Yoo, Tae Jae ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 4, 2015, Pages 387~394
DOI : 10.7736/KSPE.2015.32.4.387
We analyze heat generation as well as temperature distribution induced by accelerated electron impact on a target in a closed x-ray tube. For the sake of accuracy, we use Monte carlo analysis. This method gives accurate energy deposit in a medium with additional information such as secondary and backscattered electron as well as their paths. A Tungsten coated layer is divided by small rectangular cell which accumulate energy loss of primary electron beam. The cells and their accumulated energy datum are used for the input of finite element analysis. The Maximum temperature rising and temperature distribution were analyzed by transient heat analysis. Some temperature parameters such as target size and coating thickness were varied to investigate temperature sensitivity. Temperatures were compared each other to find primary variable that affect temperature rising on the x-ray target. The results will be helpful in development highresolution x-ray tube and related industries.