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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
Selecting the target year
Smart Compensation for Chatter Control of Machine-Tool
Kim, Dong-Hong ; Song, Jun-Yeob ; Koh, Dong-Yeon ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 9~16
DOI : 10.7736/KSPE.2015.32.1.9
The machining-chatter stands for a sudden relative vibration appeared between a material and a tool while processing with a machine. This chatter is key factor that seriously affects the quality of processed materials as well as being a factor which causes serious damages to the tool and the machine. This study is related to the monitoring and smart control of chatter problem that can compensate machining-chatter faster and produce processed goods with more precision by autonomous compensation. The above-mentioned machining-chatter compensator includes the chatter vibration sensor and the chatter compensator that estimates the compensation value according to the sensor detecting the chatter vibration of machine-tool and the chatter vibration detected from the sensor while having a feature of being organized by interlocking with the machine-tool controller.
The System Architecture and Standardzation of Production IT Convergence for Smart Factory
Cha, Suk Keun ; Yoon, Jae Young ; Hong, Jeong Ki ; Kang, Hyun Gu ; Cho, Hyeon Chan ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 17~24
DOI : 10.7736/KSPE.2015.32.1.17
Smart factory requires 4 Zero factors including Zero Waiting-time, Zero Inventory, Zero Defect, Zero Down-time) that needs IT convergence for production resources of 4M1E(Man, Machine, Material, Method, Energy) in real time and event processing in all type of manufacturing enterprises. This paper will be explaining about core emerging production IT convergence technologies including cyber device security, 4M1E integration, real time event driven architecture, common platform of manufacturing standard applications, smart factory to-be model for small and medium manufacturing enterprises.
Decision Tree based Scheduling for Static and Dynamic Flexible Job Shops with Multiple Process Plans
Yu, Jae-Min ; Doh, Hyoung-Ho ; Kwon, Yong-Ju ; Shin, Jeong-Hoon ; Kim, Hyung-Won ; Nam, Sung-Ho ; Lee, Dong-Ho ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 25~37
DOI : 10.7736/KSPE.2015.32.1.25
This paper suggests a decision tree based approach for flexible job shop scheduling with multiple process plans. The problem is to determine the operation/machine pairs and the sequence of the jobs assigned to each machine. Two decision tree based scheduling mechanisms are developed for static and dynamic flexible job shops. In the static case, all jobs are given in advance and the decision tree is used to select a priority dispatching rule to process all the jobs. Also, in the dynamic case, the jobs arrive over time and the decision tree, updated regularly, is used to select a priority rule in real-time according to a rescheduling strategy. The two decision tree based mechanisms were applied to a flexible job shop case with reconfigurable manufacturing cells and a conventional job shop, and the results are reported for various system performance measures.
A Smart Machining System
Park, Hong-Seok ; Tran, Ngoc-Hien ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 39~47
DOI : 10.7736/KSPE.2015.32.1.39
Globalization, unpredictable markets, increased products customization and frequent changes in products, production technologies and machining systems have become a complexity in today's manufacturing environment. One key strategy for coping with the evolution of this situation is to develop or apply an enable technology such as intelligent manufacturing. Intelligent manufacturing system (IMS) is characterized by decentralized, distributed, networked compositions of heterogeneous and autonomous systems. The model of IMS is inherited from the organization of the living systems in biology and nature so that the manufacturing system has the advanced characteristics inspired from biology such as self-adaptation, self-diagnosis, and selfhealing. To prove this concept, an innovative system with applying the advanced information and communication technology such as internet of things, cognitive agent are proposed to integrate, organize and allocate the machining resources. Innovative system is essential for modern machining system to flexibly and quickly adapt to new challenges of manufacturing environment.
The Effect of Surface Roughness according to Machining Conditions of Test Specimen for Precision Micro-milling Machining
Sim, Min-Seop ; Kim, Dong-Hyeon ; Lee, Choon-Man ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 49~55
DOI : 10.7736/KSPE.2015.32.1.49
Recently, many researchers and industry are looking for ways to decrease the use of lubricants because of economical and environmental reasons. One of the lubrication technologies is the MQL method. This study presents a research of MQL and Wet milling processes of Al 6061 material. For this experiment, the test specimen is suggested, and various machining conditions are applied. And, shape of micro-pattern which has been recently spotlighted is included in the test specimen. In order to compare MQL with Wet machining, several milling experiments were carried out, varying feed rate, cutting speed, depth of cut, etc. Finally, the surface roughness results of machining tests according to the process conditions were measured. It is expected that the results of machining experiments can be used to predict the surface roughness of various MQL milling processes.
A Study on the Analysis of 20,000rpm Heavy-Cutting Spindle for Precision Machining
Oh, Nam-Seok ; Kim, Dong-Hyeon ; Lee, Choon-Man ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 57~61
DOI : 10.7736/KSPE.2015.32.1.57
A spindle unit is very important in machine tools. It has a direct effect on machining accuracy. The static and dynamic characteristics of the spindle unit should be considered in the initial design stage for manufacturing of precision product. This study describes an investigation for deriving design stability of a 20,000rpm heavy-cutting spindle for precision machining. Static and dynamic characteristics of the spindle, such as deformation, stress, natural frequency and mode shapes are analyzed using finite element analysis. The 20,000rpm heavy-cutting spindle is confirmed that it is successfully designed through finite element analysis.
A Study on Manufacturing Method of Nano-Micro Hybrid Pattern Using Indentation Machining Method and AAO Process
Kim, Han-Hee ; Jeon, Eun-Chae ; Choi, Dae-Hee ; Jang, Woong-Ki ; Park, Yong-Min ; Je, Tae-Jin ; Choi, Doo-Sun ; Kim, Byeong-Hee ; Seo, Young-Ho ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 63~68
DOI : 10.7736/KSPE.2015.32.1.63
Micro/nano patterns for optical concentration and diffusion have been studied in the various fields such as displays, optics, and sensors. Conventional micro patterns were continuous and linear shapes due to using linear-type light sources, however, recently non-continuous patterns have been applied as point sources are used for dot-type light sources such as LEDs and OLEDs. In this study, a hybrid machining technology combining an indentation machining method and an AAO process was developed for manufacturing the non-continuous micro patterns having nano patterns. First, mirror-like surfaces (
) of pure Aluminum substrates were obtained by optimizing cutting conditions. Then, The letter of 'K' consisting of the arrays of the micro patterns was manufactured by the indentation machining method which has a similar principle to indentation hardness testing. Finally, nano patterns were machined by AAO process on the micro patterns. Conclusively, a specific letter having nano-micro hybrid patterns was manufactured in this study.
Effect of Oxidizer on the Polishing in Cadmium Telluride CMP
Shin, Byeong Cheol ; Lee, Chang Suk ; Jeong, Hae Do ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 69~74
DOI : 10.7736/KSPE.2015.32.1.69
Cadmium telluride (CdTe) is being developed for thin film of the X-Ray detector recently. But a rough surface of the CdTe should be improved for resolution and signal speed. This paper shows the study on the improvement of surface roughness and removal rate by applying Chemical Mechanical Polishing. The conventional potassium hydroxide (KOH) based colloidal silica slurry could not realize a mirror surface without physical defects, resulting in low material removal rate and many scratches on surface. In order to enhance chemical reaction such as form oxidized layer on the surface of cadmium telluride, we used hydrogen peroxide (
) as an oxidizer. Consequently, in case of 3 wt% concentration of hydrogen peroxide, the highest MRR (938 nm/min) and the lowest surface roughness (
) could be obtained. EDS was also used to confirm the generated oxide of cadmium telluride surface.
Modeling and Analysis of a Ray Tracing Method for Non-Destructive Testing for Internal Defects
Kim, Teak Gu ; Kim, Joohan ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 75~81
DOI : 10.7736/KSPE.2015.32.1.75
Modeling and analysis using a ray tracing method for internal defects were described. Reflection and refraction of rays on the interface of defects were modeled using the Harvey model and the Lambertian model. The diffraction on the interface of defects affected the incoming signals and it could evaluate any defects in the matter and its signal would be analyzed with the ray tracing simulation. The simulation results were compared with actual detecting signals and the ray tracing model was shown in good agreement with experimental data. This method has a possibility to be used as wave propagation modeling in non-destructive testing.
Evaluation of Design Variants of Drive Mechanisms for a Neck Massager based on a Simplified Criterion
Park, Jung Hyun ; Kim, Kwon Hee ; Chae, Soo Won ; Cho, Chang Hee ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 83~88
DOI : 10.7736/KSPE.2015.32.1.83
At the early stages of engineering design, a number of design concepts may be suggested. With a great degree of freedom, making a good choice may be a challenge at this stage. In this study, a simplified evaluation criterion for design concepts is presented based on cost, simplicity and safety. Cost is estimated by the amount of materials and the required level of tolerance. Simplicity is represented by the number of parts, assembly steps, and fasteners. Safety is assessed by the level of potential failure. The proposed criterion is applied to an example design of driving mechanisms for cervical vertebrae massage machine.
Kinematics Analysis of a 5-Axis Ultrasonic Inspection Equipment
Han, Myung-Chul ; Sung, Chang-Min ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 89~96
DOI : 10.7736/KSPE.2015.32.1.89
In this paper, it is studied that kinematic analysis of a 5-axis ultrasonic inspection equipment. The equipment is comprised of three straight axes and two rotary axes. With features of ultrasonic, the transmitter and receiver of the equipment are vertical to a test surface, operating at regular intervals. To perform this well, the motions of every link should be found on the based of kinematic analysis of the equipment. We chose starting point for testing and defined relations among all links through transformation of coordinates. For double curvature-shaped test object, we generated test paths. To follow these, we found motions of all links using inverse kinematics. By using Matlab/Simulink, simulator was developed, so that we could find out desired trajectories of main axes for a scan.
Design, Fabrication and Analysis of Walking Robot Based on Origami Structure
Kim, Tae-Yeon ; Lee, Seok-Hun ; Lee, Gi-Jung ; Lee, Dae-Young ; Kim, Ji-Suk ; Cho, Kyu-Jin ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 97~105
DOI : 10.7736/KSPE.2015.32.1.97
Recently, there have been many researches about applications of origami to mechanical engineering, which realizes a 30 sturcture by folding a 20 plane material. With this simple manufacturing process, origami was even adopted by some roboticists as a way to build an entirely new robot with benefits in terms of cost, weight, and structural simplicity In this paper, we propose a new type of a walking robot based on origami structure. Because all the components of the robot that generate gait motion are mechanically connected, it can actually walk fotward with only a single actuator. We also showed the similarity of gait trajectories between a kinematic analysis and the actual gait motion measured by video tracking. This result proved the possibility of designing an origami-based robot with the identical gait trajectory as we plan.
Optimal Design for Parallelogram Type Flexure Hinge
Choi, Ju Yong ; Eom, Sang In ; Kim, Jung Hyun ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 107~111
DOI : 10.7736/KSPE.2015.32.1.107
This paper proposes an optimal design for a precision motion stage employing a parallelogram flexure hinge. The voltage applied to the piezo element produces motion that is amplified through a 3-stage amplification structure. Especially, instead of the generally used conic section flexure hinge a parallelogram shaped flexure hinge is used that improves the flexibility of the lever. An Finite Element Analysis is performed on each motion stage lever where optimal design was achieved using Response Surface Methodology(RSM).
Measurement of Geometric Properties of Printed Patterns and Evaluation of their Printability
Jeon, Sung Woong ; Kim, Cheol ; Park, Jong-Chan ; Kim, Dong Soo ; Kim, Chung Hwan ;
Journal of the Korean Society for Precision Engineering, volume 32, issue 1, 2015, Pages 113~113
DOI : 10.7736/KSPE.2015.32.1.113