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뿌리산업의 스마트 공장 구축을 위한 스마트 공장 패키지 S/W 구성 및 클라우드 기반 서비스 시스템
송기형(Ki Hyeong Song),정홍진(Hong Jin Jeong),이동윤(Dong Yoon Lee),김보현(Bo Hyun Kim) 한국생산제조학회 2020 한국생산제조학회지 Vol.29 No.4
The root industry is poorer than other industries in terms of manufacturing environment, including personnel, facility, budget, and information technology usage. For information systems in this industry, a packaged software is preferred for developing a customized software suitable for its manufacturing environment owing to the introduction time and software cost. This paper proposes a method for quick configuration of a package software, considering requirements of an SME in the root industry, and a service system for SMEs to enable package software access at any time and place. The key mechanism for configuring the package software involved classifying the software functions extracted by SMEs into three templates, according to the smartization level of SMEs. The cloud-based service system’s architecture was designed to configure the package software easily and manage its version, history, and users. Implementing the prototype service system revealed its usability and generated research issues that should be examined continuously.
Cutting Force Estimation Using Feed Motor Drive Current in Cutting Process Monitoring
송기형(Ki Hyeong Song),이동윤(Dong Yoon Lee),박경희(Kyung Hee Park),김재혁(Jae Hyeok Kim),최영재(Young Jae Choi) Korean Society for Precision Engineering 2020 한국정밀공학회지 Vol.37 No.11
The cutting force signal has traditionally served as a reference in conducting the monitoring studies using a variety of sensors to identify the cutting phenomena. There have been continuing studies on how to monitor the cutting force indirectly. It is because it is easier to access when considering an application to the actual machining site. This paper discusses a method of indirectly monitoring the cutting force using the feed drive current to analyze the change in the trend of the cutting force over the lapse of machining time. This enables the analysis of the cutting force by separating it in the X and Y axes of the machining plane. To increase the discrimination of the signal related to the actual cutting phenomenon from the feed drive current signal, a bandpass filter was applied based on the tooth passing frequency. The relationship between the feed drive current and the cutting force analyzed from the machining signal of actual machining conditions was applied to convert the feed drive current into the cutting force. It has been verified through experiments that the cutting load can be estimated with markedly high accuracy as a physical quantity of force from the feed motor current.
The State of the Art in Monitoring Technology of Machining Operations
송기형(Ki Hyeong Song),이동윤(Dong Yoon Lee) Korean Society for Precision Engineering 2018 한국정밀공학회지 Vol.35 No.3
Monitoring technology of machining operations has a long history since unmanned machining was introduced. Lots of research papers were presented and some of them has been commercialized and applied to shop floor. Despite the long history, many researchers have presented new approaches continuously in this area. This paper presents current state of monitoring technology of machining operations. The objectives of monitoring are shortly summarized, and the monitoring methods and the unique sensor technologies are reviewed. The main objective of the monitoring technology remains same; tool condition monitoring (TCM). The general approaches also remain similar; signal processing and decision making. But, the innovative methods for every step of process monitoring are being provided to improve the performance. More powerful computing is lowering the wall of much more data from more sensors by fast calculation. This technology also introduces the novel decision making strategies such as Artificial Intelligent. New materials and new communication technologies are breaking the limitation of sensor positions. Virtual machining technology which estimates the machining physics is being integrated with monitoring technology.
송기형(Ki-Hyeong Song),이동윤(Dong-Yoon Lee),박경희(Kyung-Hee Park),이석우(Seok-Woo Lee),김현철(Hyun-Cheol Kim),제태진(Tae-Jin Je) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.2
In order to cope with the requirements of smaller patterns, larger surfaces and lower costs in the fields of displays, optics and energy, greater attentions are now being paid to the development of micro-pattern machining technology. Compared with flat moulds, large drums with micro patterns (roll moulds) have the advantages of short delivery, ease of manufacturing larger surfaces, and continuous moulding. This paper introduced the machining process technology of the roll moulds for display industry. The environmental effects were discussed and the importance of temperature aintenance was experimentally emphasized. The real time monitoring system for micro machining was introduced. A commercial solution was used to simulate the micro grooving and a deformation model of micro machined pattern was finally introduced.
단결정 다이아몬드공구 제작 기술을 통한 초정밀 미세패턴 가공 연구
정성택,송기형,최영재,백승엽,Jung, Sung-Taek,Song, Ki-Hyeong,Choi, Young-Jae,Baek, Seung-Yub 한국금형공학회 2020 한국금형공학회지 Vol.14 No.3
As the consumer market in the VR(virtual reality) and the head-up display industry grows, the demand for 5-axis machines and grooving machines using on a ultra-precision machining increasing. In this paper, ultra-precision diamond tools satisfying the cutting edge width of 500 nm were developed through the process research of a focused ion beam. The material used in the experiment was a single-crystal diamond tool (SCD), and the equipment for machining the SCD used a focused ion beam. In order to reduce the influence of the Gaussian beam emitted from the focused ion beam, the lift-off process technology used in the semiconductor process was used. 2.9 ㎛ of Pt was coated on the surface of the diamond tool. The sub-micron tool with a cutting edge of 492.19 nm was manufactured through focused ion beam machining technology. Toshiba ULG-100C(H3) equipment was used to process fine-pattern using the manufactured ultra-precision diamond tool. The ultra-precision machining experiment was conducted according to the machining direction, and fine burrs were generated in the pattern in the forward direction. However, no burr occurred during reverse machining. The width of the processed pattern was 480 nm and the price of the pitch was confirmed to be 1 ㎛ As a result of machining.
최영재(Young Jae Choi),송기형(Ki Hyeong Song),이석우(Seok Woo Lee),최헌종(Hon Zong Choi) Korean Society for Precision Engineering 2014 한국정밀공학회지 Vol.31 No.3
Micro patterns are used to maximize the performance and efficiency of the product in many industries such as energy, display, printing, biology, etc. Nowadays, the fabrication technology for micro patterns has been developed in various ways such as photolithography, laser machining, electrical discharge machining and mechanical machining. Recently, mechanical machining the size of smaller than 1 micrometer could be tried, because the technology related to the machining was developed brilliantly. This paper shows the experiments using cutting processes in order to fabricate the micro pattern. Micro patterns of the size of several micrometers were machined by the diamond tools of two different shape, the deformation and generation of burr were investigated.
CNC 기계의 원격 에너지 모니터링을 위한 온라인 시스템 구조
남성호(Sung-Ho Nam),송기형(Ki-Hyeong Song),백재용(Jae-Yong Baek),이동윤(Dong-Yoon Lee),류광열(Kwang-Yeol Ryu) Korean Society for Precision Engineering 2013 한국정밀공학회지 Vol.30 No.5
Enhancing energy efficiency of machine tools causes substantial impacts on the manufacturing industries, to cope with the competitive introduction of the total energy management strategies. Real-time energy monitoring is essential to identify energy consumption patterns of the machine tools and correlate them with the energy management strategy. Integrated analysis of machine tool’s operation status and the corresponding energy usage is most important to accurately evaluate the energy efficiency under the various machining process environments. This paper proposes a system architecture to realize the online energy monitoring system and the embedded energy monitoring approach interconnected with the CNC kernel. The shop-floor operation management system is presented to integrate the proposed online energy monitoring approach.
사출성형 유동해석 서비스 납기단축을 위한 프로세스 개발
이동윤(Dong-yoon Lee),송기형(Ki-hyeong Song),최영재(Young-jae Choi),이석우(Seok-woo Lee),최헌종(Hon-zong Choi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
The importance of simulation of plastic flow in the injection mold is increasing as the parts are more complex, but the small-scale enterprises can’t afford to invest for the infra individually. CAE (Computer Aided Engineering) service was naturally born based on these needs. This paper presents the engineering collaboration model between the large and the small/medium enterprises in the field of injection molds. Based on the engineering collaboration hub and CAE service, small-scale enterprises could research the necessary technology and develop the proper products. The analysis results of CAE are provided by the integrated visualization system on the web. This paper also deals with the delivery shorting process of CAE service for electric/electronic parts which should meet the needs of customers as soon as possible.
공구 중심점의 변위 최소화를 위한 문형 공작기계의 크로스레일 개선 연구
이명규(Myung-Gyu Lee),송기형(Ki-Hyeong Song),최학봉(Hag-Bong Choi),이동윤(Dong-Yoon Lee) 한국생산제조학회 2011 한국생산제조학회지 Vol.20 No.3
General portal machine represents a distinct weak spot concerning their structural behavior because of long protruding structure components, such as saddles and rams. The weak point causes the deformation of the machine tool and consequently rises a severe machining error. The purpose of this study is to improve the structural design of crossrail in order to minimize it’s distortion. Tool Center Point (TCP) was chosen as a reference point for evaluating the distortion effect of a crossrail and topological optimization was adopted as a method of structural design improvement. The displacements of TCP according to the machining positions were investigated by structural analyses for both of original crossrail design and the improved one. The comparing results showed that the displacement of TCP could be reduced about 55% maximum.
초음파 진동을 하는 다이아몬드 연삭공구의 알루미나 세라믹 연삭 가공에 관한 연구
최영재(Young-Jae Choi),송기형(Ki-Hyeong Song),박경희(Kyung-Hee Park),홍윤혁(Yun-Hyuck Hong),김경태(Kyeong-Tae Kim),이석우(Seok-Woo Lee),최헌종(Hon-Zong Choi) 한국기계가공학회 2012 한국기계가공학회지 Vol.11 No.1
In this study, ultrasonic vibration tool designed and made by using FEM analysis. And machining test was carried out in various machining conditions using ultrasonic vibration capable CNC machine. For work material, alumina ceramic (Al₂O₃) was used while for tool material diamond electroplated grinding wheel was used. To evaluate ultrasonic vibration effect, grinding test was performed with and without ultrasonic vibration in same machining condition. In ultrasonic mode, ultrasonic vibration of 20㎑ was generated by HSK 63 ultrasonic actuator. The two grinding speeds, 1.67㎧ and 3.35㎧, were applied. On the other hand, grinding forces were measured by KISTLER dynamometer.