• 제목/요약/키워드: Tool Condition Monitoring

검색결과 179건 처리시간 0.031초

정상 압연 구간의 특징을 이용한 판 파단의 상태감시 (Condition Monitoring for Coil Break Using Features of Stationary Rolling Region)

  • 오준석;양승욱;심민찬;와휴 세사렌드라;양보석;이원호
    • 한국소음진동공학회논문집
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    • 제19권12호
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    • pp.1252-1259
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    • 2009
  • Due to the international competition and global pressure, the roll speed is increased. However, higher speeds increase the power density in the process as well as the plant's potential to react with vibrations. Under certain operating conditions, vibrations may occur, which again cause chattermarks, strip rupture or coil break fault. The appropriate condition monitoring is needed to improve product quality and availability. The aim of condition monitoring is to reduce maintenance costs, increase productivity and improve product quality. This paper proposes a condition monitoring tool designed for the classification of coil break fault. This method is used to cold rolling mill for faults monitoring based on vibration and motor current signals. The results show that the performance of classification has high accuracy based on experimental work.

절삭력 간접 측정을 통한 웹기반 금형가공공정 감시 시스템 (Web-based Monitoring System for Mold Manufacturing Process by Indirect Measurement of Cutting Force)

  • 김건희;신봉철;최진화;신광호;윤길상;조명우
    • 소성∙가공
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    • 제15권1호
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    • pp.82-88
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    • 2006
  • In this paper, the web-based monitoring system is developed for the effective process monitoring of mold manufacturing using web. In developed system, the cutting force for monitoring the manufacturing condition is measured using hall-sensor that is low cost and useful to be installed in a machine tool indirectly. Specially, the current of main spindle in a machine tool is converted into cutting force by various experiments. For effective web-based monitoring, the program which runs in the local computer of client is made to exchange message between a server and a client by making of ActiveX control and the result of manufacturing is shown on web-browser by Ch language. The developed system in this study is the foundation of establishing E-manufacturing in mold factory.

ART2 신경회로망을 이용한 공작기계의 웹기반 원격 성능저하 모니터링 시스템 개발 (Development of a Web-Based Remote Monitoring System for Evaluating Degradation of Machine Tools Using ART2)

  • 김초원;최국진;정성환;홍대선
    • 한국공작기계학회논문집
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    • 제18권1호
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    • pp.42-49
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    • 2009
  • This study proposes a web-based remote monitoring system for evaluating degradation of machine tools using ART2(Adaptive Resonance Theory 2) neural network. A number of studies on the monitoring of machine tools using neural networks have been reported. However, when normal condition is changed due to factors such as maintenance, tool change etc., or a new failure signal is generated, such algorithms need to be entirely retrained in order to accommodate the new signals. To cope with such problems, this study develops a remote monitoring system using ART2 in which new signals when required are simply added to the classes previously trained. This system can monitor degradation as well as failure of machine tools. To show the effectiveness of the proposed approach, the system is experimentally applied to monitoring a simulator similar to the main spindle of a machine tool, and the results show that the proposed system can be extended to monitoring of real industrial machine tools and equipment.

공구마멸에 따른 절삭력의 RMS특성 (The RMS Characteristics of Cutting Force Depending on the Tool Wear)

  • 권용기;오석형;김동현
    • 대한기계학회논문집
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    • 제17권9호
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    • pp.2214-2222
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    • 1993
  • With the use of the NC machine tool, the unmanned production system has been growing recently in the manufacturing field. This there are problems with monitoring adequate tool fracture during the cutting process efficiently. This study was planned and carried out to discover a way of monitoring tool condition in NO-LINE systems during the cutting process. The acquisition of data in cutting force and tool wear has been made in the section examined, to extract the RMS value of the cutting force as specific factors in the cutting process. The fluctuation of the RMS characteristics. From the results, it has been shown that the fluctuation of the RMS values for the cutting force has a close relation to flank wear.

MONITORING OF LAND-COVER MOISTURE USING MULTITEMPORAL SAR IMAGES

  • Yoon, Bo-Yeol;Lee, Kwang-Jae;Kim, Youn-Soo;Kim, Yong-Seung
    • 대한원격탐사학회:학술대회논문집
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    • 대한원격탐사학회 2006년도 Proceedings of ISRS 2006 PORSEC Volume II
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    • pp.888-891
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    • 2006
  • SAR image is not dependent on the weather condition and Sun's electromagnetic energy. But geometric distortions exist in almost all radar image, it need to be correction. The Radarsat-1 SAR images are used to monitoring of moisture acquired in May 1/1998 and May 25/1998. Radarsat-1 C band data is sensitive on moisture condition. Study area is located in Non-san site. It is made up almost agricultural area and a little of forest area. In May, Rice-planting is started in the midland of Korea. So moisture condition is undergoing many changes. Forest area need to be terrain effect removal for accurately results because it is included in layover, shadow, and so on. Results of land-cover moisture condition map are useful tool for fields of agriculture, forestry industry, and disaster.

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Monitoring of Land-Cover Moisture Using Multi-Temporal Sar Images

  • Yoon, Bo-Yeol;Lee, Kwang-Jae;Kim, Youn-Soo;Kim, Yong-Seung
    • 대한원격탐사학회지
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    • 제22권5호
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    • pp.433-437
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    • 2006
  • SAR image is not dependent on the weather condition and Sun's electromagnetic energy. But geometric distortions exist in almost all radar image, it need to be correction. The Radarsat-1 SAR images are used to monitoring of moisture acquired in May 1/1998 and May 25/1998. Radarsat-1 C band data is sensitive on moisture condition. Study area is located in Non-san site. It is made up almost agricultural area and a little of forest area. In May, Rice-planting is started in the midland of Korea. So moisture condition is undergoing many changes. Forest area need to be terrain effect removal for accurately results because it is included in layover, shadow, and so on. Results of land-cover moisture condition map are useful tool for fields of agriculture, forestry industry, and disaster.

다이아몬드 코어 드릴의 마멸 검출에 관한 연구 (A Study on the Wear Monitoring Technique for Diamond Core Drill)

  • 유봉환
    • 한국생산제조학회지
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    • 제4권2호
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    • pp.38-45
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    • 1995
  • The diagnosis and monitoring system of abnormal cutting condition is necessary to realize precision machining proces and factory automation, which are final goal of metal cutting in order to develop this system, theimage processing technique has been investigated in machining process. In theis paper, the measurement system of tool wear using computer vision is designed to detect the wear pattern by non-contact and direct method and get the realiable wear information about cutting tool. We measured the area of the side and front part of the diamond core dril which is used in 40kHz ultrasonic vibration machine.

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Windows NT 기반의 회전 기계 진동 모니터링 시스템 개발 (Development of Rotating Machine Vibration Condition Monitoring System based upon Windows NT)

  • 김창구;홍성호;기석호;기창두
    • 한국정밀공학회지
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    • 제17권7호
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    • pp.98-105
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    • 2000
  • In this study, we developed rotating machine vibration condition monitoring system based upon Windows NT and DSP Board. Developed system includes signal analysis module, trend monitoring and simple diagnosis using threshold value. Trend analysis and report generation are offered with database management tool which was developed in MS-ACCESS environment. Post-processor, based upon Matlab, is developed for vibration signal analysis and fault detection using statistical pattern recognition scheme based upon Bayes discrimination rule and neural networks. Concerning to Bayes discrimination rule, the developed system contains the linear discrimination rule with common covariance matrices and the quadratic discrimination rule under different covariance matrices. Also the system contains k-nearest neighbor method to directly estimate a posterior probability of each class. The result of case studies with the data acquired from Pyung-tak LNG pump and experimental setup show that the system developed in this research is very effective and useful.

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초경합금의 미세방전 드릴링에 관한 연구 (A Study on Micro ED-Drilling of cemented carbide)

  • 김창호;강수호
    • 한국기계가공학회지
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    • 제9권5호
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    • pp.1-6
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    • 2010
  • The wavelet transform is a popular tool for studying intermittent and localized phenomena in signals. In this study the wavelet transform of cutting force signals was conducted for the detection of a tool failure in turning process. We used the Daubechies wavelet analyzing function to detect a sudden change in cutting signal level. A preliminary stepped workpiece which had intentionally a hard condition was cut by the inserted cermet tool and a tool dynamometer obtained cutting force signals. From the results of the wavelet transform, the obtained signals were divided into approximation terms and detailed terms. At tool failure, the approximation signals were suddenly increased and the detailed signals were extremely oscillated just before tool failure.

윈도우즈 환경하에서의 Distributed NC 및 공구관리 시스템 (Distributed NC with Tool Managenent System Under the Windows Environment)

  • 은율;신동수;정성종
    • 한국정밀공학회:학술대회논문집
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    • 한국정밀공학회 1993년도 추계학술대회 논문집
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    • pp.411-416
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    • 1993
  • In order to achieve computer-oriented control and automation of manufacturing processec, a distributed NC (DNC_) system was developed for FMS under the Windows environment. The DNC system consists of conventional DNC, PMC interface and tool management modules. Real-time system conditon monitoring and control fuctions required for machine tools and machining processes were accomplished by developing a PMC interface module called MMC board. Tool condition monitoring and management was performed by the developed tool management module composed of a tool setting probe and softwares. Performance of the DNC system was confirmed on the horizontal and the vertical type machining center equipped with FANUC OMC for the large amount of experiments.

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