• Title, Summary, Keyword: Process Monitoring System

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Development of ELID Monitoring System and its Application to ELID Grinding of Structural Ceramics (ELID 연삭 모니터링 시스템의 개발과 구조 세라믹스 적용 사례)

  • Kwak, Tae-Soo;Kim, Gyung-Nyun;Kwak, Ihn-Sil
    • Journal of the Korean Society for Precision Engineering
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    • v.30 no.12
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    • pp.1245-1251
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    • 2013
  • This study has focused on development of ELID monitoring system and its application to ELID grinding of structural ceramics. ELID monitoring system was consisted of grinding equipment, ELID power supply, grinding wheel, electrode and monitoring program. It can give a real time data to check spindle grinding resistance, wheel revolution, dressing current and voltage in ELID grinding process. The performance of developed system was evaluated by applying to grinding of structural ceramics, silicon carbide and alumina. As the results of experiments, monitored data for spindle resistance and ELID dressing current was useful to check steady-state ELID grinding process. From the comparison of spindle resistance between ELID grinding and conventional grinding process according to change of depth of cut, it could be confirmed that the spindle resistance in ELID grinding was lower than conventional grinding process.

Real-time Chemical Monitoring System using RGB Sensor toward PCB Manufacturing (PCB 제조공정을 위한 화학약품 용액의 실시간 모니터링 시스템)

  • An, Jong-Hwan;Lee, Seok-Jun;Kim, Lee-Chui;Hong, Sang-Jeen
    • Journal of the Korean Institute of Electrical and Electronic Material Engineers
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    • v.21 no.5
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    • pp.397-401
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    • 2008
  • Most of the topic in PCB industry was about increasing the volume of product for the development of electronics in numerous industrial application area. However, it has been emerged that yield improvement quality manufacturing via detecting any suspicious process in order to minimize the scrapped product and material waste. In addition, recently, restriction of hazardous substances (RoHS) claims that electronic manufacturing environment should reduce the harmful chemicals usage, thus the importance of monitoring copper etchant and detecting any mis-processing is crucial for electronics manufacturing. In this paper, we have developed real-time chemical monitoring system using RGB sensor, which is simpler but more accurate method than commercially utilized oxidation reduction potential (ORP) technique. The developed Cu etchant monitoring system can further be utilized for copper interconnect process in future nano-semiconductor process.

Development of Acoustic Emission Monitoring System for Fine Machining - Application to Cutting State Monitoring in a Fine Fixed-abrasive Machining - (미세 음향방출 감시장치 개발 - 고정도 미세입자 가공상태 감시에의 적용 -)

  • Kim Hwa Young;Ahn Jung Hwan;Kim Sung Ryul
    • Journal of the Korean Society for Precision Engineering
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    • v.22 no.6
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    • pp.109-117
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    • 2005
  • In case of fine machining processes, the cutting state monitoring by a skilled operator is impossible because the physical changes generated during fine machining are very weak. To realize the high efficient and precise fine machining, it is necessary to develop the sensor based monitoring system which is able to detect the fine changes of cutting state. In this paper, the fine acoustic emission monitoring system is developed to monitor the state of the fine machining process. The developed system consists of the AE sensor and the AE signal processing unit. And this has the high-sensitivity and bandwidth which can detect fine AE signal generated during fine machining process. In order to investigate the feasibility of the developed system, evaluation experiments were performed in the fine fixed-abrasive machining processes such as polishing and glass ferrule slicing. Experimental results show that the developed monitoring system possesses an excellent real-time monitoring capability at fine machining processes.

Tool Breakage Detection Using Feed Motor Current (이송모터 전류신호를 이용한 공구파손 검출)

  • Jeong, Young Hun
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.6
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    • pp.1-6
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    • 2015
  • Tool condition monitoring plays one of the most important roles in the improvement of both machining quality and productivity. In this regard, various process signals and monitoring methods have been developed. However, most of the existing studies used cutting force or acoustic emission signals, which posed risks of interference with the machining system in dynamics, fixturing, and machining configuration. In this study, a feed motor current signal is used as a process signal representing process and tool states in tool breakage monitoring based on an adaptive autoregressive model and unsupervised neural network. From the experimental results using various cases of tool breakage, it is shown that the developed system can successfully detect tool breakage before two revolutions of the spindle after tool breakage.

Introduction to the Rationalized Environmental Monitoring Systems (환경영향평가 협의내용의 사후관리 합리화방안 연구)

  • Han, Sang-Wook;Choi, Jae-Yong;Lee, Chun-Won;Kim, Im-Soon;Jeon, Sook-Jin;Han, Jung-Hee
    • Journal of Environmental Impact Assessment
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    • v.9 no.2
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    • pp.119-126
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    • 2000
  • Environmental monitoring system has been adopted and supplemented as inspection measures for the quantitative and qualitative changes of environmental impact assessment (EIA). Meanwhile it has been continuously pointed out that there is insufficient connection between environmental monitoring system and EIA. Often the agreed environmental impact assessment has not been fulfilled due to the argument of the cost, timing and situations of construction sites. Thus the purpose of this study is in search of the rationalized environmental monitoring system in order to harmonize the development and environmental conservation through the improvement of unreasonable aspects of the current EIA execution process. As to comply with the purpose, this research was carried out with three different but complimentary sources: environmental laws and regulations, foreign case studies of Japan, U.S.A. and Canada, and interviews with 73 experts. Finally, improved environmental monitoring system has been introduced reflecting the present process of EIA.

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Construction of In-process Monitoring System using $C^{++}$ and Neural network ($C^{++}$과 신경망을 이용한 In-process 감시 시스템의 구축)

  • 조종래;정윤교
    • Proceedings of the Korean Society of Machine Tool Engineers Conference
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    • pp.95-98
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    • 2002
  • Monitoring of the cutting trouble is necessarily required to do Factory Automation and Intelligent manufacturing system. Therefore, we constructed a monitoring system using neural network in order to monitor of the cutting trouble. From obtained result, it is shown that the cutting trouble can be monitored effectively by neural network

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Monitoring system of laser materials processing using chromatic modulation technique (색변조 기술을 이용한 레이저 가공 공정 모니터링 시스템)

  • 이종명
    • Journal of Korean Society of Laser Processing
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    • v.4 no.2
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    • pp.29-38
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    • 2001
  • A development of in-process and reliable monitoring system in laser materials processing is essential for successful applications toward the real industrial fields. It was known that optical signals induced by laser-matter interactions provide a good indication not only to monitor various defects but also to characterize and identify the process However there are still difficulties to implement the optical monitoring system in real fields since the system is susceptible to the spurious change of the signal affected by the variation of experimental conditions and environmental noises. In this article. a new type of optical monitoring technique named 'chromatic modulation technique' is described as a reliable, robust and sensitive monitor for the applications in laser materials processing in order to tackle the conventional problems in optical system.

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A Monitoring System for Functional Input Data in Multi-phase Semiconductor Manufacturing Process (다단계 반도체 제조공정에서 함수적 입력 데이터를 위한 모니터링 시스템)

  • Jang, Dong-Yoon;Bae, Suk-Joo
    • Journal of Korean Institute of Industrial Engineers
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    • v.36 no.3
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    • pp.154-163
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    • 2010
  • Process monitoring of output variables affecting final performance have been mainly executed in semiconductor manufacturing process. However, even earlier detection of causes of output variation cannot completely prevent yield loss because a number of wafers after detecting them must be re-processed or cast away. Semiconductor manufacturers have put more attention toward monitoring process inputs to prevent yield loss by early detecting change-point of the process. In the paper, we propose the method to efficiently monitor functional input variables in multi-phase semiconductor manufacturing process. Measured input variables in the multi-phase process tend to be of functional structured form. After data pre-processing for these functional input data, change-point analysis is practiced to the pre-processed data set. If process variation occurs, key variables affecting process variation are selected using contribution plot for monitoring efficiency. To evaluate the propriety of proposed monitoring method, we used real data set in semiconductor manufacturing process. The experiment shows that the proposed method has better performance than previous output monitoring method in terms of fault detection and process monitoring.

IEC61850 Process Bus Based Distributed Power Quality Monitoring (IEC61850 프로세서 버스 기반 분산형 전력품질감시)

  • Park, Jong-Chan;Kim, Byung-Jin
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.56 no.1
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    • pp.13-18
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    • 2007
  • In this paper, authors deal with an application of power quality monitoring using the Sampled Value which is described in the IEC61850 International Standard for substation communication. Firstly, while Merging Unit is designed as a process level device transmitting sensor data, the practical problems such as time delay compensation and optical fiber communication are issued. Secondly, the Sampled Value message which is proper to a power quality monitoring system is presented. Because the power quality monitoring system requests non time critical service comparing to protection and control applications, the Sampled Value service message structure is introduced to improve efficiency. At last, the power quality monitoring server having various power quality analysis functions is suggested to verify the performance of Merging Unit. With the diverse experiments, it is proved that the process bus distributed solution is flexible and economic for the power quality monitoring.

Development of Web-based Monitoring System for Monitoring Mold Manufacturing Process (금형 가공 공정 모니터링을 위한 웹 기반 모니터링 시스템 개발)

  • Shin B. C.;Choi J. H.;Shin K. H.;Yoon G. S.;Cho M. W.;Kim G. H.
    • Proceedings of the Korean Society for Technology of Plasticity Conference
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    • pp.121-125
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    • 2005
  • In this paper, the web-based monitoring system is developed for the process monitoring of mold manufacturing. The cutting force is measured by hall-sensors which is low cost and useful to be installed in machine tool indirectly. Specially, the current of main spindle in machine tool is converted into cutting force by various experiments. For effective emote monitoring, the interface that is able to offer the information of current process and cutting signal to client is establish.

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