• Title/Summary/Keyword: 성형 모니터링

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Comparative Analysis of Injection Molding Process by On-line Monitoring in Cylinder of Injection Molding Machine and in Cavity of Mold (사출성형기 실린더와 금형 캐비티의 실시간 모니터링을 이용한 사출성형공정 비교 분석)

  • Park, Hyung-Pi;Cha, Baeg-Soon;Tae, Jun-Sung;Choi, Jae-Hyuk;Rhee, Byung-Ohk
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.10
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    • pp.1513-1519
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    • 2010

  • Recently, on-line process monitoring systems using sensors are being extensively used to produce highquality products. However, the difficulty in installing the sensors within the mold in the cases of micro-molds, optical molds, and molds with complex structures is a serious disadvantage of such process monitoring systems. In this study, the quantitative index of a process monitoring system was evaluated with the mold cavity pressure and the nozzle pressure for the injection molding machine. In order to evaluate the effect of the nozzle pressure, we performed correlation analysis for the weight of the molded product. We also examined the control characteristics of the injection molding machine by analyzing the effect of multistage injection speed, holding pressure, and injection pressure limit on the process monitoring data.

  • https://doi.org/10.3795/KSME-A.2010.34.10.1513 인용 PDF KSCI

Cure Monitoring of Composite Laminates Using Fiber Optic Sensors (광섬유 센서를 이용한 복합재료 적층판의 성형 모니터링)

  • Gang, Hyeon-Gyu;Gang, Dong-Hun;Park, Hyeong-Jun;Hong, Chang-Seon;Kim, Cheon-Gon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.2
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    • pp.59-66
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    • 2002

  • In this paper, we present the simulataneous monitoring of the strain and temperature during cures f various composite laminates using fiber Bragg grating/extrinsic Fabry-Perot interferometric (FBG/EFPI) hybrid sensors. Three types of graphite/epoxy composite were used : a undirectional laminate, a symmetric cross-ply laminate, and a fabric laminate. Two FBG/EFPI hybrid sensors were embedded in each laminate at different directions and different locations. We performed the real time monitoring of fabrication strains and temperatures at two points within the composite laminates during cure process in an autoclave. Throuhg these experiments, FBG/EFPI sensors proved to be an efficient choice for smart cure monitoring of composite structures.

  • https://doi.org/10.5139/JKSAS.2002.30.2.059 인용 PDF KSCI

Papers : Simultaneous Monitoring of Strain and Temperature During and After Cure of Unsymmetric Cross - ply Composite Laminate Using Fiber Optic Sensors (논문 : 비대칭 직교적층 복합재료 적층판의 성형시 및 성형후 광섬유 센서를 이용한 변형률 및 온도의 동시 모니터링)

  • Gang,Hyeon-Gyu;Gang,Dong-Hun;Hong,Chang-Seon;Kim,Cheon-Gon
    • Journal of the Korean Society for Aeronautical & Space Sciences
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    • v.30 no.1
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    • pp.49-55
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    • 2002

  • In this paper, we present the simulation monitoring of strain and temperature during and after the cure of unsymmetric composite laminate using fiber optic sensors. Fiber Bragg grating/extrinsic Fabry-Perot interferometric (FBG/EFPI) hybrid sensors are used to measure those measurands. The characteristic matrix of the sensor is analytically derived and measurements can be done without sensor calibration. A wavelength-swept fiber laser is utilised as a lighr source. Two FBG/EFPI sensors are embedded in a graphite/epoxy unsymmetric cross-ply composite laminate in different directions and different locations. We perform a real time monitoring of fabrication strains and temperatures at two points of the composite laminate during cure process in an autoclave. Also, the thermal strains and temperatures of the fabricated laminate are measured in a thermal chamber. Through these experiments, we can provide a basis for the efficient smart processing of composite and know the thermal behavior of unsymmetric cross-ply composite laminate.

  • https://doi.org/10.5139/JKSAS.2002.30.1.049 인용 PDF KSCI

Molding Quality Evaluation on Composite Laminate Panel for Railway Vehicle through Cure Monitoring using FBG Sensors (광섬유 FBG 센서기반 성형 모니터링을 통한 철도 차량용 복합재 내장재 패널의 성형 품질 평가)

  • Juyeop Park;Donghoon Kang
    • Composites Research
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    • v.36 no.3
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    • pp.186-192
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    • 2023

  • Recently, in the field of railway vehicles, interest in the use of composite materials for weight reduction and transportation efficiency is increasing. Accordingly, research and commercialization development to apply composite materials to various vehicle parts are being actively conducted, and evaluation is conducted centering on post-measurement such as mechanical performance evaluation of finished products to verify quality when composite materials are applied. However, the analysis of heat and stress generated during the molding process of composite materials, which are factors that greatly affect manufacturing quality, is insufficient. Therefore, in this study, in order to verify the molding quality of composite parts for railway vehicles, the molding quality analysis was conducted for the two types of composite interior panels (laminate panel and sandwich panel) that are most actively used. To this end, temperature and strain changes were monitored during the molding process by using an FBG fiber optic sensor, which is easy to apply to the inside of the composite, and the residual strain value generated after molding was completed was measured. As a result, it was confirmed that overheating and excessive residual stress did not occur, thereby verifying the excellent molding quality of the composite interior panel for railway vehicles.

  • https://doi.org/10.7234/composres.2023.36.3.186 인용 PDF HTML