• Title/Summary/Keyword: 보링

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Quality Check Monitoring System for Advancing the Yield Rate based on Sensor (베어링 생산수율 향상을 위한 센서기반 품질 체크 모니터링 장치)

  • Xiang, Zhao;Yoon, Dal-Hwan
    • Journal of IKEEE
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    • v.23 no.1
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    • pp.22-28
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    • 2019

  • This paper presents the monitoring method of machining error and quality check to improve the productivity of boring manufacturing process. Machining error usually appears as the offset of spatial location of actual cutting path compared to ideal cutting path. In order to monitor an error of workpiece, multiple factors affecting quality of boring, such as distortion of workpiece, clamping error, radial rotation error of the spindle and motion error of machine tools, were took into account. To verify the productive quality, we propose the quality check system. The system based on IT convergence analyzes the process error rate and saves the analyzed data in memory. Also, these play important roles in detecting an inferior production goods and can decrease the production cost and loss of bearing.

  • https://doi.org/10.7471/ikeee.2019.23.1.22 인용 PDF KSCI HTML

Structural-Health Evaluation for Core Zones of Fill Dams in Korea using Electrical Resistivity Survey and No Water Boring Method (전기비저항 탐사와 무수보링을 이용한 국내 필 댐 코어존의 건전성 평가)

  • Lee, Sangjong;Lim, Heuidae;Park, Dongsoon
    • Journal of the Korean GEO-environmental Society
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    • v.16 no.8
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    • pp.21-35
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    • 2015

  • Electrical resistivity survey (2D and 3D) were employed for detection of possible weak zone of core zones of three central core earth-rockfill dams in Korea. In the 2D results, the core zones is lower resistivity zone with less than $50{\sim}400ohm{\cdot}m$, and the basement is relatively higher resistivity zone with over $1,000ohm{\cdot}m$. In the 3D results, especially, the weak zone with under $100ohm{\cdot}m$ was detected spatial distribution area in the dam. We also drilled boreholes to collect soil samples of core zones of each dam. Water was not used during boring, because water for rotary wash boring could cause structural damages in earth dams. We found that the soil samples of core zones from all of the boreholes correspond to CL (USCS), but we also found that the fluidized or water-saturated soil samples were found in lower resistivity zones. Therefore, the electrical resistivity survey and drilling method without water are a quick and efficient method for structural-health evaluation which is detection of possible weak zones in earth core rockfill dams.

  • https://doi.org/10.14481/jkges.2015.16.8.21 인용 PDF KSCI