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논문 기본 정보

자료유형
학술저널
저자정보
Chang, Soo-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) Lee, Chulho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) Kang, Tae-Ho (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology) Ha, Taewook (Department of Mining and Processing Technology, Korea Resources Corporation) Choi, Soon-Wook (Geotechnical Engineering Research Institute, Korea Institute of Civil Engineering and Building Technology)
저널정보
테크노프레스 Geomechanics & engineering Geomechanics & engineering 제13권 제1호
발행연도
2017.1
수록면
141 - 159 (19page)

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A pick cutter is a rock-cutting tool used in partial-face excavation machines such as roadheaders, and its quality is a key element influencing the excavation performance and efficiency of such machines. In this study, pick cutters with hardfacing deposits applied to a tungsten carbide insert were made with aim of increasing their durability and wear resistance. They were field-tested by being installed in a roadheader and compared with conventional pick cutters under the same excavation conditions for 24 hours. The hardfaced pick cutters showed much smaller weight loss after excavation, and therefore better excavation performance, than the conventional pick cutters. In particular, the damage to and detachment (loss) of tungsten carbide inserts was minimal in the hardfaced pick cutters. A detailed inspection using scanning electron microscope-energy dispersive X-ray spectrometry and three-dimensional X-ray computed tomography scanning revealed no macro- or micro-cracks in the pick cutters. The reason for the absence of cracks may be that the heads of pick cutters are mechanically worn after the tungsten carbide inserts have been worn and damaged. However, scanning revealed the presence of voids between tungsten carbide inserts and pick cutter heads. This discovery of voids indicates the need to improve production processes in order to guarantee a higher quality of pick cutters.

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