Correlation Analysis of Cutter Acting Force and Temperature During the Linear Cutting Test Accompanied by Infrared Thermography

Soo-Ho Chang; Tae-Ho Kang; Chulho Lee; Hoyoung Jeong; Soon-Wook Choi

doi:10.7474/TUS.2023.33.6.519

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2023 Vol.33, Issue 6 Preview Page Next Page

Research Article

Correlation Analysis of Cutter Acting Force and Temperature During the Linear Cutting Test Accompanied by Infrared Thermography 선형절삭시험과 적외선 열화상 측정을 통한 픽커터 작용력과 발생 온도의 상관관계 분석

31 December 2023. pp. 519-533

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Abstract

In this study, the linear cutting tests of pick cutters were carried out on a granitic rock with the average compressive strength over 100 MPa. From the tests, the correlation between the cutter acting force and the temperature measured by infrared thermal imaging camera during rock cutting was analyzed. In every experimental condition, the maximum temperature was measured at the rock surface where the chipping occurred, and the temperature generated in the rock was closely correlated with the cutter acting force. On the other hand, the temperature of a pick cutter increased up to only 36°C above the ambient temperature, and the correlation with the cutter force was not obvious. This can be attributed to the short cutting distance under laboratory conditions and the high thermal conductivity of the tungsten carbide inserts. However, the relatively high temperature of the tungsten carbide inserts was found to be maintained. Therefore, it is recommended that a reinforcement between the insert and the head of a pick cutter or the quality improvement of silvering brazing in the production of a cutter is necessary to maintain the high cutting performance of a pick cutter.

Keywords

Pick cutter

Rock

Infrared thermography

Cutter force

Tungsten carbide insert

본 연구에서는 평균 압축강도가 100 MPa 이상인 암석에 대해 픽커터의 선형절삭시험을 실시하였고, 적외선 열화상 카메라를 통해 측정된 픽커터 절삭 시의 발생 온도와 커터 작용력과의 상관관계를 분석하였다. 모든 시험조건에서 최대 온도는 치핑이 발생하는 암석면에서 측정되었고, 암석에 발생한 온도는 픽커터의 작용력과 밀접한 상관관계를 나타내었다. 반면, 픽커터에 발생하는 온도는 대기 온도 대비 최대 36°C 이내로 상승하였고 커터 작용력과의 상관관계도 뚜렷하지 않았다. 이는 실험실 조건의 짧은 절삭거리와 텅스텐 카바이드 삽입재의 높은 열전도 특성이 원인인 것으로 사료된다. 단, 픽커터의 주요 부위 중에 텅스텐 카바이드 삽입재에 상대적으로 높은 온도가 유지되는 것으로 나타나, 픽커터 절삭 성능의 유지를 위해서는 삽입재와 헤드부 사이에 보강을 실시하거나 픽커터 제작 시에 은납 공정의 품질을 향상시키는 것이 필요할 것으로 판단된다.

키워드

픽커터

암석

적외선 열화상

커터 작용력

텅스텐 카바이드 삽입재

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Information

Publisher :Korean Society for Rock Mechanics and Rock Engineering
Publisher(Ko) :한국암반공학회
Journal Title :Tunnel and Underground Space
Journal Title(Ko) :터널과 지하공간
Volume : 33
No :6
Pages :519-533
Received Date : 2023-11-30
Revised Date : 2023-12-12
Accepted Date : 2023-12-12
DOI :https://doi.org/10.7474/TUS.2023.33.6.519

Tunnel and Underground SpaceISSN:1225-1275(Print) 2287-1748(Online)한국암반공학회

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