Tunnel and Underground Space (터널과지하공간)

Korean Society for Rock Mechanics and Rock Engineering (한국암반공학회)
권호 표지
DOI QR코드

DOI QR Code

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

  • Soo-Ho Chang (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Tae-Ho Kang (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Chulho Lee (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology) ;
  • Hoyoung Jeong (Department of Energy Resources Engineering, Pukyong National University) ;
  • Soon-Wook Choi (Department of Geotechnical Engineering Research, Korea Institute of Civil Engineering and Building Technology)
  • 장수호 (한국건설기술연구원 지반연구본부) ;
  • 강태호 (한국건설기술연구원 지반연구본부) ;
  • 이철호 (한국건설기술연구원 지반연구본부) ;
  • 정호영 (부경대학교 에너지자원공학과) ;
  • 최순욱 (한국건설기술연구원 지반연구본부)
  • Received : 2023.11.30
  • Accepted : 2023.12.12
  • Published : 2023.12.31
Download PDF
⟨ Previous Next ⟩

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℃ 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.

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℃ 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.

Keywords

Acknowledgement

본 연구는 한국건설기술연구원의 주요사업인 "최대 압축강도 100 MPa의 암반 굴착이 가능한 로드헤더용 픽커터 국산화 기술개발(과제번호: 20230310-001)"의 일환으로 수행되었습니다.

References

  1. Balci, C., Demircin, M.A., Copur, H., and Tuncdemir, H., 2004, Estimation of optimum specific energy based on rock properties for assessment of roadheader performance, The Journal of The South African Institute of Mining and Metallurgy, 633-642. 
  2. Balci, C. and Bilgin, N., 2007, Correlative study of linear small and full-scale rock cutting tests to select mechanized excavation machines, International Journal of Rock Mechanics & Mining Sciences, 44, 468-476.  https://doi.org/10.1016/j.ijrmms.2006.09.001
  3. Bilgin, N., Demircin, M.A., Copur, H., Balci, C., Tuncdemir, H., and Akcin, N., 2006, Dominant rock properties affecting the performance of conical picks and the comparison of some experimental and theoretical results, International Journal of Rock Mechanics and Mining Sciences, 43(1), 139-156.  https://doi.org/10.1016/j.ijrmms.2005.04.009
  4. Chang, S.H., 2015, A Consideration for Mechanical Rock Excavation Focusing on TBM and Roadheader, Journal of the Korean Society of Mineral and Energy Resources Engineers, 52(5), 531-548.  https://doi.org/10.12972/ksmer.2015.52.5.531
  5. Chang, S.H., Kang, T.H., Lee, C., and Choi, S.W., 2023, Statistical Analysis of Geometric Parameters and Rock Conditions of Pick Cutters for Roadheaders, Tunnels & Underground Space, 33(5), 414-424. 
  6. Cho, M.G., Cho, J.W., Kim, M.G., Jeong, J.H., and Choi, S.H., 2023, Operating Process of Transverse Type Roadheader for Tunnel Excavation in Korea, Tunnel and Underground Space, 33(1), 1-9.  https://doi.org/10.7474/TUS.2023.33.1.001
  7. Choi, S.W., Chang, S.H., Park, Y.T., and Lee, G.P., 2014a, Performance estimation of conical picks with slim design by the linear cutting test (I): depending on attack angle variation, Journal of Korean Tunnelling and Underground Space Association, 16(6), 573-584.  https://doi.org/10.9711/KTAJ.2014.16.6.573
  8. Choi, S.W., Chang, S.H., Lee, G.P., and Park, Y.T., 2014b, Performance estimation of conical picks with slim design by the linear cutting test (II): depending on skew angle variation, Journal of Korean Tunnelling and Underground Space Association, 16(6), 585-597.  https://doi.org/10.9711/KTAJ.2014.16.6.585
  9. Choi, S.W., Chang, S.H., Park, Y.T., Lee, G.P., and Bae, G.J., 2013, A experimental study on the loads and temperature acting on the shaft of a disc cutter during linear rock cutting test, Journal of Korean Tunnelling and Underground Space Association, 15(3), 237-251.  https://doi.org/10.9711/KTAJ.2013.15.3.237
  10. Choi, S.W., Kang, T.H., Chang, S.H., Lee, C., Lee, G.P., and Kim, C.Y., 2016, Performance estimation depending on the insert size of conical picks by linear cutting test, Journal of Korean Tunnelling and Underground Space Association, 18(2), 221-233.  https://doi.org/10.9711/KTAJ.2016.18.2.221
  11. Clark, M.R., McCann, D.M., and Forde, M.C., 2003. Application of infrared thermography to the non-destructive testing of concrete and masonry bridges. NDT International, 36, 265-275.  https://doi.org/10.1016/S0963-8695(02)00060-9
  12. Eyyuboglu, E.M. and Bolukbasi, N., 2005, Effects of circumferential pick spacing on boom type roadheader cutting head performance, Tunnelling and Underground Space Technology, 20(5), 418-425.  https://doi.org/10.1016/j.tust.2005.02.002
  13. Guerin, A., Jaboyedof, M., Collins, B.D., Derron, M.H., Stock, G. M., Matasci, B., Boesiger, M., Lefeuvre, C., and Podladchikov, Y.Y., 2019, Detection of rock bridges by infrared thermal imaging and modeling, Scientific Reports, 13(13138). 
  14. Han, J.S. and Park, J.H., 2008, The Study of Infrared Thermography of a Mild Steel for Nondestructive Evaluation, Journal of Ocean Engineering and Technology, 22(2), 72-77. 
  15. Hekimoglu, O.Z. and Fowell, R.J., 1991, Theoretical and practical aspects of circumferential pick spacing on boom tunnelling machine cutting head, Mining Science and Technology, 13(3), 257-270.  https://doi.org/10.1016/0167-9031(91)90397-U
  16. Hekimoglu, O.Z. and Ozdemir, L., 2004, Effect of angle of wrap on cutting performance of drum shearers and continuous miners, Mining Technology, 113(2), 118-122.  https://doi.org/10.1179/037178404225004977
  17. Jung, J.H., Yim, J.H., Lee, J.W., Kang, H.B., Kim, D.H., and Shin, Y.J., 2023, Development of roadheader performance prediction model and review of machine specification, Journal of Korean Tunnelling and Underground Space Association, 25(3), 221-243.  https://doi.org/10.9711/KTAJ.2023.25.3.221
  18. Kim, M.G., Song, C.H., Oh, J.Y., and Cho, J.W., 2022, Contribution Assessment of Roadheader Performance Indexes by Analysis of Variance, Tunnel and Underground Space, 32(6), 386-396.  https://doi.org/10.7474/TUS.2022.32.6.386
  19. Labus, M. and Labus, K., 2018, Thermal conductivity and diffusivity of fine-grained sedimentary rocks, Journal of Thermal Analysis and Calorimetry, 132, 1669-1676.  https://doi.org/10.1007/s10973-018-7090-5
  20. Min, D.H., Jang, B.S., and Yoon, H.K., 2023, Application of infrared thermography for estimating residual stress in ground anchors for maintenance, Scientific Reports, 13(36).
  21. Rostami, J., 2013, Final Report on Cutterhead Design Procedures and Performance Evaluations for Roadheader, Submitted to KICT, p. 34. 
  22. Shahabedin, H., Jeong, H., and Jeon, S., 2018, Prediction Model for Specific Cutting Energy of Pick Cutters Based on Gene Expression Programming and Particle Swarm Optimization, Tunnel and Underground Space, 28(6), 651-669.  https://doi.org/10.7474/TUS.2018.28.6.651
  23. Su, O. and Akcin, N.A., 2011, Numerical simulation of rock cutting using the discrete element method, International Journal of Rock Mechanics & Mining Sciences, 44, 468-476. 
  24. Wang, H., Webb, T., and Bitler, J.W., 2015, Study of thermal expansion and thermal conductivity of cemented WC-Co composite, Int. Journal of Refractory Metals and Hard Materials, 49, 170-177.  https://doi.org/10.1016/j.ijrmhm.2014.06.009
  25. Wua, J.H., Lin, H.M., Lee, D.H., and Fang, S.C., 2005, Integrity assessment of rock mass behind the shotcreted slope using thermography, Engineering Geology, 80, 164-173.  https://doi.org/10.1016/j.enggeo.2005.04.005