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Research and Application of New Spherical Tungsten Carbide Cutting Tools in Guiyang Metro Shield Tunnelling in Karst Strata
(1. School of Mechanical Engineering, Southwest Jiaotong University, Chengdu 610031; 2. China Railway Engineering Services Co.,Ltd., Chengdu 610083; 3. State Key Laboratory of Resource and Environmental Information Systems, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101)
Abstract In the shield tunnelling of Guiyang Rail Transit Line 3, the used ordinary cutting tools were prone to ab? normal wear of cutting tools and falling-off of cutter rings, such as polygonal wear, eccentric wear, and cutting-edge chipping . To improve the capacity of anti-abrasion and impact resistance of disc cutter rings, and increase the overall life of the cutting tools, this paper proposes to use spherical tungsten carbide cutting tools to replace ordinary tools, and introduces the laser cladding welding process and macroscopic wear inspection process. By application of new spherical tungsten carbide cutting tools in actual construction, it is found that the spherical tungsten carbide cutting tool is of better wear resistance with the average wear of 0.002 55 mm/linear meter, while the average wear of the ordinary cutting tool is 0.016 55 mm/linear meter. In the tunnelling of Ring 338-736, the maximum wear of the new spherical tungsten carbide cutting tools is 0.015 mm/linear meter, without cutting-edge chipping or abnormalities in the disc cutter bearings and seals. It has effectively resolved the problems of ordinary cutting tools such as easy and uneven wear and provides reference for the selection of shield cutting tools in the geological conditions of karst strata.
Abstract：
In the shield tunnelling of Guiyang Rail Transit Line 3, the used ordinary cutting tools were prone to ab? normal wear of cutting tools and falling-off of cutter rings, such as polygonal wear, eccentric wear, and cutting-edge chipping . To improve the capacity of anti-abrasion and impact resistance of disc cutter rings, and increase the overall life of the cutting tools, this paper proposes to use spherical tungsten carbide cutting tools to replace ordinary tools, and introduces the laser cladding welding process and macroscopic wear inspection process. By application of new spherical tungsten carbide cutting tools in actual construction, it is found that the spherical tungsten carbide cutting tool is of better wear resistance with the average wear of 0.002 55 mm/linear meter, while the average wear of the ordinary cutting tool is 0.016 55 mm/linear meter. In the tunnelling of Ring 338-736, the maximum wear of the new spherical tungsten carbide cutting tools is 0.015 mm/linear meter, without cutting-edge chipping or abnormalities in the disc cutter bearings and seals. It has effectively resolved the problems of ordinary cutting tools such as easy and uneven wear and provides reference for the selection of shield cutting tools in the geological conditions of karst strata.
ZHANG Longguan1,
2 ZHU Xiaohai2 TUO Hongtao2 WANG Liangdong2 TAN Jiang2 WANG Wei3
.Research and Application of New Spherical Tungsten Carbide Cutting Tools in Guiyang Metro Shield Tunnelling in Karst Strata[J] MODERN TUNNELLING TECHNOLOGY, 2022,V59(2): 251-257
2022, Vol. 59 