Evaluation on cutting performance of novel PDC cutter for pipe jacking machine
作者机构：School of Earth Sciences and EngineeringNanjing UniversityNanjingJiangsu 210023China Shanghai Tunnel Engineering Co.Ltd.Shanghai 200232China State Key Laboratory for Geomechanics and Deep Underground EngineeringChina University of Mining and TechnologyXuzhouJiangsu 221116China School of Mechanics and Engineering ScienceShanghai UniversityShanghai 200444China
出 版 物：《Underground Space》 (地下空间（英文）)
年 卷 期：2024年第14卷第1期
页 面：34-52页
核心收录：
学科分类：08[工学] 0802[工学-机械工程] 080201[工学-机械制造及其自动化]
基 金：supported by the Shanghai Science and Technology Development Funds(Grant No.20QB1401800) Xuzhou Science and Technology Plan Social Development Key Special Project(Grant No.SHFZZDZX20210017) Yunlong Lake Laboratory of Deep Underground Science and Engineering Project(Grant No.104023006)
主 题：PDC cutter RC Pipe jacking machine Linear cutting tests Damage and wear LS-DYNA
摘 要：It is inevitable to cut reinforced concrete(RC)appeared in cross passage of city metro by cutting tools when constructing in densely populated *** previous cutters employed to cut RC are insufficient and easily damaged,so a new polycrystalline diamond compact(PDC)cutter is used to solve this *** on the theoretical analysis of cutting mechanism,both circular and tapered PDC cutters with cutting edge angle of 90and negative front rack angle of 10are used to cut *** peeling and breaking patterns of cutting concrete are proposed,the nodular and grainy chips are the preferred modes in cutting steel *** LS-DYNA is employed to investigate the cutting performance in *** simulation results show that the average and peak cutting forces increase with the growth of penetration depth,cutting speed,and roundness,and subsequently the recommended penetration depth less than 1.2 mm is obtained to cut RC due to the existence of steel ***,the linear cutting platform is adopted to investigate the force ability and damage state of PDC *** is concluded that the cutting force increases abruptly and fluctuates heavily when cutting the coarse *** patterns occurred in both numerical and experimental results are generally ***,the steel bar is pulled out and the PDC cutter is damaged at the penetration depth of 0.8 mm,while a good cut occurs at the penetration depth of 0.3 *** tapered PDC cutter with a relatively low cutting force is prone to be broken compared with circular PDC *** is suggested that the circular PDC cutter at the penetration depth of 0.3 mm should be used to cut RC in practical engineering.
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