仿生侵蚀介质对滚刀/大理岩滚动摩擦磨损行为的影响  

Effect of Biomimetic Erosive Medium on the Rolling Friction and Wear Behavior of TBM Cutter/Marble

作　　者：杨康辉 吴志鑫 苏叶茂 刘少锐 郑靖 周仲荣[1] YANG Kanghui;WU Zhixin;SU Yemao;LIU Shaorui;ZHENG Jing;ZHOU Zhongrong(School of Mechanical Engineering,Southwest Jiaotong University,Chengdu 610031,China;China Railway Engineering Services Co.,Ltd.,Chengdu 610083,China)

机构地区：[1]西南交通大学机械工程学院,成都610031 [2]中铁工程服务有限公司,成都610083

出　　处：《表面技术》2024年第9期117-126,共10页Surface Technology

基　　金：国家自然科学基金(52075459);四川省国际科技创新合作/港澳台科技创新合作项目(2020YFH0018)。

摘　　要：目的对比去离子水和仿生侵蚀介质2种工况下,滚刀/大理岩摩擦副在不同法向载荷作用下的滚动摩擦磨损行为,阐明仿生侵蚀介质对大理岩破碎去除和滚刀磨损的影响规律和作用机制,为化学手段辅助提升全断面隧道掘进机(TBM)破岩效率提供参考。方法表征自制仿生侵蚀介质对大理岩和H13钢滚刀的腐蚀性,基于自制滚压破岩模拟试验机研究滚刀/大理岩摩擦副的滚动摩擦磨损行为。结果仿生侵蚀介质对滚刀无明显腐蚀性,但会诱导大理岩表面产生次生裂隙和溶蚀孔,弱化岩石表面的力学性能。在法向载荷为45、75、105N时,相较于去离子水工况,在仿生侵蚀介质工况下大理岩的磨损体积分别提高了25.3%、9.3%、17.5%,滚刀破岩比能分别下降了28.3%、11.4%、20.0%。在法向载荷为45 N时,岩石表面的破坏形式主要为矿物颗粒破碎剥落。在法向载荷为75N时,岩石的去除量明显增大,表面形成了密实核。在法向载荷为105N时,岩石表面发生显著开裂和去除现象。结论仿生侵蚀介质能促进大理岩的破碎和去除,降低滚刀磨损和破岩比能。仿生侵蚀介质的作用受到岩石破坏形式的影响,在法向载荷较低时,岩石表面破坏形式以矿物颗粒剥落和密实核形成为主,仿生侵蚀介质仅作用于岩石表层,其效果有限;在法向载荷较高时,岩石表面会产生裂纹和开裂,有利于仿生侵蚀介质向岩石内部的渗透,刀具的破岩效率显著提高。The cutters of tunnel boring machines(TBMs)suffer severe wear and low rock-breaking efficiency when encountering hard rocks including marbles and granites that have high hardness and abrasiveness.Recently,the studies have revealed a few biomimetic erosive media for degrading the mechanical properties of rocks,but little work has been completed on the effect of the media on the rock-breaking performance and wear behavior of TBM cutters.Therefore,the work aims to investigate the rolling friction and wear behavior of TBM cutter/marble under different normal loads in a biomimetic erosive medium,and elucidate the effect of the biomimetic erosive medium on marble surface damage and cutter wear,to provide valuable insights for the chemically assisted improvement of TBM rock-breaking efficiency.In this study,flat samples were natural marbles of 270 mm in diameter and 15 mm in thickness,and ring-shaped counterparts were reduced-scale TBM disc-cutters that were made in H13 steel with an outside diameter of 15 mm and an edge width of 0.8 mm.A mixed solution of EDTA-2Na,phytic acid and KOH developed by the inspiration of bio-erosion in nature was used as biomimetic erosive medium(EP)and deionized water as control medium.The corrosiveness of EP was characterized with marble and cutter samples.A self-made rock-breaking test rig was employed to conduct the rolling friction and wear tests of the cutter/marble pair in the deionized water and EP and three normal loads of 45,75 and 105 N were used.Surface hardness of samples was measured with a micro-hardness tester.The wear morphologies and profiles were characterized by a laser confocal scanning microscope,a scanning electron microscope and a three-dimensional optical microscope.All tests were conducted at 20℃.The bionic erosion medium EP was not obviously corrosive to the cutters but induced secondary cracks and corrosion pores on the surface of marble sample,and the surface hardness of marble was reduced by about 20.6%after 1 min immersion in the EP.Under the given rolling fr

关 键 词：TBM滚刀 大理岩 仿生侵蚀介质 滚动 法向载荷 摩擦磨损 

分 类 号：TH117.1[机械工程—机械设计及理论]