盾构机刀具制造用耐磨耐冲击堆焊药芯焊丝的研究  

Wear resistant impact hardfacing flux-cored wire used in tool manufacture of shield machine

作　　者：蒋建敏[1] 贺定勇[1] 赵学彬[1] 龙世桢 韩文政[3] 

机构地区：[1]北京工业大学材料科学与工程学院,100022 [2]贵州省黔东南州水利水电勘察设计院,556000 [3]装甲兵工程学院,北京市100072

出　　处：《焊接》2008年第3期13-16,共4页Welding & Joining

基　　金：北京市科委科技计划项目(Y0404007040111)

摘　　要：北京地区地层中含有大量的砂砾和卵石,地铁盾构施工时盾构机刀具受到高应力下的磨粒磨损和冲击作用,损耗严重。进口刀具仅能掘进250m左右,这不仅增加了地铁施工成本,影响了施工进程,还增加了因刀具更换次数过多而带来的塌方隐患。文中从刀具的堆焊修复着手开展了盾构机刀具国产化研究,开发了DG7堆焊药芯焊丝。DG7所制堆焊层硬度在51HRC以上,堆焊时无需对刀体进行预热和焊后热处理,堆焊层无裂纹。通过冲击试验和磨粒磨损试验,考察了堆焊层的硬度、组织及其磨粒磨损性能。试验结果表明,堆焊层具有优异的耐磨耐冲击性能。通过合理的堆焊层设计,研制的盾构机刀具达到掘进780余米的使用寿命。In Beijing area,there are plenty of grit and scree in soil.When shield machine works,its cutting tools suffer from strong impact and high stress grinding abrasion.And the service life of imported cutting tools is just about 250 m.It increases the cost and delays the schedule of subway construction,and also takes more dangers for more times of replacing cutting tools.In order to repair the damaged cutting tools,hardfacing flux-cored wire named DG7 was developed.The hardness of deposited metal is above to HRC51.It do not needs preheating and after-heating and there are no cracks in the deposited metal.The hardness,microstructure and performance of deposited metal were researched with impact test and grinding abrasion test.The results show that the deposited metal is good at hard-working and bearing of wear abrasion.The service distance of developed cutting tools is more than 780 m through appropriate designment of hardfaced layer with DG7.

关 键 词：盾构机刀具 堆焊 药芯焊丝 冲击 磨粒磨损 

分 类 号：TG71[金属学及工艺—刀具与模具] TQ633.2[化学工程—精细化工]