摘要
根据北京地区地层中含有大量砂卵石的特点,对盾构机刀具进行了失效分析,发现其失效原因主要是冲击和高应力磨粒磨损。针对盾构机刀具的再制造,开发了一种堆焊药芯焊丝DG7。再制造刀具的刃口堆焊层无裂纹,硬度为50～55HRC,冲击后硬度为55～60HRC。再制造刀具的寿命高于进口刀具。
Constructing subway by shield method is an important way to solve the heavy city＇s traffic at present. This paper analysed the shield machine cutter＇s failure based on the geology in Beijing region,which is full of grit and scree. It was found that the shield machine cutter＇s failure was caused by high stress, impact and grain-abrasion. A hardfacing flux-cored wire named DG7 was developed to repair and reproduce the cutter. There was no crack in the deposited metal on the reproducing cutter＇s cutting edge. The deposited metal＇s hardness was 50-55 HRC and became 55-60 HRC after impact. The reproducing cutter＇s service life was longer than that of the imported cutter.
出处
《中国表面工程》
EI
CAS
CSCD
2006年第3期44-46,共3页
China Surface Engineering
关键词
盾构机刀具
失效分析
药芯焊丝
堆焊
shield machine cutting tool
failure analysis
flux-cored wire
hardfacing
