| 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50～55 HRC，冲击后硬度为55～60 HRC。再制造刀具的寿命高于进口刀具。 |
| 关键词: 盾构机刀具 失效分析 药芯焊丝 堆焊 |
| DOI： |
| 分类号: |
| 基金项目: |
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| Failure Analysis and Reproducing of Shield Machine’s Cutter in Beijing Region |
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JIANG Jian-min, ZHAO Xue-bin, HE Ding-yong, HAN Wen-zheng , ZOU Ji-bo1,2,3
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1. Beijing University of Technology, Beijing 100022;2 The Institute of Armoured Force Engineering, Beijing 100072;3 Beijing City Construction Shield Basic Engineering Corporation, Beijing 100029
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| Abstract: |
| 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. |
| Key words: shield machine cutting tool failure analysis flux-cored wire hardfacing |
