北京地区盾构机刀具失效分析及再制造研究 - 中国表面工程.PDFVIP

19 3 Vol.19 No.3 2006 6 CHINA SURFACE ENGINEERING June. 2006 44 2006 1 1 1 2 3 1. , 100022 2. , 100072 3. , 100029 DG7 5055 HRC 5560 HRC TG47 TG71 A 1007−9289(2006)03−0044−03 Failure Analysis and Reproducing of Shield Machine’s Cutter in Beijing Region 1 1 1 2 3 JIANG Jian-min , ZHAO Xue-bin , HE Ding-yong , HAN Wen-zheng , ZOU Ji-bo 1. Beijing University of Technology, Beijing 1000222 The Institute of Armoured Force Engineering, Beijin g 100072; 3 Beijing City Construction Shield Basic Engineering Corporation, Beijing 100029 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 reg ion,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 0 2St52– 3 [2] Q235