铁道货车转8A铸钢侧架B部位裂纹分析  

ANALYSIS OF CASTING CRACK IN B OF Z8A SIDE FRAME FOR RAILWAY FREIGHT CARS

作　　者：程里[1] 余家捷 

机构地区：[1]重庆工学院材料科学与工程学院,重庆400050 [2]铁道部驻重庆重型铸锻厂车辆验收室,重庆400083

出　　处：《理化检验（物理分册）》2008年第5期261-263,266,共4页Physical Testing and Chemical Analysis(Part A:Physical Testing)

摘　　要：在生产铁道货车铸钢转8A侧架时,近30%的侧架B部位产生横向裂纹。采用化学成分分析及裂纹的宏、微观检验等方法对产生横向裂纹的侧架B部位进行了分析,并对其铸造工艺进行了探讨。结果表明侧架B部位产生横向裂纹的主要原因在于防裂拉筋设计不合理,导致铸件凝固时出现热裂纹。并提出了有效的改进措施。The Crossing cracks were found in B position of 30% steel-casting side frame at foundry. Analysis was performed on the crack zone by chemical compositions , macroscopic and microscopic testing. The results showed that gear axle failure resulted from hydrogen brittleness and fatigue fracture. Foundry pouring and moulding procedure were casted back, and technics was improved and supervised. The result showed that crossing crack in B position was caused preventing crack tie bar designing mistakenly. And the improved methods were put forward.

关 键 词：铁路车辆 铸钢侧架 横向裂纹 防裂拉筋 

分 类 号：U260.331.8[机械工程—车辆工程]