采煤机齿轮开裂的失效分析  

Analysis on Cracking Failure of Shearer Gear

作　　者：李香燕[1] 卢松涛[1] LI Xiang-yan;LU Song-tao(College of Mechanical Engineering,Shangqiu Insititute of Technology,Shangqiu 476000,China)

机构地区：[1]商丘工学院机械工程学院,河南商丘476000

出　　处：《材料保护》2020年第7期182-185,共4页Materials Protection

摘　　要：利用磁粉探伤机、直读光谱仪、维氏硬度计和金相显微镜研究了采煤机齿轮的裂纹形貌、化学成分、硬度梯度和微观组织。结果表明:齿轮的化学成分、显微组织、齿部硬度符合技术要求。齿轮裂纹的位置有黑色的氧化痕迹,且裂纹之间彼此平行且垂直于磨削方向,裂纹位置的显微组织有明显的回火痕迹,且硬度出现了明显下降。产生裂纹的主要原因是齿轮磨削时温度过高造成的,经过采取更换磨削砂轮、减少磨削深度、降低内应力等措施,彻底了解决了齿轮的磨削开裂问题。The crack morphology,chemical composition,hardness gradient and microstructure of shearer gears were studied by magnetic particle testing machine,direct reading spectrometer,Vickers hardness tester and metallographic microscope. Results showed that the chemical composition,microstructure and gear tooth hardness met the technical requirements. The crack location of gears had black oxidation marks,and the cracks were parallel to each other and perpendicular to the grinding direction. The microstructure of the cracks had obvious tempering marks,and the hardness decreased significantly. Cracks were mainly caused by excessive temperature during grinding. By replacing grinding wheel,reducing grinding depth and reducing internal stress,the problem of grinding cracks of gears was thoroughly solved.

关 键 词：采煤机 齿轮 高温 硬度梯度 磨削裂纹 

分 类 号：TG115[金属学及工艺—物理冶金]