铸铁件的漏磁检测方法  

Magnetic flux leakage testing methods for cast iron lids

作　　者：李路明[1] 黄松岭[1] 李振星[1] 施克仁[1] 

机构地区：[1]清华大学机械工程系,北京100084

出　　处：《清华大学学报（自然科学版）》2002年第4期474-476,共3页Journal of Tsinghua University(Science and Technology)

基　　金：国家自然科学基金资助项目 ( 5 0 0 0 10 0 6)

摘　　要：为了检测轿车变速箱端盖的表面裂纹缺陷 ,提高轿车使用过程中的安全性 ,讨论了采用漏磁检测方法检测轿车变速箱端盖表面缺陷的基本原则 ,采用有限元计算和磁路理论计算相结合的方法 ,解决了铸铁件检测中较难解决的磁化问题。针对检测过程中存在的噪声和检测信号的处理问题 ,提出了针对轿车变速箱端盖漏磁检测信号特征的程序滤波方法 。The magnetic flux leakage testing method was used to find surface cracks on a gear box lid which can cause catastrophic failures in drive trains. The magnetic flux leakage testing method principle is discussed for surface cracks on gear box lids. The magnetization of the cast iron lid was analyzed using the finite element method combined with magnetic circuit theory. The noise during testing and the signal processing method was also discussed. The filter method was given to increase the signal noise ratio. Practical results show that the method can effectively locate cracks.

关 键 词：铸铁件 漏磁检测 信号处理 

分 类 号：TG143[一般工业技术—材料科学与工程] TG115.284[金属学及工艺—金属材料]