车轴钢渗碳层深度弱磁检测技术研究  

Research on Weak Magnetic Inspection of Axle Steel Carburizing Layer Depth

作　　者：邱朋闯 于润桥[1] 桂长城 陈旺 Qiu Pengchuang;Yu Runqiao;Gui Changcheng;Chen Wang(Key Laboratory of Nondestructive Testing Technology,Ministry of Education,Nanchang Hang Kong University,Nanchang 330038)

机构地区：[1]南昌航空大学,无损检测技术教育部重点试验室,南昌330038

出　　处：《汽车工艺与材料》2024年第1期55-60,共6页Automobile Technology & Material

摘　　要：针对现有车轴钢渗碳层深度无损检测技术的工程局限性,提出一种弱磁检测方法,即利用渗碳层与其心部交界处应力集中且无法消除、进而对外表现出特定的磁感应强度的无损检测方法。通过采集不同样本车轴钢及其不同部位的磁场信号,分析磁感应强度幅值与深度的对应关系,构建弱磁检测数学模型。试验结果(标准厚度/检测厚度/绝对误差):花键外圆3.50 mm/3.57 mm/0.07 mm、杆部外圆4.30 mm/4.46 mm/0.16 mm、R角4.00 mm/3.86 mm/-0.14 mm,检测精度整体相对误差小于5%,满足工厂实际检测需求。To deal with the limitation of the existing non-destructive testing technology for the depth of the carburized layer of axle steel,a weak magnetic detection method is proposed.Since the stress concentrates at the junction of the carburized layer and its heart and can't be eliminated,and then externally show a specific magnetic induction intensity for non.By collecting magnetic field signals from different samples of axle steel and different parts of axle steel,we analyzed the corresponding relationship between magnetic induction intensity amplitude and depth,and constructed a mathematical model for weak magnetic detection.The test results show that:spline outer circle(standard thickness/inspection thickness/absolute error):3.50 mm/3.57 mm/0.07 mm;rod outer circle:4.30 mm/4.46 mm/0.16 mm;R-angle:4.00 mm/3.86 mm/-0.14 mm.The overall relative error of the inspection accuracy is less than 5%,which meets the actual needs of the factory inspection.

关 键 词：应力 磁感应强度 弱磁检测 渗碳层深度 

分 类 号：TG157[金属学及工艺—热处理]