公开(公告)号：US5666051A

公开(公告)日：1997-09-09

申请号：US539241

申请日：1995-10-04

申请人： Warren R. Junker ,  Lee W. Burtner ,  Michael G. Peck ,  Richard J. Makar ,  David A. Chizmar

发明人： Warren R. Junker ,  Lee W. Burtner ,  Michael G. Peck ,  Richard J. Makar ,  David A. Chizmar

IPC分类号： G01B7/24 ,  G01N27/72 ,  G01N27/90 ,  G01R33/12

CPC分类号： G01N27/72 ,  G01B7/24 ,  G01N27/9013 ,  B82Y35/00

摘要： Both a system and method are provided for mapping the magnitude of residual compressive stresses over the surface of a ferromagnetic machine component, such as a valve ring of the type used in refrigeration compressors. The system includes an eddy current probe having a detection coil for emanating a fluctuating electromagnetic field that shallowly penetrates the surface of the valve ring or other ferromagnetic component, a probe circuit connected to the coil for both conducting a high frequency alternating electric current through the coil and detecting changes in the impedance in the coil, and a scanning mechanism having a turntable for supporting and rotating the component. A support arm positions the coil of the eddy current over a central portion of the valve ring while the ring is rotated by the turntable and changes in coil impedance are detected by the probe circuit. A microprocessor converts the fluctuations in the impedance detected by the eddy current probe circuit into residual stress values, and correlates these values with regular positions on the valve ring in order to generate a map of the residual surface stresses over the ring.

摘要翻译： 提供了一种系统和方法，用于映射铁磁机器部件（例如在制冷压缩机中使用的类型的阀环）的表面上的残余压缩应力的大小。 该系统包括具有检测线圈的涡流探针，该检测线圈用于发出浅层地穿透阀环或其它铁磁部件的表面的波动电磁场;连接到线圈的探针电路，用于传导通过线圈的高频交流电流 并且检测线圈中的阻抗的变化，以及具有用于支撑和旋转部件的转盘的扫描机构。 支撑臂将涡流的线圈定位在阀环的中心部分上，同时环由转台旋转，线圈阻抗的变化由探针电路检测。 微处理器将由涡流探针电路检测的阻抗的波动转换为残余应力值，并将这些值与阀环上的常规位置相关联，以便产生环上的残余表面应力的映射。