变壁厚回转体零件超声检测动态闸门技术研究

Research on ultrasonic dynamic gate technology for inspection of rotational parts with variable thickness

针对回转体自动化超声检测系统难以对变壁厚零件进行全尺寸检测的特点,提出一种基于底波声时预扫查的闸门动态控制技术。首先利用预扫查获取底波声时信息,然后对无底波声时信息的过渡区讨论线性及非线性插值方法,构建出闸门宽度控制数组,最后设计算法实现与验证试验,用该数组实时控制扫查闸门宽度,实现对变壁厚回转体的全尺寸扫查成像检测。实验结果表明:动态闸门技术可以有效检测出变壁厚回转体零件中的缺陷。

Aiming at the problem that the revolving body automatic ultrasonic testing system can hardly detect the full size of parts with variable thickness, a gate dynamic control technology based on the bottom wave prescanning is presented. Firstly, prescanning is used to acquire the bottom wave acoustic time information, and then the linear and nonlinear interpolation methods are discussed for the transition region of the non bottom wave acoustic time information, and the gate width control array is constructed. Finally, the algorithm implementation and verification experiment are carried out, the scanning gate width is controlled by the array in real time, and the full scale scanning imaging detection of the revolving body with variable thickness is realized.The results show that the dynamic gate technology can effectively detect the defects in the parts with variable thickness.