针对大型锥筒形锻件手工检测时存在的问题, 在研究距离-幅值曲线拟合方法和伪彩色成像原理的基础上, 设计了一套五自由度超声C扫描成像自动检测系统。检测结果以伪彩色图像的形式表示,再对含有缺陷的锥筒形锻件进行了检测试验。结果表明: 系统可替代手工完成该类锻件的自动检测, 结果直观可靠, 缺陷定量定位简便准确, 提高了检测效率, 降低了劳动强度。

For solving the problems faced by manual testing of large tapered-cylinder forgings, the automatic ultrasonic C scan imaging detection system with 5 degrees of freedom was designed by studying DAC fitting method and pseudo color imaging principle. Test data are represented by pseudo color image. One large tapered-cylinder forgings containing defects was tested. Result showed that the system could replace manual testing to achieve automatic detection of large tapered-cylindrical forgings and the detection result was more intuitive and reliable, thus making the quantization and location of defects become more simple and fast. Therefore the detection efficiency was improved and labor intensity was reduced.