【摘要】 在对变厚度航空锻件用反射法进行超声波C扫描过程中,介于界面波和底波之间的缺陷识别区间随工件在各扫描点的厚度变化而变化,使得在厚度未知的情况下难以确定缺陷识别区间的范围,这给缺陷自动识别造成困难。针对此问题,通过获取工件厚度值的方法来引导检测程序确定缺陷识别区间。首先对工件表面进行超声波非接触测量,然后基于测量数据用Z-map方法计算工件在各扫描点的粗略厚度值,最后借助工件的厚度信息引导检测程序自动进行底波跟踪和确定缺陷识别区间。应用表明,该方法能较好地满足变厚度航空锻件超声C扫描的要求。更多还原

【Abstract】 In the ultrasonic C-scan of variation thickness aviation forged piece using pulse echo method, the flaw recognition region between interface echo and bottom echo changes along with the part’s thickness at different scan point, this leads to the range of the flaw recognition region hard to determine without knowing the part’s thickness, and makes difficulties to automatic recognise the flaw. Aiming at this problem, uses the method of obtaining the part’ thickness to help the inspection software determine the flaw recognition region. First, measures the part’s surface using ultrasonic non-contact measurement method; then, with the measurement data of the surfaces, calculates the part’s coarse thickness at each scan point using Z-map method; finally, with the help of the part’s thickness, the inspection software automatic tracks the bottom echo and determine the range of flaw recognition region. It is shown that this method can nicely meet the demand of ultrasonic C-scan for variation thickness aviation forged piece.更多还原