聊城运输机械厂在力车铸件生产中,轮毂是黑心可锻铸件材料的,铸件经过石墨化退火后,总残存一些带白口的给机加工工序带来麻烦。所以,过去在机加工之前,工人都要先用锤子敲敲,靠听声音、看茬口的方法,把带白口的挑出来。这种方法费时、费力、又不准确。1976年我们共同试制了一台电子检查装置 Liaocheng Transport Machinery Factory in the production of the wheel car castings, wheels are black malleable castings, castings after graphitization annealing, the total remnants of some with white mouth to the machining process to bring trouble. Therefore, in the past before the machining, workers must first knock with a hammer, by listening to the sound, look at the way of stubble, pick out with a white mouth. This method is time-consuming, laborious and inaccurate. In 1976 we piloted a joint electronic inspection device