我厂生产动力配件,球铁曲轴的型号较多,轴颈由φ50～φ140不等。根据近几年生产情况,皮下气孔、夹渣、冷隔等一般能在冷加工时切削掉,个别不能去掉的,再根据厂定技术条件宏观处理。唯有疏松、缩孔是我厂探伤检查的主要对象,也是我厂目前在铸造方面较难克服的缺陷。现将探伤方法介绍如下.探伤部位的选择为了叙述方便,以东方红-75拖拉机曲轴为例,其外形见图1。浇铸工艺采用平浇平冷。浇冒口摆在 I plant the production of power parts, ductile iron crankshaft models more, journal from φ50 ~ φ140 range. According to the production situation in recent years, subcutaneous stomatal, slag inclusion, cold insulation and other general cutting can be cut in the cold, can not be removed, and then set the macro conditions according to the factory technical conditions. Only loose, shrinkage hole is the main object of our factory inspection, but also my factory is currently casting more difficult to overcome the defect. Flaw detection methods are introduced below. The choice of testing sites For the convenience of description, the East Hong-75 tractor crankshaft, for example, the shape shown in Figure 1. Casting process using flat pouring cold. Risers posing