我厂主要生产小型电动机,其下属的两个铸造分厂生产电动机的铸件。在生产中存在着气孔夹渣等缺陷。废品率较高。通过观察夹渣气孔大多发生在端盖轴承宝内螺丝盘部位。孔径一般为5～8mm;个别甚至在10mm左右。经调查及对原料铁、回炉铁化验分析, I plant mainly produces small motors, its subordinate two casting factory production of motor castings. In production, there are defects such as slag inclusions. The rejection rate is higher. Most of the stomatal holes are observed in the bearing cap screws inside the Bao screw terminal. Aperture is generally 5 ~ 8mm; some even about 10mm. After investigation and analysis of raw iron, iron back analysis,