某公司铸造分厂在铁型覆砂线上生产高强度珠光体球墨铸铁曲轴,经多次试生产,曲轴配重块顶部气孔缩孔缺陷、拐径与配重块接触处热节部位缩松缺陷和砂眼缺陷比较严重,仅气孔缩孔废品就占50％左右,综合废品率高达60％以上,迟迟不能投产。笔者针对缺陷改进了工艺,废品率大幅度下降到15％左右。 A company foundry branch in the iron-coated sand production line of high-strength pearlite ductile iron crankshaft, after several trial production, the crankshaft with the weight of the top of the hole shrinkage defects, the diameter of the contact with the weight section of hot section condensation Defects and trachoma defects more serious, only stomatal shrinkage waste accounted for about 50%, the comprehensive rejection rate as high as 60%, delayed production. The author improved the process for the defect, the rejection rate dropped significantly to 15%.