论文部分内容阅读
我厂生产的纺织机械及其配件都是中小型铸铁件,原材料低劣。配料时土铁(废铁、回炉铁和废钢)占80~9O%,有时全部土铁,所用焦炭,全年有十个月使用本县土焦,常无硅铁配料,原材料大部分自筹,供应来源很难固定,成份波动大,白口倾向大,收缩大,浇注温度常在1260℃~1320℃。由于几种铸件缩孔缩松严重,而使铸件废品率高,为提高铸件质量,必须相应地采取多种措施。
I plant production of textile machinery and accessories are small and medium-sized cast iron pieces, poor raw materials. Ingredients iron soil (scrap iron, iron and scrap) accounted for 80 ~ 9O%, and sometimes all the soil iron, coke, the use of the county ten months of the year coke, often without ferrosilicon ingredients, most of the self-raised raw materials , The source of supply is difficult to fixed, volatile components, white tend to large, shrinkage, pouring temperature is often 1260 ℃ ~ 1320 ℃. Due to the serious shrinkage of several castings shrinkage, leaving a high rate of casting scrap, in order to improve the quality of castings, must take a variety of measures accordingly.