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用离心铸造方法制造汽车、拖拉机发动机气缸套毛坯浇注时,必须预先用合成助熔剂直接注入回转的模型里,把铁水中非金属夹杂物和有害的杂质精炼出去。在研究气缸套铸造缺陷时已得知,在离心力作用下,铸件自由表面一侧,熔析出厚为0.6～5毫米的硫化物、矿渣等非金属夹杂物,是铸件废品的主要原因。这些非金属夹杂物的成分是:MnS40～46％、FeS18～22％、Cao11～13％、SiO_29～12％、Al_2O_3 2～5％、MnO1～3％。由于缸套毛坯非金属夹杂物含有很高的硫化物,于是就提出从铁水中能有效地精炼这些化合物的任务,即制定助熔剂的成分。碱金属的盐基或盐、硅酸钠、氟化物和氯化钙,能使铁水里的硫化物,激烈地过渡到助熔剂里。研究得知,Na_2O、CaO、CaF_2 对硫从铁水里过渡到助熔剂里有着良好的作用。
Centrifugal casting method used to manufacture cars, tractors, engine cylinder liner blank casting, synthetic flux must be injected directly into the rotary model, the non-metallic inclusions in the molten iron and harmful impurities refining out. In the study of cylinder liner casting defects have been found, in the centrifugal force, the free surface of the casting, the melting of 0.6 to 5 mm thick sulfide, slag and other non-metallic inclusions, casting the main reason for the scrap. The composition of these non-metallic inclusions is: MnS 40-46%, FeS 18-22%, Cao 11-13%, SiO 29- 12%, Al 2 O 3 32-5% and MnO 1-3%. Since the non-metallic inclusions in the liner blank contain a high amount of sulfides, the task of efficiently refining these compounds from molten iron has been proposed, namely, to make flux compositions. Alkali metal salt or salt, sodium silicate, fluoride and calcium chloride, the molten iron in the sulfide, fierce transition to flux. Studies have shown that Na 2 O, CaO, CaF 2 has a good effect on the transition of sulfur from the molten iron to the flux.