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考虑到制取球墨铸铁小件(回转式压缩机凸轮轴)的一些特殊条件,研究了在球化处理时深采用同型的中间合金以及它们的加入量和加入方法,结果查明,使用ЖКМК-5(Ca约20%,Mg7%)复合球化剂处理铁水,未获得好的效果,石墨主要呈蠕虫状,在铸件表面存在不度达4～5mm的许多气孔,在铸件的中心出现轴向缩松,同时形成许多渣子。上述缺陷的成因是:ЖКМК-5球化剂有成渣倾向,故难于熔入铁水,需要仔细搅拌;处理铁水量少,球化剂的回收率就下降,而球化剂加入量多(约4%)时,则显著降低铁水温度;由于球化剂
Taking into account the special conditions for preparing ductile iron small parts (rotary compressor camshafts), the same type of master alloy and their adding amount and adding method were studied during the spheroidizing treatment. As a result, it was found that the use of ЖКМК- 5 (Ca about 20%, Mg7%) composite nodulizer treatment of hot metal, did not get good results, the graphite was mainly worm-like, the surface of the casting does not reach many pores 4 ~ 5mm, axial center in the casting appear Shrink, while forming a lot of slag. The causes of the above defects are: ЖКМК-5 nodulizer tends to slag, it is difficult to melt into the molten iron, stirring carefully; less iron treatment, nodularization recovery rate decreased, and nodulizer added 4%), the hot metal temperature is significantly reduced; due to nodulizer