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包头市水暖器材厂革命职工在试制汽车发动机缸体零件时,采用QT60- 2球铁无冒口铸造工艺,解决了缩孔、缩松等铸造缺陷,铸件经机械加工后检查,质量良好。无冒口球铁铸造工艺的特点是: 1.对铸铁化学成份的控制 (1)提高含碳量:碳当量提高至4.44％。 (2)增大孕育硅量:试验得知,加入孕育硅0.8％时,缩凹现象即减轻。采用低硅原铁水,加大孕育硅量来消除渗碳体,提高自行补缩能力。 (3)控制硫量降低残余镁量:残余镁量高,基体组织中炭化物多,收缩大,而产
The revolutionary workers of Baotou Plumbing Equipment Factory used QT60 - 2 ductile iron casting process without casting to solve the casting defects such as shrinkage cavity and shrinkage when the trial manufacture of automobile engine block parts. The castings were checked after machining and the quality was good. No riser Ductile iron casting process is characterized by: 1. The chemical composition of cast iron control (1) increase the carbon content: carbon equivalent increased to 4.44%. (2) increase the amount of inoculation silicon: test that, when adding silicon 0.8% pregnant, shrinkage reduction phenomenon. The use of low-silicon original hot metal, increase the amount of inoculation to eliminate cementite cement, improve self-feeding capacity. (3) control of sulfur to reduce the amount of residual magnesium: high residual magnesium, carbon content in the matrix more, shrinkage, and production