摘要
介绍了大高径比钢锭模的铸件结构及技术要求,详细阐述了生产该铸件的铸造工艺：采用横做横浇工艺,封闭式浇注系统,浇口比为∑F直：∑F横：∑F内=1.4：1.2：（11～1.0）,选用尺寸为φ50 mm的出气冒口;呋喃树脂砂造型,将球铁芯骨固定在芯盒内,砂层厚度为40～50 mm;大高径比钢锭模采用高炉铁液浇注,出铁温度控制在1 400＋20℃,在出铁过程中,向流铁槽内加入粒度为3～6 mm的75SiFe及65MnFe,加入量分别为0.3％～0.5％、0.5％～ 1.0％,铁液最终成分为w（C） 4.1％～4.6％、w（Si） 0.6％～1.0％、w（Mn）0.7％～1.0％、w（P）≤0.10％、w（S）≤0.03％;浇注前扒渣3～5次,浇注温度控制在1 260～1 300℃,浇注速度2～3 t/min.最终生产的铸件内壁平直度公差为3～5 mm,内壁光滑,抗拉强度也符合技术要求.
The configuration and technical requirements of a ingot mold casting with big height/diameter ratio was introduced.Casting method of the ingot was described in detail：adopting horizontal molding method and horizontal pouring process;using pressured gating system with section ratio as ∑Fsprue：∑Fruner：∑Fingates=1.4：1.2：（1.1 ～1.0）;using venting riser with diameter of 50 mm;using furan resin sand for molding;the core iron made of nodular iron was fixed in the core box,the thickness of core sand lyer was of 40～50 mm;the ingot mold was poured by using iron melt from a blast furnace;the tapping temperature was controlled in the range of 1 420＋20 ℃ ;0.3%～0.5% 75SiFe with grain size of 3～6 mm and 0.5%～1.0% 65MnFe with size of 3～6 mm was added into the tapping lauder during the tapping process; the final composition was as follows：w （C） 4.1%～4.6%,w （Si） 0.6% ～1.0%,w（Mn） 0.7%～1.0%,w（P）≤0.10%,w（S） ≤0.03%;slag skimming was conducted 3～5 time;pouring temperature was controlled in the range of 1 260～1 300 ℃ ;pouring rate was controlled in the range of 2～3 t/min;the inner wall planeness and straightness tolerance of the finally produced castings was of 3～5 mm,the inner wall was smooth and the tensile strength also met the technical requirement.
出处
《现代铸铁》
CAS
2014年第1期54-56,共3页
Modern Cast Iron
关键词
灰铸铁
大高径比钢锭模
铸造工艺
球铁芯骨
gray iron
ingot mold with big height/diameter ratio
casting method
nodular iron-made core iron
