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采用消失模铸造生产了单件质量为20t的汽车模具铸件,其轮廓尺寸为4540mm×2400mm×800mm,材质为HT300;采用密度为17.5kg/m3的EPS模样,模样质量为44.6kg,型砂采用粒度为10/20目的普通石英砂;采用流涂工艺涂刷3遍水基涂料,在烘干室干燥8～9h,涂层厚度控制在1.5～2.0mm;采用雨淋式加砂和人工辅助加砂相结合,负压度平均为0.05MPa,负压作用时间为25min;采用中频无芯感应电炉熔炼,浇注温度为1370～1400℃,浇注系统采用底注加侧注,浇注时间为3min,箱内保温时间约85h。
The production of a single piece with the mass of 20t is made of automotive mold castings with an outline size of 4540mm × 2400mm × 800mm and a material of HT300 by using the lost foam casting. The EPS sample with a density of 17.5kg / m3 is used, the quality of the sample is 44.6kg, For the purpose of 10/20 ordinary quartz sand; flow coating process brushing three times water-based paint, drying in the drying chamber 8 ~ 9h, the coating thickness control in 1.5 ~ 2.0mm; rain with sand and artificial supplemented plus Sand combined, the average negative pressure of 0.05MPa, negative pressure time of 25min; IF coreless induction furnace melting, pouring temperature of 1370 ~ 1400 ℃, pouring system with the end of the note plus side note, pouring time of 3min, box Internal holding time is about 85h.