HT300 automobile mould with 20 tons and 4540 mm in length and 2400 mm in width

800 mm in height was produced by full mold casting. EPS pattern with 17.5kg/m3 in density and 44.6 kg in net weight was adopted. Common quartz sand with 10/20 mesh was used. And then

three layers water-based coatings with coating thickness of 1.5

2

mm were sprayed by flow-coating ways

and the pattern was dried at drying chamber for 8

9

hours. Shower sand-adding combining with man sand-adding was used with negative pressure of 0.05 MPa for 25 min. Medium frequency coreless furnace was adopted to melt iron

and it was poured with bottom pouring integrated with side-pouring at 1 370

1

400 ℃ for 3 min. Finally

the dwelling time in the box was approximately 85 hours.