二代加CPR1000型主泵泵壳铸造工艺及控制

Casting Process and Control of Second-generation Plus CPR1000 Primary Pump Shell

CPR1000型主泵泵壳采用铁素体含量为12%~20%的奥氏体不锈钢铸造。介绍了泵壳铸件制造的关键工艺,采用自硬砂造型,选择底返式快速浇注并用氩气保护的浇注工艺。采用1包浇注,包孔直径为110mm(两个)。横浇道直径为140mm(两个),内浇道直径为100mm(4个),浇注时间为120~150s,金属液面上升速度为12~20mm/s,浇注温度为1 520~1 550℃,成功铸造出了主泵泵壳。

CPR1000 primary pump shell was manufactured with austenite duplex stainless steel contained12%to 20%ferrite by sand casting.The self-hardening sand was adopted to fabricate sand mold,and bottom-back rapidly pouring with Ar protection was designed.Through using one steel ladle pouring with diameter of ladle of 2×φ110 mm and diameter of runner of 2×φ140 mm as well as diameter of ingates of 4×φ100 mm,the CPR1000 primary pump shell was produced successfully with lifting velocity of 12-20 mm/s at 1 520-1 550 ℃for 120-150 s.