Hard-bake hardening gas coupling core sand core making method waterglass

The present invention relates to a "hard CO2 gas - bake" coupled hardened water glass sand core core making method, CO2 gas hard to solve the current method, a thermal hardening method, microwave heating, VHR hardening, ester cured, self-hardening sand method waterglass existing core issues. The present invention without changing the conventional process equipment sand core, sand process, process conditions core CO2 water glass, to achieve water glass sand core core production process steps: weighing of raw materials - Mixer (manufactured by sodium silicate sand) - performance Test sand - a mold (core box) filled with sand compaction - CO2 gas blow molding core preliminary hardening - release - bake hardening completely - finished core. The present invention is shorter than the time blowing CO2 gas method 2/3 hard, blowing efficiency is improved 2 to 3 times than the CO2 gas hard methods; 15% lower than the production cost of CO2 hard methods, 1/3 reduce labor intensity, and improved Productivity.