我厂使用水玻璃自硬型砂已基本成功,但在起模、翻型、吊芯等操作过程中,铸型或型芯不可避免的会发生损坏和破裂。自硬砂铸型的修补,一般比较困难。过去采用水玻璃或粘土作粘结剂的型砂修补,往往由于硬化慢、强度差而产生一些铸造缺陷,而且工效低。 Our factory uses water glass self-hardening sand has been basically successful, but in the mold, turning, hanging core and other operations, the mold or core will inevitably occur damage and rupture. Self-hardening sand mold repair, generally more difficult. In the past the use of water glass or clay binder for sand repair, often due to slow hardening, poor strength and have some casting defects, and low efficiency.