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我厂采用高铝粉(砂)、水玻璃为制壳材料,并运用正交试验法,进行二十余次试验,基本确定面层,过渡层的最佳工艺参数。现不锈钢铸件表面光洁度已达5～6。 一、制壳工艺参数 影响铸件表面光洁度和质量的因素有:面层涂料粘度、水玻璃比重、NH_4Cl浓度、硬化时间等。 面层及过渡层涂料用水玻璃模数为3.0～3.2,比重1.26～1.34;面层涂料粘度26″～52″;NH_4Cl浓度18～22％;硬化时间,手工为20′,自动线为8′。
I plant the use of high-aluminum powder (sand), water glass shell system materials, and the use of orthogonal test method for more than 20 tests, the basic surface and transition layer of the best process parameters. Stainless steel casting surface finish has reached 5 to 6. First, the shell process parameters affect the casting surface finish and quality factors are: surface coating viscosity, water glass proportion, NH_4Cl concentration, hardening time. Surface and transition layer coating water glass modulus 3.0 to 3.2, the proportion of 1.26 to 1.34; surface coating viscosity 26 “~ 52”; NH_4Cl concentration of 18-22%; hardening time, manual for 20 ’, automatic line 8’.