低压铸造中对石膏型表面质量及性能有非常高的要求，根据多年低压铸造铝合金花纹块的经验及建立缩 松数据库，分析石膏型表面喷涂强冷涂料对花纹块缩松的影响，主要包括强冷涂料性能研究、喷涂手法、涂层厚 度、喷涂时机、烘干时间等，并应用于实际生产中，极大地降低了花纹块的缩松率，改善了铸铝花纹块缩松缺陷，降低了 生产成本。

The surface quality and properties of gypsum mold were very high in low pressure casting. Based on years of experience in low-pressure casting aluminum alloy pattern blocks and the establishment of shrinkage database, the influence of gypsum surface coating on shrinkage of pattern blocks was analyzed. It mainly includes performance research of strong cold coating, spraying technique, coating thickness, spraying time, drying time, etc. When applied to practical production, the shrinkage porosity rate of the pattern block is greatly reduced, the shrinkage porosity defects of the cast aluminum pattern block is improved, and the production cost is reduced.