利用气流冲击试验机进行造型工艺试验，使用的型砂为南昌柴油机厂高压造型用砂。
When the moulding technological test is carried out on the air impulse test moulding machine, the moulding sand employed is the sand used by Nanchang Diesel Factory for high-pressure moulding.
通过对型砂各因子和水平的正交试验和方差分析，得出了最佳的配比。
Optimum Ratio is obtained by orthogonal test and variance analysis for different factors and levels.
试验表明，累托石粘土粉不宜直接用于型砂，但它是一种优良的水基涂料的悬浮剂。
Results show that the rectorite cant be used when molding sand, but it is a good suspension agent for mold coating.
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