壳型铸造用覆膜砂若干技术问题探讨

根据壳型生产线十几年运行和各类覆膜砂应用的经验,对壳型铸造用覆膜砂的一些技术问题进行探讨。详细介绍适用于吹砂式多工位壳型机的湿态覆膜砂性能;高强度低树脂量覆膜砂的研制;湿态壳型覆膜砂的成形性指数与调湿工艺;翻斗法制壳时的脱壳问题分析和解决办法;覆膜砂脱壳性检测方法;高镍球铁件壳型铸造表面针孔原因分析与抗针孔覆膜砂的应用。

A Discussion on Some Technical Problems of Resin-Coated Sands for Shell Mould Casting

Based on the experience with more than 10 years running shell mould casting line and with the application of various resin coated sands,some technical problems of resin coated sands for shell mould castings were discussed.A detailed introduction was made to the properties of the wet coated sand suitable for multi-station shell mould shooting machine;the development of a sort of high strength coated sand with low resin content;the shaping index and wetness adjusting process;analysis and prevention of peel back defect of shells made with overturning hopper process;test method of peel back resistance of coated sand;pinhole defect analysis of high Ni ductile iron shell mould castings and application of anti-pinhole coated sand.