在生产铝合金壳体类铸件时,大多数工厂(包括我厂在内)一般都采用合脂砂或树脂砂制芯。由于铝合金壳体类铸件壁较薄,且浇注温度较低(650～760℃)。在浇注后,芯砂的溃散性差、残留强度高,清理困难。以我厂批量生产的外混式轴向回流型自吸离心泵的泵壳为例(铸造工艺见图示),材质为ZL104,其中ⅠⅡⅢ号砂芯,原先一直采用合脂砂制作,其配比和性 In the production of aluminum alloy shell castings, the majority of factories (including our factory) are generally used synthetic sand or resin sand core. As the shell of aluminum alloy shell thinner, and the pouring temperature is low (650 ~ 760 ℃). After pouring, the collapse of the core sand poor, high residual strength, cleaning difficulties. Taking the pump shell of external mixing axial return type self-priming centrifugal pump manufactured by our factory as an example (the casting process is shown in the figure), the material is ZL104, among which, the sandstone of No.ⅠⅢⅢ has been made of synthetic sand, Than and sex