According to the result of experiments, the author point out that the high strength and high collapsibility resin coated sands used in producing the aluminum alloy castings should be: ① using rounded or near rounded sand; 作者通过大量的试验研究得出以下结论:用于生产铝合金铸件的高强度、易溃散覆膜砂应:①选择粒形圆整的原砂;