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这篇报告是从型砂粒度的观点来研究大连机床厂中铸件产生包砂缺陷的问题，并提出解 决的方向。同时对该工厂的铸工车间中，在现在所具各的生产条件下，使用综合砂或天然砂 的条件提出了意见。
This report examines the problem of sand-bearing defects in castings at the Dalian Machine Tool Plant from the viewpoint of grit size and proposes the direction of solution. At the same time, in the foundry of the factory, opinions were given on the condition of using synthetic sand or natural sand under the present production conditions.