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以往翻砂用造型原砂,都是石英砂或石英—长石砂,因它们都能耐高温,在自然界又普遍存在,容易获得。在浇注要求更高的铸件时,一般使用锆英、铬矿、氧化镁、橄榄岩等成分的原砂。这些材料来源不够充沛,价格昂贵,有的从国外进口,不能满足近代工业迅速发展的需要。我厂广大职工,大胆革新,试验用石灰岩经机械破碎,筛选成规定粗细的砂粒,用于铸钢件造型,取得了满意的效果,这种砂子被定名为“七○砂”。
In the past, sand used to shape the original sand, is quartz sand or quartz - feldspar sand, because they are resistant to high temperatures, common in nature and easy to obtain. Casting higher requirements in the casting, the general use of zircon, chrome ore, magnesia, peridotite and other ingredients of the original sand. These materials are not abundant enough, expensive, and some imported from abroad, can not meet the needs of the rapid development of modern industry. I plant a wide range of workers, bold innovation, experimental limestone by mechanical crushing, screening into the provisions of the thickness of the sand for casting steel shape, and achieved satisfactory results, this sand was named “70 sand.”