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我厂所铸的各种厚大铸钢件,单件重量最重达30吨以上,厚度最大至800公厘以上;这些厚大铸件的芯子在高温作用下,必须具有高度的耐热性,以达到容易清砂得到光洁铸件的目的。我厂除一些大型铸件用镁砂作面砂外,大部分用大罕砂造型,因此在一开始时,这些厚大铸件的铸孔,总是不易铸好,粘砂、渗铁较甚,给清理工作带来了很大困难,有的甚至因此而报废。为此,我们采取了以下的改进措施,并收到了效果。
I cast a variety of large castings of steel, the weight of a single up to 30 tons or more, the maximum thickness of 800 mm or more; the core of these thick castings at high temperatures, it must have a high degree of heat resistance , In order to achieve the purpose of easy clear sand get glossy castings. I plant in addition to some large castings with magnesia for the surface sand, most of the large sand shape, so in the beginning, these thick castings are always difficult to cast holes, sticky sand, iron infiltration more, The cleaning up brought great difficulty, and some even scrapped. To this end, we have taken the following improvement measures and have received results.