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以珍珠岩取代稻草灰作铁水的覆盖剂,克服了原来使用稻草灰时的各种弊端,提高了铸件质量,大大改善了劳动条件。但是,在应用中,珍珠岩覆盖剂经常会发生严重的粘包现象,清理困难。为此,有关单位研制成功了一种珍珠岩新品种——改性珍珠岩覆盖剂。经我厂三个铸工车间的使用表明,这种改性珍珠岩覆盖剂除了能消除粘包现象以外,与普通珍珠岩覆盖剂相比,还具有以下优点:1.使用前不需预热。2.在铁水表面能很快形成整体,不易随铁水浇入铸型;在铁水表面形成的膨化层厚度大,覆盖性好,保
Perlite instead of straw ash as a hot metal covering agent to overcome the original drawbacks when using straw ash to improve the quality of castings, greatly improving the working conditions. However, in applications, perlite coverings often experience severe sticking and cleaning problems. To this end, the relevant units successfully developed a new breed of perlite - modified perlite cover agent. The use of the three foundry workshops in our factory shows that this modified perlite covering agent has the following advantages compared with ordinary perlite covering agent in addition to eliminating sticking phenomenon: 1. No preheating before use. 2 in the hot metal surface can quickly form a whole, not easy with the molten iron poured into the mold; formed in the hot metal surface puffed layer thickness, good coverage, Paul