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国内外铸钢生产大多采用水玻璃、二氧化碳自硬型砂,也有在铸钢型砂中加入有机或无机自硬剂的。如,日本采用水玻璃硅酸二钙造型法;美国则采用有机自硬剂等。国内有些工厂在型砂中采用加入平炉炉渣,电炉炉渣或赤泥(炼铝付产物)等。我厂机修车间从七四年开始,参考上海造纸机械厂的经验,使用我厂的精炼铬渣(包括中低碳铬铁、微碳铬铁渣)作型砂自硬剂,用于铸钢件的生产进行了一些试验,取得了一些效果。目前,已在大铸钢件中(铁水包4.5吨,大渣罐4吨)应用,完全取代了二氧化碳。一、铁合金炉渣自硬砂原料的选择(一)硬化剂——铁合金炉渣
Cast steel production at home and abroad most of the use of water glass, carbon dioxide from the hard sand, but also in the cast steel sand by adding organic or inorganic self-hardening agent. For example, Japan uses water glass dicalcium silicate method; the United States uses organic self-hardening agent. Some domestic factories in the sand by adding open hearth slag, electric furnace slag or red mud (aluminum to pay products) and so on. Starting from 1974, our factory machine repair shop refers to the experience of Shanghai Papermaking Machinery Factory and uses the refined chromium slag (including medium and low carbon ferrochromium and micro-carbon ferrochrome slag) as the self-hardening agent of our factory for steel casting The production of a number of tests, and achieved some results. At present, it has been completely replaced by carbon dioxide in large steel castings (4.5 tons of ladle and 4 tons of large slag tank). First, ferroalloy slag raw materials selection of hard sand (a) hardener - ferroalloy slag