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在硬岩和特硬岩石中穿凿炮孔所用的牙轮钻头,一般均镶嵌按苏联国家标准880—75规定生产的Γ-26型硬质合金柱(见图a),这种合金柱是由碳化钨加钴烧结而成。硬质合金柱的原材料属于奇缺物资,而合金柱的制造工艺又是费力和困难的。牙轮钻具和硬质合金柱的意义,可用下述经济特性来评价:钻具费用占穿孔成本的30％,而装用合金柱的费用又占钻头成本的30％。柱齿式钻头的合金柱由全苏硬质合金工业联合公司所属工厂生产。尽管牙轮钻头
Tricone bit used to drill holes in hard rock and extra hard rock are generally inlaid with Γ-26 type cemented carbide column (see Figure a) produced according to the Soviet Union’s national standard 880-75, this alloy column is made of Tungsten carbide plus cobalt sintering. The raw material of the cemented carbide column belongs to the scarce material, and the manufacturing process of the alloy column is again laborious and difficult. The significance of roller cone and carbide columns can be assessed with the following economic characteristics: Drilling costs account for 30% of the cost of perforation, while loading of alloy columns accounts for 30% of the cost of drilling. The column of bit alloy drill bit by all the United States cemented carbide industry joint factory production. Despite the roller cone bit