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当前，金刚石钻探成本在河南若干矿区高于大口径钻探。这有多方面的因素（包括成本摊销、核算等），但在金刚石钻探中组成成本费用的主要部分还是金刚石钻头和扩孔器。因此，除了提高钻头（扩孔器）加工质量，增加品种和正确使用外，如何按不同岩层合理选用不同磨料的钻头和扩孔器，则具有十分重要的意义。我局地质九队原来都是使用的天然表镶和孕镶扩孔器，平均单位成本一直较高。他们根据铸造碳化钨（莱利特）用于钻头和针状合金胎块补强的效能，曾试制了两个铸造碳化钨孕镶扩孔器，经生产试验取得
At present, the cost of diamond drilling is higher than that of large-diameter drilling in several mining areas in Henan. There are many factors (including cost amortization, accounting, etc.), but the main part of the cost of diamond drilling or diamond bits and reamers. Therefore, in addition to improving the drill bit (reamer) processing quality, increase the variety and the correct use, how to use different types of rock drill reasonable rational choice of different bits and reamers, it is of great significance. Nine Bureau of the original geology team are using the natural table set and pregnancy inlay reamers, the average unit cost has been higher. Based on the effectiveness of the cast tungsten carbide (LLE) for the reinforcement of drill bits and needle-shaped alloy blocks, they have tried two cast tungsten carbide inlay reamers, which have been obtained from production tests