提出了极坚韧岩石条件下中小钎头硬质合金片(齿)设计的单片(齿)承载效应原理,据此设计的专用小钎头在泸沽铁矿极坚韧富铁矿石的攻关试验中取得了好成绩。 The single-chip (tooth) bearing effect principle of small and medium-sized bit cemented carbide piece (tooth) under very tough rock conditions was put forward. Based on the principle of special small bit head designed in tackling the extremely tough and rich iron ore in Lugu iron mine Achieved good results.