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由中国地质大学、中南工业大学等单位研制的极坚韧岩石用中小直径钎头(φ40毫米马蹄一字形、φ40毫米三刃形、φ60毫米马蹄一字形、φ60毫米十字(Ⅱ)形)于1987年6月24日在武汉通过技术鉴定。以硬脆岩石花岗岩为工作对象的中小直径钎头,在国内外都已获得较好的技术经济效果。但在极坚韧岩石,例如单轴抗压强度达460MPa的矿石中,中小钎头的寿命仅为1m左右。因此,多年来,极坚韧岩石的凿岩问题,一直是采掘工业中的一个“老大难”
The extremely tough rock, developed by China University of Geosciences and Central South University of Technology, was made of medium and small diameter drill bits (φ40 mm horseshoe zigzag, φ40 mm three-edged, φ60 mm horseshoe zigzag, φ60 mm cross) in 1987 June 24 in Wuhan passed the technical appraisal. Small and medium diameter drill bits made of hard and brittle rock granite have gained good technical and economic results at home and abroad. However, in very tough rocks, such as uniaxial compressive strength of ore 460MPa, medium and small bit life of only about 1m. Therefore, for many years, the rock drilling problem of extremely tough rock has always been a “hard-core” in the mining industry