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在推广使用潜孔钻机中,遇到的最突出、最普遍的问题,是钻头硬质合金脱片、碎片、断裂和崩角,致使钻头不能达到正常磨损而报废。在f为12～14的矿岩中,钻头的平均寿命(指合金片寿命)不到50米,既影响穿孔效率的提高和成本的降低,又浪费了大量的宝贵稀有金属。近年来,除了寻求合理的钻头体结机、材质和提高硬质合金的强度、韧性外,对钎焊方法与工艺进行了研究探讨。经过几年来的试验和生产实践表明,硬质合金过早损坏的原因,除了其本身的质量问题以外,主要是由于钎焊技术不过关。因此,对钎焊工艺、焊料及熔剂等都值得特别注意。现将有关情况加以概略介绍。
In the promotion of the use of DTH drilling rig, the most prominent and the most common problems encountered are bit carbide cease, chip, fracture and chipping, resulting in the drill can not reach the normal wear and scrap. In ore rock with f12 ~ 14, the average life of the drill bit (the life of alloy flake) is less than 50 meters, which not only affects the improvement of perforation efficiency and the reduction of cost but also wastes a lot of precious rare metals. In recent years, in addition to seeking a reasonable bit body knot machine, material and improve the strength of the cemented carbide, toughness, the brazing methods and processes were discussed. After several years of testing and production practice shows that the cause of premature carbide damage, in addition to its own quality problems, mainly due to brazing technology but off. Therefore, the brazing process, solder and flux are worth special attention. The situation is now briefly described.