高效、低耗凿岩，是全世界采掘工程科技界和产业界共同追求的目标。１９３８年德国人发明了刃片状系列硬质合金钎头，用以取代传统的钢钎凿岩，使岩矿石凿孔效率成百倍提高。经过几十年的凿岩实践，逐渐暴露出刃片状系列钎头需要频繁更换和修磨钎头，而且不能钻凿８９ｍ... Efficient, low-cost rock drilling, mining engineering and technology industries around the world common pursuit of the goal. In 1938 the German invented a blade-like series of carbide drill bit, to replace the traditional drill bit rock drill, rock ore drilling efficiency increased by 100 times. After decades of drilling practice, gradual exposure of blade-type drill bits need frequent replacement and grinding of drill bits, and can not drill  89m ...