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1932—1935年期间，有关钻粒在孔底的作用问题会是广泛研究和探讨的课目，从此便出现了破裂钻粒在破碎岩石上起主要作用的观点；在孔底被钻头研转的同时破裂钻粒便以其锐利的棱角刮磨和削铇岩石。“铁砂极脆井在钻头底唇之下迅速破裂成锐角碎块。碎块在孔底为钻头所研转并以其锐利的棱面尅剥岩石。必须指出，可以使用钢砂和按大小选配过的钢质角粒进行钻进，但是所用之钢料应富有足够的脆性”——B．M．库？明工程师是这样论述钻粒的作
From 1932 to 1935, the question of the role of grain in the bottom of the hole was widely studied and explored. From this point of view, the point at which fractured grains played a major role in crushing rocks was observed. At the same time, Cracked diamonds sharpen and sharpen their rocks with their sharp edges and corners. “The iron crushed crisp well ruptured sharply into sharpened fragments beneath the bottom lip of the drill bit. The fragments were developed at the bottom of the drill bit and stripped of rock with their sharp prism faces. It must be pointed out that grit and size can be used With the steel particles for drilling, but the steel used should be sufficiently brittle ”- B. M. Library? This is how Ming-Ming engineers discussed drilling