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一、钻削刀具材料的发展带有可换硬质合金刀片的内冷式麻花钻更有利于切削加工,它比传统钻头节省三分之一的钻削时间。所用的硬质合金刀片牌号是x22和x44,是专为钻削加工而设计的最佳合金刀具材料。由于采用了较细的晶粒结构(晶粒尺
First, the development of drilling tool material With replaceable carbide inserts within the cold-type twist drill is more conducive to cutting, it saves one-third of the drilling time than the traditional bit. The cemented carbide inserts used are the x22 and x44 grades and are the best alloy tool materials designed for drilling. Due to the use of the fine grain structure (grain size