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1.引言自19世纪中叶以来,单刃钻由于其刚性好和不易把孔钻偏而显出优越性。“硬质合金”刀具材料卓有成效的发展,以及机床强度和刚性不断提高,使工具厂有可能制造出
1. INTRODUCTION Since the mid-19th century, single-edged diamonds have shown their superiority due to their high rigidity and their uneven drilling. The effective development of “cemented carbide” tool materials and the ever-increasing machine tool strength and rigidity have made it possible for the tool shop to produce