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多年以来,工业部门一直在探索用硬质合金做工具材料来提高孔加工的效率。但是到目前为止能够采用的只有镶硬质合金不重磨刀片的浅孔钻头。而且,其直径在18.5毫米以上,加工深度只是直径的3倍(图1、2)。这种浅孔钻头有两个或两个以上的切削刃,每个切削刃都对加工部分进行切削。切削刃是这样配置,既让右边的切削刃的切削阻力和左边切削刃的切削阻力大小相等,方向相反。因此,切削加工时,作用在钻头直径方向
For many years, the industrial sector has been exploring the use of cemented carbide as tool material to increase the efficiency of hole machining. However, only shallow hole drills with cemented carbide non-resharpened blades so far are available. Moreover, its diameter is more than 18.5 mm, the processing depth is only 3 times the diameter (Figure 1, 2). This shallow hole drill has two or more cutting edges, each of which cuts the machined portion. The cutting edge is configured such that the cutting resistance of the right cutting edge and the cutting resistance of the left cutting edge are equal in magnitude and opposite in direction. Therefore, the cutting process, the role of drill diameter