从全苏工具科学研究所进行的研究资料看出:正确选择小规格钻头(直径到1毫米)的伸出长度,可显著提高它的寿命和生产能力。可是现在加工时,不论伸出长度大的和伸出长度小的钻头都选用同样的切削规范。这样伸出长度大的钻头,由于它的动态刚性减弱,结果磨损显著增加,从而过早报废(图1和表1)。 According to the research data from All-China Tool Science Research Institute, the correct selection of the extension length of a small-sized drill bit (1 mm in diameter) significantly improves its life span and productivity. But now the processing, regardless of the length of the stick and stick out the length of the small selection of the same cutting specifications. This extended length drill bit, due to its weaker dynamic stiffness, resulted in a significant increase in wear resulting in premature scrap (Figure 1 and Table 1).