用加长普通麻花钻的工作刃部来加工深孔,其钻孔效率和钻头寿命都受到较大的限制。近些年来,国内外对它的结构作了重大改进,研制成了各种新型的长刃钻头。它较大地改变了麻花钻原来的模式,大幅度地提高了钻深孔的切削性能。一、结构特性综合起来、新型长刃麻花钻具有下列四方面的特性。 With the extension of ordinary work-edge twist drill to process deep holes, the drilling efficiency and bit life are subject to greater restrictions. In recent years, the structure of its home and abroad has made significant improvements, developed a variety of new long-edge bit. It greatly changed the original twist drill mode, greatly improving the drilling performance of the deep hole. First, the structural characteristics Taken together, the new long edge twist drill has the following four characteristics.