螺旋槽中心钻与直槽中心钻相比,具有切削平稳、容屑槽大、强度好、寿命长、可加大进刀量、加工光洁度好等优点,但是,加工较为困难。我厂接到一批外商订货螺旋槽中心钻的加工任务,其结构如图1所示,右旋、导程S=79,齿数Z=2,K=0.8,看起来比较简单,但加工却很麻烦。由于中心钻是螺旋槽,心壁有13°正锥,在X62W铣床上,用135型分度头可以扳起正锥13°角度,但定心精度达不到要求,铣出的槽一边深一边浅;采用一般工具磨床磨螺旋槽的槽底及前角,较为困难。为此,设计制造了 Compared with the straight groove center drill, the spiral groove center drill has the advantages of stable cutting, large chip flute, good strength, long service life, high feedability and good machining finish. However, the machining is difficult. I plant received a number of foreign orders spiral groove center drilling processing tasks, the structure shown in Figure 1, right-hand, lead S = 79, the number of teeth Z = 2, K = 0.8, looks relatively simple, but processing Very troublesome. As the center of the drill is a spiral groove, the heart wall has a 13 ° positive cone, in the X62W milling machine, the 135 indexing head can be upright cone angle of 13 °, but not meet the requirements of centering accuracy, milling groove deep While shallow; the use of general tool grinding mill groove spiral groove and rake angle, more difficult. To this end, designed and manufactured