在车削加工中,经常会遇到φ0.6～φ5mm的小孔钻削。普遍采用在尾座上装夹钻头,或先打中心孔再钻孔,劳动强度大。我们革新了中心可调组合工具,利用方刀架夹紧小钻头,操作方便。可把中心钻和小钻头同时组合后装在钻夹工具上。利用中心钻座1(附图)上的偏心量来调整好中心高,用螺钉2、5锁紧中心钻,再把横向进给向前移动一个距离。利用小钻头卡座4不同孔径的定位 In turning, often encounter φ0.6 ~ φ5mm hole drilling. Generally used in the tailstock mounted bit, or first hit the center hole and then drilling, labor-intensive. We have revolutionized the center of adjustable portfolio tools, the use of square knife holder small bits, easy to operate. Center drill and small drill can be combined at the same time on the drill chuck tool. Center height adjustment using Center Offset on Drill Block 1 (attached), centering drill with screws 2,5, and then traversing the infeed forward a distance. The use of small drill chuck 4 different aperture positioning