加工直径为19毫米,长1200亳米凸轮轴的深孔时,原来采用枪管钻头。因为没有专用的深孔钻床,就用车床代替,再加上制造深孔钻头时,不能达到图纸上的技术要求,因而使用中经常发生问题。钻一个零件需要几根钻头。最主要的是钻头折断在凸轮轴内,无法取出,使凸轮轴报废,或使钻杆扭断,发生事故。 When machining a deep hole with a diameter of 19 mm and a length of 1,200 mm camshafts, the original barrel was used. Because there is no dedicated deep hole drilling machine, the use of lathe instead, coupled with the manufacture of deep-hole drill, the drawings can not meet the technical requirements, which often occur in use. A few bits are needed to drill a part. The most important thing is that the bit break in the camshaft, can not be removed, so that the camshaft scrapped, or twist drill pipe, an accident.