一次成形精孔钻,即用钻头一次钻成精孔。尤其在加工非标准孔没有专用饺刀时,能直接钻出合乎精度和光洁度要求的孔。一次成型精孔钻是在标准麻花钻和普通精扩孔钻的基础上,改变切削角度和几何参数,修磨出来的一种钻头。它改变了标准麻花钻的主切削刃太长、排屑难、切削宽度大、切削条件差、散热低、磨损快等缺点;克服了普通精扩孔钻的刃倾角为正值,切屑流向已加工面,对孔壁光洁度不利等弊病。此种精孔钻在 Once forming a precision drill, drill a drill into a fine hole. Especially in the processing of non-standard holes do not have a special dumpling, can directly drill holes meet the requirements of accuracy and finish. A forming precision drill is a standard twist drill and ordinary precision reaming drilling on the basis of changes in cutting angle and geometric parameters, grinding out of a drill. It has changed the standard twist drill main cutting edge is too long, difficult to chip removal, cutting width, cutting conditions, low heat, wear and other shortcomings; overcome the ordinary precision reaming drilling edge angle is positive, the chip flow has been Machining surface, the hole wall finish adverse disadvantages. This hole drilling in