高光洁度精孔钻,在精加工45#钢孔时,光洁度能达▽8～▽9,比采用铰孔办法和用高速钢钻头精加工孔,光洁度明显提高1～2级。在钻床上如用液压、挤压等专用刀具精加工孔,仅适宜加工铸铁,但加工铸钢则较为困难。所以,如被精加工的钢件孔要求较高时,尤其适合用高光洁度精孔钻加工。实践证明,这是一种效果较好,易于推广的先进钻型。 High precision finish drilling, finishing 45 # steel hole, the finish up to ▽ 8 ~ ▽ 9, than the use of reaming methods and high-speed steel drill bit finishing hole, significantly improved finish 1 to 2. In the drilling machine, such as hydraulic, squeeze and other special tools finishing hole, only suitable for processing cast iron, but the processing of cast steel is more difficult. Therefore, such as the steel hole being machined higher requirements, especially for high-precision fine hole drilling processing. Practice has proved that this is an effective, easy to promote advanced drilling type.