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油缸和主轴类等零件的深孔(径长比>25)钻削精度及其轴线相对于基准面的偏移量在很大程度上取决于钻头本身的制造精度和制造质量。采用图示的内排屑单面切削钻头加工这类深孔,由于在切削部分上具有两个以上的分屑台,所以改善了加工质量,并能保证顺利排屑,分屑台的数量取决于直径的大小。钻尖相对于轴线的偏移量k不小于0.1d;而前面相对于轴线的偏移量不大于0.3～0.5毫米。前面上的分屑台与切削刃成2°—3°,此角度的大小取决于走刀量。
Deep holes (radius-length ratio> 25) for parts such as cylinders and spindles The accuracy of drilling and the offset of its axis relative to the datum are largely dependent on the manufacturing precision and manufacturing quality of the drill itself. The use of the chip shown in the chip removal of such deep hole processing, due to the cutting part has more than two chip sets, so as to improve the processing quality, and to ensure the smooth chip, the number of chip sets depends on The diameter of the size. The offset k of the drill tip with respect to the axis is not less than 0.1d; and the offset of the front relative to the axis is not more than 0.3~0.5 mm. The chipper on the front is at 2 ° -3 ° to the cutting edge. The size of this angle depends on the amount of cutting.