1.钻平底盲孔将钻刃在砂轮上修磨成近似薄板群钻形状,但主切削刃外侧两端与刃带相交的部位不要过尖,用此钻头钻孔的深度接近图纸要求的深度尺寸后(图1虚线位置)。按图2所示方法,将此钻刃在砂轮上修磨成平刃,再用120～150号油石修磨,提高刃部的锋利度。刀具的前角为-10°,后角为2°,用直角尺检验刀具合格 1. Drill flat-bottomed blind holes Drill the edge of the grinding wheel on the grinding wheel to approximate the shape of the group of thin diamonds, but the outer edge of the main cutting edge intersects the land not to tip too sharply. Use this drill to drill the depth close to the depth of the drawing After the size (Figure 1 dotted line position). According to the method shown in Fig. 2, this drilling blade is grinded to a flat blade on the grinding wheel, and then ground with a whetstone of 120 to 150 to improve the sharpness of the blade. The rake angle of the tool is -10 ° and the clearance angle is 2 °. The tool is tested with a square ruler