在刃磨钻头时,常常发现钻头的磨损都是在外缘转角处和钻尖上,磨损后的轮廓形状基本上呈圆弧形。这表明在钻头上的受力很不均匀,应力集中在外缘转角处和钻尖上。根据这一现象,将钻头的转角和钻尖磨掉,使主切削形成圆弧状。并进行试验,结果得到了令人鼓舞的效果。 In sharpening a bit, it is often found that the wear of the bit is at the corner of the outer edge and at the point of the bit, and the shape of the worn profile is substantially arcuate. This indicates that the forces on the drill bit are very uneven and the stress is concentrated on the corner of the rim and on the drill tip. According to this phenomenon, the drill bit angle and drill worn away, so that the main cutting into a circular arc. And conducted tests, the results have been encouraging results.