Maintenance and maintenance of impact drill bits
Maintenance staff often encounter impact electric drill bit slip, break, squeak and so on when using impact impact drill. I have summarized the following precautions for use:
1. After the drill bit is used, it should be checked immediately for damage, and if the bad shape such as passivation should be ground and trimmed immediately;
2. When the drill bit is placed in the seat during storage, it is convenient to save time and save time to find the bit time.
3. When drilling the through hole, when the drill bit is about to drill through for a moment, the torque is the largest, so it is necessary to feed the knife slowly with lighter pressure, so as to avoid the bit being twisted due to excessive force;
4. The center point must be hit before drilling. The purpose is to avoid the drill bit slipping off the center and guide the drill bit in the correct position;
5. When drilling, fully use the cutting and pay attention to chip removal;
6. When drilling the cross hole, drill the large diameter hole and drill the small diameter hole first;
7. When the drill bit is drilled, the phenomenon of broken or sudden stop may be that the feed is too fast or quenching and hot;
8. Drilling breaks the center of the drill bit. It may be that the lip gap angle is too small, the feed is too fast, the drill bit is passivated, the pressure is too high, there is no cooling, and the drill bit or the workpiece is poorly clamped;
9. When the drill bit is broken during drilling, it may be that the lip gap angle is too small or the drilling speed is too high, the feed is large or the drill bit is passivated and the pressure cutting continues;
10. When the cutting edge is broken during drilling, there may be hard spots in the workpiece material or the feed is too fast, the drilling speed is not properly selected, and there is no simultaneous cutting during drilling;
11. The drilling hole diameter is too large, which may be due to the unequal half angle of the drill bit or the deviation of the static point, the deviation of the spindle, etc.;
12. Only one chip is discharged during drilling, which may be due to the fact that the two cutting edges are not equal in length or the top half angle of the drilling is not equal;
13. A squeaking sound is produced during drilling, which may be due to improper drilling or passivation of the drill bit;
14. Abnormal changes in the properties of the chip during drilling may be caused by passivation or crushing of the trimming edge. 
Editor in charge: Wang Zhen
