Rough hole surface
1. Chip sticking: reduce cutting speed; avoid edge chipping; change cutting fluid with high extreme pressure and improve filtration; increase the pressure and flow rate of cutting fluid.
2. Poor coaxiality: adjust the coaxiality between the machine tool spindle and the drill sleeve; use the appropriate drill sleeve diameter.
3. Cutting speed is too low, feed is too large or uneven: use appropriate cutting parameters.
4. Improper tool geometry: change the geometry angle of cutting edge and the shape of guide block
The orifice is trumpet shaped
Poor coaxiality: adjust the coaxiality of machine tool spindle, drill sleeve and support sleeve; use appropriate drill sleeve diameter and timely replace the worn drill sleeve.
Broken drill bit
1. The chip breaking is not good and the chip can not be discharged: change the size of the chip breaking groove to avoid being too long and too shallow; timely find out the situation of chipping edge and replace it; increase the pressure and flow of cutting fluid; adopt the workpiece with uniform material organization.
2. Feed too large, too small or uneven: use appropriate cutting parameters.
3. Excessive wear of drill bit: replace the drill bit regularly to avoid excessive wear.
4. Unsuitable cutting fluid: select appropriate cutting fluid and improve filtration.
Low bit life
1. The cutting speed is too high or too low, and the feed rate is too large: use appropriate cutting parameters.
2. Unsuitable drill bit: change tool material; change the position and shape of guide block.
3. Unsuitable cutting fluid: use cutting fluid with high extreme pressure; increase the pressure and flow of cutting fluid; improve the filtration of cutting fluid.
other
Chip banding: the geometry of chip breaking groove is not suitable; the geometry of cutting edge is not suitable; the feed rate is too small; the material organization of workpiece is uneven: change the geometry of chip breaking groove and cutting edge; increase the feed rate; adopt the workpiece with uniform material organization.
The chip is too small: the chip breaking groove is too short or too deep; the radius of the chip breaking groove is too small: change the geometry of the chip breaking groove.
Too large chip: too long or too shallow chip breaking groove; too large chip breaking groove radius: changing the geometry of chip breaking groove
