Views:609 Author:Site Editor Publish Time: 2021-01-25 Origin:Site Inquire
1.Typical problems in percussive drilling
1.1 Percussion
Too high:
- Button breakages
- Drill steel / Shank breakages
Too low:
- Low penetration rate
- Excessive button wear (due to rotation breaking the rock)
-> percussion measure settings are always compromise between penetration rate and drill steel economy
1.2 Feed
Too high:
- Problems in flushing
- Rapid button / body wear
- Increased hole deviation
- Problems in uncoupling
- Bending of drill steel and shank -> breakages
Too low:
- Button pop-outs
- Poor penetration rate
- Loose couplings and excessive thread wear
- Poor energy transmission
1.3 Rotation
Too high:
- Recutting and low penetration rate
- Excessive bit wear (since the rock is forced to break by rotation instead of percussion)
- Uncoupling is difficult
Too low:
- Low penetration rate
- Energy is lost for recutting
1.4 Flushing
Too high:
- Unnecessary energy loss at the compressor
- In waterflushing water enters into the drifter if sealing is broken
Too low:
- Low penetration rate (increased recutting)
- Excessive bit wear
- Bit jamming