1. 钻头磨损  - 

2. 钻头磨损分级  -  https://www.docin.com/p-107116068.html

3. 牙轮钻头磨损分级  -  https://www.docin.com/p-111908487.html

4. 牙轮裂纹  -  https://www.docin.com/p-111908487.html

5. 牙轮相碰  -  https://www.docin.com/p-111908487.html

6. 磨心  -  https://www.docin.com/p-111908487.html

7. 热龟裂，热裂纹  - 

8. 落物损坏  -  https://www.docin.com/p-111908487.html

9. 偏心磨损  -  https://www.docin.com/p-111908487.html

10. 钻头缩径  -  https://www.docin.com/p-111908487.html