1. 钻头意外磨损  - 

2. 钻头磨损  - 

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

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

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

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

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

8. 热龟裂，热裂纹  - 

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

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