Abstract
Vibration issues of a five-stand tandem cold rolling mill were found in the steel production practice, and the experimental observation and numerical analysis indicated that the vibrations were related to the back-up roll bearing. The results were validated by replacing the back-up roll bearing with the new bearing resulting in 30% decline in vibration amplitude. Models describing the four-row cylindrical roller bearing and the vertical system of the cold rolling mill including the bearing were established. Moreover, the mechanisms of periodic excitation and amplified vibrations of fault-free bearing were explained theoretically, along with the analysis of bifurcation behaviors of the motion states of the roller bearing and rolling mill system. It is found that the energy transmitted between vibrations with different frequencies if multiple excitation frequencies in the rolling mill system were close.
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Abbreviations
- c :
-
Structural clearance between inner and outer rings
- c 5 :
-
Equivalent damping in rolling process
- c in :
-
Equivalent damping of bearing inner ring
- c out :
-
Equivalent damping of bearing outer ring
- c p :
-
Equivalent damping of bearing in rolling process
- d b :
-
Rolling element diameter
- D b :
-
Nominal diameter of bearing
- f :
-
Inner ring rotational frequency
- F :
-
Bearing preload
- ΔF :
-
Dynamic rolling force
- f cage :
-
Cage rotational frequency
- f jk :
-
Variable stiffness excitation frequency of bearing
- f o :
-
Outer ring fault frequency
- F R :
-
Steady rolling force
- k g :
-
Equivalent stiffness of rolling element
- k in :
-
Equivalent stiffness of bearing inner ring
- k out :
-
Equivalent stiffness of bearing outer ring
- m 1 :
-
Equivalent mass of upper part of rolling mill
- m 2 :
-
Equivalent mass of upper back-up roll
- m 3 :
-
Equivalent mass of upper intermediate roll
- m 4 :
-
Equivalent mass of upper work roll
- m 5 :
-
Equivalent mass of lower work roll
- m 6 :
-
Equivalent mass of lower intermediate roll
- m 7 :
-
Equivalent mass of lower back-up roll and cylinder piston
- m 8 :
-
Equivalent mass of lower part of rolling mill and cylinder block
- m in :
-
Equivalent mass of bearing inner ring
- m out :
-
Equivalent mass of bearing outer ring
- n g :
-
Total number of rolling element
- t :
-
Time
- t en :
-
Entry thickness
- T en :
-
Entry tension
- t ex :
-
Exit thickness
- T ex :
-
Exit tension
- v R :
-
Rolling speed
- α :
-
Bearing contact angle
- ω c age :
-
Angular speed of cage rotation
- ω in :
-
Angular speed of inner ring
- ϕ i :
-
Angle of rolling element i
- ϕ o :
-
Initial angle of rolling element
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Liu, Yj., Wang, S., Qi, Jb. et al. Vibrations of tandem cold rolling mill: coupled excitation of rolling force and variable stiffness of fault-free back-up roll bearing. J. Iron Steel Res. Int. 30, 1792–1802 (2023). https://doi.org/10.1007/s42243-022-00886-1
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DOI: https://doi.org/10.1007/s42243-022-00886-1