冷轧平整机振纹实测研究

Measurement of chatter marks on the backup roll of a cold temper mill

针对某1700冷轧平整机支持辊表面振纹问题进行了连续跟踪测试.在对平整机固有特性研究的基础上,通过对支持辊各个使用时期内振动信号的分析与比较,得到了平整机的振动特征以及振动与振纹之间的相互影响关系:在支持辊使用初期,平整机系统的振动以自激振动为主,振动频率为150Hz,在稳定轧制阶段工作辊对支持辊的相对运动形成支持辊表面振纹;在支持辊使用中后期,由振纹引起的强迫振动进一步加速了振纹的形成,系统的振动为强迫振动和自激振动共存.在对振纹形成过程认识的基础上提出了振纹抑制措施,即在轧件入口侧增加抑振辊或改变轧制速度.

Continuous tracking measurements were conducted for eliminating the chatter marks of a 1700 temper mill. The character of vibration and the interaction between vibration and chatter marks were found based on the study of inherent characteristics of the temper mill and the analysis of vibration signals in different periods. The primary vibration model was self-sustained vibration and the vibration frequency was 150 Hz in initial stage, but in steady stage the relative movement between the work roll and the backup roll induced chatter marks. In middle and final period the primary vibration model was a coexistence of forced vibration and self-sustained vibration, and the forming process of chatter marks was accelerated by forced vibration resulted from chatter marks. Based on the above studies some countermeasures are derived as follows： adding a roll to control vibration in the inlet side or changing the speed of temper rolling.