冷轧平整机高强钢表面振痕问题的测试与研究
Measurement and Research on Strip Surface Vibration Mark Problem of High Strength Steel in Skin Pass Rolling

为解决某冷轧连退线平整机在平整汽车板高强钢时常出现的表面振痕问题，对平整机辊系和传动系统进行了多轮次现场振动加速度测试，并进行了时域和频域分析。结合传动系统啮合频率计算，认为传动系统工作不良是引起辊系振动的直接原因。建立六辊平整机机座系统的三维有限元模型，针对其固有特性进行仿真，计算得到平整机易激发振动的主要频率，通过与产生振痕时减速箱齿轮啮合频率对比，可确定减速箱齿轮的啮合冲击造成平整机的强迫振动，并引发带钢振痕。提出了使轧制速度避开系统固有频振区的抑振对策并投入工业生产实践，汽车板高强钢振痕缺陷年改判量降低了近90%。
Strip surface vibration marks often appear on the surface of high strength steel produced by a cold rolling skin pass mill. After several rounds of industrial vibration tests of the roll system and drive system, we conducted time and frequency domain analysis of the vibration signal, calculated the gear-mesh frequency of the drive system, and analyzed the drive system to be the origin of vibration of the rolls system. Then, we set up the three-dimensional finite element model of a six-high skin pass mill and calculated the natural frequency. After comparison with the gear-mesh frequency, we concluded that the meshing impact of the gear box created the forced vibration of the skin pass mill. Finally, we carried out a rolling strategy with rolling speed that avoided the system’s natural frequency vibration zone in industrial production and reduced the strip surface vibration mark of high strength steel by 90%.