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针对热连轧机发生的强烈水平振动现象,结合现场实际情况、轧机实际结构尺寸及工艺技术参数,提出在辊系轴承座水平方向加侧向液压缸来抑制轧机水平振动的方法。以振动最强烈的F3轧机为例,根据轧机辊系的结构特点,建立轧机上工作辊分段非线性水平振动微分方程。经数值仿真,得出在不同油液压力作用下系统的振动加速度有效值,找到了振动加速度最小情况下的油液压力值。为避免系统再次发生主共振、超谐波共振、亚谐波共振和组合共振等现象,通过增大侧向液压缸油液压力来提高水平方向的刚度和阻尼,抑制轧机水平方向振动。最后将该措施应用于工业现场热连轧机,液压缸油液压力调节到8.1 MPa时,水平振动加速度有效值降低75%。仿真和实践结果均表明,该方法可有效抑制热连轧机工作辊水平振动,为研究和抑制轧机振动提供了合理的解决途径。
In view of the strong horizontal vibration occurred in the hot strip mill, a method of suppressing the horizontal vibration of the rolling mill by adding a horizontal hydraulic cylinder in the horizontal direction of the roller bearing was proposed according to the actual situation of the site, the actual structure size of mill and technical parameters. Take the F3 vibration mill with the strongest vibration as an example, according to the structural characteristics of roller mill, the nonlinear horizontal differential equation of the work roll on the rolling mill is established. After numerical simulation, the effective vibration acceleration of the system under different oil pressures is obtained, and the oil pressure under the minimum vibration acceleration is found. In order to avoid the occurrence of primary resonance, superharmonic resonance, subharmonic resonance and combined resonance, the lateral hydraulic cylinder hydraulic pressure is increased to increase the stiffness and damping in the horizontal direction and suppress the horizontal vibration of the rolling mill. Finally, this measure is applied to the industrial hot strip mill. When the hydraulic pressure of hydraulic cylinder is adjusted to 8.1 MPa, the effective value of horizontal vibration acceleration is reduced by 75%. The results of simulation and practice show that this method can effectively suppress the horizontal vibration of work rolls of hot strip mill and provide a reasonable solution to the research and suppression of rolling mill vibration.