二十辊轧机轧辊磨床砂轮动不平衡对磨削颤振的影响

Chatter analysis about roll grinder of twenty-high rolling mill in grinding process with grinding wheel dynamic imbalance fault

轧辊磨床磨削过程中轧辊表面经常产生振痕等表面质量缺陷,严重制约生产效率和磨削质量.本文基于磨床双时延动力学模型,以砂轮动不平衡为输入激励,建立了轧辊磨床砂轮动不平衡模型,运用龙格-库塔法进行求解,获得了砂轮动不平衡时磨削系统的动力学特性.通过对正常工况与不同砂轮动不平衡量工况的仿真,获得了其振动响应,并与试验数据进行对比,验证了轧辊磨床砂轮动不平衡模型的正确性和有效性.

In the grinding process of roll grinder,chatter marks are easily to be found on the surface of the roller,which is harmful to the production efficiency and quality. There may be lots of reasons to chatter marks,among which grinding wheel dynamic imbalance was chosen to structure the roll grinder dynamic model based on doubly regenerative time delay grinding model. Runge-kutta algorithm was used to solve the model and the dynamic characteristics of grinding wheel dynamic system were derived. Various simulation results of different degrees of grinding wheel dynamic imbalance are calculated,which coincides with the experimental data,and then the roll grinder dynamic model was demonstrated to be proper and valid.