带钢冷轧机工作辊表面粗糙峰轧制磨损过程离散元法研究

Simulation of the Rolling Wear of Work Roll Surface Asperities during Strip Cold Rolling by Discrete Element Method

将带钢冷轧过程中磨损量仅有微米或亚微米数量级的工作辊表面粗糙峰的轧制磨损,视作一种由更小尺度的微细颗粒质量脱落引起的不连续细观磨损行为,建立工作辊表面局部区域内粗糙峰轧制磨损的离散元仿真模型,模拟研究工作辊表面粗糙峰上质量脱落的变化过程和磨损规律。针对工业生产中使用电火花毛化机床加工制备的实际工作辊表面微观形貌,抽象建立若干种主要工作辊表面粗糙峰几何形状,研究不同几何形态粗糙峰的表面在相同的轧制工况条件下的不同磨损行为和抗磨损性能,仿真结果与工业生产中实测取得的工作表面粗糙峰磨损规律定性一致。研究也表明,模拟工作辊表面粗糙峰的复杂细观磨损问题,离散元方法可能是一种值得关注的方法。

Based on the fact that the wear volume of rolls in cold rolling is caused only by the wear of the asperities in a micron or submicron magnitude, a discontinued mechanism is presented, in which wear is caused by the shedding mass of particles in a smaller scale. A model based on discrete element method（EDM） is established within a localized area of work roll surface, to simulate the mass shedding process of asperities and the laws of wear of work rolls. Aiming at the real surface topography of work rolls, which is created by electrical discharge texturing machines to control the microscopic surface quality of strip, several major shapes of asperities are abstracted used in the model, to study the different wear behavior and wear resistance of different work roll surfaces with different shaped asperities, under the same rolling condition. The simulating result shows great accordance with the wear laws of asperities of work roll surfaces in industry production. It also shows that, discrete element method can be a valued method which worthies concerns and developments to simulate the microscopic wear of asperities of work roll surface.