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综合运用摩擦润滑理论、流体力学理论、轧制理论,建立了考虑动态辊缝非稳态润滑过程多因素耦合轧制界面力学模型.该模型综合运用了基于非稳态润滑过程的界面摩擦模型、工作辊运动模型、辊缝应力分布模型构成的界面薄膜约束多因素耦合模型.系统分析了非稳态混合润滑状态下,当压下率和表面粗糙度为定值时不同时刻工作区压应力和摩擦应力的分布情况,以及压下率为定值时工作区压应力、摩擦应力随表面粗糙度和后张应力变化的情况.结果表明:在压下率和表面粗糙度为定值时,当具有较大的后张应力时,工作区压应力和摩擦应力却较低,同时压应力梯度和摩擦应力梯度也相当小,摩擦应力在入口和出口边缘处达到最大,当后张应力减小时,辊缝间压应力和摩擦应力增加,压应力梯度和摩擦应力梯度较大;在压下率为定值而表面粗糙度为变量时,当后张应力较大时,表面粗糙度对工作区中的压应力和摩擦应力影响非常大,辊缝间压应力和摩擦应力随着表面粗糙度的增加而增加,当后张应力较小时,表面粗糙度对工作区中的压应力和摩擦应力影响不太明显.
Based on the theories of friction lubrication, fluid mechanics and rolling, a multi-factor coupled rolling interface mechanical model considering the dynamic non-steady lubrication of the roll gap was established. The interface friction model based on unsteady lubrication was comprehensively used, Work roll motion model and roll gap stress distribution model were established.Under the condition of unsteady mixed lubrication, when the reduction rate and surface roughness are fixed values, the compressive stress in work zone and The distribution of frictional stress and the situation of the compressive stress and frictional stress of the work area changing with the reduction of the surface roughness and the post-tension stress, the results show that when the reduction rate and the surface roughness are constant, With larger post-tension stress, the compressive stress and friction stress in the work zone are lower, and the compressive stress gradient and frictional stress gradient are also quite small. The friction stress reaches the maximum at the entrance and exit edge, The compressive stress and frictional stress increase between the roll gap, and the compressive stress gradient and frictional stress gradient are larger. When the reduction rate is constant and the surface roughness is a variable, When larger, the surface roughness has a great influence on the compressive stress and frictional stress in the work area. The compressive stress and frictional stress between the roll gap increase with the increase of the surface roughness. When the post-tension stress is small, the surface roughness The effect of compressive stress and frictional stress in work area is not obvious.