环保型润滑添加剂对冷轧板带钢轧制液润滑性能的影响

Effect of Environmental Lubricating Additives on Rolling Lubrication of Cold Strip Rolling Emulsions

利用正交试验设计分析了乳化剂质量分数、植物油质量分数、润滑添加剂种类对冷轧轧制液稳定性的影响。考察了环保型润滑添加剂钼氨络合物、水基钼化合物、含氮硼酸酯对轧制液摩擦学性能和轧制润滑性能的影响。结果表明,影响轧制液稳定性因素按效果大小排列的顺序为植物油质量分数、乳化剂质量分数、润滑添加剂种类;轧制液中添加质量分数2%的含氮硼酸酯后,能更好地改善其摩擦学性能,与添加了传统润滑添加剂的轧制液相比,油膜强度(PB)提高了13%,摩擦系数降低了13%～17%,磨斑直径降低了10%～15%,摩擦系数随时间的延长呈降低趋势并趋于稳定;同时表现出优异的冷轧润滑效果,平均轧制力降低了14%～19%,带钢最小可轧厚度得到降低,轧制过程的摩擦系数降低了19%～25%,轧后板带钢表面质量得到明显提高。

Effects of the mass fractions of emulsifier and vegetable oil, lubricating additive on stability of rolling emulsion were investigated by orthogonal test. The tribological characteristics and rolling lubrication performances of the rolling emulsions with molybdenum ammonia complex （MAC）, water-based molybdenum compound （WMC） and borate ester containing nitrogen （BECN）, respectively, were investigated by a four-bail machine and cold roiling test. The results showed that the ranking of the factors influencing the stability of rolling emulsion was the mass fraction of vegetable oil, the mass fraction of emulsifier, lubricating additive. When rolling emulsion doped with BECN of 2% mass fraction, its tribological characteristic and lubrication performance could be improved. Comparing with the rolling emulsions with traditional lubricating additives, the intensity of oil film （PB） was improved by 13%, friction coefficient was reduced by 13%-17%, friction coefficient was more stable with the extension of time, worn scars diameter （WSD） was decreased by 10%-15%. At the same time, excellent lubrication performance was obtained, in which rolling force was diminished by 14%-19%, the minimum rolled thickness was reduced, friction coefficient in deformation zone was decreased by 19%-25%, the surface qualities of rolled steel strips were improved obviously.