板带钢热轧润滑作用机理及润滑效果

Lubrication mechanism and effects in hot-strip rolling process

通过建立汽化燃烧区对热轧变形区进行分析计算,发现无论在热轧变形区入口处的汽化燃烧区,还是在变形区,油水混合液都没有足够的时间达到燃点,仍以液体形式存在.采用四球摩擦试验机进行了油膜强度和摩擦因数测定并进行长磨试验.磨斑表面观察表明:当轧制油在水中的质量浓度大于2 g.L-1时,润滑状态为边界润滑,该状态下的润滑作用效果取决于油膜强度,并非轧制油的质量浓度.采用2 g.L-1质量浓度进行轧制润滑生产试验,验证了上述研究结果.润滑有效地降低了轧制压力,同时对冷却水污染最小,取得了很好的润滑效果.对于不同的轧制产品与工艺而言,建议轧制油使用的质量浓度应小于10 g.L-1,否则轧制油残留可能引起冷却水污染.

Through the analysis of hot rolling processes by establishing a vaporizing combustion zone, it was found that the oil-water mixture kept liquid and there was not enough time to reach its burning point both in the entry vaporizing combustion zone and deformation zone. Oil film strength tests, friction coefficient tests and long grinding experiments were carried out on a four-ball machine. Wear scars showed that when the mass concentration of the rolling oil in water was more than 2 g·L-1, the lubrication regime was boundary lubrication, in which the lubrication effects depended on the strength of oil films, not oil concentration. Rolling lubrication in production with an oil mass concentration of 2 g·L-1 was tested; it proved the above-mentioned research results. The rolling force was effectively decreased and the cooling water pollution was minimal at the same time. It was recommended that the mass concentration of the rolling oil should be less than 10 g·L-1 for different rolling products and processes; otherwise the rolling oil residues might cause the cooling water polluted.