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根据平均流量模型和微凸体模型建立了冷轧铜合金混合润滑状态的理论模型。计算了使用不同运动粘度的乳化油,不同初始油相浓度的乳化液和在不同压下率条件下,轧制变形区的油相浓度,流动压力和接触面积。由计算结果可知,在冷轧过程中为使乳化液起到好的润滑作用和冷却效果,乳化油的运动粘度选在40~50 mm2/s之间,乳化液的初始油相浓度选在在0.02~0.05之间,道次压下率选择在30%。为进一步验证模型,利用四球摩擦磨损试验检测了乳化液的最大无卡咬负荷,确定乳化油的运动粘度和乳化液的初始油相浓度;通过观察轧后铜合金表面形貌确定轧制道次压下率,通过实验研究发现,实验结果和计算结果一致,验证了模型的准确性。乳化液润滑模型为轧制过程中乳化油运动粘度、乳化液初始油相浓度和道次压下率的选择提供了参考依据。
Based on the average flow model and asperity model, the theoretical model of the mixed lubricating state of cold-rolled copper alloy was established. The emulsified oil with different kinematic viscosity, emulsions with different initial oil phase concentrations and the oil phase concentration, flow pressure and contact area under different reduction rates were calculated. It can be seen from the calculation results that the kinematic viscosity of the emulsified oil is selected to be between 40 and 50 mm2 / s in order to make the emulsion lubricate and cool effectively during the cold rolling process. The initial oil phase concentration of the emulsion is selected between 0.02 to 0.05, the pass reduction rate of 30%. In order to further validate the model, the maximum card-free bite load of emulsified liquid was tested by four-ball friction and wear test to determine the kinematic viscosity of emulsified oil and the initial oil phase concentration of emulsified oil. The rolling path was determined by observing the surface morphology of the rolled copper alloy Through the experimental study, it is found that the experimental results are consistent with the calculated results, which verifies the accuracy of the model. Emulsion lubrication model for the rolling process of the kinematic viscosity of emulsified oil emulsion initial oil phase concentration and pass reduction choice provides a reference.