关键词: 磨料水射流, 钢轨修复, 参数优化, 响应曲面法

Abstract:  In order to improve the efficiency and repair quality of abrasive waterjet repairing rails and reduce energy loss， the orthogonal experiments on abrasive waterjet repairing rails were carried out on Chinas U71Mn 60 kg/m heavy rail， based on central composite design（CCD） response surface method. The repair quality regression model of rails was established， the influences of each processing parameter on the repair quality was studied. The results show that the nozzle feed rate has the more significant effect on the profiles， the surface roughnesses of cutting ground zones and the surface roughnesses of deformation ground zones than that of waterjet pressure. And two sets of processing parameter optimization combinations are obtained under different applicable conditions， one focuses on the repair quality， the other focuses on efficiency of repairing. It is found that the errors of the predicted values and the experimental values of the profiles， the surface roughnesses of the cutting ground zones and the surface roughnesses of the deformation ground zones are less than 6%， and the average error is less than 4%. It is proved that the model may effectively predict the surface roughnesses of the cutting surfaces， which lays a theoretical foundation for the practical applications of abrasive waterjet repairing rails.

Key words: abrasive waterjet, rail repair, parameter optimization, response surface method