Abstract
As hardness of the work-surface working in the train axle has a direct relationship to train axle's life-time, a surface strengthening technology is necessary to strengthen the hardness of the work-surface. In this study, ultrasonic surface strengthening (USS) method was proposed, and its fundamental characteristics were investigated experimentally. Concretely, the influence of many principal parameters, namely workpiece rotational speed n, feed rate f and extrusion amonut P of the tool, on the train axle with material 30CrMoA were investigated. The experiment results show that (1) surface roughness decreases significantly after USS, and lowest surface roughness can be obtained under the condition of rotational speed n=610 r/min, feed rate f=0.2mm/r and extrusion amount P=130μm; (3) hardness after USS bigger than that of before USS up to 24%, under the condition of rotational speed n=610 r/min, feed rate f=0.2mm/r and extrusion amount P=180μm; (4) the residual stress value can be adjusted after USS, the value of residual stress in the work-surface can reach -950Mpa after USS and the depth of the residual compressive stress layer can reach nearly 2mm. This study confirmes that the unltrasonic strengthening technology is a highly effective processing method for improving the surface quality of train axle.
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