Ultrasonic Surface Strengthening of Train Axle Material 30CrMoA
Ultrasonic Surface Strengthening of Train Axle Material 30CrMoA
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DOI：
10.1016/j.procir.2016.03.007
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发表时间：
2016
期刊：
影响因子：
--
通讯作者：
Qinjian Zhang;Jianguo Cao;Huiying Wang
中科院分区：
文献类型：
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作者：
Qinjian Zhang;Jianguo Cao;Huiying Wang
由于在车轴内工作的工件表面硬度直接关系到车轴的使用寿命，因此需要采用表面强化技术来提高工件表面的硬度。提出了超声表面强化（USS）方法，并对其基本特性进行了实验研究。具体研究了工件转速、进给速率和刀具挤压量等主要参数对30CrMoA材料车轴的影响。实验结果表明：(1)搅拌后表面粗糙度显著降低，在转速n=610 r/min、进给量=0.2 mm/r、挤压量tp =130 μm时，表面粗糙度最低；(3)在转速n=610 r/min，进料速度=0.2 mm/r，挤压量tp =180 μm的条件下，淬火后的硬度比淬火前提高24%；(4) USS后残余应力值可调节，USS后工作面残余应力值可达-950 Mpa，残余压应力层深度可达近2 mm。研究证实了超声强化技术是提高车轴表面质量的一种有效的加工方法。
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 speedn, feed ratefand extrusion amonutPof 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 speedn=610 r/min, feed ratef=0.2 mm/r and extrusion amountP=130 μm; (3) hardness after USS bigger than that of before USS up to 24%, under the condition of rotational speedn=610 r/min, feed ratef=0.2 mm/r and extrusion amountP=180 μm; (4) the residual stress value can be adjusted after USS, the value of residual stress in the work-surface can reach -950 Mpa after USS and the depth of the residual compressive stress layer can reach nearly 2 mm. This study confirmes that the unltrasonic strengthening technology is a highly effective processing method for improving the surface quality of train axle.