Technological Experiments of Ultrasonic Deep Rolling with Longitudinal-torsional Vibration

Abstract

Abstract: Q235 steel was processed by UDR with LTV(UDR-LTV) based on orthogonal tests. The effects of processing parameters on surface roughness and surface micro hardness were studied. The prediction models for surface roughness and micro hardness were constructed based on the experimental results. The experimental results show that UDR-LTV may lead to a marked reduction the surface roughness and a considerable increase in surface micro hardness. The values of surface roughness increase first and then decrease with the increment of the static pressure; and increase markedly with the increment of the feed-rate, and change a little with the increment of the rolling speed. Meanwhile, the feed-rate has a marked effect on the surface roughness. The values of surface micro hardness increase with the increment of the static pressure; and fluctuate a little with the increment of the feed-rate and the rolling speed. And the static pressure has a marked effect on the surface micro hardness. t-test and the coefficient of correlation were calculated. The calculated results indicate that the surface roughness are most affected by the interaction of the feed-rate and the static pressure, and the surface micro hardness are most affected by the interaction of the static pressure and the rolling speed. The optimal parameters for the lowest surface roughness and highest micro hardness obtained by the orthogonal test are close to that obtained by the prediction models, which indicates that the prediction models are reliable.

Key words: ultrasonic deep rolling(UDR), longitudinal-torsional vibration(LTV), surface roughness, micro hardness

摘要： 采用正交试验法对Q235钢端面进行了纵-扭复合振动超声深滚加工，探索了工艺参数对表面粗糙度和显微硬度的影响，并基于试验结果构建了表面粗糙度和显微硬度的预测模型。试验结果表明：经纵-扭复合振动超声深滚加工后，工件表面粗糙度值显著减小，而显微硬度有大幅提高；表面粗糙度值随静压力增大先增后减，随进给量的增大而急剧增大，而随滚压速度的增大变化不明显，且进给量对表面粗糙度的影响最显著；显微硬度随静压力的增大而提高，随进给量和滚压速度的增大有微小波动，且静压力对显微硬度的影响最显著；基于t-检验与相关系数计算结果发现，进给量与静压力的交互作用对表面粗糙度的影响最大，而静压力与滚压速度的交互作用对显微硬度的影响最大。基于正交试验结果和预测模型获得了最优工艺参数，两者的结果接近，表明预测模型可靠。

关键词: 超声深滚, 纵-扭复合振动, 表面粗糙度, 显微硬度

CLC Number:

TB559
TH113

Zheng Jianxin, Hou Yali. Technological Experiments of Ultrasonic Deep Rolling with Longitudinal-torsional Vibration[J]. China Mechanical Engineering.

郑建新, 侯雅丽. 纵-扭复合振动超声深滚加工工艺试验[J]. 中国机械工程.

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