薄壁零件刚性差,在铣削过程中极易出现颤振,且随着材料的快速去除,其动力学特性快速变化导致切削稳定性多变。研究基于粘滞阻尼原理的被动抑振技术,以增加薄壁零件阻尼、提升切削稳定性。以空气为例作为填充介质,对所设计阻尼器进行模态测试和激振实验。模态测试表明该阻尼器能大幅提升薄壁件阻尼,振动峰值下降约60%,且对多阶振动模态具有抑制作用;激振实验表明薄壁圆筒零件振动加速度下降36%-67%。
Abstract
Chatter tends to occur during milling process of thin-walled parts due to its poor stiffness. Owing to the rapidly removal of materials, the quick changes in dynamic characteristics results in variable cutting stability. The current research focuses on the passive vibration suppression technology based on the principle of viscous damping in order to increase the damping of thin-walled parts and improve cutting stability. By taking air as an example as the filling medium, the modal test and excitation experiment of the designed damper are carried out. Modal tests show that the damper can significantly improve the damping of thin-walled parts. The vibration peak is reduced by about 60%, and the effect on the suppression of multi vibration modes is observed. The results of the excitation experiment show that the acceleration of thin-walled cylinder parts decreases by 36%-67%.
关键词
薄壁件 /
铣削 /
阻尼 /
粘滞阻尼
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Key words
thin-walled workpiece /
milling /
damping /
viscous damping
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脚注
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