南京航空航天大学学报（英文版）2025，Vol.42Issue(1)：123-136,14.DOI:10.16356/j.1005-1120.2025.01.010
基于7075铝合金深孔镗削的颗粒阻尼减振镗杆试制与实验研究
Trial-Manufacture and Experimental Study of Particle Damping Boring Bar for Deep Hole Boring of 7075 Aluminum Alloy
摘要
Abstract
7075 aluminum alloy is often used as an important load-bearing structure in aircraft industry due to its superior mechanical properties.During the process of deep hole boring,the boring bar is prone to vibrate because of its limited machining space,bad environment and large elongation induced low stiffness.To reduce vibration and improve machined surface quality,a particle damping boring bar,filled with particles in its inside damping block,is designed based on the theory of vibration control.The theoretical damping coefficient is determined,then the boring bar structure is designed and trial-manufactured.Experimental studies through impact testing show that cemented carbide particles with a diameter of 5 mm and a filling rate of 70%achieve a damping ratio of 19.386%,providing excellent vibration reduction capabilities,which may reduce the possibility of boring vibration.Then,experiments are setup to investigate its vibration reduction performance during deep hole boring of 7075 aluminum alloy.To observe more obviously,severe working conditions are adopted and carried out to acquire the time domain vibration signal of the head of the boring bar and the surface morphologies and roughness values of the workpieces.By comparing different experimental results,it is found that the designed boring bar could reduce the maximum vibration amplitude by up to 81.01%and the surface roughness value by up to 47.09%compared with the ordinary boring bar in two sets of experiments,proving that the designed boring bar can effectively reduce vibration.This study can offer certain valuable insights for the machining of this material.关键词
7075铝合金/镗杆/减振/颗粒阻尼Key words
7075 aluminum alloy/boring bar/vibration reduction/particle damping分类
金属材料引用本文复制引用
黄仪,韩建鑫,董庆运..基于7075铝合金深孔镗削的颗粒阻尼减振镗杆试制与实验研究[J].南京航空航天大学学报（英文版）,2025,42(1):123-136,14.基金项目
Acknowledgement This work was supported by the Scien-tific Research Program of Tianjin Education Committee(No.2022ZD030). （No.2022ZD030）
