摘要
航空结构中的薄壁件由于刚性差,在加工中容易发生变形、让刀等现象,对加工精度及表面质量构成严重影响。针对上述问题,基于电磁感应原理,笔者研究设计了适用于薄壁件的铣削加工减振装置,将工件的振动应用于磁感线切割,通过作用反力的产生来实现工件减振的目的,并推导了磁铁在铜管内运动时的电磁感应阻尼力,结果表明阻尼力与相对运动速度成线形关系,但方向相反。冲击实验表明,该减振装置能显著缩短薄壁件的振荡时间;颤振稳定域仿真表明,该装置可将薄壁零件的临界稳定切深从0.4mm提高到5.1mm。最后,结合切削实验对该装置的抑振效果进行验证。
There are many thin-walled structures in aircraft.Due to the low flexibility of structures,workpiece deformation and deflection occur easily during the machining,which causes low precision and low surface quality.Therefore,much has been done to investigate the machining process,deflection prediction and control technology of thin-walled structure machining.However,real application in the industry is still a challenge.In this paper,a vibration suppression device for the thin-walled structure is investigated and designed based on electromagnetic induction.The workpiece vibration is utilized in order to cause a change in the magnetic flux through the closed circuit,so the resulting magnetic force can contribute to the suppression of workpiece vibration.The magnetic force resulting from the movement of the magnet inside the copper tube is formulated.It is shown to vary linearly with workpiece velocity in the opposite direction.Impact tests show that the device can sharply attenuate the oscillation time,and the chatter stability simulation shows that the stability limit of the thin-walled workpiece is increased from 0.4mm to 5.1mm.Cutting tests are carried out to verify the final vibration suppression effect.
出处
《振动．测试与诊断》
EI
CSCD
北大核心
2015年第3期429-433,586,共5页
Journal of Vibration,Measurement & Diagnosis
基金
国家自然科学基金资助项目(51205013)
教育部博士点基金资助项目(20111102120048)
中央高校基本科研业务费资助项目(YWF-13-D2-HK-21
YWF-12-LZGF-179)
关键词
薄壁件
电磁感应
铣削
振动抑制
thin-walled structure
electromagnetic induction
milling
vibration suppression
