电流变液减振器在深孔颤振控制中的试验研究

Experimental study on electrorheological fluid damper in deep hole flutter control

针对深孔加工中的颇振问题,结合深孔加工的特点,设计了一种基于混合模式的电流变液减振器。利用电流变液在电场强度下能够快速、连续、可逆地改变其粘度和抗剪屈服应力的特性,可实现对减振器可控阻尼力的连续、无级调节。通过对减振器可控阻尼力的数值仿真,分析了阻尼力的影响因素。在Z2120型BTA深孔钻镗床上进行了切削颤振控制试验,对比了不同电场强度下钻杆振动的振幅和被加工孔的表面粗糙度。试验结果表明:在电场作用下,混合模式电流变液减振器能够有效地减小钻杆振动的幅值和明显减小被加工孔的表面粗糙度值。但是不同电场作用下,减振器的减振效果不同。

Aiming at the problem of flutter in the deep hole processing, combined with the characteristics of deep hole processing, a variable damper based on mixed mode current was designed. Using electrorheological fluid under the electric field intensity can fast, continuous and reversible change its viscosity and shear yield stress characteristics, which can realize controllable shock absorber damping force of continuous, stepless adjustment. Through the numerical simulation of shock absorber controllable damping force, the influence factors of damping force was analysed. The drill pipe vibration amplitude under different electric field intensity and surface roughness of the hole processed were compared in the cutting chatter control experiment which was carried on the type Z2120 BTA deep hole drilling and boring machine. The test results show that： in the electric field, mixed mode electrorheological fluid damper can effectively reduce the vibration amplitude of the drill pipe and significantly reduce the surface roughness of the machined hole. But, under the effect of different electric field, the shock absorber＇s damping effect is different.