细长孔阻尼抑制深孔镗削颤振的研究

Study of Damping of Slender Holes Inhibition Based on Deep Hole Boring Chatter

针对深孔镗削加工中的颤振问题,设计了一套具有多个细长孔的双镗杆刀具系统结构,通过细长孔阻尼作用,抑制镗削加工过程中刀具系统的颤振。根据流体力学环形间隙流动以及细长孔阻尼理论,建立双镗杆刀具系统结构的数学模型,利用MATLAB进行数值模拟;利用Fluent软件对双镗杆刀具系统结构的内部流场进行仿真,得出流场域的阻力系数增大;建立镗削过程中的振动模型,运用Simulink对其进行动力学仿真得到振动时域图,直观显示了切削液流经具有多个细长孔的阻尼通道能有效抑制深孔镗削过程中的颤振。

As for the chatter problem of deep-hole boring,a pair of boring bar with multiple slender hole in cutting tool systems structure is designed,which restrains the vibration of the tool system by the damping of slender hole. According to annular clearance flow of fluid mechanics and the theory of slender hole damping,a mathematic model of the double boring bar cutting tool system structure can be established,and then a numerical simulation by MATLAB is set up. By using Fluent,the simulation to internal flow field of double boring bar tool system structure is built,which is concluded the drag coefficient of the flow field increases. When the boring process of vibration model is established,the dynamic simulation to the model by using of the simulink is built. The time-domain diagram vibration of the simulation visually shows that the cutting fluid flowing through a multiple damping channel tenuous hole can effectively restrain the chatter in the process of deep hole boring.