两种材料组合结构的削扁镗杆设计与仿真

Design and Simulation of Cut Flat Boring Bar by Both Materials' Composite Structure

机床的镗刀杆因其受力结构为悬臂梁,极易产生振动,为了研究镗杆的减振问题,根据自激振动耦合型颤振原理以及受迫振动动力消振原理,将普通结构镗杆改进设计为内置减振芯的由两种材料组成的镗杆结构,同时根据将镗杆的小刚度主轴进行合理布置可以减振的原理,对该组合材料结构的镗杆进行了削扁,以期达到最优的减振效果。借助有限元分析软件建立了圆形结构、削扁结构、削扁组合材料结构三种不同类型的镗杆模型,在相同的工况下,对三种镗杆分别做静力学分析和动力学分析,对比仿真实验结果证明了组合材料结构的削扁镗杆具有更佳的减振效果。

Because the stressed structure of the boring bar in machine tool is a cantilever beam, and it is very easy to produce vibration. To study the vibration problem of boring bar, the general structure of boring bar was improved into the built-in damping core boring bar structure composed of two materials, according to the principle of self-excited vibration＇s coupling flutter and forced vibration＇s dynamic damping. At the same time, according to the principle that reasonable arrangement of small stiffness of the boring bar could reduce vibration, the composite structure boring bar was cut flat expecting to reach optimal damping effect. With the aid of finite element method software, three different types of boring bar models were established which were circular structure, cut flat structure and cut fiat composite structure. In the same conditions, statics analysis and dynamic analysis of the three kinds of boring bar were done respectively. It shows that the structure of the composite material cutting flat boring bar has better damping effect by comparing the simulation results.