基于Workbench的龙门五轴联动机床多种位姿下的静动态分析

Static and dynamic analysis of high speed live-axis gantry machine with a variety of poses based on Workbench

针对龙门机床运行过程中在外载荷影响下因刚度不足而产生的震颤问题,利用Solidworks建立虚拟样机,导入Workbench,并按照实际工况施加预应力对模型进行了结构静力、自由模态和预应力模态分析.结果表明,外载荷使机床的固有频率明显减小,振型变大,因此在实际工作中不可忽视外载荷对机床振动的影响.

Gantry machine produces vibration because of the insufficient stiffness and the impact of external load during the process of operation.We use Solidworks to establish virtual prototype,imports to Workbench and prestresses the five-axis machine tool according to actual condition.Then by doing static structure analy-sis,free modal and prestress modal analysis,External load significantly makes the natural frequency decrease and largens the mode shape.Therefore,the impact of external load on machine＇s vibration cannot be underesti-mated in the actual work.