摘要
重型机床的动态特性主要受结合面和基础的影响,其性能直接关系到工件的加工精度。采用分形理论建立结合面节点刚度模型,通过计算各节点压强值,从微观角度采用MATRIX27矩阵单元将节点刚度值导入宏观结合面中;然后建立了考虑结合面的重型机床-基础有限元模型,采用ANSYS对重型机床-基础系统振动模态及谐响应进行仿真分析;最后对比现场实验验证了模型的正确性。基于该模型研究了箱基轮廓尺寸对重型机床-基础系统动态特性的影响规律,通过上述模型能够验证重型机床-基础系统结构的合理程度,为进一步改进指出方向。
Dynamic property of heavy-duty machine tools directly connects with its machining accuracy, which is effected by joint surface and foundation. The stiffness and damping values of joint surface were obtained by fractal theory. In this way, the stiffness and damping values of each node with uneven load under the microstate of joint surface were introduced into a finite element model. Then, considering boundary conditions of joint surface, heavy duty machine tools-foundation system model was created. The modal analysis of the system was done by ANSYS FE software. Finally, the system modeI was validated by field measurement. The model was used to study effect to dynamic characteristics by changing the outline size of box foundation. The correctness of the mechanism design was evaluated, and the direction was pointed out for further improvement.
出处
《机床与液压》
北大核心
2016年第22期35-38,共4页
Machine Tool & Hydraulics
基金
辽宁省教育厅科学研究一般项目(L2014589)
关键词
重型机床-基础系统
动态特性
结合面
现场实验
仿真分析
Heavy duty machine tools-foundation system
Dynamic characteristics
Joint surface
Field measurement
Simula- tion analysis
