激光加工机床定梁龙门系统设计与模态分析研究

Design and Modal Analysis of Fixed Beam Gantry System for Laser Machining Machine Tool

以FPC超精细激光加工机床的定梁龙门系统为研究对象,采用有限元分析方法在ANSYS平台上建立其有限元模型,仿真研究了龙门系统施加载荷情况下的极限应力和位移;基于模态分析理论,求解定梁龙门系统前4阶固有频率及振型,分析其结构设计的合理性。仿真结果表明:施加载荷情况下,龙门系统的最大应力为49 935.8 N/m~2,远小于大理石的屈服强度;最大变形量为0.000 390 92 mm,均满足设计要求;第2阶固有频率达到463.48 Hz,远大于工作频率,具有极大的刚度,可有效避免机床床身发生共振,确保机床工作稳定性。

Taking the fixed beam gantry system of the FPC ultra-fine laser processing machine tool as the research object, the finite element model is established on the ANSYS platform by the finite element analysis method, and the ultimate stress and displacement of the gantry system under the applied load are simulated and studied. Based on the modal analysis theory, the first four natural frequencies and mode shapes of the fixed beam gantry system are solved, and the rationality of its structural design is analyzed. The simulation results show that when the load is applied, the maximum stress of the gantry system is 49935.8 N/m~2, which is much smaller than the yield strength of the marble;the maximum deformation is 0.00039092 mm, all of which meet the design requirements. The second-order natural frequency reaches 463.48 Hz, which is much larger than the working frequency, and has great rigidity, which can effectively avoid the resonance of the machine bed and ensure the stability of the machine tool.