高强栓接结构对分段式重载横梁动态特性的影响

摘要

针对高强栓接连接的超跨距分段式横梁与整体式横梁，以某机床厂生产的重型龙门数控机床三段式栓接重载横梁为研究对象，在横梁3种安装方式下分别对其进行动力学实验，并且利用三维建模软件与有限元软件对相应的整体式横梁进行了建模与分析．通过对照测试结果与分析结果，探究了栓接结合部对横梁动态特性的影响．结果表明：分段式横梁在3种情况下的动力学特性与整体式横梁并无显著差别，横梁栓接结合部对横梁动力学特性的影响较小．%Research on the dynamic discrepancy of the integral type and multi-section crossrail, jointed by the high-strength bolt is required. This paper focuses on the dynamic characteristics of the three- section bolted crossrail. The dynamic experiment of the crossrail is carried out at three installation conditions, such as free-free condition, fixed on machine tool, and working condition. At the same condition, the integral crossrail, which ignore the bolted joint, is modeled by three-dimensional software and analyzed by the finite element method （FEM）. By comparing the experiment and analysis results, the influences of the bolted joints on three-session beam are explored and no signification discrepancy of the integral and three-section crossrail is found in dynamic characteristics. Therefore, the bolted joints have slight influence on the three-section crossrail, and the conclusion provides an experimental basis for the design, analysis and optimization of the three-section crossrail.