The Analysis And Optimization Of A Large Span Machine Tool's Beam

With the much lighter requirements of the machine's structure and the fast development of Extreme manufacturing, larger machine tools become the main developing tide. Though steel structure develops quickly inside, only few large span surporting beams are used on machine tools, the research is mostly blank.The developing precess of steel structure and the beam's traditional design method are introduced in this thesis, then the structure of one machine tool's beam is analyzed and optimized, also does some valuable work for the future design,the main results are:Firstly, according to the real condition, with the FEA (finite element analysis) software ANSYS, this thesis predigests the beam and it's load, analyzes the main out weight of the beam (the front door and the back shield), gets the main load of the beam.Secondly, with APDL language, the beam is built by parametric modeling, through controlling node's number, automatic determining the load position and forcing loads are finished, the static, modal, buckle, dynamic condition are analyzed, the results that the rigid distortion and the whole stability are suitable but the transverse stability presents bad are obtained.Thirdly, analyzes the influence of beam's parameters on the beam's distortion, for example, when the parameter H1 gets larger, the UY becomes smaller, and the influence of the beam's distortion on the frontdoor.Finally, presents an optimal design method with the definite beam displacement and span restriction.gets the optimal results.A normal method is provided to the future design and analysis of this style beam by this thesis, the method how to analyze and judge the rationality of this large span beam is given, finally the beam is optimized,...