Crossbeam is the main moving part of bridge gantry milling machine,and its structure design directly affects the working performance of machine tool.Therefore,a structure design and optimization method for crossbeam based on orthogonal experimental design,improved fuzzy comprehensive evaluation and size sensitivity analysis was proposed.According to the multi-factor and multi-level characteristics of crossbeam structure design,eight kinds of representative parameter combinations were selected as the structure design scheme of crossbeam by orthogonal experimental design.The improved fuzzy comprehensive evaluation method was used to process the finite element simulation data,so that the optimum selection scheme of crossbeam with parameters combination"box in box-well-20 mm-linear guideway"was determined.And the sensitivity analysis and optimization of its key design sizes were carried out to obtain the specific of crossbeam structure design size.After optimization,the static performance and anti-vibration performance of crossbeam were improved obviously while the lightweight design of crossbeam was also realized,which played a guiding role in the actual manufacture of machine tool crossbeam.The research result shows that the proposed structure design and optimization method for crossbeam has high engineering practicability,and it also provides a new idea for the design of other key parts of CNC machine tools.
Journal of Engineering Design
bridge gantry milling machine
orthogonal experimental design
finite element analysis
improved fuzzy comprehensive evaluation method