Static Simulation Analysis And Structural Optimization Design Of Braced Frame For Vertical-horizontal Conversion Woodworking Milling Machine

Because of the fine design of wood products,the woodworking milling machine is required to have good machining accuracy.Braced frame plays an important role in supporting tool feed system,and its static characteristics directly affect the machining accuracy and processing quality.In this paper,the braced frame of vertical-horizontal conversion woodworking milling machine is taken as the research object,and its forced deformation were analyzed in detail,the optimization and improvement of braced frame is completed by combining the design requirements.The specific research contents are as follows:Firstly,the force diagrams of the braced frame under vertical working condition and horizontal working condition were established,the constraint reaction forces of the braced frame under vertical working condition and horizontal working condition were solved by principle of force method and typical equation of force method,and the internal forces of the structure under two working conditions were solved.Then,according to the calculation formula for displacement of space rigid frame,tool offset calculation models in the whole process of two working conditions were established,which provided effective calculation method for engineering calculation.Secondly,the finite element models of braced frame were established under vertical-horizontal condition,the static simulation and analysis of the non cutting load and the cutting load on the vertical and horizontal working condition braced frame were carried out respectively,the tool offset data with no cutting load and cutting load during the whole process of two working conditions were obtained.Thirdly,the tool offset data without cutting load and cutting load during the whole process of vertical and horizontal condition were analyzed and compared respectively under vertical and horizontal condition,which provided a reference for reducing machining position error of tool.The tool offset data of the cutting load in the two working conditions were analyzed respectively in detail,which provided the basis for the optimization of the structure.The validity of the computational model is verified by the difference percentage method.At last,by means of the method how to establish mathematical model of structural optimization design,taking the wall thickness of the column and moving beam in the braced frame as the design variable,taking the variation range of the wall thickness of the column and moving beam and the precision of the design as constraint condition,taking the lightest overall quality of braced frame as the optimization goal,the mathematical model of structural optimization design of braced frame was established.The structure of braced frame under vertical and horizontal working condition were optimized design respectively,the optimal scheme was selected by combining the optimization results of two working conditions,and the machining precision of braced frame after the optimizing were evaluated.