Research Of Equivalent Modeling Approach And Experiment For Beam Shaped Parts

With the development of resource-saving and environment-friendly society,remanufacturing technology has attracted wide attention.The current remanufacturing is mainly focused on surface repairing of parts,and there are few researches on automatic straightening in view of deformed parts.The existing theoretical researches of correction are mainly focused on few types of parts with regular cross sections,which have poor universality.Therefore,aim at beam-shaped bending deformation parts,by the means of equivalent modeling,this paper achieved the section parameters simplification for complex bending distortion parts and the unification of multiply straightening models,which provided theoretical references for the realization of automatic straightening.The equivalent modeling method for symmetrical beam-shaped parts was proposed.Taking the H-section beam as the research object,its equivalent rectangular section beam was obtained.The straightening theoretical models for H-section beam and its equivalent rectangular section beam were established respectively,then the straightening reverse bending curvature equations were also obtained respectively.The straightening reverse bending stroke was presented further.The feasibility of the equivalent modeling method was verified by the contrast of the correction parameters of H-section beam and its equivalent rectangular section beam under the same degree of bending.Finally,the finite element simulations and experiments were used to test the feasibility of equivalent modeling method.For the asymmetric beam shaped parts,taking the U-section beam as the research object,the concept of rectangularity degree was proposed.Based on rectangularity degree,the equivalent modeling was done for U-section beam and its equivalent rectangular section beam was obtained.Based on the rectangularity degree,the straightening models for U-section beams with different cross-section rectangularity degree and their equivalent beams were established respectively,then the straightening reverse bending curvature equations were also obtained respectively.Furthermore,the straightening strokes were obtained.The feasibility of equivalent modeling for asymmetric beam shaped parts was verified by comparing the straightening parameters with the same initial deformation.At last,the finite element simulations and experiments were applied to test the feasibility of equivalent modeling for asymmetric beams.The equivalent modeling method for variable cross-section beam-shaped parts was proposed.Taking the variable cross-section beam with groove as the research object,the equivalent rectangular variable cross-section beam was established.The theoretical models of load-deflection,load-residual-deflection for the equivalent beam were established and the finite difference was used to solve the models.The finite element simulations for grooved variable cross-section beam and its equivalent beam were carried out respectively.By comparing the load-deflection,load-residual deflection curves of finite difference method and finite element method,the theoretical model was validated.By comparing the residual deflections of the original beam and its equivalent beam using finite element simulation under the same pressure stroke,the feasibility of the equivalent modeling method was tested.Finally,experiments were applied to validate the simulation results.The structure of the experimental device was given.The data acquisition system was designed to real-time monitoring the pressure and the bending degree of the parts.The experimental device was made,the three-point bending test of the H-section beam and its equivalent beam、U-section beam and its equivalent beam、variable cross-section beam and its equivalent beam was carried out respectively to verify the feasibility of the equivalent modeling method.