Research On Precise Modeling And Process Optimization Of Large Cylindrical Forgings

Heavy cylinder forging are key components of national major technicalequipment. It have cannot be ignored position in the energy, iron and steel, anddefense industry.The majority is working under high temperature and high pressureenvironment, so that the parts have high requirements to organization andcomprehensive mechanical properties. But the current forging process research ofcylindrical forging are all in a single, qualitative level. The finite element model iscomparatively large difference with the actual situation in the process of simulation.Therefore parameter inversion and optimization design of forging process is carriedout for of heavy cylindrical forgings which are of great significance. This paperstudying Simulation of heavy cylindrical forging forging process,and the research iscarried out as following:(1) The finite element model of Cylindrical shaft forging reaming process wasestablished.To set up inversion of the heat transfer coefficient and friction factor thatneeded for the relatively accurate finite element model by homotopy method becauseof the global convergence. The curve estimate-Newton correction homotopy algorithmwas proposed because the tangent direction estimate of Euler was instead by the curveestimate.This method can reduce the amount of calculation because of reducing thecall of the finite element model.(2) To analyze the effect of spindle rotation angle and the forging surfacetemperatures to the spindle bore hole process by accurate finite element model. Themost important factor to influence the quality of forging is height reduction. Spindlerotation angle and the forging surface temperatures have important influence toforging forging penetration and forming force.(3) Height reduction, spindle rotation angle and the forging surface temperaturesas desing variables in Latin hypercube experimental design, the difference of theequivalent stress between the main deformation area and the connecting region ofdeformation as the objective function. Fitting the objective function by radial basisfunction. After that,to optimize the functionthe by genetic algorithm, and analyze theinfluence of various parameters on the common forging quality.