Study Of Bending And Upsetting Forming Technics On DTR Principle Of Full Fiber Crankshaft

Marine crankshaft is one of important part of marine engine,Bending and upsetting forging is an essential manufacturing technologies to produce marine crankshaft. This article researches the bending and upsetting forming process of No.305 marine crankshaft deeply using the way of combining numerical simulation and physical test based on DTR principle of bending and upsetting forming.Using nonlinear FEM software DEFORM-3D as a analytics platform and adopting rigid-plastic finite element theory, a thermo-mechanical coupling numerical simulation research is conducted on the bending and upsetting forming process of No.305 marine crankshaft. The compacting mechanism in the process of bending and upsetting forming process of large marine crank is pointed, at the same time, the changing rules of distribution of temperature,corner of the crankshaft, upsetting force and bending force in the process of bending and upsetting are analyzed. The defect of crank after forming is pointed out. The main reason of finding defect after forming is also discussed. Therefore, the forming quality evaluating indicator is fixed. Based on thermo-mechanical coupling numerical simulation model and adopted single factor cyclical method, the influence rules of the friction, displacement matching relationship, technological parameter of mould and blank on forming quality are analysed and the best technological parameter is fixed.Based on the bending and upsetting forging equipment on DTR principle, 1/6 lead check bar is used to carry on experiments on forming technics above mentioned. The results show that silumation and experiments results fits better. It indicates that numerical simulation study result is reliable. The forming process and correlation parameter provide important reference value to the production of DTR bending and upsetting forging equipment and the fix of manufacturing technique.