Research On The Large Flange With Four-point Bending JCO Forming Process

With the status of wind power in the national energy strategy in increasing, as animportant connection part of wind turbine tower, large flange is also increasingly indemand. The traditional flange manufacturing process has been unable to meet modernproduction requirements in product quality, production efficiency and energy consumptionetc. JCO technology is widely used in large longitudinal welded pipe forming, whichbelongs to the multiple step incremental forming. Four point bending JCO forming isbased on the current JCO technology, this paper will introduce it to the production of largeflange ring.Based on the mechanical model of four point bending, using the finite elementsoftware ABAQUS, four-point free bending3D finite element simulation model isestablished in this paper. Their stress and strain characteristics are analyzed by simulationresults. At the same time, analysis the punch radius, die radius, punch span and die span ofthe different factors, finds out the effects of all the factors have on forming force, bendingradius and the radius after springback. Verify the reliability of the model by thecomparison of simulation results with experimental results.In the base of the specifications for flange ring, whose outer diameter is332mm,inside diameter is300mm and the height is10mm. Finite an element simulation model ofthe four point bending forming process of JCO domain. Experiments on simulationparameters, using three-coordinates measuring machine to measure the radius of theexperimental part, and compared the fitting results and simulation results, verify thecredibility of the model and the reliability of the process. The simulation results of thestress and strain field are analyzed, discussed the influence of different process parameterson the formed flange ring ovality.Through the study of the four point bending JCO forming technology, provides a newtechnology for manufacturing large flange. The analysis results provide credible data forfurther research and practical production.