Simulation Of The Process Of Large-scale Roll-formed Tubular Member

With the rapid progress in the field of petrochemical and nuclear power,large equipment and scale rapid development have become the key developmenttrend in the field of related bigness. In hydrogenation reactor of thepetrochemical industry, high parameter and large-scale of pressure vessels aremore significant. The large cylindrical parts as an important part of the pressurevessels, its comprehensive performance requirements are also more and morehigh. Large-scale makes the production and manufacturing face the biggerchallenge. For a long time, large cylindrical parts production in our countryadopts free forging process. Not only was it low efficiency, but also bigdeviation of shape and big wall thickness deviation, which lead to energyconsumption, severe consumables. Therefore, to explore and study new formingtechnology of large cylindrical parts forming is imperative.Rolling technology of a new forging-rolling process for large cylindricalparts was mainly researched in this paper. Through to the design of theworkpiece and the rolling pass, and the selection of process parameters ofrolling, a large cylindrical parts model of the rolling technology has beenestablished in the finite element software Simufact to finish the numericalsimulation analysis. Distributions of plastic deformation area and thetemperature and variations of the rolling force and the cylinder diameter in theprocess of rolling were obtained.Based on the theory of ring rolling model, a rolling model of largecylindrical parts was established to study the relationship between thecylindrical rolling reduction and the permeability, the distribution ofdeformation area was analyzed. In the rolling process of cylindrical parts and theeffect of core roller reduction on permeability of cylindrical can be got in theprocess. Compared with penetration calculation by the rule of thumb, thevalidity of stimulation results of the forging permeability was confirmed. Tonon-uniformity of the plastic deformation and temperature non-uniformity as evaluation index, the quality of the cylindrical rolling is analyzed. By changingangular velocity of the driven roller and core roller diameter, the distribution ofeffective plastic strain and temperature in rolled cylindrical pieces had beenattained, which have the effect of optimization parameters, also providetheoretical basis for further research and development.