ROF Furnace Bottom Of Thermal Structure Coupling Numerical Analysis And Process Optimization

Rotary annealing furnace is equipment that used for material for high temperatureannealing heat treatment. The furnace bottom plate of annealing furnace is one of themain consumption parts of ROF furnace, which bearing work piece of heat treatment forhigh temperature annealing treatment. And the service life of the furnace bottom islargely related with thermal stress, which produced under high temperature and workingenvironment.By using ANSYS finite element software and the indirect coupling method toanalysis thermal stress of the annular furnace bottom, the paper reveals the regulation oftemperature and stress field distribution in the process of heat treatment. In hightemperature annealing process, because of the unequal in different regions heatingfurnace bottom, it is easy to produce temperature gap and thermal stress. Thermal stressand the biggest always take place in furnace bottom edge, finally from the edge to thefurnace bottom center cracking gradually, directly affecting the quality steel rollforming. When the crack length of furnace bottom developing to a certain extent,furnace bottom must be scrapped.Firstly, according to the conditions of steel roll forming, fully considering theboundary conditions of convection heat exchange factor. Editing function of theconvection environment temperature and applying convective heat transfer coefficientto simulate the furnace bottom temperature field. And then, on the basis of thetemperature field, using the methods of hot-structure coupling to achieve the couplinganalysis between temperature field and external load, the stress distribution of thefurnace floor could be derived. The results in combination with the practical workingconditions of the furnace bottom plate to analyze the cause of the failure, which haveimportant theoretical guiding role to improve the service life of the furnace bottom.Secondly, based on the prototype of the furnace bottom structure, proposing thetwo parts improved design on the structure of the furnace bottom: petal shaped furnacebottom and pillar location change. Providing theoretical reference for structure design ofthe furnace bottom.At last, putting forward an improvement way of furnace bottom plate production,and this way can effectively improve the service life of furnace bottom plate. The purpose of this paper is on the basis of combining the advantage of the two processes,such as forging and rolling, putting forward a kind of annular furnace bottom forgingforming process of rolling. The results show that the improved rolling furnace bottomsample has uniformity and tiny microstructure, and the mechanical performance is best.