The Control On Billets Elaboration And Extrusion Forming Technology Of The Pedestal Of Spray Nozzle Of Oxygen Lance

In this article, based on the early experimental works, the influence of die structure on metal flowing in deformation process has been studied with both physical modeling and numerical simulation methods, regarding the pedestal of spray nozzle of oxygen lance as the research object. Those are used to solve metal filling uniformity, in order to reasonable optimize the forming process of part to achieve greater material savings, improved microstructure, improving internal quality, reduce the cost of production.Being the foundation of former numerical simulation, the rigid-plastic finite element model of the dies and billets which would be used in practical procession has been built at first, and the mesh of billets, the material parameters, the definition of interface condition between die and work pieces, forming velocity have been defined either.The extrusion process of the spray nozzle of oxygen lance has been simulated with numerical simulation of finite element method (FEM).The influence of both the billets and the structural parameters of die which impact equivalent strain and equivalent stress have been discussed at first, then the reasonable process parameters have been confirmed, the forming process of part and the structure of die have been optimized either.The analysis shows that it is beneficial to forming when the diameter of billets is 380mm, the extrusion temperature is 850℃, and adding small cones in the bottom of the die-sinking to trim convex plate.Based on the result of the FEM simulation, the extruded forming technology of the pedestal of spray nozzle of oxygen lance has been optimized, and the physical experiment has been achieved either.The result shows that it is feasible to produce the parts with optimized forming technology, which improved the utilization of material and internal structure property.The surface of extrusion die has not appeared cracks after mass production.Comparing with the die designed according to previous technologies, it is obviously enhanced the service life.