Research On Structure Optimization Of New Flat Extrusion Container

The flat extrusion container is the best tool for preparing wide thin-walled board profiles.However,due to the incomplete symmetrical structure of the flat extrusion container and the high temperature,high pressure and high friction during the working process,the equivalent stress peak value is too high and the stress distribution is extremely uneven,which causes it to crack easily and affect the service life..In order to improve the service life of the flat extrusion container,it is necessary to reduce the peak value of the equivalent stress and improve the uniformity of the equivalent stress distribution.Therefore,it is necessary to develop a new structure of the flat extrusion container and optimize the structural parameters.This paper uses ANSYS APDL to perform static analysis and thermal-mechanical coupling analysis on two typical tonnage flat extrusion containers(5MN,80MN),respectively,to study the effect of thermal stress on the peak equivalent stress.It is found that the participation of thermal stress can slightly reduce the peak equivalent stress of the flat extrusion container under working conditions,by about 1.2% and 0.9% respectively.Perform statics analysis on 5MN flat extrusion barrels with different characteristics and different parameters,determine the optimal characteristics and parameters for reducing the equivalent stress peak,combine some of the optimal characteristics,and obtain two new combined flat extrusion barrel structures and A new structure of steel wire winding flat extrusion container.Compared with the traditional flat extrusion container,the equivalent stress peak value(including thermal stress)of the two combined flat extrusion containers and steel wire-wound flat extrusion containers under working conditions is reduced by about4.4%,16.2% and 17.3% respectively.Compared with the traditional flat extrusion container,the two combined flat extrusion containers and steel wire-wound flat extrusion containers have reduced equivalent stress peak(including thermal stress)differences by 9.43%,38.29%and respectively under assembly and working conditions 89.69%,making it more stable during frequent loading and unloading.Moreover,the stress gradient at the contact between the two lining bodies is significantly reduced,which improves the uniformity of the equivalent stress.Since the steel wire-wound flat extrusion container has the most significant effect in reducing the equivalent stress peak value and improving the uniformity of the equivalent stress,it is applied to the structural design of the 80 MN flat extrusion container.First,the orthogonal test method is used to determine the optimization plan of the 80 MN steel wire winding flat extrusion container structure parameter,and each group of plans is simulated by ANSYS APDL.Then use the orthogonal test data table to train the BP neural network.Finally,the genetic algorithm is used to optimize the extreme value and obtain a set of optimal structural parameters.The optimal solution was verified by numerical simulation,and it was found that compared with the traditional structure,the equivalent stress peak value(including thermal stress)of the 80 MN steel wire wound flat extrusion container under working conditions was reduced by about 13%,and under assembly and working conditions The equivalent stress peak value(including thermal stress)difference is reduced by about51.5%,the stress gradient between the linings is significantly reduced,and the uniformity of the equivalent stress is greatly improved.