Welded flange

Welded flange forming process is very complex , especially for large welded flange production cost is great, often need to warm up beforehand . Computer simulation of deformation of the flange is related to the process of raw materials and deformation temperature and the mechanical properties of a mathematical model representation , by means of computer simulation at any instant during deformation and stress-strain state temperature distribution . Process using computer simulation and physical simulation, the two can be mutually supporting and complementary . As welded flange forming process and the physical existence of geometric nonlinear nonlinear problems, so that the main stress method , slip line method and the upper bound method and other traditional methods in the analysis of the type of problem and the practical application of aspects there are significant limitations sex . The finite element method so that the physical characteristics of the plastic deformation process to get real inclusion, to comprehensively consider various boundary value , initial conditions, and for complex boundary with high fitting accuracy , thus becoming the metal forming process numerical Simulation of the mainstream approach . Over the past decade , with the rapid development of computer technology and increasingly sophisticated numerical methods , especially with welded flange technology continues to improve and develop , flange numerical simulation in plastic forming application has been booming , increasingly wide range of applications . hydraulic couplings From sheet metal forming the bulk metal forming , the forming simulation results from forward to backward simulation predictions for preform design , from taking into account the thermal deformation and thermal conduction to the right welded flange coupling analysis and defect microstructure prediction everywhere showing finite element simulation technology in the field of plastic processing important role and position. From plastic finite element numerical simulation technology development, the finite element method has been out of purely theoretical analysis and simulation for the exploratory phase , have been widely used in industrial production.
            In forging technology, the first rigid method axisymmetric closed die forging process of the digital simulation and experimental results are compared with , both relatively good. On the rigid law was further strengthened improvement proposed to deal with arbitrary shapes welded flange boundary conditions approach. Dimensional rigidity , simulation of the rectangular cross-section annular ring blank is forged into a circular cross section of the forging process . Mapping method based hexahedral meshing technology and based on the boundary conformation remeshing technique, forged steel bearing shaft without simplifying supernatural forging process was simulated calculations and experimental results is relatively good. Had been rotary forging process simulation , revealing the disc center cracking when rolling elements . Coupled thermo forming process analysis will consider the temperature distribution of the steel deformation problems , and considering plastic deformation work and the contact interface friction work simultaneously solving the problem of heat transfer , thus improving the accuracy of welded flange . Method for the first time using elastic deformation of steel bars with a thermal heat exchange coupling analysis . Etc. coupled thermal steady state flow calculation, analysis of rolling, extrusion, drawing and other forming process . Method using steel welded flange forging process simulation analysis , a rough calculation of non-uniform temperature field and forgings internal residual stress. On many occasions, such as a continuous forging process temperature distribution analysis of the situation , china hydraulic hose the more close to the actual simulation . With the gradual improvement of the forward simulation technology , reverse welded flange technology has been developing rapidly.