Finite Element Analysis And Parameter Optimization Of Hot - Pressed Die For Pile Leg In Offshore Oil Drilling Platform

The Jack-up platform is a kind of equipment which is used in the offshore oildevelopment and exploration most widely. Due to the limitation of working environment,strict is very important, however, The structural strength and the degree of precision aresafe performance of the whole mechanical structure effects. Offshore platform structuremore complex, and the amount of steel is more, caused the entire platform up to theweight of thousands of tons. These weight mainly through the leg to the bottom of the sea,the mechanical structure and strength characteristics of pile legs is the importantguarantee of offshore platform overall security. According to the statistics, platformaccident is largely due to leg yielding destruction. Based on the CJ70jack up leg framestructure design project drilling platform in the half chord pressing mold as the researchobject, using the NX8.0modeling two-dimensional model, the generated STL file andload it into the finite element analysis software DEFORM for analysis, to avoid a lot ofrepeated modification model the actual work, save time and the cost of toolingdevelopment.DEFORM is a large metal plastic forming, heat, mechanical coupling finite elementanalysis software, but as a general finite element software, DEFORM in professionalproblem specific solutions is deficient. Especially the lack of a library of materials in theDEFORM provides the material base that material model does not correspond toASTM-517this kind of steel. Material loading model is the foundation if to study thestress analysis of mould in DEFORM. When completion of the loading material modeland the generated files are stored in the database, then in the analysis of call to. Anotherapproach is to find material model in library material substitution, the method to analyzelow precision and the significance of small.This paper intends to adopt the European standard (EUROCODE3) method forlinear approximation of the stress-strain model, then broken line model. And loaded intothe DEFORM material library for numerical simulation. After the material loading model, grid division and after treatment, through comparative analysis to verify the feasibility ofthe method. Save cost and time for die design.Through the orthogonal experimental study is conducted for the effect of velocity,friction coefficient and the temperature on the die stress, established the mathematicalmodel for forming load as objective optimization problem. The above three factors asoptimization variables and find a set of optimal parameters to optimize the combinationof based on least squares method. The optimized X load reduced from2500N to2400.23N, Y to load reduced from2724N to2500N, drop respectively3.99%and8.22%shows that the improvement on the existing process, provide guidance for the subsequentdevelopment of mold design.