Research On The Division Method Of Sub-module For Car’s Cover Mold

As an important part of the automobile in the automotive industry, the covering panel has aprofound influence on the forming accuracy of superior quality car in China, but themanufacturing capacity of the large precision panel in high-end car is insufficient, the largeprecision panel need to import. The dynamic matching ratio of the convex and concave dies isthe premise for the panel’s proper forming, so it is of great significance to improve the ratio. Inthe practical manufacture of dies, the ratio is improved by grinding by hand to meet therequirement, and it takes almost half of the entire cycle. If the experiment explores the affectingfactors of dynamic matching precision by the large covering panel, it will inevitably increase thedifficulty and the cost in test. Therefore, this paper based on the idea that from local to global,proposes the construction of the sub-model system on large dies. The car`s roof reinforcementpanel as an example in this paper.1) Through Dynaform to establish finite element model and carry on deformation analysisof blank, getting XY displacement change data on all nodes. From XY displacement counterknown the smallest change place of blank in the XY directions locate on the right and left cheeks(the lower left and lower right of the panel), the variation of XY displacement is only0.04%. Wecan think the border area that didn’t move within the error scope of0.04%.2) A whole die`s model is established and simplified. It will generate the K file, after themodel meshed in the grid software Hypermesh. The overall covering panel are numericallysimulated through the finite element analysis software ANASYS/ls-dyna. The simulation resultsshow that the covering panel the maximize contact pressure located on the right and left cheeksborder. According to the result of the analysis, XY displacement change is small and the contactpressure is very big in those, those can be regarded as the sub-model.3) All nodes displacement change data of the finite element model are programmed inJAVA, then using those has been obtained boundary nodes fit boundary curve. ThroughANASYS/ls-dyna a sub-model has been established for numerical simulation. The simulationresults show that the sub-model tend to be more reasonable, can reach the purpose to test insteadof whole model, decrease the difficulty and the cost of the test. The method of this paper hascertain actual application value.