The selection of MF grid size in precision injection molds, the simulation analysis of the early stage of the product plays an important role in guiding mold design, and the division of the grid plays a decisive role.
When dividing the grid, the grid size determines the accuracy of the simulation results and the simulation time.
Generally speaking, the number of two-level grids should be controlled within 80 thousand, and the number of 3D grids should be controlled within 1 million, and the number of grids should be reduced as much as possible under the conditions of ensuring product division and analysis accuracy.
As shown in the figure, the size of the part is 8 mm × 2 mm × and the thickness is. When the grid size is larger, the CPU time used in the simulation is shorter. When the grid size is from 0.
When 5 mm increases to 1mm, the CPU time drops from 450 to 50, and when it increases from 1 mm to 6mm, the CPU time changes little;
However, when the grid sizes are 5 mm and 6mm, the pressure at the filling end decreases obviously, and the accuracy of simulation calculation decreases.
Therefore, in order to improve the accuracy of simulation, it is not necessary to blindly reduce the grid size, nor can it blindly increase the grid size in order to improve the simulation efficiency.
Generally speaking, the mesh size is 1 ~ of the thickness of the product ~ At 2 times, it can not only ensure the accuracy of simulation, but also take into account the simulation efficiency. NJPE-
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