New 3D Grid Technology Significantly Reduces Pre-Processing Time for Plastic Parts Filling
HC Plastics News: The generation of 3D flow channel grid technology provides more methods and possibilities for plastic filling simulation. A new generation of 3D mesh technology will significantly reduce the pre-analog processing time.
In the past, in the development of plastic filling simulation technology, more emphasis was placed on the filling process of the product itself. In the analysis of the flow path, the 1D line structure and the simplified numerical assumption are often used to obtain the flow rate and pressure values ​​of the melt rubber entering the product from the end of the flow passage in the cavity, as an inlet condition for simulating the filling of the plastic parts.
Later, as the simulation of the flow channel gradually gained attention, the 3D flow channel mesh technology was introduced, and the filling simulation was advanced to the beginning of the flow channel to simulate the various flow behaviors of the melt in the flow channel to the temperature change, and then analyze Such as temperature imbalance caused by shear heat generation and multi-cavity filling imbalance.
To properly simulate the behavior of the melt inside the runner, the quality of the 3D runner grid is critical. In the past, in Moldex3DMesh, users can match the section mesh with 1D curve, and then use the solid mesh generation tool such as sweep to create a 3D flow channel mesh semi-automatically.
For simpler flow path design, the flow path wizard function in Moldex3DDesigner can be used to automatically generate 3D flow channel mesh with line structure and flow path diameter parameters. These tools and techniques have become an integral part of the mold flow analysis software, and the 3D flow channel grid created has a critical impact on the simulation results.
However, with the continuous improvement of the mold industry technology, the flow channel design is more and more diversified and the complexity is getting higher and higher. When users want to build a large and complex 3D flow channel grid, the time cost involved becomes quite large, so we must try to improve this situation.
In order to help users save a lot of time and get a 3D flow channel mesh suitable for mold flow analysis, Moldex3D developed a new generation of automated high quality flow channel mesh construction technology in R15.0. It includes a Hexa-based solid mesh, a variety of node forms (Nodetypes), and a real-time node preview (NodePreview).
New hexahedron model of grid curve
The advantage of the hexahedral flow channel grid is that it can use a small amount of elements to obtain the required number of layers, which not only has high resolution, but also saves a lot of analysis time and can also improve the grid quality.
Defining a variety of flow channel node types at the intersection of the flow channel curves, automatically determines the available flow channel node form for the user to select according to the number, angle and flow path form of the connected curve.
Real-time preview of the channel node (RealTimeNodePreview) As mentioned above, the new generation of channel grid technology can preview the channel node in real time when setting the channel node form, without waiting for the grid to be generated, the node can be seen. shape. In addition, the flow channel mesh is generated according to the set node shape, and no deformation occurs. For common runner nodes, a Hexa-based grid is produced; for complex runner nodes, a BLM grid is generated.
From the results of the mold flow analysis, it can be seen that the new generation of flow channel mesh uses a hexahedral mesh, which has less elemental quantity than the original flow channel mesh, but has better mesh quality and analysis results.
Through the Moldex3DR15.0 high-speed, high-quality runner mesh technology, high-resolution hexahedral meshes can be automatically generated in the shortest time, and the original geometry of the runner can be closer to the high-precision analysis. It meets the user's high complexity of runner design requirements, and also greatly saves the time and cost of manually engraving the grid.
Article link: China Plastic Online http://info.21cp.com/industry/News/201710/1343123.htm 
Editor in charge: Wang Ning 12
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