Softname:

Update link

   CORETECH.MOLDEX3D.R9.0

Size:

  Windows

The new simulation capability of variotherm processes, as an example, models cycling the mold temperature from hot to cold over the course of a molding cycle. Unlike the traditional approach of maintaining constant mold temperature, variotherm processes simulate the results of deliberately using higher mold temperature during filling and packing and then dropping the temperature for the remainder of cycle. Now Moldex3D R9.0 develops new 3D technology to support the simulation of this advanced process to further help users to solve and optimize the application of variotherm process.

The imbalance structure phenomenon of plastic injection molded part is always difficult to be handled. Even though the design of runner and part structure is already balanced, structural defects or stress concentrations might occur at unexpected regions. Previous researchers already revealed that this problem is related to the temperature variation and shear rate distribution of melt flow, and accordingly proposed a novel apparatus to solve it. However, the design parameter of the novel apparatus is hard to be identified due to the elusive variation of temperature and shear rate in whole molding process. In this paper, we will investigate the source and solution of imbalance structure phenomenon using both of Moldex3D injection molding analysis tool and ABAQUS.

Besides, to meet the specific needs for a wide array of injection simulations, Moldex3D is proud to provide the multi-functional pre-process mesh known as “Moldex3D-Mesh”. The advanced functions of Moldex3D-Mesh allow the users to create/export/fix/edit mesh models effectively, determine the runner layout and cooling system and prepare different meshes required for various types of analysis in advance. As the complicated model shown in Fig.9, Moldex3D-Mesh allows the users to mesh the model efficiently and quickly.

2. Structure imbalance problem
The main source of structure imbalance problem is the unbalanced flow behavior in injection molding process. Because of the complex molding process phenomenon, even a symmetric multi-cavity runner system, there might be asymmetric residual stress and fiber orientation due to the unbalanced melt flow. Generally, this imbalanced flow comes from asymmetric temperature and shear stress distribution in runner system. Besides, the material characteristic and residual stress of plastic part is extremely dependent on whole molding process. Especially for residual stress, it will cause the unpredictable warpage after demolding to confound the overall success of injection molding process. Therefore, the imbalance flow is the major source to lead the structure inherent problem of final product.
Through Moldex3D injection molding analysis technology, we can easily investigate the tiny variation in whole molding process, such as temperature and stress variation. Therefore, we analyses the filling melt temperature in a two-cavity model with geometry symmetric runner system to understand the source of imbalance structure. Figure 2 shows the melt flow prediction on a framework model. This figure clearly describes the phenomenon of imbalanced flow in a symmetric runner system. Furthermore, Figure 3 shows the asymmetric residual stress distribution after injection molding process. Therefore, the residual stress is the main factor of structure imbalance in this case
Residual stress is one of critical problem on product quality, which affects the mechanical anisotropy, thermal and optical properties, and the long-term dimensional stability. However, this important problem is strongly related to the viscoelasticity property of plastic material which is difficult to be preciously measured and predicted by traditional technology. Moldex3D R9.0’s brand new Viscoelasticity technology provides users a good analysis tool to effectively predict the residual stress and prevent the potential design problem.

                                                     http://www.caxsoft.net/               http://softworld.tux.nu  
                                         E- Mail : crkteam@gmail.com cc: cax_world@gmx.net        
  
                                | Home | Search | FAQ |EDA | CAD/CAM/CAE| Elite Software|FeedBack |