Third, the construction of product design pattern based on 3D CAD software The traditional design process is based on the 2D CAD environment, the design process is relatively extensive, generally divided into three stages of "functional design, conceptual design, detailed design", as for each stage The definition of the work involved and the work involved, the experts have given different definitions from different angles, there is no uniform agreement. Since the application of 3D CAD software is limited by computer hardware, the design idea based on 3D CAD software is very different from the design idea based on 2D CAD software. If you use 3D CAD software according to 2D thinking mode and design flow, not only Can not reflect the advantages, but may show many disadvantages. To fully exploit the advantages of 3D CAD software, a new design flow and design pattern must be explored.
1. Product Design Pattern In the conceptual design phase, you should use SolidWorks layout sketches. First, create a master assembly drawing file, draw one or more sketches in the assembly file, sketch the position of each component, and define the parts with "blocks". The size and shape of the drag part checks the motion relationship between the components. The layout sketches formed during the conceptual design phase are the basis for program discussion and team collaborative design. The biggest benefit of using an layout sketch to design an assembly is that if you change the layout sketch, the assembly and its parts are automatically updated. You can quickly make changes quickly by changing one place.
The general assembly generally uses a bottom-up design approach. Limited to the speed of current computers, top-down design of large assemblies is not realistic. The design strategy for the total assembly is based on the layout sketch completed during the conceptual design phase, inserting the sub-assembly.
Subassemblies should be chosen reasonably. A top-down design approach is recommended for new design recommendations to enable correlation design. If you need to reference existing parts or standard parts, you should use two methods together. First, create a layout sketch, insert modular parts and parts based on the layout sketch, and determine the shape of the newly designed part in the assembly environment. , size and position in the assembly. The advantage of the top-down design approach is that when a design changes, the associated part is automatically updated based on the creation method.
For factory standard parts and general parts, it is best to design in part mode instead of top-down design in the assembly environment to maintain the versatility of the parts.
2. Collaborative work of design and analysis COSMOSWorks is a plug-in for SolidWorks software. It shares a unified database with SolidWorks. The product model data is completely consistent and the operation interface is unified. It is a fully functional structural analysis software. Structural analysis using COSMOSWorks has the following three distinct advantages.
After the CAD model is modified, the analysis process (including meshing, load definition, boundary conditions, etc.) does not need to be redefined. Just run the “Analyze†command, and the program will re-analyze the modified product model, which is convenient and quick. .
When comparing multiple products for product analysis, you can establish a configuration for each solution in the CAD environment. In the analysis environment, you only need to define the analysis process for one configuration. When analyzing other configurations, you only need to perform one drag. , pull operation, copy the defined analysis process to the new configuration. It is very convenient to implement a comparative design of multiple schemes.
When product size optimization is designed in COSMOSWorks, SolidWorks establishes a corresponding configuration for each set of size combinations. When the user selects the optimal value of the optimization result or a certain combination of sizes, no remodeling is required, just in SolidWorks. Select the corresponding configuration and you get the product model you need.
The unification of the design model and the analytical model will greatly improve the efficiency of the finite element analysis. The unification of the design model and the analysis model can be achieved by the following three methods.
Train all designers on the knowledge of finite element analysis to understand the difference between the finite element analysis model and the detailed product model. The designer is required to consider the finite element analysis requirements in the product design and establish an analysis configuration for the parts to be analyzed. - Structure configuration.
Starting from the product design process, a structural design phase is established to enhance the designer's understanding of the analysis. Only approved models enter detailed design and drawing, which can reduce many ineffective labor.
When it is necessary to pass the CAD model to the analysis software, the solid element is recommended to be modeled using SolidWorks' multi-entity technology, so that different mesh sizes can be easily set for different features in the analysis software. The shell element is preferably modeled using SolidWorks' surface modeling technology, which better guarantees the unity of the shell unit and the product model.
IV. Application Effect After using SolidWorks software, the product development level of Xiangtan Electric Group Co., Ltd. jumped to a new level. Mainly in three aspects:
Achieve error-free design, SolidWorks parts lightening and configuration design solves the most critical large assembly problems in 3D applications, realizes virtual design of complex products, and basically eliminates low-level errors in product design through interference checking, customer feedback It is getting better and better.
Improve design efficiency, SolidWorks configuration design meets the needs of serial design and customized design, with the use of feature library, parts library, component library, improve the reusability of design. Team collaboration was achieved through layout sketches and derived designs, and teamwork was closer.
Improve the design quality, COSMOSWorks is easy to learn and use, in the design process, it is convenient to carry out comparative design of multiple schemes, get rid of the traditional experience design and analog design, and realize the optimization design based on analysis.
Informatization construction is a historical process that accompanies the growth of enterprises. In the "master plan", it is necessary to clarify the key points of each stage, step by step, in order to develop healthily.
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