Application of artificial intelligence and feature technology in forming and analysis of caps and parts The feature of car cover forming features is characterized by geometric features, and process features and material features are secondary features. The introduction of feature technology in the process design of search molds for forming parts is to increase the degree of automation of the part process design. Different process features in search parts are different in the deformation process.

For example, during the Deep Drawing process of the box parts, the deformation of the material at the straight edge (straight-edge type bending) is dominated by the elongation-like deformation, and it can be treated as a curved process. The deformation of the material at the rounded corners (concave-angle bending) is dominated by compression-type deformation, and is generally handled by a cylindrical barrel drawing process. In the intersection of two process features, because the material deformation process involves a number of nonlinear factors, it is difficult to perform constant t-analysis, so accurate process analysis cannot be performed, and the relevant process parameters are often determined by experience.

Feature-based process analysis still needs to be based on the existing relevant theories, process design knowledge, and solid foundation. Different process features require different process parameters in the forming process, for example, when large-size parts are deepened. The material at the straight edge is easy to flow. In order to prevent wrinkling, draw ribs or draw lintels are generally set to increase resistance.

The material at the corners has a large flow resistance due to the limitation of the geometric shape. Usually, it is not necessary to provide a ribbed rib or the like. At present, in the feature-based search process of the lid-covering process, characteristic process schemes such as cylinder drawing, curved surface forming, bending forming, drawbead control forming, and blank holder force control are usually set. The forming characteristics of the model to be analyzed are analyzed, and then the process feasibility analysis is performed on each analyzed part.

Finally, the analysis result of each process feature is illustrated and illustrated based on the examples in the feature process library. It can be seen that this process analysis system is not only an expert system but an intelligent system, which can automatically or semi-automatically confirm and optimize the process plan. The lid shape design usually adopts the method of "precursor surface and then thicken into solid body". In the finite element system of forming analysis, the medium surface is often used instead of the physical model to divide and analyze the grid. Therefore, in the analysis, the characteristics of the medium side are often stored in the process characteristics intelligent system. If the body model is needed, the operations of “thickening” or “biasing” can be implemented.

Analysis Example The analysis example used in this paper is the door frame inner panel of a light vehicle. Due to the large depth of formation, cracking often occurs in actual production. In order to put forward a reasonable process improvement plan, this paper adopts the above-mentioned idea of ​​reverse analysis, carries out the design of process parts according to the process flow, and then carries out process analysis and optimization.

The specific model is as shown. The material parameters used in the analysis are as shown. Material Parameters Yield Strength Tensile Strength Anisotropy Index Hardening Index Sheet Thickness Friction Coefficient 205. Analytical Models The resulting forming limit diagrams using the model are shown. From the figure, it is not difficult to find where there are multiple cracks in the rough area.

In order to avoid this kind of defect, this article carries on the technological characteristic analysis to the model, then calls the existing Case to carry on the comparison, plans to use the following two kinds of schemes to carry on the improvement: Forming the limit (1) Increases the craft notch in the shaping to a certain degree, Such as the analysis results. (2) While adding the process gap, the initial blank is also modified to use the blank shape.

After the above analysis and on-site debugging, it was finally found that the possibility of a rupture after the adoption of the (2)th option and the area was significantly reduced, and the program was eventually adopted. The forming limit diagram after adding the process notch opens up the process notch and the forming limit after the blank is modified.

Conclusion Practice has proved that the feature-based process design system is applied to the design of the cover mold and the analysis of the process plan. This not only improves the degree of automation of the process design, but also helps to digest and absorb foreign advanced mold manufacturing and design faster. Technology, in order to speed up the development of China's own development and manufacture of large-scale car cover mold die-cast foundation.

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