Analysis of the role of auxiliary mold for vehicle cover based on efficacy

The application of artificial intelligence and feature technology in the analysis of the forming of the cover part of the automobile cover is made of geometric features as the main feature, and process features and material features as the auxiliary features. The introduction of feature technology in the process design of the forming mold for the search cover is to improve the automation degree of the process design of the part. Different process features in the search cover parts are deformed in different ways during the forming process.

For example, in the deep drawing process of the square box, the deformation of the material at the straight edge (straight edge type bending) is mainly elongation type deformation, which can be treated as a curved process. The material deformation at the rounded corners (concave-angle bending) is mainly compression-type deformation, which is generally handled by the ring drawing process. In the area where the two process features meet, because the material deformation process involves multiple non-linear factors, it is difficult to determine the 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 foundations. Different process features require different process parameters during the forming process, for example, when drawing large-size parts , The material at the straight edge is easy to flow. In order to prevent wrinkling, a drawbead or a draw threshold is generally provided to increase the resistance.

The material at the rounded corners is limited by geometric shape, and the flow resistance is relatively large. Usually, it is not necessary to set up drawbeads. At present, in the feature-based process analysis system for search cover parts, there are usually set up feature process schemes such as cylinder drawing, curved surface forming, bending forming, drawbead controlled forming, and controllable blank holder force, etc., in the analysis, it is often based on these schemes. Analyze the forming characteristics of the model to be analyzed, and then analyze the process feasibility of each analyzed part.

After 　　*, the analysis results of each process feature will be explained and exemplified according to 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 realize the confirmation and optimization of the process plan. The modeling of cover parts usually adopts the method of “first surface, then thickening to become a solid”. In the finite element system of forming analysis, the middle surface is often used to replace the solid model for mesh division and analysis calculation. Therefore, in the analysis, the characteristics of the midplane are often stored in the process feature intelligent system. If the volume model is required, the operation of “thickening” or “offset” can be used to implement it.

Analysis example The analysis example used in this article is the door frame inner panel of a light-duty vehicle. Due to the large forming depth, cracking often occurs in actual production. In order to put forward a reasonable process improvement plan, this article adopts the above-mentioned reverse analysis idea, carries out the design of the process parts according to the process flow, and then conducts 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. The analysis model uses the model to calculate the forming limit diagram as shown. From the figure, it is not difficult to find that the blank has multiple cracks in the area with a large amount of drawing.

In order to avoid such defects, this paper analyzes the process characteristics of the model, and then calls the existing Case for comparison. The following two schemes are proposed to be improved: forming limit (1) When forming to a certain extent, open the process gap, Such as the analysis results. (2) While opening the process gap, the initial blank is also modified to adopt the blank shape.

After the above analysis and on-site debugging, it was discovered that the possibility and area of ​​rupture after the adoption of the (2) scheme was significantly reduced, and the scheme was finally adopted for this reason. The forming limit diagram after the process gap is added adds the process gap and the modified forming limit of the blank.

Conclusion Practice has proved that the application of the feature-based process design system to the analysis of the panel mold design and process plan not only improves the automation of process design, but also helps to digest and absorb foreign advanced mold manufacturing and design more quickly Technology, in order to speed up China’s independent development and manufacturing of large-scale automobile quilt cover molds has a fixed foundation.

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