Optimization design method of fast precision casting resin prototype inner cavity sizes

Abstract

The invention discloses an optimization design method of fast precision casting resin prototype inner cavity sizes. The method is used for solving the technical problem that the size precision of a shell designed with an existing optimization design method of precision casting resin prototype inner cavity sizes is bad. According to the technical scheme, a geometric model, a finite element model and a size optimization model are established, and size optimization iteration is performed. According to the optimization result of the resin prototype inner cavity sizes, a CAD model is reconstructed to form an inner cavity configuration, and then a resin prototype is directly manufactured with a photo-curing fast forming machine. According to the method, on the basis of an existing single-cell filling style, size optimization is performed on the sizes of a structure forming single cells according to the different models, and therefore the shell stress of the model can be smallest. With the size optimization method, different inner cavity configurations are designed according to different prototype structures. The single-cell configuration type in the existing software can further be utilized to perform processing. Meanwhile, the rigidity of the resin model is considered, the best matching of the stress and the rigidity is achieved, and the accuracy of the sizes of the shell is improved.

Description

technical field [0001] The invention relates to a method for optimizing the inner cavity size of a rapid precision casting resin prototype. Background technique [0002] The precision rapid casting technology based on resin-based rapid prototyping does not require molds and tooling in the manufacturing process, which greatly reduces the cost and cycle of single-piece manufacturing, and the obtained castings have high dimensional accuracy and low surface roughness. It has significant advantages in the manufacture of complex parts in aviation, aerospace, automotive and other fields. Rapid casting technology also has problems such as high resin cost and difficult ablation. Among them, the problem of mold shell cracking caused by thermal expansion of resin needs to be solved urgently. [0003] refer to figure 1 . Document 1 "Hague, R., D'Costa, G. and Dickens, P.M. (2001), Structural design and resin drainage characteristics of QuickCast2.0, Rapid Prototyping Journal, Vol.7No...

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Problems solved by technology

[0006] In order to overcome the disadvantages of the poor accuracy of the mold shell size designed by the existing optimal design method for the inner cavity size of the precision casting resin prototype, the present invention provides a method for quickly optimizing the inner cavity size of the precision casting resin prototype

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