Method for defining curve surface features by user based on existing models

Abstract

The invention discloses a method for defining curve surface features by a user based on existing models, the geometric information of the existing models is utilized, a local curve surface area interested by the user is selected, and a new curve surface feature is automatically generated. The method comprises the steps as follows: in view of a large amount of existing curve surface models, selecting the local curve surface area with engineering semantics according to the user demand at first; then reconstructing a curve surface in the shape of the local area by obtaining related information based on feature lines in the local area and selecting a proper curve surface generation mode; and finally parameterizing the generated new curve surface. The method is mainly characterized in that the user is supported to automatically select the local area with the engineering semantics from the existing models, the characterization is achieved, and the redesign from a bottom layer each time is avoided; and the method is applied to the CAD (computer-aided design) model design and can promote the design reuse and the design transformation of a product, shorten the development cycle of the product and improve the design efficiency.

Description

technical field [0001] The invention belongs to the field of computer-aided design, in particular to user-defined features, curved surface feature representation and curved surface feature parameterization methods in feature technology. Background technique [0002] The research on feature technology is gradually shifting from simple features to complex features, and from regular features to surface features. However, surface feature technology is still in its infancy, and there are still many problems to be solved. In terms of user-defined features, free-form surface features have too many degrees of freedom, and it is difficult to customize the surface features required by users as conveniently as conventional features. Given that there are a large number of surface models, using the geometric information in the existing models to customize the features of these engineering-significant regions is the key to avoid repeated design of the same or similar local regions. [00...

AI Technical Summary

Problems solved by technology

At present, the existing user-defined feature methods are still in the definition of regular features and specific free-form surface features, but most of these methods are difficult to define general free-form surface features

In the process of customizing surface features, the establishment of geometric elements of surface features and their parametric representations are too cumbersome and complicated, and the establishment of mapping relationships is difficult and lacks generality

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