Heterogeneous NURBS (Non-Uniform Rational B-Splines) volume parameterization model slicing algorithm applied to rapidprototyping

Abstract

The invention relates to a heterogeneous NURBS (Non-Uniform Rational B-Splines) volume parameterization model slicing algorithm applied to rapidprototyping. The slicing algorithm comprises the following steps: expressing a geometric model and a material model of a heterogeneous entity in a manner of a NURBS volume model, combining the geometric model with the material model, and simultaneously expressing geometric information and material component information of the entity; dividing the combined NURBS volume model into grids according to isoparametric lines; carrying out plane slicing on the NURBS volume model, generating a layered section applied to rapid prototyping, obtaining a model section with material distribution information and finally slicing the heterogeneous NURBS volume parameterization model. Through the heterogeneous NURBS volume parameterization model slicing algorithm, the material component information is additionally arranged on an entity control point, so that the continuous expression of the model material information is achieved; the section information including the material component information of the heterogeneousentity model can be effectively obtained; the technology support is supplied to rapid prototyping of heterogeneous products based on the NURBS volume model; and a method for manufacturing the heterogeneous products is also developed.

Description

technical field [0001] The invention relates to a rapid prototyping technology, in particular to a non-homogeneous NURBS body parameterized model slicing algorithm for rapid prototyping. Background technique [0002] Rapid prototyping (RP) is a high-tech manufacturing technology based on material accumulation method, which is considered to be a major achievement in the manufacturing field in the past 20 years. It integrates mechanical engineering, CAD, reverse engineering technology, layered manufacturing technology, numerical control technology, material science, and laser technology, and can automatically, directly, quickly and accurately transform design ideas into prototypes with certain functions or directly manufacture parts , so as to provide a high-efficiency and low-cost realization means for parts prototype production and verification of new design ideas. That is, rapid prototyping technology is to use the data of three-dimensional CAD to accumulate layers of mate...

AI Technical Summary

Problems solved by technology

[0005] In the existing rapid prototyping technology, STL files are often used to express 3D models. STL files use triangular patches to represent the surface information of the model, which is a simple and effective model expression method that takes up little space. This method has the following disadvantages: 1. It is an approximate geometric representation method, which cannot accurately represent the geometric information of the model; 2. It can only represent the surface information of the model, but cannot represent the internal information of the model, such as internal material information

Taking heterogeneous materials as an example, NURBS volumes can represent material information at any point inside the model, which cannot be satisfied by other model formats commonly used for rapid prototyping.

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