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Rapid precise constructing and shaping method for complex curved face product

A technology of complex surfaces and forming methods, applied in 3D modeling, image data processing, special data processing applications, etc., can solve the problem that the surface mesh is not closed, the time to construct the mesh surface is long, and the mesh surface cannot be truly reflected, etc. problems, to achieve the effect of ensuring consistency, avoiding self-intersection and inclusion, and saving judgment time

Inactive Publication Date: 2007-08-29
SHANDONG UNIV OF TECH
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Problems solved by technology

[0003] The disadvantages of the above method are: the surface mesh constructed by the split surface product is not closed, and the processing path cannot be generated after layered processing, and there are problems such as long time for constructing the mesh surface, and the mesh surface cannot truly reflect the product shape, There are problems such as thin elements and redundant elements

Method used

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  • Rapid precise constructing and shaping method for complex curved face product
  • Rapid precise constructing and shaping method for complex curved face product
  • Rapid precise constructing and shaping method for complex curved face product

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Embodiment 1: Curved surface construction and rapid prototyping are carried out to the human head model, and its experimental steps are:

[0026] 1. Obtain the surface data of the human head model with a laser measuring machine, the number of data points is 40146, and use R * -tree is used as an index structure to establish the topological adjacency relationship of scattered points, and uses the pruning strategy to calculate the K nearest neighbors of each data point. Since the data points retained after collection in places with complex characteristics such as eyes, ears and noses are relatively dense, and in The data points retained in other parts are relatively sparse, so K=20;

[0027] 2. Among the 40146 measured data, select the data point with the largest Z coordinate and find the two points closest to it in space, then connect these three points into a triangle, adjust the arrangement order of the vertices of the triangle so that the normal vector points to Cons...

Embodiment 2

[0032] Embodiment 2: Carry out curved surface construction and rapid prototyping to the Venus head model, its experimental procedure is the same as embodiment 1, just in step 1, obtain the 19928 surface data points of the Venus head model with a laser measuring machine, the number of neighbor points to find is 10; in step 4, the offset thickness of the mesh model is 3mm, and the lighting rendering effect of the generated triangular mesh model is shown in Figure 6, the number of patches is 39473, and the time-consuming is 14s.

Embodiment 3

[0033] Embodiment 3: Carry out curved surface construction and rapid prototyping to the rabbit model. The experimental procedure is the same as that of Embodiment 1, except that in step 1, 34,833 surface data points of the rabbit head model are obtained with a laser measuring machine, and the number of neighbor points to be found is 12. In step 4, the offset thickness of the mesh model is 3mm, and the lighting rendering effect of the generated triangular mesh model is shown in Figure 7, the number of patches is 134456, and the time-consuming is 15s.

[0034] The rapid and accurate construction and molding methods of other complex curved surface products are the same as above.

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Abstract

This invention provides a fast and accurate building and molding method for complex surface products, which is characterized with the steps: (1) collecting data and pre-treating them, (2) creating the initial wave pre-ring, (3) defining saturation point, freedom point, wave-front side, wave-front point , wave-front wings and side angle, to generate grid model of the initial measurement data, (4) calculating arrows of all the node and the offset data coordinates values along arrows to generate the triangular grid unit of data points in offset layer, (5) suturing the boundary of original layer and offset layer, ( 6) outputting STL file, producing the prototype.

Description

Technical field [0001] The invention provides a fast and accurate construction and molding method for products with complex curved surfaces, belonging to the technical field of rapid prototyping. Background technique [0002] In the surface construction and rapid prototyping of products, there are usually two methods for constructing curved surfaces: one method is the central axis method, which is a two-dimensional division method realized by projecting spatial measurement data points onto a plane, and delineating a Area, the boundary of the area is composed of the vertical line connecting the node and the adjacent node, connecting the nodes in the two adjacent areas can form a triangular mesh surface; another method is to use the local incremental method, in On the boundary of the generated mesh surface, expand the mesh surface outward according to the same law, which is specifically disclosed in US Patent No. 6,968,299 to Bernardini et al. Starting from a seed cell, let a ...

Claims

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Application Information

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IPC IPC(8): G06T17/00G06F17/50B29C67/00
Inventor 孙殿柱孙肖霞李延瑞
Owner SHANDONG UNIV OF TECH
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