A 3D model nesting placement method based on model similarity

Abstract

The invention discloses a method for nesting and arranging 3D models based on model similarity, which comprises the following steps: step 1: voxelize the surface of the 3D model; step 2: voxelize the 3D model according to the similarity Combination classification, divided into similar model group and non-similar model; Step 3: Nest and arrange similar model group and non-similar model according to the order of yzx axis to get the placement area; Step 4: In the placement area, similar The model group and non-similar models are placed iteratively and nested in the order of the yxz axis, and the area is updated after each iteration until the iteration is completed. Firstly, according to the voxelized 3D model, make similar classification and combination of 3D models, then nest and place them in the yzx direction to get a placement area, and finally nest and place them in the yxz direction, iteratively adjust the xy direction size so that each The area of ​​the second placement is the smallest. Through the combination of similarities, the support material between the models is reduced, and the models are easy to remove after printing.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a method for nesting and arranging 3D models based on model similarity. Background technique [0002] In 3D printers, especially in DLP and MJP type 3D printers, in order to improve printing efficiency, it is often necessary to place as many 3D models as possible in the printing platform at one time in actual production. In 3D printing, model nesting is more complicated than the traditional 3D box packing problem. The traditional box packing problem is to place as many objects as possible in a fixed container. In 3D printing, the box packing problem is not only to consider the space occupied by multiple models as small as possible, but also to consider the characteristics of 3D printing. In DLP and MJP printing, the printing time of the model is determined by the maximum printing height, so the height is fixed when nested, and the smaller the area occupied in the...

AI Technical Summary

Problems solved by technology

In 3D printing, model nesting is more complicated than the traditional 3D box packing problem

[0003] At present, in actual production, there are only two-dimensional nested placement algorithms for 3D models, and most of them are sampling manual placement methods. This is very dependent on manual experience and takes a long time.

Now there are some software that can provide a certain function of automatic 3D nesting, but most of them are only 3D nesting in the xy plane, there is no automatic nesting in the z direction, and the printing support and the size of the area are not considered. not effectively

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