3D printing self-adaptive layering method based on step slope height and volume error

Abstract

The invention discloses a 3D printing self-adaptive layering method based on step slope height and volume error. The method specifically comprises the steps that firstly, the minimum height difference delta hmin and the maximum height difference delta hmax of a current layer are solved; according to the minimum printing thickness delta Hmin, the maximum printing thickness delta Hmax, delta hmin and delta hmax, the printing thickness delta hi of the current layer is selected, the maximum volume error delta vmax generated when the delta hi is used as the printing thickness for printing is calculated, the relation between the delta vmax and the allowable volume error is compared, and the relation between the maximum step slope height cmax and the allowable step slope height is judged; and the layer thickness is segmented, the model is segmented according to the layering surface with delta hi as the printing layer thickness, the model contour is extracted, and the part is printed. The printing thickness is adjusted in real time according to the height difference of triangular patches in the direction in combination with the volume error and the step slope height, so that the printing efficiency and precision of parts are improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a 3D printing adaptive layering method based on step slope height and volume error. Background technique [0002] 3D printing is based on the part model and uses layer-by-layer accumulation to complete the processing of parts. When using 3D printing to process parts, it does not need to consider its complexity, nor does it need to design and manufacture special molds or tools for processing. Therefore, 3D printing has been widely used in various industries, especially suitable for single-piece production. [0003] 3D printing is to complete the modeling of the model by layer-by-layer accumulation, so the model of the printed part needs to be processed layer by layer. The key to 3D printing is to increase the printing speed while ensuring the printing accuracy of the parts. Printing speed and printing accuracy are mutually restricted. Therefore, how to automatica...

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Problems solved by technology

[0004] At present, among the commonly used adaptive layering algorithms, the layering basis of the adaptive layering algorithm based on the slope height of the step is one-sided, which cannot fully reflect the surface characteristics of the model; the adaptive layering algorithm based on the curvature of the model surface is suitable for the parameterized When the surface of the model is complex, this method cannot be used; the adaptive layering algorithm based on the area change rate of adjacent layered layers is prone to misjudgment due to sudden changes in the model structure; the contour reference line obtained based on vertical segmentation The self-adaptive layering algorithm has strong adaptability to some rotating bodies, but it cannot guarantee the printing accuracy of complex models with irregular surfaces

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