A kind of photocuring three-dimensional printing method

Abstract

The invention belongs to the technical field of three-dimensional printing. In order to solve the problem that it is difficult to realize continuous light curing and printing in the prior art, the invention discloses a light-curing three-dimensional printing method, which includes the following steps: dividing the curing model to be printed into n layers; Divide the layer pattern of each layer into m image groups; each image group is composed of discrete graphics elements; during the printing process, the m image groups are irradiated with light beams one by one. , a channel of photosensitive material is formed on one or several groups of pictures that have not been irradiated, and the channel is in contact with the edge of each picture element of the i-th picture group being irradiated, so that the photosensitive material flows back to the i-th picture group through the channel The photosensitive material irradiated by the light beam forms a cured layer; sequentially prints n layers of layer patterns to form n layers of cured layers, and accumulates to form the cured model. The invention improves the printing speed and the strength of the cured model, and can also realize continuous light curing printing.

Description

technical field [0001] The invention relates to the technical field of photocuring three-dimensional printing, in particular to a photocuring three-dimensional printing method. Background technique [0002] Stereo-curing three-dimensional (3D) printing technology is based on digital three-dimensional model files, and constructs printed objects (cured models) by layer-by-layer printing. Most of them include a light source (such as an ultraviolet light source) and a molding platform combined with a curing model. The molding platform can move during the printing process through a driving mechanism (such as a screw driving mechanism). The light source emits a beam of light to selectively irradiate the photosensitive resin to form a cured layer. A three-dimensional solidification model is formed. [0003] For the photocuring printing process of the free liquid surface, after the selective light curing is completed for one layer, it is often necessary for the model to sink to the...

AI Technical Summary

Problems solved by technology

Even if the photosensitive resin has a strong self-leveling ability, it still takes a long time for the photosensitive resin to reflow, and it is difficult to achieve a continuous photocuring process, and the printing speed needs to be improved

In the photocuring 3D printing process of constrained liquid surface, the light beam passes through the release film to selectively irradiate the photosensitive resin for layer-by-layer curing. During the printing process, the cured layer will adhere to the release film. Carry out the release process to realize the reflow of photosensitive resin, the reflow speed is slow, which affects the printing speed. For the method of using oxygen and other inhibitors to form a curing dead zone in the photosensitive resin in the area close to the release film to avoid the adhesion of the cured layer and the release film However, special release film and corresponding materials and printer structure restrictions are often required, which affects the application range, and the reflow speed of photosensitive resin for thicker models is still slow, and it is difficult to achieve continuous light curing printing, and the printing speed needs to be improved.

Moreover, in these methods, the solidified layer and the layer are planarly bonded, and the bonding strength is often the bonding strength between the materials in the layer, and the overall strength of the cured model needs to be improved.

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