Method for correcting projection distortion of photo-curing 3D printer
A 3D printer and light curing technology, applied in the field of 3D printing, can solve the problems of deformed projection pattern, unsatisfactory, final result of deformation, etc., to achieve the effect of overcoming deformity
Active Publication Date: 2018-04-20
BOOMING TECH LTD
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Problems solved by technology
However, in practical applications, due to the error of the projector itself and the error of equipment installation, it is difficult to keep the projection optical axis perpendicular to the forming table, that is, the image plane, and the projection pattern is prone to distortion and deformation, resulting in irregular surface exposure molding results. The deformation of the final result is unsatisfactory
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[0024] This embodiment provides a method for correcting projection distortion of a photocuring 3D printer, the flow chart of the method is as follows figure 1 As shown, first, an original model is printed out by using a light-curing 3D printer based on DLP technology, such as figure 2 As shown; then use precision instruments to measure the size data in the original model, the size data includes the vertical distance and horizontal distance of the four corner points of the original model relative to the center of the model; as image 3 As shown, R1, R2, R3, and R4 are the four corner points of the original model, because the square in the middle is found to have the smallest deformation in the observation of the actual printing results, and it can be used as a reference point to accurately calculate each The coordinate value of the corner point. Take the corner point R1 as an example: R1.x=TH1-(TM1 / 2), R1.y=LH1-(LM1 / 2), the coordinate values of R2, R3 and R4 relative to the...
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The invention discloses a method for correcting projection distortion of a photo-curing 3D printer. The method comprises steps of printing an original model by using photo-curing 3D printer based on DLP technology, measuring distances of four vertices to a model center in the original model, converting the distances into pixel coordinates with pixels as units according to the resolution specification of a projector, carrying out related calculation of the measured coordinates of the four points and coordinates of four corresponding points in a target model to obtain a mapping relation of eachpixel in each slice pattern in the original model and the target model, namely a homography matrix from a projection system and a printing platform, geometrically predistorting the slice pattern of the original model by using the principle of geometric transformation and then printing by using a predistortion slice pattern, judging whether a printing result is within an allowable error range or not, and repeating the above steps if not. The method has great significance for realizing large-size printing splicing and parts printing assembly and has high practical value.
Description
technical field [0001] The invention relates to the technical field of 3D printing, in particular to a method for correcting projection distortion of a photocuring 3D printer. Background technique [0002] A main branch of 3D printing technology is light-curing 3D printing technology, which uses the principle of curing liquid photosensitive resin after being irradiated with light beams, so that materials can be accumulated point by point or layer by layer. Stereolithography 3D printing technology is mainly divided into SLA and DLP projection technology, among which SLA is called stereolithography molding technology, which uses laser beams to quickly scan and irradiate the photosensitive resin point by point to make it solidify and shape. SLA technology can mold other materials other than photosensitive resin, and has the characteristics of wide application. DLP projection technology is to project the entire layer of image onto the photosensitive resin through the projection...
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IPC IPC(8): G06T5/00G06T7/70
CPCG06T7/70G06T2207/30204G06T5/80
Inventor 陈国大周绍林陈斌徐朔马旭刚
Owner BOOMING TECH LTD