US 11,745,431 B1
Rapid DLP 3D printing control parameter optimization method combining continuous and layered molding
Lifang Wu, Beijing (CN); Lidong Zhao, Beijing (CN); Zening Men, Beijing (CN); Yandong Li, Beijing (CN); Feng Yang, Beijing (CN); MingLi Xiang, Beijing (CN); and Zun Li, Beijing (CN)
Assigned to BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed by BEIJING UNIVERSITY OF TECHNOLOGY, Beijing (CN)
Filed on Jul. 19, 2022, as Appl. No. 17/868,653.
Claims priority of application No. 202210540382.1 (CN), filed on May 13, 2022.
Int. Cl. B29C 64/393 (2017.01); B33Y 50/02 (2015.01); B33Y 10/00 (2015.01); B29C 64/124 (2017.01)
CPC B29C 64/393 (2017.08) [B29C 64/124 (2017.08); B33Y 10/00 (2014.12); B33Y 50/02 (2014.12)] 7 Claims
OG exemplary drawing
 
1. A rapid DLP 3D printing control parameter optimization method combining continuous and layered molding, comprising the following steps:
Step 100: slice a three-dimensional model to be printed to obtain a slice number i, determine a printable area of each slice, and calculate a maximum value DMAX[i] of shortest distances from all points in the printable area of each slice to its boundary points;
Step 200: based on a standard solver of an open source computational fluid dynamics (CFD) software OpenFOAM, and according to liquid-liquid two-phase flow printing scene of resin-fluorinated oil, a VoF model is used to establish a numerical simulation model;
Step 300: establish a Cartesian coordinate system according to the printing scene, according to the DMAX[i] obtained in step 100 and the numerical simulation model established in step 200, Poiseuille flow characteristic analysis is used to obtain a print mode of each slice;
Step 400, according to the slice printing mode obtained in step 300, obtain slices printed in a continuous manner, calculate a rising speed of a continuous forming printing platform according to the Lambert-Beer law and write it into a printing configuration file;
Step 500: according to the slice printing mode obtained in step 300, obtain slices printed in a layered manner, calculate a relationship between its resin leveling time and other control parameters, and according to Jacobs work curing curve to obtain an expression of layered resin curing time, and write the obtained control parameters into the printing configuration file;
Step 600: before printing starts, use camera monitoring to determine a printing origin, and then complete the printing according to the printing configuration file.