Method for reducing differential shrinkage in stereolithography

摘要

The present invention relates to a new and improved stereolithography method and system for generating a three-dimensional object by forming successive, adjacent, cross-sectional laminae of that object, thereby providing an object being specially processed to reduce differential shrinkage.

主权项

1. A method for the manufacturing of at least one three-dimensional object wherein the object or part thereof comprises a plurality of adhered laminae, comprising the steps of:
a) depositing a layer of a liquid resin, over a manufacturing area comprising previously formed lamina n−1 of the object; b) selecting a stimulation power for forming layer n, wherein the stimulation power is either a predetermined value or a value based upon parameters of one or more laminas selected from laminas n−5 to n+5 such as to minimize shrinkage or deformation of the object; c) exposing at least part of the manufacturing area to stimulation of a stimulation pattern determined based on a computer-generated CAD file of the object using the stimulation power selected in step b, thereby polymerizing the resin of the stimulated areas and forming a lamina n of the object; d) selecting the pre-stimulation waiting time for forming lamina n+1, wherein the pre-stimulation waiting time is either a predetermined value or a value based on parameters of one or more of laminas n−5 to n+5 such as to minimize shrinkage or deformation of the object; and; e) successively repeating steps a) through d) wherein in at least one of steps (b) and (d) a value based upon parameters of one or more laminas selected from laminas n−5 to n+5 is selected.