Research On One-step Forming Method Of 3D Microstructure Based On DMD

Nowadays,with the implementation of high-tech development strategies in various countries,additive manufacturing technology,as one of the representatives of the high-tech industry,has gradually expanded its application fields.3D printing technology has a wide range of applications in all walks of life with its new characteristics of additive manufacturing.Among a variety of 3D printing technologies,light curing technology,as the first type of 3D printing technology to appear,has low material costs and features such as flexibility play an important role in the use of 3D printing technology.But light curing printing technology also has the common problems of 3D printing technology: the printing time is slow,and the commonly used light curing technology is a point to surface or surface to body manufacturing method.This curing method is There are performance problems of the cured structure caused by the layer-by-layer anisotropy caused by point-by-point curing and layer-by-layer curing.Therefore,solving this problem is of great significance for improving the performance of cured structural parts and the development of light curing technology.In this paper,by studying the molding methods and principles of the existing light-curing printing methods,and by studying the bulk light-curing printing methods that have emerged in recent years,this paper proposes a single DMD to achieve a three-dimensional structure one-time exposure molding system.The main work is as follows:First,by studying the principle of computational holographic imaging,analyzing the realization of existing holographic encoding methods and imaging methods,and analyzing and studying the use conditions and scope of application of each holographic imaging method,focusing on the various realization theories of three dimensional imaging of computational holography And algorithms,and programmed to realize the calculation and simulation of various plane holograms and three-dimensional holograms,and to realize the simulation restoration.At the same time,the realization system was built to complete the actual reconstruction experiment of plane and three dimensional computational holography.Second,in view of the diffraction interference problem between the layered images in the tomography method in 3D holography,an optimization method is proposed to solve the interlayer image aliasing caused by the tomography method in 3D holographic imaging.This method uses spherical waves as the core to calculate the layered sub-amplitude hologram,and then uses the GS algorithm as an optimization method for image quality.The optimization results are analyzed and verified by simulation and experiments.Experimental verification proves that this method can solve the problems of inter-layer aliasing and crosstalk in three-dimensional holographic imaging,and the imaging quality has been significantly improved.Third,the 3D printing system was designed and built.The experimental system realized the use of green laser for curing,in order to solve the problem of rough junctions caused by point curing and layer curing during the curing of objects,and to further improve light curing The speed of three-dimensional structure molding.This paper proposes a printing method based on a single DMD spatial light modulator to achieve a single exposure to restore three-dimensional structures.This method takes only ten seconds to expose the polymer solution through a single exposure.A complete three-dimensional structure of the target can be obtained.