The Equipment Development And Process Research Of The Stereolithograph Based On CLIP

With the rapid development of additive technology in recent years,there are more and more manufacturing methods of additive manufacturing technology,and the application scenarios are becoming more and more extensive.However,the manufacturing defects common to additive manufacturing technology still severely restrict its development.For example,the additive manufacturing method has problems such as step effects,poor mechanical properties of the model,poor surface quality,and excessive molding time.However,in 2015,a technology of continuous liquid interface production(Continuous Liquid Interface Production,CLIP)was proposed to subvert the previous additive manufacturing method and solve the problems existing in the traditional additive manufacturing method described above.Since its introduction,this technology has attracted more and more researchers’attention because its manufacturing speed is dozens,or even hundreds of times,of traditional additive manufacturing methods.However,there are still many problems in terms of equipment cost and manufacturing efficiency and accuracy.This subject is to carry out corresponding research on these existing problems,in order to be able to further optimize and improve them.This article first analyzes the forming method of the CLIP process and the mechanism of the dead zone.Then,the CLIP equipment was built according to the special molding method of CLIP,which mainly involved the design and selection of mechanical structures,hardware system design and electronic device selection,and software system construction.Provided a set of self-developed CLIP equipment ideas,and also laid the foundation for subsequent printing experiments and process technology analysis.In order to ensure the smooth running of the CLIP printing experiment,the pixel accuracy of the molding surface of the CLIP device was tested,and the relationship between the UV light control current and the light intensity of the curing machine was linearly processed.The light-curing properties of the special rigid photosensitive resin were studied,and the curing parameters were determined.Experiments with different printing speeds were performed to analyze the printing effect of the prints,and the micro-morphology of the models of CLIP printing and DLP printing were compared.Aiming at the problem that the print bubbles and the dead zone filling speed of print are not high during the CLIP printing process,the print platform was improved and the software bubble removal function was added to remove bubbles.Analysis of the low filling speed of the resin in the analysis dead zone is because the oleophobic properties of the semi-permeable membrane are too poor,resulting in poor fluidity of the resin.Various methods of oleophobic modification of PDMS semi-permeable membranes were analyzed,and the way to make micro-nano structures on the surface of PDMS was determined to reduce the wettability of PDMS surface.A PDMS film with a V-channel micro/nano surface structure was prepared using AAO with a V-channel micro/nano structure as a template.The fully automatic high-temperature contact angle measuring instrument was used to test the contact angles of PDMS of rigid resin on the plane and PDMS with micro-nano structure on the surface,and the contact angles were from62~o Increased to 83~o.It is proved that the PDMS surface with micro-nano structure can improve the oleophobicity and provide a solution for increasing the resin filling speed of the dead zone on the semi-permeable membrane.Finally,the characteristics of CLIP printing and printings are analyzed,and the factors affecting the printing speed and quality of CLIP printing are summarized.