High-precision electric field driven spray deposition 3D printer and working method thereof

Abstract

The invention discloses a high-precision electric field driven spray deposition 3D printer and a working method thereof, and solves the problems of a traditional 3D printer on multiple aspects of resolution, stability and controllability; high-precision printing of multilayer structures can be realized; the printing process is observed and monitored in real time; and high-precision pattern printing is performed on insulation substrates through electric conducting materials. The high-precision electric field driven spray deposition 3D printer comprises a mounting baseplate; a Y-axle worktable is arranged on the mounting baseplate; a vacuum absorption platform is fixed on the Y-axle worktable; a printing substrate is absorbed on the vacuum absorption platform; a printing nozzle and a vertical observation camera are correspondingly arranged above the printing substrate, and are connected to a Z-axle worktable; the Z-axle worktable is fixed on an X-axle worktable; a squint observation camera is correspondingly arranged on one side of the printing nozzle; an LED light source and a far infrared curing light source are correspondingly arranged on the other side of the printing nozzle; theprinting nozzle communicates with a storage bottle; and the storage bottle is arranged on a lifting table.

Description

technical field [0001] The invention relates to the technical fields of additive manufacturing and 3D printing, in particular to a high-precision electric field-driven jet deposition 3D printer and its working method. Background technique [0002] Material jet deposition 3D printing is an additive manufacturing method that selectively deposits forming materials based on the principle of droplet jetting. At present, a variety of material jet deposition 3D printing technologies have been proposed in the world, mainly including inkjet (thermal bubble or piezoelectric) printing. , aerosol jet (aerosol jet), polymer jet (PolyJet), nanoparticle jet technology (NanoParticle Jetting), etc. However, these traditional materials are limited by spray deposition forming materials, usually require printing materials with low viscosity (usually less than 100cP), the types of materials available for printing are limited, and the printing resolution is not high. It is still difficult to achi...

AI Technical Summary

Problems solved by technology

However, electrohydrodynamic jet 3D printing still has many deficiencies and limitations, and faces some difficult problems, mainly including: (1) It is difficult to realize high-precision multi-layer printing, and the alignment of multi-layer printing cannot be guaranteed; ( 2) Usually the size of printed graphics or structural features is very small (micro-nano scale), and the printing speed is very high, the distance between the nozzle and the substrate is very small, it is difficult to observe and monitor the printing process in real time, and the accuracy and quality of the printed graphics cannot be controlled (3) Existing methods such as injection pump feeding have poor feeding accuracy and stability, and cannot meet the requirements of high-precision graphic printing; (4) it is difficult to realize high-precision printing of conductive materials on insulating substrates (substrates). and stable and reliable printing

Due to the accumulation of conductive materials on the insulating substrate (substrate), the stability of the electric field is seriously affected, which in turn has an adverse effect on the accuracy, quality and stability of the printing process of the printed graphics; (5) the printing height of the formed part (printed part) Due to the limitation of the distance between the conductive nozzle and the conductive substrate, the height of electrojet printing is generally limited to less than 3 mm, making it difficult to realize the manufacture of large-scale parts and macro / micro-scale structures

This is because the electric field force of electrospray printing to form a stable cone jet will weaken as the distance between the conductive substrate and the conductive nozzle increases, and when it exceeds a certain height (about 3mm), the electric field force is not enough to maintain the stable cone jet. Generated, unable to continue printing

At the same time, as the printing height continues to increase and change, it is necessary to continuously adjust the parameters to increase the electric field force to ensure a stable cone jet to achieve printing, which is difficult to achieve in the actual printing process, so electrojet printing cannot truly achieve macro / micro cross-scale At the same time, 3D printing cannot be truly realized; (6) The receiving substrate / substrate (substrate) material is limited, and the receiving substrate (substrate) is used as the second electrode, which usually requires the substrate to be conductive. There are many restrictions when printing on the substrate, and conductive treatment is required; (7) The morphology and flatness of the substrate are highly required. The surface of the real object (more than 3mm) has been printed, and it cannot be printed on non-flat, curved substrates, etc., which limits the application in many aspects and cannot realize true 3D printing; (8) The printing material is limited, and the electrojet printing work During the process, a very high voltage needs to be applied to the conductive nozzle, and the printing of certain cells or bioactive tissue materials is limited

In addition, some metal materials or materials with very good conductivity are prone to short-circuit discharge during the printing process, and the printing process is not stable. Therefore, electrojet printing faces great limitations in printing biomaterials and metal materials; (9) printing macro Low efficiency when scaling structures and large size parts

[0005] Therefore, the existing material jet deposition 3D printing technology has many deficiencies and limitations in printing materials, resolution, receiving substrate (substrate), etc., and cannot realize high-resolution graphic printing, especially high-resolution multi-layer printing. Structural printing and printing of complex three-dimensional micro-nano structures, especially the high-precision printing of conductive materials on insulating substrates, does not have the ability to monitor and observe in real time during the printing process

Poor stability and controllability during printing

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