Electric field driving jetting deposition 3D printing device and working method thereof

Abstract

The invention discloses an electric field driving jetting deposition 3D printing device and a working method thereof. The limits of the aspects, such as printing materials, receiving substrates, the resolution, of existing material jetting deposition 3D printing are broken through, especially the multiple-spraying-head technology is combined, and multi-scale multi-material structure integration 3D printing can be realized. According to the technical scheme of the electric field driving jetting deposition 3D printing device, a two-dimensional worktable is included and provided with a printing platform; a receiving substrate is arranged on the printing platform in an adsorbed mode; a jetting unit is arranged on the upper portion of the receiving substrate correspondingly; the jetting unit is connected with a Z-direction worktable and comprises an electric field generating electrode and a printing spraying head; the printing spraying head is arranged in an electric field area formed by the electric field generating electrode; the electric field generating electrode is connected with a positive pole of a high-voltage pulsed power supply; the printing spraying head comprises a nozzle and a storage cylinder which are mutually connected; and the storage cylinder is connected with a back pressure control unit and a printing material supply unit.

Description

technical field [0001] The invention relates to the technical fields of additive manufacturing and 3D printing, in particular to an electric field-driven spray deposition 3D printing device and a working method thereof. 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 ac...

AI Technical Summary

Problems solved by technology

However, there are still many deficiencies and limitations in electrohydrodynamic jet 3D printing, and it faces some difficult problems, mainly including: (1) The nozzle material is limited, and electrojet printing requires the nozzle to be conductive (as the first electrode), non-conductive nozzles cannot be used; (2) the material of the receiving substrate (substrate) is limited, and the receiving substrate (substrate) is used as the second electrode, which usually requires the substrate to be conductive. Printing on a non-conductive substrate Faced with many restrictions, some special treatment is required; (3) The printing height of the formed part (printed part) is limited. 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. Difficult to realize the fabrication of large-scale parts and macro / micro-span-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 (~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 Manufacturing; (4) Printing materials are limited, high voltage needs to be applied to the conductive nozzle during electrospray printing, 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; (5) Stable printing poor sex

If the printing material has good conductivity (or is a metal material), due to the short distance from the conductive substrate, it is easy to short circuit and spark discharge, and cannot continue printing

In addition, printing non-conductive materials on conductive substrates will cause changes in the electric field, which will affect printing accuracy and stability; (6) There are high requirements for the shape and flatness of the substrate. It can be carried out within a certain height above the horizontal conductive substrate, neither can it be printed on the surface of an existing object (more than 3mm), nor can it be printed on a non-flat, curved surface and other substrates, which limits its application in many aspects; (7) printing Inefficient for macro-scale structures and large-sized parts

Therefore, there are many problems and limitations in electrohydrodynamic jet 3D printing in terms of printing materials, nozzles, receiving substrates, height of formed parts, printing stability, and common printing capabilities. Unable to achieve multi-material multi-scale 3D printing

[0005] Therefore, the existing material jet deposition 3D printing technology has many deficiencies and limitations in printing materials, resolution, receiving substrate (substrate), etc., especially the existing technology cannot realize multi-scale multi-material integrated 3D Printing, these problems have seriously affected and restricted the improvement of the performance of these technologies, as well as wider industrial applications

Images