High-speed continuous photocuring type 3D printing device and working method thereof

Abstract

The invention discloses a high-speed continuous photocuring type 3D printing device and a working method thereof. The 3D printing device comprises a machine case body which is divided into an upper cavity and a lower cavity by a middle partition board, wherein an image forming module is arranged in the lower cavity, a window box and an oxygen supply cooling module are arranged in the upper cavity and are combined to be fixedly mounted on the middle partition board, the oxygen supply cooling module is arranged right below the window box, and the image forming module I is arranged right below the window box; a printing platform is arranged right above the window box and is mounted on a Z-direction worktable; and the window box is connected with a raw material feeding unit. The 3D printing device is integrated with the advantages of a compound oxygen-rich film, oxygen supply cooling and liquid surface auxiliary pressurization of the window box, so that the low-cost and efficient continuous printing of large-sized products with arbitrary shapes is realized, the range of applicable materials is wide, the printed products are high in precision and quality and good in uniformity, and the process is stable and reliable. An industrial-grade solution is provided for the high-speed continuous photocuring type 3D printing.

Description

technical field [0001] The invention relates to the technical fields of additive manufacturing and 3D printing, in particular to a high-speed continuous photocuring 3D printing device and a working method thereof. Background technique [0002] Stereolithography is the earliest, most mature, and most widely used additive manufacturing (3D printing) technology. After nearly 30 years of development, it has developed from the initial stereolithography (SL) to Many new processes, such as Microstereolithography, Integral SL, Projection Microstereolithography, Digital Light Processing (DLP) 3D printing, Continuous Liquid Interface Production , CLIP), two-photon polymerization laser direct writing 3D printing, etc. [0003] Traditional stereolithography is to use laser galvanometer or mask technology to control the illumination area, so that the resin is cured layer by layer in the controllable illumination area, and a three-dimensional solid model is generated after layer-by-layer...

AI Technical Summary

Problems solved by technology

However, this point-by-point scanning photocuring method has the following disadvantages: the forming efficiency is low (about 8~12x10 4 mm 3 / h); there is a large shrinkage during curing, and the workpiece is warped

[0005] (1) The oxygen-permeable and UV-permeable Teflon materials used are very expensive and require special manufacturing processes

[0006] (2) When the photosensitive resin undergoes a cross-linking and curing reaction, a large amount of heat will be released, which will cause the temperature of the beam irradiation area to rise. Reduced, affecting light efficiency and quality of formed parts

[0007] (3) A large number of heat sources are released by CLIP high-speed continuous curing. The existing solutions cannot discharge and release the heat in a timely and effective manner. Therefore, the current forming workpiece of the CLIP process is limited to printing of smaller-sized objects (the heat generated by small-sized parts Relatively less, heat exchange discharge release is relatively easy)

[0008] (4) For high-speed printing of photosensitive resin, when the separation speed reaches a certain amount, the biggest constraint is the reflow speed of the resin, especially when the viscosity of the resin is relatively high, it is more difficult to handle

[0009] Therefore, for the printing of large-sized objects, processes such as CLIP still face the problem of rapid replenishment of resin materials consumed by the liquid surface in the bottom dead zone and the solidified liquid surface.

Therefore, the existing continuous photocuring process (such as CLIP) is only suitable for printing small-sized objects, and the shape of typical printed parts is mostly limited to some hollow structures, which makes it difficult to achieve high-efficiency printing of large-sized and solid parts; and printing speed and Further improvements in quality are limited

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