A light-transmitting and air-permeable cabin for continuous surface forming 3D printing and its operating method

Abstract

The invention discloses a pervious-to-light and breathable bin for continuous surface forming 3D printing, and an operation method. The pervious-to-light and breathable bin for continuous surface forming 3D printing comprises a bin body, a bin cover, a gas supply connector, a gas exhaust connector and breathable film. The bin body is of a cylindrical structure with the two ends open, the breathable film is arranged at one end of the bin body in a sealing manner, the bin cover is arranged at the other end of the bin body in a sealing manner, and a sealed space is formed. The gas supply connector and the gas exhaust connector are arranged on the bin cover and both communicate with the sealed space. The gas supply connector is connected with a gas supply system. According to the pervious-to-light and breathable bin for continuous surface forming 3D printing, and the operation method, in the printing process, through control on the gas supply system, a gas atmosphere with pressure intensity of a certain range and a certain gas concentration is formed in the sealed space, a uniform solidification dead zone of tens of micrometers to hundreds of micrometers is formed between a printed part and a gas permeation module by accurately controlling gas in the bin, it is avoided that the printed part adheres to the gas permeation module above, it is achieved that a printing platform continuously moves in the Z axis direction, and the efficiency of photocuring 3D printing is greatly improved.

Description

technical field [0001] The invention belongs to the technical field of 3D printing, and in particular relates to a light-transmitting and air-permeable cabin for continuous surface forming 3D printing. Background technique [0002] The existing light-curing 3D printing technology is based on the principle of layer-by-layer superposition, using a computer to process the 3D model layer by layer, obtain the geometric size of each layer and various parameters required for curing, and construct the original 3D model by layer-by-layer curing. However, the printing accuracy of this method is limited by the thickness of the layers. A smaller single-layer thickness can obtain higher printing accuracy, but it will also greatly increase the time required for printing. [0003] In order to solve this problem, Carbon has developed a light-curing 3D printing technology called "continuous liquid surface manufacturing technology" (CLIP) by improving the existing printing technology. This t...

AI Technical Summary

Problems solved by technology

[0005] CLIP-based pull-up continuous light-curing 3D printing equipment uses Teflon film as a light-transmitting and air-permeable forming window. The film lacks rigidity and is prone to deformation during the forming process, which not only affects the accuracy of the formed part, but also has a negative effect on the life of the film itself. greater impact

However, the porous or slotted structure of the forming window of the existing equipment using rigid forming windows has a significant impact on the optical path and has a greater impact on the accuracy of the printed parts

In addition, due to the gravity of the printed part itself and the adhesion resistance of the photosensitive resin, the bonding strength required between the printing table and the printed part is relatively high, so it is difficult to apply it to the forming of large parts

Although the traditional sunken light-curing 3D printing equipment can print large parts, it is limited by the flow characteristics of the photosensitive resin itself during the printing process, and the material replenishment is slow, making it difficult to achieve rapid continuous printing.

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