Large-format digital projection type photocuring 3D printer

Abstract

The invention relates to a large-format digital projection type photocuring 3D printer. The large-format digital projection type photocuring 3D printer comprising a base, a first moving mechanism, a second moving mechanism, a mounting support, a digital light projector, a resin groove, a third moving mechanism and a printing platform; the first moving mechanism is mounted on the base; the second moving mechanism is mounted on the first moving mechanism and can move in the X direction through the first moving mechanism; the mounting support is mounted on the second moving mechanism, can move in the Y direction through the second moving mechanism and can move in the X direction along with the second moving mechanism through the first moving mechanism; the digital light projector is mounted on the bottom surface of an inner cavity of the mounting support; a groove opening of the resin groove faces upwards and is formed in the top of the mounting support, a rectangular boss is arranged in the center of the upper surface of the bottom of the resin groove, and the surface of the rectangular boss is plated with a release film; the third moving mechanism is vertically mounted on the base; and the printing platform is installed on the third moving mechanism and can move in the Z direction through the third moving mechanism, and the X direction, the Y direction and the Z direction are perpendicular to one another.

Description

technical field [0001] The invention relates to the technical field of 3D printing, in particular to a large-format digital projection light-curing 3D printer. Background technique [0002] As the earliest commercial application process in the 3D printing system, light-curing molding has the characteristics of high molding precision and fast molding speed. In recent years, with the continuous enrichment of composite photosensitive resins such as ABS, heat-resistant resin, and ceramic resin, it has shown more potential for a wide range of applications. Digital light projection molding (digital light processing, digital light) completes the molding of the cross-sectional profile of a part with one projection. It has the advantages of fast molding speed, high precision and high surface finish. It is widely used in precision casting, aerospace, biomedical and other industries. Constrained digital light projection molding has become a key research and development direction becau...

AI Technical Summary

Problems solved by technology

[0003] The main problems currently existing in constrained digital light projection molding are: (1) limited by the projection size of the digital light projector, it is difficult to complete large-area printing tasks; (2) when the cured layer is separated from the constrained substrate, the excessive peeling force will Cause printing defects and failure of the printing process, thereby reducing printing efficiency and process reliability, and large-area printing exacerbates the problem of peeling of the cured layer

Aiming at the problem of limited printing area, some researchers proposed to use multiple digital light projectors to project at the same time, control the seamless splicing of the mask images projected by the digital light projectors on the surface of liquid resin, and increase the printing area, but the number of projectors increases with the printing area. The cost of printing is too high, and it is difficult to realize engineering application; some researchers also proposed to use a single projector to achieve large-area printing by controlling the relative movement between the resin tank, projector, and printing pallet.

However, in constrained digital optical modeling, the peeling force of the cured layer from the substrate increases sharply with the printing area, and the current large-area digital optical printers do not mention the process reliability problems caused by the peeling force of the cured layer

In addition, in the solution of using a single projector, the problem of printing accuracy caused by the problem of motion synchronization and the problem of parallelism between the projector and the resin tank also need to be solved

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