A kind of 3D printing device and its printing method

Abstract

The invention discloses a three-dimensional (3D) printing device and a printing method thereof. The 3D printing device comprises a base, an exposure mechanism, a control mechanism and a printing mechanism, wherein the exposure mechanism and the control mechanism are arranged in the base; the printing mechanism is arranged on the base; the printing mechanism comprises a mould, a printing platform arranged on the mould in a sliding way, and an inclined pulling assembly arranged at the bottom end of the mould; the inclined pulling assembly comprises a mounting bracket fixedly arranged at the upper end of the base, and a support frame movably connected with the mounting bracket by a connecting piece; the support frame is provided with a resin frame; the support frame is further provided with a pull rod at the bottom of the side opposite to the connecting piece; the pull rod is connected with a drive motor; the exposure mechanism comprises a projector; a projection lens of the projector is arranged under the resin frame; the exposure from bottom to top is adopted, so that the middle of a curing layer is not convex due to surface tension, and the flatness is guaranteed; the inclined pulling assembly is adopted, so that the service life of a film on a transparent bottom plate of the resin frame is greatly improved.

Description

technical field [0001] The invention relates to a 3D printing device and a printing method thereof, belonging to the technical field of printing equipment. Background technique [0002] A 3D printing device, also known as a three-dimensional printer, is a machine that uses cumulative manufacturing technology (that is, rapid prototyping technology). Its principle is to put data and raw materials into a 3D printer, and the machine builds products layer by layer according to the program. At present, it is more common for 3D printing devices to use SLA three-dimensional printing (also known as stereolithography, light modeling), and the specific working methods are mainly divided into the following two types: [0003] 1. The liquid tank is filled with liquid photocurable resin, which will be cured in the set area under the irradiation of a certain dose of light waves. When the molding starts, the working platform is under the liquid surface, and the focused laser is on the liqui...

AI Technical Summary

Problems solved by technology

When the 3D printing device with this structure is solidified, because the tension between the solidified layer and the transparent bottom plate at the bottom of the liquid tank is very high, the printing platform cannot be pulled up vertically, and two platforms with a certain height difference are required to translate, resulting in a relatively small plane area of ​​the liquid tank. Large, it takes up space and wastes liquid photocurable resin, and the repeated translation makes the film on the transparent bottom plate of the irradiation platform easily damaged due to friction, and the life is short. Generally, only 8000-10000 layers can be printed and must be replaced. It not only increases the replacement process but also greatly increases the printing cost

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