Digital light processing 3D printing device and method based on nonlinear focusing multi-partition exposure

Abstract

The invention discloses a digital light processing 3D printing device and method based on nonlinear focusing multi-partition exposure. According to the device, a stepping servo motor and a planetary reducer are mounted on the side face of a focusing stop of a DLP projector to serve as an electric focusing system, and a synchronous belt serves as a transmission device so as to control precise focusing of the projector stop. Partitioned multi-exposure curing of the DLP projector is controlled by a control mainboard. In the device, a high-resolution electric focusing mechanism is additionally mounted to achieve the aims of light source focal point changing and uniform curing during exposure curing. Meanwhile, the device can achieve the aims of reducing shrinkage, improving part edge strengthand therefore improving forming quality through nonlinear focusing multi-partition exposure during curing. The invention mainly relates to a multi-exposure intelligent 3D printer for additive manufacturing, in particular to a projector capable of achieving automatic and continuous focusing and exposure and a partition multi-exposure function.

Description

technical field [0001] The invention belongs to the technical field of augmented material manufacturing (3D printing), and in particular relates to a digital light processing 3D printing device and method based on nonlinear focusing and multi-partition exposure. Background technique [0002] With the development of additive technology, many scholars and engineers have further conducted in-depth research on printing methods, printing equipment, and printing materials, which has promoted the development of industrial production. Taking the radome used in the aerospace field as an example, its structure is mostly a sandwich structure, and the outer layer is a thin and dense surface layer, which can ensure the resistance to rain erosion and ablation. The core layer has high porosity and low dielectric. Electric constant and reliable mechanical properties, while having good mechanical properties and dielectric properties, it can also achieve broadband high transmittance in microw...

AI Technical Summary

Problems solved by technology

The DLP projector used in the DLP 3D printing equipment needs to be started and shut down at high frequency during the exposure molding process, and the projector bulb and circuit need a large current and high voltage to achieve short-term and high-frequency preheating work. Resulting in short projector lamp life and reduced projector accuracy

When replacing the bulb, it is not only easy to damage the DLP projector, but also requires professional measuring instruments to adjust and correct

However, the traditional bottom-illuminated 3D printer has a projector placed below, so the projection light source will have insufficient light intensity after passing through the bottom plate of the trough and the release film, and the focus positioning will not be accurate and can only be fixed at a certain height. Inhomogeneous curing and other phenomena will affect the forming accuracy of parts

In addition, general digital photolithography 3D printing equipment can only slice the entire image at one time during curing. When curing large-area parts, there will be problems such as edge warping, obvious shrinkage, and low curing accuracy at the edge of the product.

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