Understand the light projection technology of automated manufacturing

Additive manufacturing, also known as 3D printing , and 3D machine vision are exciting new technologies. When we combine the two, they have the potential to create some new and efficient production models, especially Interested in the concept of “automated production” – a “one-stop” machining shop that uses 3D printing technology to create parts without manual supervision and machine vision technology for measurement and testing. The part.

Texas Instruments' DLPTM technology and its core digital micromirror device (DMD) provide the key to achieving this. DLP technology is an optical technology for projection display that was born in 1996 and is now widely used. When applied to problems in 3D printing and machine vision, DLP technology delivers high-resolution imaging, speeds up production and lowers manufacturing costs, helping to make the vision of automated production a reality. Because of this, it has become a classic example of using old technology to solve new problems.

3D printing with DLP technology

Light curing (SLA) is a common 3D printing process that is similar to traditional printing. Just as toner is deposited on paper, a 3D printer can deposit a layer of material in a series of 2D sections so that layers are stacked to create a 3D object. In the case of SLA technology, the material is a resin that can be cured by an ultraviolet (UV) light source. When the resin cures, its monomers can crosslink to create a polymer chain that can produce a solid material.

When SLA technology is combined with DLP technology, the DMD is illuminated by a UV light source. The pixels of the DMD are then processed separately and the image is projected onto the resin layer, resulting in a series of sections that can form a 3D object. The use of DLP technology offers a number of advantages, such as the ability to image individual pixels from a DMD using optical technology, rather than allowing the source to be imaged directly onto the resin, which optimizes resolution and feature size.

Light curing using DLP technology

Photocuring with DLP technology: Objects are detailed in 3D Computer Aided Design (CAD) models. The printer software converts the virtual model into a series of skins to accommodate the printing of the object. (provided by Texas Instruments)

Compared to traditional laser-based SLA machines that produce 100 micron voxel (3D pixels), DLP-based SLA machines can achieve 30 micron voxels. The smaller the voxel, the smoother the object is transformed, which means less post-production processing is required to complete the object creation. In addition, because the imaging and creation of the entire structural layer is done simultaneously—rather than one voxel, layer by layer, these machines complete larger prints faster than traditional SLA machines.

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