What is Additive Manufacturing (AM)?
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What is Additive Manufacturing (AM)?
A technical committee under ASTM international finally defined these processes appropriately as Additive Manufacturing (AM), as the technology builds 3D parts by adding material, as compared to subtractive manufacturing.
According to ISO/ASTM 52900-2015, Additive manufacturing is commonly given to the technologies that use successive layers of material to create a three-dimensional object. By using various techniques the printer builds the 3D geometry by constructing a thin 2D plane layer by layer.
There are seven main categories of AM technologies viz Vat photopolymerisation, Material Extrusion, Material Jetting, Binder Jetting, Powder bed fusion, Direct energy deposition and Sheet lamination.
Additive manufacturing technology types
Many companies have invented and introduced new techniques and Because the technology is fairly new, the companies who develop and introduce different techniques come up with their own marketing terms for the process, even though the core technique might be the same.
As per ISO/ASTM standards AM can be divided into the following seven process categories or types according to the techniques used to create those layers. Though companies who have developed some of the AM technologies have their own names.
Vat Photo Polymerization
In this process, a liquid photopolymer is selectively cured by light-activated polymerization to create a 3D part. It is based on the curing and hardening of photopolymers on exposure to ultraviolet radiation. The main types of this technology are Stereolithography (SLA), Digital Light Processing (DLP) and Continuous Digital Light Processing. Only Plastic can be printed using these technologies.
Binder jetting process
As the name implies this technique selectively deposits the bonding agent a binding liquid to join the powder material together to form a 3D part. This process is different to any other AM technology as it does not employ heat during the process like others to fuse the material.
Directed energy deposition
Direct energy deposition uses focused thermal energy such as a laser, electron beam, or plasma arc to fuse materials by melting as they are being deposited. Types include LENS, EBAM.
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