Top 10 3D Printing Technologies Explained in Detail

3D printing is an emerging technology in the field of manufacturing, known as "the manufacturing technology with industrial revolution". In recent years, with the advancement of industrial technology, 3D printing technology has been rapidly developing and getting widespread attention. In the face of many 3D printing technology, the following editor for you to organize the top ten 3D printing technology, with moving pictures to vividly show its principle!
Metal 3D printing technology can be directly used in the rapid prototyping of metal parts manufacturing, has a broad industrial application prospects, is the focus of the development of 3D printing technology at home and abroad, this issue following the 3D printing principles of polymer chapter again metal chapter, below, the editor with you to share the NPJ, SLM, SLS, LMD and EBM five metal 3D printing principles.

1. NPJ (Nano Particle Jetting)

NPJ technology is the latest metal 3D printing molding technology developed by the Israeli company Xjet, which uses nano-liquid metals that are deposited in an inkjet fashion to print up to five times faster than regular laser 3D printing, with superior accuracy and surface roughness, compared to regular laser 3D printing molding.
Here is how the Xjet device works.

Metal particle refinement
Metal particles in liquid droplets
Droplet injection molding process
Liquid phase discharge process

Sintered parts

SLM (Selective Laser Melting)
SLM, or Selective Laser Melting Molding, is currently the most common technology in metal 3D printing, using a finely focused spot to rapidly melt pre-set metal powders to directly obtain arbitrary shapes as well as parts with complete metallurgical bonding, resulting in a production density of 99% or more.

The laser galvanometer system is one of the key technologies of SLM, the following is the working diagram of the galvanometer system from SLM Solution.
laser emission
laser transmission
deflection unit
Laser Scan Melting
Metal powder melting process

In metal 3D printing, because of the complexity of the parts, it is necessary to print the support material, after the completion of the parts need to remove the support, and the surface of the parts to be processed.
Removing the part
Removal of support

Post-grinding treatment

3. SLS (Selective Laser Sintering)

SLS, or Selective Laser Sintering, is similar to SLM technology with the difference of laser power and is commonly used for 3D printing of polymers.
The following process is used to prepare plastic parts for SLS.
Model slicing in layers
Laser sintering process
Removal of components
SLS can also be used to make metal or ceramic parts, but the resulting parts are low density and require post-densification treatment before they can be used.
SLS for metal parts

4. LMD (Laser Metal Deposition)
LMD, or laser deposition molding, is a technology with a wide variety of names, different research institutions independent research and independent naming, commonly used names include: LENS, DMD, DLF, LRF, etc. The biggest difference with SLM is that the powder is gathered through the nozzle to the work surface, and laser convergence at one point, the powder melted and cooled to obtain a stack of molten cladding entity.
The following is how the LENS technology works.

Coaxial Powder Feeding
construction process