What is Selective Laser Melting (SLM) 3D Printing Technology

 The application of 3D printing technology can be traced back to the stereolithography (SLA) technology developed by Charles Hull of the United States in 1986. In the next 20 years, a number of 3D printing technology patents such as layered solid manufacturing (LOM) and fused deposition modeling (FDM) came out one after another. , SLM solution, etc. 

Since 3D printing technology started earlier in European and American countries, after more than 30 years of development, technologies such as SLA (stereolithography) and SLS (selective laser sintering) have been relatively mature. It is relatively perfect in R&D and manufacturing of high-temperature metal materials and equipment.



The development status of 3D printing technology


Since the beginning of the 21st century, various subdivisions of additive manufacturing technology have been further developed, such as digital light processing (DLP), multi-head jet technology (PloyJet), etc. have been developed. Special 3D printing materials and 3D printing equipment have also emerged as the times require. At present, the 3D printing industry in the world has generally formed a complete industrial chain covering raw materials, parts, processes, equipment, and services. Some key enterprises have been upgraded from single equipment manufacturers to comprehensive solutions from design to terminal parts manufacturing and business.




What is Selective Laser Melting (SLM)


SLM: Selective laser melting (selective laser melting), is a main technical approach in the additive manufacturing of metal materials. This technology uses laser as the energy source, and scans the metal powder bed layer by layer according to the path planned in the 3D CAD slice model. The scanned metal powder achieves the effect of metallurgical bonding through melting and solidification, and finally obtains the model designed. metal parts.


What is the difference between SLM and SLS


The main difference between this technology and SLS technology is that SLM directly heats the metal powder through the laser, does not rely on the binder powder, and the metal powder achieves the effect of metallurgical bonding through melting and solidification, and finally obtains the metal parts of the designed structure. In order to better melt metal, SLM technology needs to use laser beams with higher absorption rate of metals, so Nd-YAG lasers (1.064 microns) and fiber lasers (1.09 microns) and other laser beams with shorter wavelengths are generally used. The advantage is that SLM technology uses pure metal powder, and the density of formed metal parts can reach close to 100%; mechanical properties such as tensile strength are better than castings, and can even reach the level of forgings; density mechanical properties and forming accuracy are better than SLS a little better.



The laser galvanometer system is one of the key technologies of SLM.


Magic Box is the first producer to produce real face customized 3D printed figurines, using 3D portrait modeling and AI technology. 3D printed action figure of yourself is a unique and meaningful gift for everyone. Only uploading a 2D front face photo can custom a personal 3D printed figure. And only the head is customized, and the body is made according to the product pictures! The size is 8cm high and it's an environmentally friendly resin material. 3D printing by Selective Laser Melting.






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