3D laser printing

Additive manufacturing: 3D laser printing:

Promet has invested in an advanced metallic 3D printer using the latest technology of Selective Laser Melting. This method of manufacturing gives engineers the possibility to design geometries not possible with conventional machining. Materials used include: Inconel, Titanium, Steel and Aluminium.

Promet is able to offer HYBRID manufacturing which is a mixture of both 3D printing and CNC machining:

Part with internal channels printed in SLM Machine with couplings, fine surfaces and tolerances machined on a CNC machine.

Laser printing is able to produce lightweight complex structures:

  • Saves space
  • Saves weight
  • Saves number of parts
  • High accuracy
  • Free form design
  • Short delivery time

Promet can manufacture one piece items that have never been available before;

Internal channels directly from the SLM machine

Lightweight structures without welding

Selective laser melting is an additive manufacturing process that uses 3D CAD data as a digital information source and energy in the form of a high-power laser beam, to create three-dimensional metal parts by fusing fine metal powders together. Manufacturing applications in aerospace or medical orthopedics are being pioneered.

The Process:

The process starts by slicing the 3D CAD file data into layers, usually from 20 to 100 micrometres thick, creating a 2D image of each layer; this file format is the industry standard .stl file used on most layer-based 3D printing or stereolithography technologies. This file is then loaded into a file preparation software package that assigns parameters, values and physical supports that allow the file to be interpreted and built by different types of additive manufacturing machines.

With selective laser melting, selectively melts thin layers of atomized fine metal powder are evenly distributed using a coating mechanism onto a substrate plate, usually metal, that is fastened to an indexing table that moves in the vertical (Z) axis. This takes place inside a chamber containing a tightly controlled atmosphere of inert gas, either argon or nitrogen at oxygen levels below 500 parts per million. Once each layer has been distributed, each 2D slice of the part geometry is fused by selectively melting the powder. This is accomplished with a high-power laser beam, usually an ytterbium fiber laser with hundreds of watts.

The laser beam is directed in the X and Y directions with two high frequency scanning mirrors. The laser energy is intense enough to permit full melting (welding) of the particles to form solid metal. The process is repeated layer after layer until the part is complete