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What are the main technological processes of 3D printing?
Jan 16, 2018

1.Fused deposition modeling (FDM)

FDM heating head and hot melt material (ABS resin, nylon, wax, etc.) heated to a critical state, make its show semiliquid state, then the heating head under software control, moving along the 2 d geometrical locus of CAD to determine the nozzle will be half of the material flow state extrusion, transient solidification material forming contour in the shape of a thin layer.

2.Stereo lithography Appearance (SLA)

The SLA light curing device slices the object's 3d digital model before starting to "print" the object.Under the control of the computer, the ultraviolet laser will scan the liquid resin point by point along the different sections of the parts.The thin layer of resin that is scanned produces an aggregate reaction, which is gradually formed by the point and eventually forms a thin layer of solidified cross section of the part, while the unscanned resin remains in its original liquid state.When a layer of curing, lifting worktable moving a layer thickness of distance, the cured resin surface to cover a layer on a new layer of liquid resin, scanning the again to solidify.The newly solidified layer is firmly bonded to the previous layer, so that the cycle repeats until the entire prototype is finished.

3. Selective laser sintering (SLS)

SLS technology is similar to the SLA photocuring process, which requires the laser to solidify the material into a whole.In contrast, the SLS process USES an infrared laser beam, and the material is made from a light-sensitive resin into a powder of plastic, wax, ceramics, metal or its complex.4. Layer overlay manufacturing (LOM)

In layer superposition in the manufacturing process, the machine will be single-sided coated with hot-melt adhesive foil through hot roller heating, hot sol can produce viscous under heating condition, so the paper material, ceramic foil, foil, etc will glue together.Then, the upper laser is layered with the CAD model, and the foil is cut into the internal and external contours of the parts made by laser beams.Then a new layer of foil is put on top of it, which is cemented together with the cutting layer below by the thermocompression device, and the laser beam is cut again.Then repeat the process until the entire part is printed.

5. 3d printing process (3DP)

In terms of working mode, 3d printing is the closest to traditional 2d inkjet printing.Like SLS process, 3 dp is by putting the powder to make the parts into a whole, the difference is that it is not bonded by means of laser melt, but through the nozzle jet of binder.Under the control of the computer, the nozzle is operated according to the two-dimensional data of the model section, and the adhesive is selectively injected in the corresponding position, and finally the layer is formed.In each layer after bonding, molding cylinder fell by a distance equal to the thickness, for powder cylinder for a period of rising height, launch excess powder, and spread by the powder forming cylinder roller, paving be compacted.It loops until the whole object is bonded.

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