A PowerPoint presentation on SELECTIVE LASER MELTING (SLM) IN ADDITIVE MANUFACTURING. BY: N.Sashi Kumar (III B.Tech )- 13121A03A3 N.V.Rohith (III B.Tech)-13121A03 Dept. of Mechanical Engineering,SVEC.
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A PowerPoint presentation on SELECTIVE LASER MELTING (SLM)
IN ADDITIVE MANUFACTURING.
BY:
N.Sashi Kumar (III B.Tech )-13121A03A3N.V.Rohith (III B.Tech)-13121A03A2
Dept. of Mechanical Engineering,SVEC.
Contents Introduction Process Printing methods Why SLM? SLM parameters Polymer properties for SLM Applications Conclusion
Introduction
3-D Printing.
Type of Industrial Robot.
Encompasses process like Extrusion, Sintering.
Process refers to sequential deposit of material on to powder bed using computer control.
Process
3-D Modelling.
Slicing.
Printing (depositing material).
Inspection.
Schematic representation.
Printing Methods
SELECTIVE LASER MELTING (SLM).
SELECTIVE LASER SINTERING.
FUSED FILAMEN FABRICATION.
Melting of powder bed using high energy lasers.
What is SLM?
The additive manufacturing technology.
SLM make it possibility to metal components layer by layer according to a 3D-CAD models.
Complex geometrics with out need of pre-production costs.
Melts the material on the powder bed layer by layer.
Why SLM?
Alloys of Titanium, cobalt chrome, aluminum can be fabricated.
No compromise in accuracy.
No need of any auxiliary holding devices – Melting on powder bed.
Completely melts the powder instead of fusing granules.
Obtains mechanical properties similar to conventional manufacturing.
Parameters that effect the SLM
AtmosphereTemperaturePowder Laser power & thickness
-ve effect on mechanical properties oxygen is responsible for pores SLM atmosphere must equipped with N, Ar, He.Laser Power & Thickness Laser intensity is different for different types of materials Laser thick ness is associated with granularity and type of
material
Atmosphere
TemperatureThe temperature is set between 220c and 3000c. It is easier to melt powder layer with laser
PowderLayer thickness 20µm to 100µm and SphericalBuilding speed, density of parts produced
Polymer properties for SLM
Thermal propertiesOptical properties Viscosity and Surface TensionParticle
Thermal properties
Crystallization Temperature (Tc, blue line) and Melting Temperature (Tm, red line)
Region between the Tc and Tm is called metastable Region or Sintering window .
The difference between Tm and Tc gives Metastable area.
Optical propertiesThe powder should be capable of absorbing the
energy of wavelength emitted from laser Viscosity And Surface tensionZero viscosity and low surface tension are
essential for successful SLM processing
ParticleThe particles should be spherical for free-
flowing on the bed of SLM machineThe particle is in between 20µm and 80µm
Applications
Bio-medical Automotive Building And Modeling
Applications
Food Industry Electrical Aerospace
Conclusion
SLM offers a great potential to solve the challenges of serving individual customer requirements, on the one hand, and high quality as well as low cost products
Any Queries ?
Thank you....
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