process of selective laser machining in additive manufacturing which includes the process of additive manufacturing and basic steps involved in it.

1. 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)-13121A03A2
Dept. of Mechanical Engineering,SVEC.

2. Contents
 Introduction
 Process
 Printing methods
 Why SLM?
 SLM parameters
 Polymer properties for SLM
 Applications
 Conclusion

3. 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.

4. Process
 3-D Modelling.
 Slicing.
 Printing (depositing material).
 Inspection.

5. Schematic representation.

6. Printing Methods
 SELECTIVE LASER MELTING (SLM).
 SELECTIVE LASER SINTERING.
 FUSED FILAMEN FABRICATION.
Melting of powder bed using high energy lasers.

7. 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.

8. 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.

9. Parameters that effect the SLM
 Atmosphere
 Temperature
 Powder
 Laser power & thickness

10.  -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

11. Temperature
The temperature is set between 220c and 3000c.
It is easier to melt powder layer with laser
Powder
Layer thickness 20µm to 100µm and Spherical
Building speed, density of parts produced

12. Polymer properties for SLM
Thermal properties
Optical properties
Viscosity and Surface Tension
Particle

13. 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.

14. Optical properties
The powder should be capable of absorbing the
energy of wavelength emitted from laser
Viscosity And Surface tension
Zero viscosity and low surface tension are
essential for successful SLM processing

15. Particle
The particles should be spherical for free-
flowing on the bed of SLM machine
The particle is in between 20µm and 80µm

16. Applications
Bio-medical Automotive
Building And
Modeling

17. Applications
Food Industry Electrical Aerospace

18. 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