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....