1. SEMINAR ON:- SELECTIVE LASER SINTERING PRESENTED BY :-NAYANKUMAR D. SURANA TE (MECHANICAL) SEMINAR GUIDE:- PROF. S. N. SHELKE. (HEAD OF MECHANICAL ENGG DEPT) FOR ACEDEMIC YEAR:- 2011-2012. `

2. Content Introduction Selective laser sintering process &set up Various binding mechanism Shrinkage compensation Advantages Applications Conclusion Reference

3. Introduction Sintering is the process by which bonding between common particle can be obtained. Selective Laser Sintering a Rapid Prototype technology. SLS is advance manufacturing process with use of powerful software SLS process capable of producing complex parts

4. SELECTIVE LASER SINTERING PROCESS & SET UP

5. Different Binding mechanism

6. Shrinkage Shrinkage Change in dimension of part during cooling. Change dimension disturb accuracy and bonding between particle To compensate shrinkage building strategies used should be selected properly.

7. Shrinkage compensation result to compensate shrinkage Laser exposure should be along hatching Part should be oriented along with X axis of chamber Select beam compensation factor properly Shrinkage along direction is more than across scanning

8. Effect of laser sintering parameter Mechanical properties obtained depends on energy density given. Laser power and scan speed does affect the properties. If the energy density constant for different laser power and scan speed the mechanical properties obtained are constant. If energy density is different mechanical properties are also different.

9. ADVANTAGES SELECTIVE LASER SINTERING Manufacturing of complex part is simple. Focusing on perticular section is possible. Use of different combination is material. Material saving upto 10 % over conventional process. functional part are durable,heat & chemical resistant Decreases development time. Economical over conventional process.

10. Disadvantages Shrinkage affects accuracy of part. High power is required. Skilled computer operator required. Set up cost is high.

11. APPLICATIONS OF SELECTIVE LASER SINTERING :- AEROSPACE HARDWARE. MEDICAL FIELD FOR IMPART BONE ELECTRONICS,PACKAGING. MILLITARY APPLICATION. INVESTMENT CASTING JIGS &FIXTURES

12. Applications:-

13. CONCLUSION SLS is advance manufacturing process capable of producing complex parts with accuracy SLS allows to use different combination of materials. The mechanical properties obtain depends only on energy density not on laser parameter. Shrinkage affect the accuracy of parts to compensate use the different building strategies We should use liquid state sintering with coated grain to bind the particle properly.

14. References 1)“Influence of building strategies on the accuracy of parts in Selective Laser Sintering ”,K.Senthilkumararan, Pulak M.pandey,P.V.M. Rao. 2)“Binding mechanism in selective laser sintering and Selective Laser Melting ”,Prof.Dr.Ir.J.P.Kruth,Ir.p.mrecells 3) “ Selective laser sintering brochure”, solid concept 4) designing of complex structure using Selective laser sintering ”,Hagen Sympo.sium. 5)C.R.D.M.industry U.K.