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Laser Polishing Process Explained in 40 Words
- 1. LASER POLISHING SUBMITTED BY MUHAMMED ASHIF V S5 ME ROLL NO 46
- 2. CONTENTS INTRODUCTION WHAT IS LASER POLISHING WORKING PRINCIPLE METHODS OF OPERATION ADVANTAGES DISADVANTAGES APPLICATION CONCLUSION
- 3. INTRODUCTION The surface roughness of a part or productstrongly influences its properties and functions including abrasion and corrosion resistance, optical properties as well as the visual impression the customer desires The laser-polishing has already been oneimportant branch of research in materialSurface processing as a new surface polishingtechnology
- 4. WHAT IS LASER POLISHING Laser polishing is a non contact surface finishing process that uses laser radiation to achieve subsequent surface smoothing
- 5. WORKING PRINCIPLE Laser beam is used to melting the surface of the work piece Due to the surface tension of the molten material the surface roughness is smoothed during the re-melting process. The resulting surface solidifies without cracks, pores or hidden defects out of the molten material. Nearly no material removal High shape retention Solid state laser source: continuous wave/pulsed, laser power 40- 500W
- 7. METHODS OF OPERATION There are two different methods of operations used in laser polishing 1. Macro polishing 2.Micro polishing
- 8. MACRO POLISHING Macro polishing is carried out with continues wave laser radiation
- 9. MACRO POLISHING Using continuous wave laser radiation the macro laser polishing process creates a continuous re- melted surface layer which is between 10pm-80µm can be polished. The re-melting depth have to be chosen according to the material and the initial surface roughness. ► Normally, fiber-coupled lasers are used with laser powers of 70-300W. The processing time is between 10 and 200 s/cm2 depending on the initial surface roughness, the material and the desired roughness
- 10. MICRO POLISHING For micro laser polishing pulsed laser radiation is used
- 11. MICRO POLISHING ►In contrast to macro laser polishing, micro laser polishing is a discrete rather than a continuous re-melting process ►The re-melting depth is in the range of 0.5-5µm. ► The pulse duration is normally in the range of 20-1000 nanoseconds and the molten material is already re- solidified when the next laser pulse hits the surface and creates a new melt pool. ► Fiber-coupled lasers are used. ►Processing time is less than 3 s/cm2 can be achieved.
- 12. Examples for polishing results are shown in Table
- 13. ADVANTAGES ▸ Automated machining ► Polishing results are independent of the operator ►High processing speeds, especially compared to manual polishing ▸ Selective polishing of specific areas ► Polishing of milled, turned, ground, and eroded surfaces ► Non-contact processing, resulting in low mechanical stress for the components ► No grinding or polishing waste
- 14. DISADVANTAGES ► Deviation in the form are not to be corrected ► The temperature rise below the surface may be high, causing unacceptable heating of the substrate or distortion of the work piece.
- 15. APPLICATIONS ►Selective laser polishing of matt surfaces ►Selective laser polishing of photo chemical etched surfaces ► Glass polishing Medical fields ►Designing surfaces by creating glosive effects.
- 16. CONCLUSION In comparison to conventional polishing processes like electro polishing, electro- chemical polishing or slide grinding, laser polishing opens up the possibility of processing of small areas (<0.1 mm²). Laser polishing enhances the appearance of design surfaces by glossive effects, which cannot be achieved with conventional machining methods without a high demand in human resources and time.
- 17. REFERENCES Willenborg, E., “Laserpolieren von Werkzeugstählen.” Dissertation RWTH Aachen University, Shaker, Aachen. (2005). Kiedrowski T.. Willenborg E.. Hack, S.,, K., “Generation of design structures by selective Wissenbach polishing of metals with laser radiation.” Proceedings of the 3rd Int. WLT-Conference on Lasers in Manufacturing 2005. 297-300 (2005). Willenborg, E., Wissenbach K.. Poprawe R., “Polishing by laser radiation,” Proceedings of the 2nd Int. WLTConference on Lasers in Manufacturing 2003, 451-456 (2003). Temmler, A., Willenborg, E., Wissenbach, K. “Structuring by Remelting.” Proceedings of the 5th Int. WLTConference
- 18. THANK YOU