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  4. Influence of an angular hatching exposure strategy on the surface roughness during picosecond laser ablation of hard materials
 
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Influence of an angular hatching exposure strategy on the surface roughness during picosecond laser ablation of hard materials

Citation Link: https://doi.org/10.15480/882.1906
Publikationstyp
Journal Article
Date Issued
2016
Sprache
English
Author(s)
Daniel, Christian  
Manderla, Jannik  
Hallmann, Sina  
Emmelmann, Claus  orcid-logo
Institut
Laser- und Anlagensystemtechnik G-2  
TORE-DOI
10.15480/882.1906
TORE-URI
http://tubdok.tub.tuhh.de/handle/11420/1909
Journal
Physics procedia  
Volume
83
Start Page
135
End Page
146
Citation
Physics Procedia (83): 135-146 (2016-01-01)
Contribution to Conference
9th International Conference on Photonic Technologies - LANE 2016  
Publisher DOI
10.1016/j.phpro.2016.08.026
Scopus ID
2-s2.0-84994049267
Publisher
Elsevier
Innovative chip breakers for cutting tools made of very hard materials require laser ablation and demand a high quality regarding the manufactured surface. When processing materials such as polycrystalline cubic boron-nitride or tungsten carbide the surface roughness by laser ablation reaches Sa= 1,0-2,9 μm compared to Sa= 0,42 μm achieved by grinding. Therefore in the presented research the influence of the hatching exposure strategy on surface roughness during picosecond laser ablation of tungsten carbide is examined. The areal, layerwise ablation process is separated into its elements which are represented by intersection zones between single and multiple laser vectors. Thus two mechanisms of roughness formation are identified and described by model functions. Further the mechanisms are transferred to areal ablation in which surface roughness decreases due to improved hatching angles compared to a commonly used one of φ= 0°/90°. With this approach the roughness is reduced by approximately factor 2,0-3,5 to Sa= 0,82 μm. In conclusion guidelines are derived which present favorable settings for high quality laser ablation processes.
Subjects
picosecond laser ablation
hatching angle
surface roughness
hard materials
tungsten carbide
DDC Class
600: Technik
Lizenz
https://creativecommons.org/licenses/by-nc-nd/4.0/
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