Search for dissertations about: "laser machining"

Showing result 1 - 5 of 28 swedish dissertations containing the words laser machining.

2. 1. Adhesion to machined and laser ablated wood surfaces

   Author : Micael Stehr; KTH; []
   Keywords : LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; ablation; adhesion; checks; coating; cracks; excimer laser; gluing; IR laser; mechanical machining; mechanical weak boundary layer; microscopy; notched specimens; pine; planing; sample preparation; sawing; scanning electronmicroscopy; spruce; tip-cracks; UV laser; weak boundary layer; wood;

   Abstract : This thesis is a contribution to the R&D-program ValueActivation at KTH,Division of Wood Technology and Processingand containsfive papers related to the evaluation and development ofmachining techniques (mechanical and irradiation treatments)whereby weak boundaries at the wood surfaces in the form of(mechanical) weak boundary layers and (micro) cracks due tomechanical treatment can be avoided.The first paper describes the development of a method–using a UV laser–to study the mechanically weakenedboundaries. READ MORE

4. 2. Laser Flare Measurements and Kinoform Applications

   Author : Anna-Karin Holmér; Chalmers tekniska högskola; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fuchs heterochromic uveitis; kinoform; hot embossing; Nd:YAG; laser machining; laser flare meter; aqueous flare; excimer; retroreflector; traffic signs; diffractive optical element; iris angiography;

   Abstract : This thesis has two main parts. The first part treats the construction and use of a laser flare meter (Papers A and B). The second part deals with applications of kinoforms and consists of the sections "Kinoforms in laser machining" (Papers C and D) and "Diffractive retroreflectors" (Paper E). READ MORE

5. 3. Laser processing of Silica based glass

   Author : Patrik Holmberg; Fredrik Laurell; Valerio Pruneri; KTH; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; Fiber Bragg Gratings; photosensitivity; Glass; laser machining; optical fibers; fiber sensor; Physics; Fysik;

   Abstract : The main topic of this thesis work is photosensitivity and photo-structuring of optical fibers and bulk glass. Although research in the field of photosensitivity in glass and optical fibers has been ongoing for more than three decades, the underlying mechanisms are still not well understood. READ MORE

6. 4. High volumetric machining strategies for superalloy gasturbine components : Comparing conventional and nonconventional machining methods for efficient manufacturing

   Author : Jonas Holmberg; Johan Berglund; Anders Wretland; Tomas Beno; Joel Andersson; Sten Johansson; RISE; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Alloy 718; High volumetric machining; Conventional and Nonconventional machining; Material removal rate; Post processing; surface integrity; Residual stress; Microstructure; Deformation; Manufacturing; Surface and Joining Technology; Bearbetnings-; yt- och fogningsteknik; Production Technology;

   Abstract : There is a strong industrial driving force to find alternative manufacturing technologies in order to make the production of aero engine components of superalloys even more efficient than it is today. Introducing new and nonconventional machining technologies, as well as enhanced utilisation of today's high volumetric manufacturing, allows taking a leap to increase the material removal rate and the productivity. READ MORE

7. 5. Laser-Directed Energy Deposition : Influence of Process Parameters and Heat-Treatments

   Author : Suhas Sreekanth; Joel Andersson; Shrikant V. Joshi; Högskolan Väst; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Directed Energy Deposition; Alloy 718; Process Parameters; Heat Treatments; Nb- rich Phases; Production Technology; Produktionsteknik; Manufacturing and materials engineering; Produktions- och materialteknik;

   Abstract : Laser-Directed Energy Deposition (L-DED), an Additive Manufacturing (AM) processused for the fabrication of parts in a layer-wise approach has displayed an immense potential over the last decade. The aerospace industry stands as the primary beneficiary due to the L-DED process capability to build near-net-shape components with minimal tooling and thereby producing minimum wastage because of reduced machining. READ MORE