Wyniki wyszukiwania - BazTech

1

Ablative laser cleaning of lacquer coating

Napadłek W., Kalman I.

Journal of Machine Engineering

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2012

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Vol. 12, No. 2

77--85

EN

The paper presents the selected results of tests on ablational laser removal of polymer lacquer coating with metallic filler (aluminium plates). The fibre laser with the Galvo head of the following parameters: the radiation wavelength λ = 1064nm, the exposition time of the laser impulse τ = 25ns, and the repetition frequency 30-500kHz was used. By changing the power thickness, repetition frequency, and scanning speed various effects of varnish, coating removal were obtained. The melting of the colourless lacquer coat was observed when small power thickness was applied. Multiple scanning with the laser beam of higher power thickness resulted in sequential removal of several to tens of micrometers of the lacquer coating. This technology brings very good perspectives for the renovation of lacquer coating systems in present vehicles (bodies, frames).

2

The numerical - experimental analysis of ablative laser cleaning nickel - based superalloy

Kosiuczenko K., Napadłek W.

Journal of KONES

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2012

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Vol. 19, No. 1

187-190

EN

The results of simulation the laser ablation cleaning for the surface of samples made for nickel-based superalloy ŻS6K-WI. this material is use to produce the first-degree blades of aircraft engine turbines. The laboratory investigations were used pulse neodymium laser Nd: YAG and laser ytterbium Nd: Y3Al5O12. In parallel with the experiment was performed numerical simulation of ablation process. The simulation results were used for selection of appropriate laser parameters (duration, pulse form and the course of pulse in time, power density). the short time of the phenomenon of ablation process (similar to 10 ns), the authors have chosen the finite element method (FEM) contained in the LS-Dyna. Since it is known that, the rate of thermal deformation is very large, for modelling the material properties of the material model was used Thermal-Elastic-Plastic. So chosen material model allows the dependence of material parameters (E, alfa, ni, Re, ET, Cp, k) on temperature. Scheme of laser ablation, diagram of laser power density, physical model, identification depth of the ablation, area where the temperature exceeded the melting temperature, in successive moments of loading are presented in the paper.

3

Laser ablation cleaning of the aeronautical jet engine turbine paddles

Napadłek W., Trawiński G.

Journal of KONES

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2010

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Vol. 17, No. 4

369-375

EN

Preliminary results ablation of the laser cleaning was introduced in the article elements of the turbine engine of airplane (blades, guide rings, the chambers of oxidising). Cleaning of these units was realized to obtainment of the metallically fine superficial layer for the chosen melts of Fe - C and on the datum feature Nor, prepare to the processes welds or the spraying thermal of coating barriers thermal TBCS. The chosen results of the selection of parameters were introduced in the support about steorology and the cleanness of the superficial layer. Various parameters: laser radiation power density, impulse duration, the frequency control and the laser spot lap stage were applied in laboratory experiments. Laser radiation influence effects were estimated on the surface photo, microstructure, chemical composition in microzones investigation basis. The stereoscopic microscopy, electron scanning microscopy (SEM) and the X-ray analysis were used in investigations. Very good cleaning effects are from oxides, accumulations of turbine blades. In particular, studied elements of aircraft turbine engine, characteristic surface and area topography of heat resistant nickel alloy, tests results of chemical constitution in the characteristic micro-zones of surface layer of high-temperature creep are presented in the paper.

4

Laserowe oczyszczanie łopatek turbin lotniczych silników odrzutowych odlanych z żarowytrzymałego stopu na bazie niklu ŻS6K–WI

Napadłek W.

Prace Instytutu Metalurgii Żelaza

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2009

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T. 61, nr 5

105-109

PL

Zaprezentowano wybrane wyniki oczyszczania laserowego łopatek turbiny silnika lotniczego, wykonanych z żaroodpornego stopu na bazie niklu ŻS6K–WI. W wyniku przeprowadzonych badań stwierdzono w warstwie powierzchniowej tego stopu szereg zanieczyszczeń typu organicznego i nieorganicznego, wynikających z samego procesu odlewania jak również z efektów oddziaływania czynnika ludzkiego. W wyniku selektywnego oczyszczania laserowego, uzyskano zarówno bardzo dobry efekt czystości powierzchniowej, jak również stwierdzono pewne zagrożenia wynikające z powstających nadtopień warstwy powierzchniowej.

EN

It has been introduced selected results of laser cleaning of turbine blades for aircraft engine, made of ŻS6K–WI high-temperaturecreep resisting alloy on the basis of nickel. As a result of conducted investigations it was found in the superficial layer this alloy series impurities organic and inorganic type, which come from casting process as well as from effects of influence of human factor. as a result of selective laser cleaning it was obtained both very good effect of superficial cleanness and also was confirmed certain dangers come from arising partial meltings of superficial layer.

5

Ablacyjne oczyszczanie laserowe - nowa perspektywa technologiczna w inżynierii powierzchni

Napadłek W.

Inżynieria Maszyn

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2007

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R. 12, z. 4

103-112

PL

Na podstawie literatury i prac własnych przedstawiono przegląd stanu wiedzy dotyczącej istoty ablacyjnego czyszczenia laserowego warstw powierzchniowych różnych materiałów konstrukcyjnych, posiadających nawarstwienia powstałe w procesach fizycznych oraz technologicznych. Opisano zjawisko oraz mechanizmy występujące w procesie ablacyjnego oczyszczania laserowego. Przedstawiono stosowane technologie oraz oprzyrządowanie niezbędne do realizacji ww. technologii, mającej bardzo szerokie zastosowanie, a także szerokie perspektywy w areologii, m.in. dla materiałów konstrukcyjnych, kompozytów, powłok, nawarstwień itp.

EN

Examples of technological applications of laser cleaning are presented. Surface layers of selected constructional materials like: grey cast iron, aluminium and copper alloys as well as builds of technological coatings were subjected to examinations. Optimal conditions of cleaning treatment by variation of energy density and pulse length were selected in respect to application. Analysis of surface topography as well as chemical constitution in micro-areas were studied.