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Comparison between two methods for 3D imaging of machine parts
KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
2015 (English)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Jämförelse mellan två metoder för 3D avbildning av maskindelar (Swedish)
Abstract [en]

Today the production time is shortened when components are made with additive manufac- turing and the finished products typically have very few defects. If the components quality is to be validated, it’s done with a Non-destructive testing method. In this thesis a test piece made of Inconel 939, that is used in high temperature application was examined with a non- destructive testing technique (NDT), computed tomography (CT) and with destructive test- ing (DT) by grinding the test piece down to a given position and taking images of the ex- posed surface. The purpose was to validate computed tomography images by doing a two- dimensional correlation between images from CT and DT using MATLAB. Due to tech- nical problems the resulting images were however not showing the same par of the test piece. Therefore the correlation method was instead validated. Modifying a 2D image from CT and running it in the code written in MATLAB could quantify the distortions in the images. Results are presented in figures and in tables. The table shows more detailed in- formation with exact coordinates and what correlation each area has. The figure shows the movements and direction of the changes. The result shows that the method can detect changes and does what was intended. 

Abstract [sv]

Idag tillverkas komponenter med additive manufacturing (AM) vilket gör att produktionsti- den blivit kortare och de färdiga produkterna har vanligtvis mycket få fel. Om komponen- ternas kvalitet ska valideras, görs det med en icke-förstörande provningsmetod. I denna avhandling har en provbit av Inconel 939, ett material som lämpar sig för höga temperaturer undersökts med en oförstörande provning teknik (NDT), datortomografi (CT) och förstö- rande provning (DT) genom att slipa sig ner i provbiten till en given position och ta bilder på ytan. Syftet var att validera datortomografibilder genom att göra en tvådimensionell kor- relation mellan bilder från CT och DT med hjälp av MATLAB. På grund av tekniska pro- blem så visar de resulterande bilderna inte samma område. Därför ska korrelationsmetoden valideras. Genom att ändra en 2D-bild från CT och köra den i koden skriven i MATLAB så att den distorderade bilden kan kvantifieras. Resultatet presenteras i figurerna och i tabeller. Tabellen visar mer detaljerat med exakta koordinater och vad varje delområde har för kor- relation. Figuren visar rörelser och riktning av förändringarna. Resultatet visar att metoden kan upptäcka förändringar och göra det som var tänkt. 

Place, publisher, year, edition, pages
2015. , 34 p.
Series
TRITA-STH, 2015:039
National Category
Computer Engineering
Identifiers
URN: urn:nbn:se:kth:diva-172941OAI: oai:DiVA.org:kth-172941DiVA: diva2:850864
External cooperation
EFTAB
Subject / course
Electrical Engineering
Educational program
Bachelor of Science in Engineering - Electrical Engineering
Supervisors
Examiners
Available from: 2015-09-03 Created: 2015-09-02 Last updated: 2015-09-03Bibliographically approved

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