Dimenzijska kontrola velikih varjencev

Andrejević, Barbara (author), Bračun, Drago (mentor)

Diplomska naloga opisuje postopek kontrole geometrije kolena sesalne cevi hidroagregata, ki je izdelan s postopkom varjenja debele pločevine in je velikostnega reda 3 m. Predstavljeni so postopki zajema meritev, obdelave meritev ter primerjave meritev s CAD modelom. Meritve so opravljene z dvema laserskima merilnima sistemoma, Leica AT401 in Dimetix fls-c10, ki delujeta po metodi časa preleta laserskega bliska. Ugotovili smo, da pri meritvah z laserskim merilnikom Leica AT 401 ne zajamemo vseh detajlov površine. Vzrok za to je način merjenja z retroreflektorji, kjer se na merjencu izmeri majhno število točk, nato pa se preko njih generirajo površine. V nasprotju s tem, pa pri merjenju z laserskim daljinomerom Dimetix fls-c10, merilec nastavi poljubno gostoto izmerkov na merjencu in posledično zajame tudi manjša odstopanja. Najbolj natančno ocenimo odstopanje izmerkov od CAD-modela v primeru, kadar za primerjavo uporabimo oblak točk.

• Language: Slovenian
• Keywords: Kontrola dimenzij, laserski merilni sistem, oblak točk, CAD-model, analiza meritev, merilna negotovost.
• Work type: Bachelor thesis/paper
• Organization: FS - Faculty of Mechanical Engineering
• Year: 2017
• PID: 20.500.12556/RUL-92285
• Publication date in RUL: 14.05.2017

Secondary language

• Language: English
• Title: Inspection of dimensions of large welded objects

Abstract

The thesis describes a method for inspection of geometry of a hydro aggregate suction pipe knee which is produced by welding thick metal plates within the 3-meter size category. The thesis presents the measurement procedure, data processing and comparison with the CAD model. The measurements are performed with two laser measuring systems, the Leica AT401 and Dimetix fls-c10 that operate according to the time of flight method. Our findings suggest that the measurements performed with laser measuring Leica AT401 did not capture all surface details. The reason is the manner in which the measuring with retroreflectors is performed. The measurer acquires a small number of points, through which the surface is generated. In contrast, when measuring with the laser measuring system Dimetix fls-c10, the measurer sets an arbitrary measurement density on the measured object and consequently also covers minor deviations. The most accurate estimate of measurement deviations from the CAD model is shown when compared to the point cloud.

• Keywords: Inspection of dimensions, laser measuring system, point cloud, CAD-model, data analysis, measuring uncertainty.