Photogrammetry based system for the measurement of cylindrical forgings axis straightness

Photogrammetry based system for the measurement of cylindrical forgings axis straightness

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This paper presents an approach to the axis straightness measurement of cylindrical forgings and shows results of the first experimental measurement in laboratory conditions. The proposed image-based system is based on the assumption that actual shape of the cylindrical forging axis can be determined (in the simplest case) from four boundary curves which lie in two mutually perpendicular planes. Four boundary curves can be obtained by detecting forging edges in two images. The measurement approach was tested in laboratory conditions on the cylindrical rod sample of room temperatures with length of 700 mm and diameter of 45 mm. Results of image-based measurement ware compared with results of measurement by industrial 3D scanner Atos III Triple Scan. In the case of maximum deflection size, the difference between both measurement methods is less than 0.3 mm; in the case of angle of maximal deflection is less than 3 degrees. Despite the positive forecasts, additional measurements must be performed to determine the repeatability of the measurement on different sized samples. Further work will be devoted to testing and optimizing the measurement of hot forgings.

This paper presents an approach to the axis straightness measurement of cylindrical forgings and shows results of the first experimental measurement in laboratory conditions. The proposed image-based system is based on the assumption that actual shape of the cylindrical forging axis can be determined (in the simplest case) from four boundary curves which lie in two mutually perpendicular planes. Four boundary curves can be obtained by detecting forging edges in two images. The measurement approach was tested in laboratory conditions on the cylindrical rod sample of room temperatures with length of 700 mm and diameter of 45 mm. Results of image-based measurement ware compared with results of measurement by industrial 3D scanner Atos III Triple Scan. In the case of maximum deflection size, the difference between both measurement methods is less than 0.3 mm; in the case of angle of maximal deflection is less than 3 degrees. Despite the positive forecasts, additional measurements must be performed to determine the repeatability of the measurement on different sized samples. Further work will be devoted to testing and optimizing the measurement of hot forgings.

Edge detection ; Photogrammetry, Forging, Axis straightness measurement

Edge detection ; Photogrammetry, Forging, Axis straightness measurement

ZATOČILOVÁ, A.; POLIŠČUK, R.; PALOUŠEK, D.; BRANDEJS, J.

2014

13.04.2013

Proc. SPIE

Munich, , Germany

9780819496041

Optical Measurement Systems for Industrial Inspection VIII

0277-786X

Proceedings of SPIE

8788

Spojené státy americké

87881L-1

88781L-10

10