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Proceedings Paper

Submillimeter bolt location in car bodywork for production line quality inspection
Author(s): Leopoldo Altamirano-Robles; Miguel Arias-Estrada; Samuel Alviso-Quibrera; Aurelio Lopez-Lopez
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Paper Abstract

In the automotive industry, a vehicle begins with the construction of the vehicle floor. Later on, several robots weld a series of bolts to this floor which are used to fix other parts. Due to several problems, like welding tools wearing, robot miscalibration or momentary low power supply, among others, some bolts are incorrectly positioned or are not present at all, bringing problems and delays in the next work cells. Therefore, it is of importance to verify the quality of welded parts before the following assembly steps. A computer vision system is proposed in order to locate autonomously the presence and quality of the bolts. The system should carry on the inspection in real time at the car assembly line under the following conditions: without touching the bodywork, with a precision in the submillimeter range and in few seconds. In this paper we present a basic computer vision system for bolt location in the submillimeter range. We analyze three arrangements of the system components (camera and illumination sources) that produce different results in the localization. Results are presented and compared for the three approaches obtained under laboratory conditions. The algorithms were tested in the assembling line. Variations up to one millimeter in the welded position of the bolts were observed.

Paper Details

Date Published: 21 March 2000
PDF: 10 pages
Proc. SPIE 3966, Machine Vision Applications in Industrial Inspection VIII, (21 March 2000); doi: 10.1117/12.380079
Show Author Affiliations
Leopoldo Altamirano-Robles, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)
Miguel Arias-Estrada, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)
Samuel Alviso-Quibrera, Univ. de las Americas (Mexico)
Aurelio Lopez-Lopez, Instituto Nacional de Astrofisica, Optica y Electronica (Mexico)

Published in SPIE Proceedings Vol. 3966:
Machine Vision Applications in Industrial Inspection VIII
Kenneth W. Tobin; John C. Stover, Editor(s)

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