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Proceedings Paper

On-line measurements to control the forming process of glass vials
Author(s): Francesco Angrilli; Gianandrea Bianchini; Giulio Fanti; Massimo Mozzi
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Paper Abstract

The most relevant parameters to control the quality of glass vials are the internal and external diameters of the mouth and the height of the rim. A low cost vision system based on a 486 PC, a frame grabber, 4 CCD cameras (768 X 512 pixels) and I/O device to control the production of vials, by adjusting the flames temperature in the moulding section of the machine, has been developed and tested. A 24 mandrel machine rotating at about 300 rpm with a production capability of about 4200 pieces/hour had to be monitored with an accuracy of +/- 0.02 mm in the measure of the mouth diameters and +/- 0.04 mm on the rim height. In order to minimize the time delay required for the machine temperature compensation, the measurements had to be taken during the forming process. The system must be fast enough to follow the process, able to take into account the temperature variation of different classes of vials and far enough from the high temperature of the flames. A direct calibration procedure, using a reference vial, and a pyrometer to check the temperature range was derived. A long focus lens coupled with a bellow to put the system away from the flames was adopted. The algorithm implemented for the measurements and the machine temperature control is presented.

Paper Details

Date Published: 24 February 1993
PDF: 13 pages
Proc. SPIE 1820, Videometrics, (24 February 1993); doi: 10.1117/12.141377
Show Author Affiliations
Francesco Angrilli, Univ. of Padova (Italy)
Gianandrea Bianchini, Univ. of Padova (Italy)
Giulio Fanti, Univ. of Parma (Italy)
Massimo Mozzi, Univ. of Padova (Italy)

Published in SPIE Proceedings Vol. 1820:
Sabry F. El-Hakim, Editor(s)

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