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1 Archives of Foundry Engineering

1 2010

1 Sioma A.

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Measurements using three-dimensional product imaging

100%

Sioma A.

tom Vol. 10, iss. 3 spec.

41--46

This article discusses a method of creating a three-dimensional cast model using vision systems and how that model can be used in the quality assessment process carried out directly on the assembly line. The technology of active vision, consisting in illumination of the object with a laser beam, was used to create the model. Appropriate configuration of camera position geometry and laser light allows the collection of height profiles and construction of a 3D model of the product on their basis. The article discusses problems connected with the resolution of the vision system, resolution of the laser beam analysis, and resolution connected with the application of the successive height profiles on sample cast planes. On the basis of the model, measurements allowing assessment of dimension parameters and surface defects of a given cast are presented. On the basis of tests and analyses of such a three-dimensional cast model, a range of checks which are possible to conduct using 3D vision systems is indicated. Testing casts using that technology allows rapid assessment of selected parameters. Construction of the product’s model and dimensional assessment take a few seconds, which significantly reduces the duration of checks in the technological process. Depending on the product, a few checks may be carried out simultaneously on the product’s model. The possibility of controlling all outgoing products, and creating and modifying the product parameter control program, makes the solution highly flexible, which is confirmed by pilot industrial implementations. The technology will be developed in terms of detection and identification of surface defects. It is important due to the possibility of using such information for the purposes of selecting technological process parameters and observing the effect of changes in selected parameters on the cast parameter controlled in a vision system.