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ON LINE QUALITY CONTROL OF STRIP CAST ALUMINIUM ALLOYS

Objective

The aim of the project is to achieve significant improvement in stripcast quality through an integrated control system and its use in process driving.

The production process chosen, continuous casting of A1 alloy strip, shows characteristics particularly suitable for the development / assessment of the control system.
A system for the automatic on-line evaluation of strip cast aluminium has been developed.

The project programme carried out through the study and development of: vision system, temperature control by IR equipment, thickness measurement by eddy current, expert system, data management and correlation between strip condition and process parameters has been succesfully concluded with the testing on the casting line of Nuova Comsal plant in Portovesme.

The system shows good performances being able to detect the defects and the anomalies on the strip surface and to suggest the corrective actions to the casting line operators.

Use of the system results in a strictly controlled process reducing the strip defect with an quality increase and cost reduction.

Being easy and flexible the system is suitable to be utilized in any existing casting line producing aluminium strip.
To achieve this target the following actions are necessary:
-continuous assessment of the strip temperature distribution immediately after salification
-thickness profile measurement of the strip both longitudinal and transversely
-detection of defects and identification of the type, importance and dimension of same. All the above mentioned measurements must be taken non destructively and by non contact method techniques in hostile industrial environments.

The detection of the surface defects has to be fulfilled in real time while manufacturing the aluminium strip.

The data obtained will be used in a further stage for:
-development of the data management system for the collection of data from various measurement devices and for their integration as quality report of the strip
-analysis of correlations between the process parameters and the collected measurements
-development of an expert system able to drive the casting operation using processed data
-final in-field test of the prototype system and evaluation of the improvements achieved.

Coordinator

Alures ScpA
Address
Via G. Bovio 6
28100 Novara
Italy

Participants (4)

Gamma Software Sas
Italy
Address
Via Giovanni Pascoli 46
14100 Asti
Nuova Comsal SpA
Italy
Address
Strada Paringianu
09010 Portoscuso Cagliari
Secad SA
France
Address
47 Avenue Alsace Lorraine
38000 Grenoble
Universidad Politecnica de Madrid
Spain
Address
Jose Gutierrez Abascal 2
28006 Madrid