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Abstract

The objective of this project is to carry out a demonstration pilot operation for continuous billet casting in order to evaluate the contribution of high-power ultrasound techniques applied alone or together with other lubrication in terms of productivity and improvement of the surface quality of the products.

Principal experimental results

The use of high-power ultrasound at the mould level means that the lubrication mechanisms are modified in terms of:

- An increase in thermal transfer (averaging 6-7%) found in the majority of tests.
- A systematic and significant reduction in the friction forces acting on the mould (about 40%) regardless of the casting conditions.
- A significant improvement in the state of the surface of the billets characterised by a reduction in the depth of the wrinkles and surface roughness of between 0 and 50% with an average of 25%.

On the other hand, the use of ultrasound produces a result contrary to our expectations when it comes to surface defects, i.e. an increase in the number of certain defects, in particular corner cracks. A metallographic analysis has shown that these defects are linked to a differential in the solidified thicknesses in the mould between the centre of the faces and the corners, this differential having a tendency to increase in the presence of ultrasound. This problem, which is "specific to certain steel grades for springs" is overcome by using an appropriate hot head mould. This solution has been successfully tested on some castings. castings.

Additional information

Authors: RIEGERT J-P, Ascometal Allevard, Goncelin (FR);NOGUES M, Ascometal Allevard, Goncelin (FR)
Bibliographic Reference: EUR 20072 FR (2002), pp.42. Euro: 7.00
Availability: EUR-OP reference: KI-NA-20072-FR-S. Available from EUR-OP sales agents. URL: http://eur-op.eu
ISBN: ISBN: 92-894-2152-5.
Record Number: 200214330 / Last updated on: 2002-02-18
Category: PUBLICATION
Original language: fr
Available languages: fr
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