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Content archived on 2024-04-30

Development of a new surface treatment for the die in gravity casting process

Objective


The main benefits are listed below:

The casting surface quality by PVD is improved
The total life time of the mould is increased
The non productivity is reduced

The difficulties encountered are:
Even the best PVD films need to be protected by traditional coating
If no additional coating covers the PVD film, there is soldering phenomenon of aluminium on the mould and difficulties for extracting the part.
The price of the PVD coating could be a problem
Mould cleaning in foundry could be a problem. However, solutions exist.
Mould cleaning in foundry could be a problem. However, solutions exist.

Mould cleaning in foundries.

A problem could be the cleaning of the core or part of the mold (cavity) without destroying the film of PVD.

Sand blasting the mould completely destroys the coating (tests done by CTIF and La RHODANIENNE).
So this cleaning method is absolutely not recommended.

Metallic moulds used in foundries are dressed with a die coating which provides lubrications, mechanical and thermal protection. This product is liable to fall into disrepair because of mechanical, thermal and physicochemical strains. It is then necessary to dress the refractory periodically. This has many disadvantages such as premature destruction of the mould, lower productivity, loss of raw materials and bad working conditions. The research intended will aim at optimizing surface treatment as well as application techniques on the metallic mould. A pre-heating procedure concerning tools will also be defined to be used in the process to lower thermal strains. The new permanent coating will be tested in foundries to take into account the needs of end-users at an industrial scale. The social, industrial and environmental impacts are expected to be high. The new permanent die coating will enable to increase productivity by 7 % and to obtain a higher standard of end-products. The refractory dressing operation which is very repetitive will be then eliminated.

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Funding Scheme

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CRS - Cooperative research contracts

Coordinator

Fonderie la Rhondanienne SA
EU contribution
No data
Address
Route de Mâcon
01090 Montmerle-sur-Saône
France

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Total cost

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Participants (7)

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