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  • Influence of steelmaking processes on welding (cladding, repairing) and high speed machining of mould dies: Consequences of these metallurgical parameters on chemical etching


The mould industry has to face two developments: the use of high-speed machining (HSM) for mould realisation, and repairing or cladding by welding. Moulds, especially for plastic injection, have still to be etched to ensure mould piece surface aspect. Etching after welding raises some more problems, usually the welded bead and the heat affected zone are visible on the finished etched surface. So etching parameters, as well as welding parameters, have to be optimised to ensure non-visible surface on the finished mould. During the project, welding, machining and etching have been considered independently and also in interaction when these processes are used successively.

Influence of metallurgical parameters has been of specific concern throughout this project. It has been shown that mould welding is also possible for surfaces designed to be polished or etched, but welding procedures as well as steel grades must be adapted. Etching of HSM surface or nitriding of etched surfaces has been unsuccessfully tried. Etching is a delicate operation, the success of which is closely linked to steel homogeneity and steel corrosion resistance. High-speed milling of hardened steel tools with CBN or carbide tool has been better understood. Unfortunately, usual metallurgical machinability treatments have proved to be inefficient or even detrimental for HSM performances. Mould and tool steels will have to be adapted to follow technological evolution.

Additional information

Authors: LE CALVEZ C, CLI, Le Creusot (FR);MABELLY P, CLI, Le Creusot (FR);GUNNARSSON S, Uddeholm Tooling, Hagfors (SE);MOSCATO G, Standex International, Gorgonzola (IT);CAMBIER P, Standex International, Gorgonzola (IT)
Bibliographic Reference: EUR 20587 EN (2002), 221pp. Euro: 34.00
Availability: EUR-OP reference: KI-NA-20587-EN-S Available from EUR-OP sales agents URL:
ISBN: ISBN: 92-894-4764-8
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