Piercing and rolling plug, method of regenerating such...

B - Operations – Transporting – 21 – B

Patent

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B21B 25/04 (2006.01) B21B 25/06 (2006.01) C23C 4/02 (2006.01) C23C 4/06 (2006.01) C23C 4/10 (2006.01)

Patent

CA 2701059

A piercing and rolling plug has a film composed of oxides such as Fe3O4 and FeO and Fe (metal) as being formed on the surface of the base metal by electric arc spraying using an iron wire whose main component is Fe and, owing to this film, a plug excellent in heat-shielding and seizure-preventing effects can be realized and the lifetime of the plug can be prolonged. Further, in regenerating this plug, a film can be re-formed via the steps of shot blasting of the as-used plug in piercing and rolling and electric arc spraying in that order; thus, it is possible to regenerate the plug at low cost and in a short period of time.

Etant donné qu'un film de revêtement composé d'un oxyde tel que Fe3O4 ou FeO et de Fe (métal) est formé sur la surface d'un matériau de base par la projection à l'arc électrique d'un fil de fer comprenant principalement du Fe, un poinçon de perforation peut obtenir d'excellentes propriétés de protection thermique et propriétés de protection contre le grippage grâce à ce film de revêtement, et le poinçon peut avoir une longue durée de vie. Lorsque le poinçon est régénéré, un film de revêtement peut être à nouveau formé par la réalisation séquentielle de grenaillage et de projection à l'arc sur un poinçon venant d'être perforé, et ainsi le poinçon peut être régénéré en peu de temps à faible coût.

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