Method of straightening annular metallic sheets

Details Method of straightening annular metallic sheets Method of straightening annular metallic sheets

B - Operations, Transporting

21

D

B21D 1/00 (2006.01) B21D 3/00 (2006.01) C21D 9/00 (2006.01) C21D 9/46 (2006.01)

Patent

CA 2206108

The present invention provides a method of straightening annular metallic sheets, which comprises the steps of putting a plurality of annular metallic sheets to be straightened each having a convex and a concave sides one on top of the other; sandwiching the annular metallic sheets between stools having flat surfaces; and annealing the plurality of annular metallic sheets via the stools while applying a pressure; wherein at least part of the plurality of annular metallic sheets are piled by bringing a convex side into contact with another convex side and concave side, with another concave side, and the thus piled sheets are pressure-annealed. This reduces the pressing force for straightening, permits easy straightening and gives annular metallic sheets excellent in flatness. An elastic force of a heat resistant spring is utilized for pressing. This ensures a further stable straightening.

La présente invention porte sur une méthode pour redresser des tôles annulaires, laquelle comporte les étapes suivantes: mettre l'une par-dessus l'autre plusieurs tôles annulaires à redresser, chacune ayant un côté convexe et un côté concave, mettre les tôles annulaires en sandwich entre des appuis ayant des surfaces planes; et recuire les tôles annulaires à l'aide des appuis en appliquant une pression; au moins une partie des tôles annulaires sont empilées, un côté convexe étant mis en contact avec un autre côté convexe et un côté concave avec un autre côté concave, et ainsi les tôles empilées sont recuites à pression. Ceci réduit la force de pression nécessaire pour le redressement, permet un redressement facile et donne des tôles annulaires parfaitement planes. La force élastique d'un ressort résistant à la chaleur est utilisée pour exercer la pression. Ceci assure un redressement encore plus stable.

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