Method and apparatus for manufacturing packets composed of...

H - Electricity – 01 – F

Patent

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H01F 41/02 (2006.01) H01F 27/245 (2006.01)

Patent

CA 2303898

The present invention offers a manufacturing method that also makes sheet metal packets in what is referred to as the punch-packeting technology available that comprise a round or oval iron cross section. Lamellae are thereby punched from a tape and are provided with depressions at one side and with elevations at the other side that coincide with the depressions and lie opposite them, whereby the elevations in the form of at least two circular nipples are pressed into the depressions upon assembly of each packet. In one lamella per packet, this serving as separating lamella, cylindrical holes are punched instead of the depressions, the nipples of the neighboring lamella engaging into said holes. Lamellae are thereby punched from the tape that exhibit a different outside contour, particularly a different width, and are joined with one another to form a packet that at least partially comprises a round iron cross section. The sheet metal packet comprises graduated edges.

L'invention concerne un procédé de fabrication permettant d'obtenir, suivant une méthode dite d'assemblage de paquets par estampage, des paquets de tôles à section du fer circulaire ou ovale. A cet effet, des lames sont estampées à partir d'une bande et sont munies d'un côté, d'évidements et, de l'autre côté, de bossages coopérant avec les évidements et opposés à ceux-ci, les bossages étant compressés dans les évidements sous forme d'au moins deux boutons circulaires, lors de l'assemblage de chaque paquet. Pour une lame par paquet, servant de lame de séparation, on perce, à la place des évidements, des trous cylindriques dans lesquels s'engagent les boutons des lames voisines. L'invention est caractérisée en ce qu'à partir de la bande, on estampe des lames présentant des profils extérieurs différents, en particulier des largeurs différentes, et en ce qu'on relie ces lames entre elles de manière à former un paquet présentant au moins partiellement une section de fer circulaire. Le paquet de tôles présente des bords étagés.

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