Expanding tool for cold forming

B - Operations – Transporting – 21 – D

Patent

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Details

B21D 41/02 (2006.01)

Patent

CA 2211897

The expanding tool has a cylindrical expanding mandrel (5) consisting of a plurality of cylinder-sector expanding components (10) which are interchangeably secured and guided on a face of a housing (1). The expanding mandrel (5) has a partially conical inner drilling (6) with which engages an expanding cone (4) operating together with actuating means (2) which advance the expanding cone (4) into the inner drilling (6) of the expanding mandrel (5) to expand the end (19) of a pipe fitted on said mandrel (5). In addition, the expanding mandrel (5) is bevelled (9) at its free end. Between the bevel (9) and a thickening (11) from which the holding component proceeds there is at least one recess (18) running around the entire periphery of the expanding mandrel (5).

La présente invention concerne un outil expansible comportant un mandrin expansible (5) cylindrique constitué par plusieurs éléments expansibles en forme de segments cylindriques (10) qui sont fixés et guidés, avec un élément de fixation, sur une face d'une enveloppe (1), de façon à pouvoir être remplacés. Le mandrin expansible (5) comporte un trou intérieur (6) en partie conique, dans lequel s'engage un cône expansible (4) qui agit en combinaison avec des organes d'actionnement (2). Ceux-ci font avancer le cône expansible (4) dans le trou intérieur (6) du mandrin expansible (5) pour élargir l'extrémité (19) d'un tube placé sur le mandrin expansible (5). En outre, à son extrémité libre, le mandrin expansible (5) présente un chanfrein (9). Au moins un renfoncement (18) s'étendant sur tout le périmètre du mandrin expansible (5) est situé entre ce chanfrein (9) et une partie épaissie (11) d'où part l'élément de fixation.

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