Expansion tool for cold expansion of holes

Details Expansion tool for cold expansion of holes Expansion tool for cold expansion of holes

B - Operations, Transporting

23

P

B23P 9/02 (2006.01)

Patent

CA 2649560

A tool (10) for cold expansion of holes comprises a body (14) which has at least a cylindrically shaped part (16) having an inner hole (24) in axial direction of the body (14). The body (14) comprises along the circumferential direction a plurality of members (18, 18a, 18b, 18c) which are movable in radial direction of the body (14), such that the outer diameter of the cylindrically shaped part (16) of the body (14) can be changed. Furthermore a core (26, 26c) is provided which is insertable into the inner hole (24), wherein at least one of the core (26, 26c) and the inner hole (24) comprises a portion (28) of changing diameter and the inner hole (24) and the core (26, 26c) get into contact with each other upon insertion of the core, such that in dependency of the depth of the insertion of the core (26, 26c) into the inner hole (24) in axial direction the members (18, 18a, 18b, 18c) move radially outwardly and the outer diameter of the cylindrically shaped part (16) of the body (14) increases.

L'invention concerne un outil (10) pour l'expansion à froid de trous, lequel présente un corps (14) qui présente au moins une partie cylindrique (16) ayant un trou intérieur (24) dans la direction axiale du corps (14). Le corps (14) comprend, le long de la direction circonférentielle, une multitude de membres (18, 18a, 18b, 18c), lesquels sont mobiles dans la direction axiale du corps (14), de telle sorte que le diamètre extérieur de la partie cylindrique (16) du corps (14) peut être changé. En outre, un noyau (26, 26c) est fourni qui est insérable dans le trou intérieur (24), où au moins un des noyaux (26, 26c) et le trou intérieur (24) comprennent une partie (28) à diamètre changeant et le trou intérieur (24) et le noyau (26, 26c) entrent en contact l'un avec l'autre lors de l'insertion du noyau, de sorte que, en fonction de la profondeur d'insertion du noyau (26, 26c) dans le trou intérieur (24) en direction axiale, les membres (18, 18a, 18b, 18c) se déplacent radialement vers l'extérieur et le diamètre extérieur de la partie cylindrique (16) du corps (14) augmente.

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