Method and device for the production of a tubular workpiece,...

Details Method and device for the production of a tubular workpiece,... Method and device for the production of a tubular workpiece,...

B - Operations, Transporting

21

K

B21K 21/12 (2006.01) B21J 9/02 (2006.01) B21K 1/10 (2006.01) F16F 9/32 (2006.01)

Patent

CA 2501080

Disclosed is a method for producing a tubular workpiece, particularly a shock absorber piston rod. In a first step of said method, a first partial area (3a) of an original tubular workpiece is initially reduced by means of a radial deformation process so as to decrease the peripheral diameter thereof, and a transition area (3c) that extends diagonal to the longitudinal axis (A) of the original tubular workpiece (3) is formed, said transition area (3c) connecting the first partial area (3a) of the original workpiece, which has a reduced peripheral diameter, to a non-reduced second partial area (3b) that is adjacent to the transition area (3c). In a subsequent second step of the inventive method, the transition area (3c) of the original workpiece (3) is provided with a steep structure by means of a deformation process so as to from the substantially rectangular shoulder (2) of the workpiece (1).

L'invention concerne un procédé permettant de produire une pièce tubulaire, en particulier une tige de piston d'amortisseur. La première étape de ce procédé consiste à réduire une première zone partielle (3a) d'une pièce de départ tubulaire (3) au moyen d'une opération de formage radial pour diminuer les dimensions de son diamètre extérieur, puis à former une zone de transition (3c) qui s'étend transversalement à l'axe longitudinal (A) de la pièce de départ tubulaire (3) et relie la première zone partielle (3a) de la pièce de départ (3) présentant un diamètre extérieur réduit à une deuxième zone partielle (3b) non réduite, adjacente à ladite zone de transition (3c). Selon l'invention, la deuxième étape subséquente dudit procédé consiste à aplatir ladite zone de transition (3c) de la pièce de départ (3) au moyen d'une opération de formage pour conférer à la pièce (1) une épaule (2) présentant une angle sensiblement droit.

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