Apparatus for manufacturing steering rack bars

B - Operations – Transporting – 21 – K

Patent

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Details

B21K 7/12 (2006.01) B21K 1/76 (2006.01)

Patent

CA 2177834

A forging die for forming a steering rack portion having teeth and two longitudinally extending guide faces from blank. The die comprising first (18) and second (19) die members and four forming elements (52, 53, 54, 55) to converge on the blank. The first forming element (52) being on the second die member (19) for forming the teeth, the second (53) and third (54) forming elements being on the first die member (18) for forming the guide faces. The fourth forming element (55) slidable relative to the first die member (18) for forming a surface of the portion and connected to first bias means (83, 84) allowing movement of the fourth forming element (55) during forging. The die having opposed first and second grippers holding the blank during forging the first gripper (23) connected to a second bias means (25, 36) and slidable relative to said first die member (18) and the second gripper (24) connected to a third bias means (26, 28) and slidable relative to said second die member (19) with the first bias means mechanically separated from the second bias means.

L'invention a pour objet une matrice destinée à former, à partir d'une ébauche, une portion dentée de crémaillère de direction présentant deux surfaces de guidage longitudinales. La matrice comprend une première (18) et une seconde (19) partie ainsi que quatre éléments de formage (52, 53, 54, 55) convergeant sur l'ébauche. Le premier élément (52) est placé sur la seconde partie (19) de la matrice afin de former les dents, tandis que le deuxième (53) et le troisième (54) éléments sont placés sur la première partie (18) de la matrice pour former les surfaces de guidage. Le quatrième élément (55) coulissant par rapport à la première partie (18) de la matrice afin de former une surface de la portion est raccordé à un premier élément de sollicitation (83, 84) autorisant le mouvement du quatrième élément (55) pendant le formage. La matrice possède une première et une seconde pinces face à face qui maintiennent l'ébauche pendant le formage. La première pince (23) est raccordée à un deuxième élément de sollicitation (25, 36) et coulisse par rapport à la première partie (18) de la matrice, tandis que la seconde pince (24) est raccordée à un troisième élément de sollicitation (26, 28) et coulisse par rapport à la seconde partie (19) de la matrice, le premier élément de sollicitation étant mécaniquement séparé du second.

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