Forging method, forged product and forging apparatus

Details Forging method, forged product and forging apparatus Forging method, forged product and forging apparatus

B - Operations, Transporting

21

J

B21J 5/08 (2006.01) B21J 9/06 (2006.01)

Patent

CA 2533994

A forging apparatus 1A includes a swaging apparatus 2 equipped with a fixing die 10, a guide 20 having an insertion passage 22 for inserting and holding a bar-shaped raw material 5 in a buckling preventing state, and a punch 30. The raw material 5 is fixed to the fixing die 10 with the one end portion of the raw material protruded. The one end portion of the raw material 5 is inserted into the insertion passage 22 of the guide 20. Thereafter, while pressing the raw material 5 with the punch 30 in the axial direction, in a state in which an entire peripheral surface of the exposed portion 8 of the raw material 5 exposed between the guide 20 and the fixing die 10 is not restrained, the guide 20 is moved in a directionopposite to the moving direction of the punch 30 so that a length of the exposed portion 8 of the raw material 5 becomes a budding limit length or less at a cross-sectional area of the exposed portion 8 of the raw material 5. Thus, the one end portion of the raw material 5 is subjected to swaging processing.

L'invention porte sur un appareil de forgeage 1A) comprenant une rétreinte (2); une matrice (10) d'étampage; un guide (20) présentant un passage d'insertion (22) permettant d'insérer et de maintenir un matériau brut (5) en barre tout en en empêchant l'écrasement, et un piston (30). Le matériau brut (5) est fixé à la matrice (10) d'étampage par son extrémité saillante, tandis que son autre extrémité est insérée dans le passage d'insertion (22) du guide (20). Dans la phase suivante, lorsque le piston (30) presse le matériau brut (5) dans le sens axial, pour que toute sa partie exposée (8) entre le guide (20) et la matrice (10) d'estampage ne soit plus restreinte, le guide se déplace ensuite dans une direction opposée à celle du piston (30) de manière à ce que la partie exposée (8) du matériau brut (5) constitue la longueur limite d'expansion ou moins au niveau de la section droite de ladite partie exposée (8). L'extrémité non saillante du matériau brut (5) peut alors être écrasée.

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