Method for fabricating a one-piece metal vehicle wheel

B - Operations – Transporting – 60 – B

Patent

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Details

B60B 3/00 (2006.01) B21D 53/26 (2006.01) B60B 3/02 (2006.01)

Patent

CA 2238267

An improved method for fabricating a vehicle wheel (2) from a one-piece sheet metal blank (10) involves a nine station transfer die. In a first station, a sheet metal blank is drawn into a dish-shaped wall (12), a cylindrical outside wall (14), a first contour (16), and a first side wall (18). In the second station, the dish-shaped wall is reverse drawn to form a hub (22) and an inside wall (10), and a valve hole (24) is punched into the first contour. In the third station, the hub is flattened to be substantially perpendicular to an axial centerline of the partially fabricated wheel, and an outer peripheral edge of the first side wall is trimmed. In the fourth station, the inside wall is laterally formed so as to be in contact with the outside wall, and an outer peripheral edge of the first side wall is wiped over to form a flange. In the fifth station, a second contour is laterally formed. In the sixth station, a first offset and inner and outer hub-stiffening embosses are drawn into the hub. In the seventh station, a second offset is drawn in the hub, and a second side wall is laterally formed to complete a tire engaging rim. In the eighth station a center aperture and a plurality of wheel mounting holes are punched in the hub. Finally, in the ninth station, the center aperture and the wheel mounting holes are extruded, and a plurality of rim-stiffening embosses are laterally formed in the rim.

L'invention porte sur un procédé amélioré de fabrication d'une roue de véhicule à partir d'une ébauche de tôle à l'aide d'une presse de transfert à neuf postes. Les neuf passes correspondantes sont les suivantes: (I) emboutissage de l'ébauche pour former une paroi discoïde (12), une paroi extérieure cylindrique (14), un premier profil (16) et une première paroi latérale (18); (II) contre-emboutissage de la paroi discoïde pour former le moyeu (22), une paroi intérieure (10), et poinçonnage du trou (24) de valve dans le premier profil; (III) aplatissement du moyeu le rendant sensiblement perpendiculaire à l'axe de la roue partiellement formée et ébavurage de la première paroi latérale; (IV) déformation latérale de la paroi intérieure pour la mettre en contact avec la paroi extérieure et courbure du bord périphérique extérieur de la première paroi latérale pour former un raidisseur; (V) formation d'un deuxième profil sur le côté; (VI) création par emboutissage du moyeu d'un premier décrochement et de bossages intérieurs et extérieurs de renfort du moyeu; (VII) emboutissage d'un deuxième décrochement dans le moyeu et formation sur le côté d'une deuxième paroi latérale complétant la jante; (VIII) poinçonnage dans le moyeu d'une ouverture centrale et des trous de montage de la roue; (IX) extrusion de l'ouverture centrale et des trous de montage et formation dans la jante d'une série de bossages latéraux de renfort.

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