Abstract:
Rotary forging for forming a hub-side face spline is started in a state in which a caulking section is made to come in contact with a flat surface section that is an inner end surface of an inner ring in an axial direction and a chamfer. In addition, a contact portion between an inner end surface of the caulking section in the axial direction and a processing surface of a roll at the beginning of the rotary forging overlaps a contact portion between the caulking section and the flat surface section and the chamfer of the inner ring in the axial direction.
Abstract:
A rotary press device (33) includes a restriction section (36) configured to restrict a motion of a roll (30) around a central axis of a roll (30) against movement of the roll (30) around a central axis of a hub main body (8) during rotary forging. In an example, the restriction section (36) has guide teeth (44) meshed with teeth formed on a processing surface of the roll (30).
Abstract:
A method of manufacturing a metal core for a resin gear is provided. The metal core has a boss portion into which a shaft is press-fitted and a ring portion to which an outer peripheral resin is joined. The method includes swaging a plate material having a center hole by pressing the plate material in an axial direction to form a swaged body, and forging the swaged body by pressing the swaged body in the axial direction under a higher pressure. The swaging includes deforming a portion around the center hole in the axial direction to form an inner circumferential swaged portion, and deforming an outer circumferential portion of the plate material in the same axial direction to form an outer circumferential swaged portion. The forging includes forming the inner circumferential swaged portion into the boss portion, and forming the outer circumferential swaged portion into the ring portion.
Abstract:
A raceway member 6 of a wheel support hub unit, having wheel or vehicle body fixing portions 7 extending radially outward from a solid or hollow shaft portion, and a wheel or vehicle body positioning cylindrical portion 9 extending concentrically with the shaft portion, the fixing portion 7 being formed by the cold side extrusion so that the fixing portion is integral with the shaft portion 5.
Abstract:
A method is directed to a production of a bearing device for a wheel including an inner member and an outer member rotatable relative to each other through a plurality of rolling elements, in which a component part forming one of the inner member and the outer member is a hot forged product. In the practice of this method, during or at the end of a hot forging step for hot forging the component part, a portion of the component part is cooled by spraying a coolant or by controlling an atmospheric temperature, to thereby render a matrix of the component part to represent a standard structure and render a surface portion of the component part to represent a non-standard structure.
Abstract:
According to a method of manufacturing a flanged shaft member having a plurality of flanges used to fasten the shaft member to a wheel, when the flanges are formed on a part between a shaft portion and a fitting shaft portion through lateral extrusion while a forged recess is formed at a center of an end surface of the fitting shaft portion with the use of a forging die apparatus for cold forging, each flange is formed so as to be curved in a direction opposite to a direction, in which the flange warps due to springback caused after the lateral extrusion, by an amount corresponding to an amount of warpage due to the springback.
Abstract:
A wheel bearing device of the invention includes a flanged shaft member that includes a shaft portion to which a rolling bearing is assembled, a fitting shaft portion that is formed on one end side of the shaft portion and that is fitted to a center hole of a wheel, and a plurality of flange portions that extend radially outward on an outer peripheral surface located between the shaft portion and the fitting shaft portion and each of which has a bolt hole in which a hub bolt for fastening the wheel is arranged. Each flange portion is formed by side extrusion when a forged recess is formed at a center of an end surface of the fitting shaft portion by cold forging.
Abstract:
There is provided a bearing unit including one raceway ring 2 which is mounted on a vehicle body, the other raceway ring 4 which is disposed to face the one raceway ring 2 and is mounted on a wheel, and a plurality of rolling elements 6, 8 which are built in rollably between an outer ring raceway 2s and an inner ring raceway 4s which are formed continuously on facing surfaces of both the raceway rings 2, 4, respectively, along a circumferential direction, at least either of the raceway rings 2, 4 having a connecting flange 12a or a mounting flange 12a at which the raceway ring is mounted on the vehicle body or the wheel, wherein both the raceway rings 2, 4 are formed entirely through cold forging with no machining given to a surface of the flange 2a, 12a, while a quenching and tempering treatment by electromagnetic induction and grinding are given to at least the outer ring raceway 2s and the outer ring raceway 4s.
Abstract:
A method of manufacturing an irregularly shaped forging includes heating a billet to a predetermined temperature, placing the heated billet within the cavity of a die, advancing a punch into the cavity to begin to disperse the material into a plurality of radially extending extremities of the cavity and continuing to advance the punch into the die to force a portion of the material to enter predetermined clearance zones between the punch and the die to form an irregularly shaped forging having a plurality of axially extending flash portions.
Abstract:
A method of manufacturing an irregularly shaped forging includes heating a billet to a predetermined temperature, placing the heated billet within the cavity of a die, advancing a punch into the cavity to begin to disperse the material into a plurality of radially extending extremities of the cavity and continuing to advance the punch into the die to force a portion of the material to enter predetermined clearance zones between the punch and the die to form an irregularly shaped forging having a plurality of axially extending flash portions.