An alloy for cladding cast iron is disclosed. The alloy may include on a weight basis, about 6.2% to about 9.3% of chromium (Cr), about 3.0% to about 4.5% of iron (Fe), about 1.4% to about 2.15% of silicon (Si), about 0.5% to about 0.8% of boron (B), about 0.1% of carbon (C), and a balance of nickel (Ni) and incidental impurities.

An alloy for cladding cast iron is disclosed. The alloy may include on a weight basis, about 6.2% to about 9.3% of chromium (Cr), about 3.0% to about 4.5% of iron (Fe), about 1.4% to about 2.15% of silicon (Si), about 0.5% to about 0.8% of boron (B), about 0.1% of carbon (C), and a balance of nickel (Ni) and incidental impurities.

Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines 21. When a swing center distance is taken to be L, a swing angle that is the inclination angle of the center axis of a roll 30 with respect to a main hub body 8 is taken to be , the pitch diameter of the hub-side face splines 21 is taken to be D.sub.h, the number of teeth of the hub-side face splines 21 is taken to be N.sub.h, and the number of teeth of a processing surface 31 of the roll 30 is taken to be N.sub.r, the position relationship of the main hub body 8 and the roll 30, or in other words, at least one of the swing center distance L, the swing angle , and the pitch circle diameter D.sub.h is regulated so that the relationship Nh/Nr=cos +(2L/D.sub.h).Math.sin is satisfied.

Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines 21. When a swing center distance is taken to be L, a swing angle that is the inclination angle of the center axis of a roll 30 with respect to a main hub body 8 is taken to be , the pitch diameter of the hub-side face splines 21 is taken to be D.sub.h, the number of teeth of the hub-side face splines 21 is taken to be N.sub.h, and the number of teeth of a processing surface 31 of the roll 30 is taken to be N.sub.r, the position relationship of the main hub body 8 and the roll 30, or in other words, at least one of the swing center distance L, the swing angle , and the pitch circle diameter D.sub.h is regulated so that the relationship Nh/Nr=cos +(2L/D.sub.h).Math.sin is satisfied.

A method and tool for obtaining face teeth having a plurality of radial teeth on an annular collar of an inner ring of a wheel hub; in which annular roughed-out face teeth are first formed on the collar coaxial with an axis of symmetry (A) of the collar and having a plurality of radial first teeth arranged in a crown and alternating at constant pitch with a plurality of radial first concavities; then a shaping tool comprising a pressing head provided with annular calibration face teeth is axially pressed onto the collar to engage with the annular roughed-out face teeth, second radial concavities of the annular calibration teeth each being delimited by a bottom wall having a rounded circumferential profile exactly reproducing in negative the rounded circumferential profile of the tips or ridges of the radial teeth of the required face teeth.

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).

Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines 21. When a swing center distance is taken to be L, a swing angle that is the inclination angle of the center axis of a roll 30 with respect to a main hub body 8 is taken to be , the pitch diameter of the hub-side face splines 21 is taken to be D.sub.h, the number of teeth of the hub-side face splines 21 is taken to be N.sub.h, and the number of teeth of a processing surface 31 of the roll 30 is taken to be N.sub.r, the position relationship of the main hub body 8 and the roll 30, or in other words, at least one of the swing center distance L, the swing angle , and the pitch circle diameter D.sub.h is regulated so that the relationship Nh/Nr=cos +(2L/D.sub.h).Math.sin is satisfied.

Construction is achieved that is capable of preventing the formation of radial streaks in the tip-end surfaces of teeth of hub-side face splines 21. When a swing center distance is taken to be L, a swing angle that is the inclination angle of the center axis of a roll 30 with respect to a main hub body 8 is taken to be , the pitch diameter of the hub-side face splines 21 is taken to be D.sub.h, the number of teeth of the hub-side face splines 21 is taken to be N.sub.h, and the number of teeth of a processing surface 31 of the roll 30 is taken to be N.sub.r, the position relationship of the main hub body 8 and the roll 30, or in other words, at least one of the swing center distance L, the swing angle , and the pitch circle diameter D.sub.h is regulated so that the relationship Nh/Nr=cos +(2L/D.sub.h).Math.sin is satisfied.

A method for manufacturing a vehicle bearing apparatus includes a method for manufacturing a hub ring. The hub ring includes a seal facing surface, a flange portion, and a shaft body portion. The flange portion includes a thin portion, a thick portion, bolt holes, a thin portion outer surface, a thick portion outer surface, and bolts. The flange portion protrudes outward from the shaft body portion. The thick portion is formed on an outer side with respect to the bolt holes in the flange portion, and the thin portion is formed on an inner side with respect to the thick portion in the flange portion. In the method for manufacturing the hub ring, machining is performed on the thick portion outer surface by using the seal facing surface subjected to grinding, as a reference surface, after the bolts are fitted into the flange portion.

A method for manufacturing a vehicle bearing apparatus includes a method for manufacturing a hub ring. The hub ring includes a seal facing surface, a flange portion, and a shaft body portion. The flange portion includes a thin portion, a thick portion, bolt holes, a thin portion outer surface, a thick portion outer surface, and bolts. The flange portion protrudes outward from the shaft body portion. The thick portion is formed on an outer side with respect to the bolt holes in the flange portion, and the thin portion is formed on an inner side with respect to the thick portion in the flange portion. In the method for manufacturing the hub ring, machining is performed on the thick portion outer surface by using the seal facing surface subjected to grinding, as a reference surface, after the bolts are fitted into the flange portion.