Method for obtaining face teeth on an inner ring of a wheel hub and associated tool

A shaping tool comprising:

• a plate;
• a shaft extending axially from the plate;
• a rolling bearing connected to the shaft;
• and
• a pressing head mounted on the shaft by means of the rolling bearing, the pressing head comprising a plurality of annular calibration teeth, the plurality of annular calibration teeth comprising:
• a plurality of radial teeth arranged annularly about an axis of symmetry (A) of the shaping tool;
• a plurality of radial concavities alternating annularly with the plurality of radial teeth,
• wherein each of the plurality of radial concavities is delimited by a plurality of bottom walls having a firs rounded circumferential profile.

A method for obtaining a finished face teeth on an inner ring of a wheel hub, the finished face teeth comprising a plurality of finished radial teeth having ridges with a first rounded circumferential profile and a plurality of concavities, the plurality of finished radial teeth alternating with the plurality of finished concavities, the inner ring being provided with an annular collar at a first extremity of the inner ring, the annular collar having a predetermined radial profile, the method comprising:

• forming, on the annular collar, annular roughed-out face teeth, the annular rouged-out face teeth formed coaxial with an axis of symmetry (A) of the annular collar, wherein the axis (A) coincides with an axis of symmetry (B) of the wheel hub, the annular roughed out face teeth comprising:
• a plurality of first radial teeth having ridges and arranged annularly, and
• a plurality of first radial concavities alternating annularly with the plurality of first radial teeth;
• and
• calibrating the annular roughed-out face teeth with a shaping tool, the shaping tool comprising a pressing head having an annular calibration facing teeth, wherein the shaping tool is pressed against the annular roughed-out face teeth of the annular collar with a predetermined axial force (F), engaging the annular calibration facing teeth with the annular roughed-out face teeth to form the finished face teeth,
• wherein the pressing head remains coaxial with the axis (A) when pressed against the annular collar,
• wherein the annular calibration teeth of the pressing head comprise;
• a plurality of second radial teeth arranged annularly;
• and
• alternating annularly with a plurality of second radial concavities, the plurality of second radial concavities delimited by a respective plurality of bottom wall comprising a second rounded circumferential profile that mirrors the first rounded circumferential profile of the ridges of the plurality of finished radial teeth of the finished face teeth,
• wherein the ridges of the plurality of first radial teeth comprise a flat circumferential profile,
• wherein the plurality of first radial concavities comprise a third rounded circumferential profile identical to the first rounded circumferential profile,
• wherein the plurality of annular calibration teeth press against a respective plurality of opposing flanks of the plurality of first radial teeth and cause a metal material of the plurality of annular roughed-out teeth to flow into the plurality of second radial concavities and against the respective plurality of bottom walls,
• wherein the ridges of the plurality of second radial teeth comprise a flat circumferential profile,
• wherein the plurality of second radial teeth comprise an axial height less than an axial height of the plurality of first radial teeth.