Splined clutch hub and method of making same
An externally splined clutch hub and method for making the same is disclosed wherein a flat circular metal preform with a central opening is provided and contacted with a single forging die to simultaneously cold forge a centrally disposed tubular neck extending outwardly from one side of the preform and simultaneously a splined annular ring at the periphery of the preform and extending outwardly from the other side of the preform wherein the tubular neck and the annular ring are coaxial.
1. A method of making an externally splined clutch hub comprising:
providing a flat circular metal preform with a centrally formed opening; and
contacting the preform with a single forging die to simultaneously cold forge a centrally disposed tubular neck extending outwardly from one side of the preform and simultaneously a splined annular ring at the periphery of the preform and extending outwardly from the other side of the preform wherein the tubular neck and the annular ring are coaxial.
2. An apparatus for forming an externally splined clutch hub from cold forging a flat annular preform having a central opening comprising:
a lower die having an upper inner cylindrical wall with an annular array of splines, a lower inner cylindrical wall, and an inter-connecting shoulder for receiving a cooperating punch, and a hollow cylindrical insert for supporting the preform; and
an upper punch for reception within the lower die, said punch including a cylindrical outer wall a portion of which is initially received by the upper inner wall of said lower die for maintaining concentricity of said punch and said lower die prior to and during formation of the preform.
3. An apparatus as defined in claim 2 wherein the insert of said lower die includes an innermost end.
4. An apparatus as defined in claim 3 wherein the innermost end of the insert terminates in a shoulder.
5. An apparatus as defined in claim 2 wherein the upper cylindrical wall of said lower die is of greater diameter then the diameter of the lower cylindrical wall of said lower die.
6. An apparatus as defined in claim 2 wherein said upper punch is caused to be driven into cooperation with said lower die to cause the metal adjacent the periphery of the central opening of the preform to flow in one direction and the metal adjacent the outer periphery of the preform to flow in an opposite direction.
7. An apparatus as defined in claim 6 wherein the metal flow adjacent the central opening forms a tubular neck portion of the hub and the metal flow adjacent the outer periphery forms an annular depending ring.
8. An apparatus as defined in claim 7 wherein the annular depending ring contains an array of parallel spaced apart splines.
9. An apparatus as defined in claim 7 wherein the tubular neck and the annular depending ring are coaxial.