Method of forming a tubular ring

Abstract

A method of forming a tubular ring comprising spinning a flat blank having a bore, expanding the bore using a tubular shaft shaped spinning roller by initially engaging the tubular shaft shaped spinning roller with the flat blank bore at an angle (α) to the spinning axis, forming the flat blank into a tubular ring by rotating the tubular shaft shaped spinning roller about a center of rotation (B) such that the tubular shaft shaped spinning roller becomes substantially parallel to the spinning axis, and forming a contour on an outer surface of the tubular ring.

1 . A method of forming a tubular ring comprising:
 spinning a flat blank having a bore;   expanding the bore using a tubular shaft shaped spinning roller by initially engaging the tubular shaft shaped spinning roller with the bore at an angle (α) to the spinning axis;   forming the flat blank into a tubular ring by rotating the tubular shaft shaped spinning roller about a center of rotation (B) such that the tubular shaft shaped spinning roller becomes substantially parallel to the spinning axis; and   forming a contour on an outer surface of the tubular ring.   
   
   
       2 . The method as in  claim 1 , wherein the tubular shaft shaped spinning roller is a line contact tubular shaft shaped spinning roller. 
   
   
       3 . The method as in  claim 1 , wherein the tubular shaft shaped spinning roller is a point contact tubular shaft shaped spinning roller. 
   
   
       4 . The method as in  claim 1 , wherein the tubular shaft shaped spinning roller further comprises a plurality of steps, each step having a different diameter. 
   
   
       5 . The method as in  claim 1  further comprising expanding the bore using a roller having a protruding rim. 
   
   
       6 . The method as in  claim 1  further comprising forming a radially extending portion into a tubular shape.