Method for making disc flange as formed in situ in a wheel rim

Abstract

A method for making a disc flange in a wheel rim including the steps of: A. Forming a cylinder for a wheel rim; B. Forming an annular groove concaved inwardly centripetally from a cylindrical wall of the cylinder towards an axis of the wheel rim; C. Pressing the annular groove to be an annular flattened disc flange circumferentially formed in an inside wall of the cylinder; and D. Circumferentially welding along an outer port of the flattened flange as pressed and derived from the annular groove for sealing an interior in the flattened flange; whereby upon surface treatment of the wheel rim and forming of bolt holes through the disc flange, a wheel disc can be secured to the disc flange in the wheel rim by fastening bolts through the bolt holes formed in the disc flange and in the wheel disc.

1 . A method for forming at least a disc flange in situ in a wheel rim comprising the steps of: 
 A. Forming a cylinder of a wheel rim;    B. Forming an annular groove by inwardly centripetally concaving an outer cylindrical wall of said cylinder of the wheel rim towards an axis of the cylinder of the wheel rim;    C. Pressing the annular groove to be a flattened flange;    D. Forming an annular welding ring along an outer port of said flattened flange as derived from said annular groove for sealing the outer port of said flange; 
 whereby upon forming of a plurality of bolt holes through said disc flange, a wheel disc will be secured on said disc flange by fastening a plurality of bolts through said bolt holes formed through said disc flange and formed through the wheel disc.  
   
   
   
       2 . A method according to  claim 1 , wherein said cylinder of said wheel rim is made by extrusion process.  
   
   
       3 . A method according to  claim 1 , wherein said cylinder of said wheel rim is formed by forming a cylindrical container by a deep drawing process and then said cylindrical container is cut off a bottom portion thereof to form said cylinder of the wheel rim.  
   
   
       4 . A method according to  claim 1 , wherein said annular groove is formed by a rolling process by rolling the outer cylindrical wall of the cylinder of wheel rim inwardly centripetally towards the axis of said cylinder.  
   
   
       5 . A method according to  claim 1 , wherein said annular groove has its longitudinal section formed as a V shape or U shape as flared outwardly from the axis of said cylinder of wheel rim.  
   
   
       6 . A method according to  claim 1 , wherein said outer port in said disc flange as derived from said annular groove is sealed by a sealing element.  
   
   
       7 . A method according to  claim 1 , wherein said outer port in said flange of said wheel rim is embedded therein a reinforcing band.  
   
   
       8 . A method according to  claim 1 , wherein said wheel rim is made of aluminum alloy.  
   
   
       9 . A method according to  claim 7 , wherein said reinforcing band is made of aluminum alloy.  
   
   
       10 . A method according to  claim 7 , wherein at least an annular welding ring is formed by welding along an annular cavity among said reinforcing band, said flange and a cylindrical wall of said wheel rim.