Flow-forming machine and forming method for producing a wheel

Abstract

The invention relates to a flow-forming machine and a forming method for producing a wheel having a rim from a workpiece, with a spinning mandrel, the outside of which is configured for forming the rim, a counter-mandrel, wherein the workpiece is clamped on the spinning mandrel or the counter-mandrel, a rotary drive and at least one compression roller, which can be advanced against the workpiece for forming the rim. According to the invention, it is provided that the spinning mandrel has a sleeve-like perimeter element, which can be displaced axially during forming. A controller is provided, by means of which, while the rim is being formed, the at least one compression roller and the perimeter element of the spinning mandrel can be displaced axially relative to the workpiece in a coordinated manner.

1 . A flow-forming machine for producing a wheel, in particular a vehicle wheel, having a rim, from a workpiece, comprising
 a spinning mandrel, the outside of which is configured for forming the rim,   a counter-mandrel, which can be displaced axially relative to the spinning mandrel, wherein the workpiece is clamped on the spinning mandrel and/or the counter-mandrel,   a rotary drive for the rotational driving of spinning mandrel and counter-mandrel with the clamped workpiece and   at least one compression roller, which can be advanced against the workpiece axially and radially for forming the rim,   wherein   the spinning mandrel has a sleeve-like perimeter element, which can be displaced axially to the workpiece during forming,   the spinning mandrel has a main support, on which the perimeter element is mounted in an axially slideable manner,   on a free front side of the main support a front element is arranged, wherein a radial hub or a drop center can be clamped axially between the spinning mandrel with the front element and the counter-mandrel, and   a controller is provided, by means of which, while the rim is being formed, the at least one compression roller and the perimeter element of the spinning mandrel can be displaced axially relative to the workpiece in a coordinated manner.   
     
     
         2 . The flow-forming machine according to  claim 1 ,
 wherein   the sleeve-like perimeter element is configured in a conical shape at least in part, wherein the perimeter element tapers towards a free end.   
     
     
         3 . The flow-forming machine according to  claim 1 ,
 wherein   in a region of the perimeter element, a forming region is arranged,   which is configured for forming a rim flange on the rim.   
     
     
         4 . The flow-forming machine according to  claim 2 ,
 wherein   for forming an axial undercut region on the rim the controller is configured for the relative axial displacement of the at least one compression roller and the perimeter element, so that the at least one compression roller initially engages on a first diameter region of the conical perimeter element, next engages on a second diameter region of the perimeter element, which is smaller than the first diameter region, and then engages on a third diameter region of the perimeter element, which is larger than the second diameter region.   
     
     
         5 . The flow-forming machine according to  claim 3 ,
 wherein   for the axial sliding of the perimeter element on the main support at least one adjusting element, in particular an adjusting cylinder or a spindle drive, is provided.   
     
     
         6 . The flow-forming machine according to  claim 3 ,
 wherein   the front element is fitted on the main support in such a way that it can be replaced.   
     
     
         7 . A forming method for producing a wheel, in particular a vehicle wheel, having a rim, from a workpiece, in which
 the workpiece is clamped on a spinning mandrel, the outside of which is configured for forming the rim, and/or a counter-mandrel,   the clamped workpiece is set in rotation by a rotary drive and   at least one compression roller is advanced against the rotating workpiece axially and radially, wherein the rim is formed,   wherein   the spinning mandrel has a sleeve-like perimeter element,   which is displaced axially while the rim is being formed,   the spinning mandrel has a main support, on which the perimeter element is slid axially,   on a free front side of the main support a front element is arranged, wherein a radial hub or a drop center of the workpiece is axially clamped between the spinning mandrel with the front element and the counter-mandrel, and   while the rim is being formed, the at least one compression roller and the perimeter element of the spinning mandrel are displaced axially relative to the workpiece in a coordinated manner.   
     
     
         8 . The forming method according to  claim 7 ,
 wherein   multiple compression rollers are advanced against the workpiece in an even distribution around the perimeter of the workpiece and with an axial offset relative to each other.   
     
     
         9 . The forming method according to  claim 7 ,
 wherein   while the rim is being formed, the at least one compression roller and the perimeter element are axially displaced differently.   
     
     
         10 . The forming method according to  claim 7 ,
 wherein   for forming an axial undercut region on the rim the at least one compression roller initially engages on a first diameter region of the conical perimeter element, next the at least one compression roller engages on a second diameter region of the perimeter element, which is smaller than the first diameter region, and then the at least one compression roller engages on a third diameter region of the perimeter element, which is larger than the second diameter region.   
     
     
         11 . The forming method according to  claim 7 ,
 wherein   a perimeter element is used, the axial length of which is smaller than the rim that is to be formed, and   with the perimeter element, wheels with different axial lengths of the rim are formed.   
     
     
         12 . The forming method according to  claim 7 ,
 wherein   during forming the workpiece is set in rotation about a vertical axis of rotation.