Method and apparatus for producing a rotationally symmetric component

Abstract

The present invention relates to a method and an apparatus for producing rotationally symmetric components by means of rolling. For producing a rotationally symmetric component having a profile without any bevels from a blank, the present invention suggests that an annular blank should be deformed into a profiled annular component in a first step by means of rolling between a first inner roll and a first outer roll in a diameter-enlarging mode until the radial growth is limited due to the fact that the profiled annular component comes into contact with at least one additional outer roll. In a second step, the profiled annular component is deformed in a profiling mode between a second inner roll and at least one of said outer rolls on its inner and/or outer circumferential surface(s).

1 . A method of producing a rotationally symmetric component, in particular a synchronizer sleeve for a motor-vehicle gearbox, wherein an annular blank is deformed into a profiled annular component in a first step by means of ring rolling between a first inner roll and a first outer roll in a diameter-enlarging mode until the radial growth is limited due to the fact that the profiled annular component comes into contact with at least one additional outer roll, and wherein in a second step the profiled annular component is deformed in a profiling mode between a second inner roll and at least one of said outer rolls on its inner and/or outer circumferential surface(s).  
     
     
         2 . A method according to  claim 1 , characterized in that, in said second step, the radial growth of the ring is limited by the outer rolls.  
     
     
         3 . A method according to  claim 1  or  2 , characterized in that, in said second step, the first inner roll is used as a second inner roll.  
     
     
         4 . A method according to one of the preceding claims, characterized in that, in said first step, a roll having a cylindrical rolling surface is used for forming a profiled annular component having a cylindrical inner surface.  
     
     
         5 . A method according to one of the preceding claims, characterized in that, between said first step and said second step, the first inner roll is replaced by a second inner roll whose profile is different from that of the first inner roll.  
     
     
         6 . A method according to one of the preceding claims, characterized in that, in said first step, the blank is deformed in a profiling mode on the outer circumferential surface thereof.  
     
     
         7 . A method according to one of the preceding claims, characterized in that, in said second step, the profiled annular component is deformed while maintaining the outer contour comprising the enveloping surface of the profiled annular component.  
     
     
         8 . A method according to one of the preceding claims used for producing a synchronizer sleeve of a gearbox, characterized in that, in said first step, a first groove opening towards the outer circumferential surface is formed and that, in said second step, a second groove opening towards the inner circumferential surface is formed, and that the first groove is reduced in size by the volume displaced in this way.  
     
     
         9 . A method according to one of the preceding claims, characterized in that, in said first step, a first groove is formed, which has a cross-section that broadens in the radial direction and which, in said second step, is deformed into a groove whose lateral surfaces extend substantially at right angles to the central longitudinal axis of the profiled annular component.  
     
     
         10 . An apparatus for producing a rotationally symmetric component, in particular a synchronizer sleeve for a gearbox, by deforming a blank, comprising a plurality of outer profiled rolls and two inner rolls which can selectively be caused to act on the inner side of the component opposite an outer roll, said first inner roll having a flat and said second inner roll a profiled circumferential surface.  
     
     
         11 . An apparatus according to  claim 10 , characterized in that the outer profiled rolls have identically implemented circumferential surfaces.  
     
     
         12 . An apparatus according to  claim 10  or  11 , characterized in that at least one of said outer rolls is movably supported.  
     
     
         13 . An apparatus according to one of the claims  11 - 12 , characterized in that at least one of said outer rolls, preferably a roll which is arranged in a stationary manner, is driven.  
     
     
         14 . An apparatus according to one of the  claims 10  to  13 , characterized by at least one axial roll which is adapted to be advanced towards the end face of said component and a counterroll which is associated with said axial roll.