Device and method for the cold-forming profiling of workpieces

Abstract

A method for profiling a profile body by cold forming a workpiece having a longitudinal axis and a cylindrical outer surface extended along the longitudinal axis. The workpiece carries out a rotation movement about the longitudinal axis and is machined by a tool in a multitude of successively executed reshaping engagements. The tool is held by a tool holder, to be rotatable about a tool axis. The tool holder is mounted in an orbiting body to be rotatable about a rotation axis, is driven into a rotation movement about its rotation axis, and is driven into an orbiting movement by the orbiting body. Rotation movement of the workpiece is synchronised with orbiting movement of the tool holder and rotation movement of the tool holder is synchronised with orbiting movement of the tool holder. The tool axis is different from the rotation axis.

1 . A method for manufacturing a profile body which is provided with a profile by way of cold forming a workpiece which comprises a longitudinal axis and, in a machining region, an outer surface, into which the profiling is to be incorporated, wherein the workpiece carries out a rotation movement about the longitudinal axis and is machined by a first tool in a multitude of successively executed reshaping engagements in which the first tool comes into contact with the machining region, wherein the first tool is held by a first tool holder, and wherein the first tool holder:
 is mounted in an orbiting body to be rotatable about a rotation axis of the first tool holder and is driven into a rotation movement about the rotation axis, wherein the term azimuthal which is used hereinafter is defined by the rotation axis; and   is driven into an orbiting movement by the orbiting body; and   
       wherein
 the rotation movement of the workpiece is synchronised with the orbiting movement of the first tool holder; and 
 the rotation movement of the first tool holder is synchronised with the orbiting movement of the first tool holder, and 
 
       wherein the first tool is mounted, in particular freely rotatably mounted, in the first tool holder to be rotatable about a first tool axis which is different from the rotation axis, in particular wherein the first tool axis is spaced from the rotation axis. 
     
     
         2 . The method according to  claim 1 , wherein
 the rotation movement of the workpiece is synchronised with the orbiting movement of the first tool holder such that at each of a number of different positions distributed over a circumference of the workpiece, several of the reshaping engagements take place; and   the rotation movement of the first tool holder is synchronised with the orbiting movement of the first tool holder such that the first tool runs, for each of the reshaping engagements, through the same azimuthal orientations.   
     
     
         3 . The method according to  claim 1 , wherein the orbiting body carries out a rotation about an orbiting body axis, and wherein the orbiting body axis and the rotation axis are aligned parallel to one another. 
     
     
         4 . The method according to  claim 1 , wherein the first tool comprises an active region which is rotationally symmetric with respect to the tool axis, in particular wherein the first tool is embodied as a roller. 
     
     
         5 . The method according to  claim 1 , wherein the rotation movement of the tool holder is synchronised with the orbiting movement of the first tool holder by way of a planetary gear. 
     
     
         6 . The method according to  claim 5 , wherein the planetary gear comprises a ring gear and a planet wheel which runs in the ring gear, wherein the planet wheel is part of the first tool holder and together with the first tool holder executes the rotation movement. 
     
     
         7 . The method according to  claim 1 , wherein the workpiece is simultaneously machined by a second tool in a multitude of successively executed reshaping engagements in which the second tool comes into contact with the workpiece, in particular wherein each of the successively executed reshaping engagements of the second tool takes place at a position of the workpiece which lies opposite that position of the workpiece with respect to the longitudinal axis at which simultaneously a reshaping engagement of the first tool takes place; in particular wherein the first tool and the second tool are embodied as rollers. 
     
     
         8 . The method according to  claim 1 , wherein the workpiece is additionally machined by a further tool in a multitude of successively executed reshaping engagements, in which the further tool comes into contact with the workpiece, in particular wherein a tool holder which holds the further tool carries out the same orbiting movement as the already mentioned tool holder, and wherein this further tool holder is identical to the already mentioned tool holder or is different to this; in particular wherein the first holder and the further tool are embodied as rollers. 
     
     
         9 . The method according to  claim 8 , wherein the further holder is held by the same tool holder as the first tool, in particular wherein the further tool is mounted in the tool holder to be rotatable about a further tool axis which is different from the rotation axis and from the first tool axis, in particular wherein the further tool axis is azimuthally distanced to the first tool axis, and in particular wherein the first and the further tool axis and the rotation axis are aligned perpendicularly to a common plane. 
     
     
         10 . The method according to  claim 8 , wherein a second tool holder is provided, said second tool holder being different from the first tool holder, and by way of the second tool holder the further tool is rotatably held about a further tool axis, wherein the orbiting movements of the first and of the second tool holder describe the same orbiting path, in particular wherein the further tool is mounted in the second tool holder to be rotatable about a further tool axis which is different from a rotation axis of the second tool holder, and in particular wherein the first and the further tool axis and the rotation axis are aligned perpendicularly to a common plane. 
     
     
         11 . A device for manufacturing a profile body which is provided with a profiling by way of cold forming a workpiece, wherein the device comprises:
 a workpiece holder which is rotatable about its longitudinal axis, for holding the workpiece;   a drive device for producing a rotation movement of the workpiece holder about the longitudinal axis;   an orbiting body;   a first tool holder for holding a first tool, wherein the tool holder is mounted in the orbiting body to be rotatable about a rotation axis of the tool holder;   a drive device for producing a rotation movement of the first tool holder about its rotation axis;   a drive device for producing a movement of the orbiting body body, by way of which the first tool holder is drivable into an orbiting movement;   a first synchronisation device for synchronising the rotation movement of the workpiece holder with the orbiting movement of the first tool holder;   a second synchronisation device for synchronising the rotation movement of the first tool holder with the orbiting movement of the first tool holder; and   
       wherein the first tool holder comprises a first rotation bearing for receiving the first tool, said first rotation bearing defining a first tool axis which is different from the rotation axis of the first tool holder, so that the first tool is rotatable, in particular freely rotatable, about the first tool axis. 
     
     
         12 . The device according to  claim 11 , comprising the first tool, mounted in the first rotation bearing to be rotatable about the first tool axis, in particular wherein the first tool tool:
 comprises an active region which is rotationally symmetric with respect to the first tool axis; and/or   is embodied as a roller.   
     
     
         13 . The device according to  claim 11 , wherein the device comprises a drive device for producing a movement of the workpiece holder parallel to the longitudinal axis. 
     
     
         14 . The device according to  claim 11 , comprising a planetary gear which is a constituent of the second synchronisation device and/or a constituent of the drive device for producing a rotation movement of the first tool holder about the rotation axis. 
     
     
         15 . The device according to  claim 11 , wherein the orbiting body is mounted in a profiling head, and wherein the device comprises a drive for a movement of the profiling head towards the longitudinal axis.