Device for rolling threads

Abstract

The invention relates to a device for introducing a thread into a workpiece having a cylindrical outer surface by means of thread rolling, comprising a profiling tool ( 7 ) having a profile without pitch, wherein the axis of the profiling tool is at an angle or parallel to the axis of the workpiece, wherein the profiling tool ( 7 ) is formed by a circular disk ( 9 ) rotatably mounted about the axis ( 8 ) of the disk, on the outer edge of which disk two annular, coaxial profiles ( 10 ) without pitch protrude, wherein said profiles form an annular space therebetween that corresponds in shape and dimensions to the thread profile of the thread to be created.

1 . An apparatus for forming a screwthread in a workpiece having a cylindrical outer surface by screwthread rolling, the apparatus comprising a profiling tool with pitchless profile, wherein a rotation axis of the profiling tool is oriented obliquely or parallel to the axis of the workpiece, the profiling tool being a circular disk that is rotatably supported about its rotation axis and that has two annular, coaxial pitchless profiles projecting from an outer periphery of the disk and together defining an annular groove whose shape and dimensions correspond to the screwthread profile of the screwthread to be created. 
     
     
         2 . The apparatus according to  claim 1 , wherein the cylindrical workpiece is held in a part-cylindrical groove of a brace block, a longitudinal axis of the groove being oblique to the rotation axis of the profiling tool. 
     
     
         3 . The apparatus according to  claim 2 , wherein the brace block is adjustable transversely, in particular by hand perpendicular to the rotation axis of the profiling tool. 
     
     
         4 . The apparatus according to  claim 2  wherein the inner wall of the part-cylindrical groove includes a partial screwthread formation that essentially corresponds in shape and pitch to the screwthread to be created. 
     
     
         5 . The apparatus according to  claim 1 , wherein the cylindrical workpiece is supported by at least two rollers that are axially parallel to the workpiece on the side opposite the profiling tool and that rollers are mounted on a brace block. 
     
     
         6 . The apparatus according to  claim 2  wherein the brace block can be actuated by a threaded rod, in particular by hand, in order to adjust a spacing between the profiling tool and the brace block. 
     
     
         7 . The apparatus according to  claim 1 , wherein the workpiece is axially and/or radially insertable into and removable from a space between the profiling tool and the brace block. 
     
     
         8 . The apparatus according to  claim 1 , wherein the apparatus is a hand tool that can be operated by hand and is portable. 
     
     
         9 . An apparatus for forming an external screwthread in a cylindrical outer surface of a workpiece, the apparatus comprising:
 a frame having an inner arm and an outer arm spaced therefrom;   a brace block on one of the arms formed with a part-cylindrical seat generally complementary to the workpiece outer surface and centered on a seat axis;   a profiling disk centered on a rotation axis and having an outer periphery formed relative to the rotation axis with a pair of substantially identical, axially spaced, annular, and radially outwardly projecting ridges defining a radially outwardly open groove of a shape corresponding to a cross section of the external screwthread to be formed in the workpiece surface;   a pivot rotatably supporting the disk on the other of the arms with the disk rotation axis extending nonparallel to the seat axis at a small acute angle corresponding to the pitch of the external screwthread to be formed in the workpiece; and   means for displacing the brace block relative to the one arm toward the disk with a workpiece fitted in the seat such that the ridges engage into and plastically deform the workpiece outer surface and, on rotation of the workpiece relative to the frame, cold-work the external screwthread into the workpiece.