Method and device for procuding a switch cylinder

Abstract

To produce a switch cylinder ( 1 ) with a cam ( 2 ) extending about its periphery, with side flanks ( 3 ) projecting radially, and changing its direction in its run, a tubular piece or a deep-drawn rotational body ( 10 ) made of metal is compressed in axial direction and bulged out along the run of the cam ( 2 ) and the bulged area ( 20 ) is axially compressed by tools ( 5, 6 ) moved axially toward one another and surrounding the adjacent areas of the bulge ( 20 ) on the outside, each of the edges of which having the run of the flanks ( 3 ) of the cam ( 2 ).

1 . Method for the production of a switch cylinder ( 1 ) with a cam ( 2 ) extending about its periphery, with side flanks ( 3 ) projecting radially and changing its direction in its run, characterized in that a tubular piece or a deep-drawn rotational body ( 10 ) made of metal is compressed in an axial direction and bulged out in an area to be bulged along the run of the cam ( 2 ) and that the bulged area ( 20 ) is axially compressed by tools ( 5 ,  6 ) moved axially toward one another and surrounding adjacent areas of the bulge ( 20 ) on an outside, edges ( 51 ,  61 ) of the tools having the run of the flanks ( 3 ) of the cam ( 2 ).  
   
   
       2 . Method according to  claim 1 , characterized in that a first or upper tool ( 5 ) overlaps the tubular piece or body ( 10 ) at one end and surrounds it at its periphery up to the area ( 20 ) to be bulged, a second or lower tool ( 6 ) overlaps the other end of the tubular piece or body ( 10 ) and surrounds an outer periphery found on an other side of the subsequent cam ( 2 ) and the outer surface of the tubular piece or hollow body ( 10 ) and that the surface area to be bulged and formed into the cam ( 2 ) is left free by the two tools ( 5 ,  6 ), and the one tool ( 5  or  6 ) is then moved in a direction toward the other tool ( 5  or  6 ) in an axial direction of the tubular piece or hollow cylinder ( 10 ) or that both tools ( 5 ,  6 ) are moved toward one another in this direction and the tubular piece or hollow cylinder ( 10 ) is compressed and bulged out between the tools ( 5 ,  6 ) and the bulge ( 20 ) is proportionately enlarged to the approach of the tools ( 5 ,  6 ) in a radial direction and reduced in the axial direction.  
   
   
       3 . Method according to  claim 1 , characterized in that the upset bulge ( 20 ) is compressed in such a way that inner sides of the flanks ( 3 ) come into contact.  
   
   
       4 . Method according to  claim 1 , characterized in that the compression of the tubular piece or hollow cylinder ( 10 ) is performed in at least two steps, the tubular piece or hollow cylinder ( 10 ) first being axially shaped and compressed with a first upper and lower tool ( 5 ,  6 ) until the bulge ( 20 ) is formed and it is subsequently placed in a second upper and lower tool ( 5 ,  6 ) and further axially shaped and compressed, in particular until the inner sides of the flanks ( 3 ) of the bulge ( 20 ) of the tubular piece or hollow cylinder ( 10 ) come into contact.  
   
   
       5 . Method according to  claim 1 , characterized in that the tubular piece or hollow cylinder ( 10 ) is stabilized on the inside during shaping by a core tool ( 11 ).  
   
   
       6 . Method according to  claim 1 , characterized in that the shaping of the cam ( 2 ) is radially limited with a side stop ( 9 ).  
   
   
       7 . Method according to  claim 6 , characterized in that the cam ( 2 ) abuts against the side stop ( 9 ) during the axial shaping and, as a result, is radially compressed.  
   
   
       8 . Device for producing a switch cylinder ( 1 ) made of metal from a tubular piece or a deep-drawn rotational body, characterized in that it has at least two tools ( 5 ,  6 ) with cylindrical recesses ( 8 ) for accommodating a tubular or cylindrical workpiece ( 10 ), which can be moved and compressed toward one another in an axial direction after the workpiece ( 10 ) has been inserted and edges ( 51 ,  61 ) of the tools facing one another deviate from a plane of a diameter and extend parallel to one another and are bent to correspond to a radial cam ( 2 ) to be bulged out or formed between the tools.  
   
   
       9 . Device according to  claim 8 , characterized in that the tools ( 5 ,  6 ) each have abutments ( 7 ) on each end of cylindrical hollows thereof facing away from the recess ( 8 ) for the end of the tubular or cylindrical workpiece ( 10 ), an outer diameter of which corresponds to an inside diameter of the cylindrical hollow.  
   
   
       10 . Device according to  claim 8 , characterized in that the edges ( 51 ,  61 ) of the tools facing one another and extending according to the cam ( 2 ) to be shaped each have or leave free a peripherally extending recess ( 8 ) for accommodating a radial bead ( 22 ) to be shaped during compression of the two forms ( 5 ,  6 ).  
   
   
       11 . Device according to  claim 8 , characterized in that a cylindrical core tool ( 11 ) is situated inside the tubular piece or hollow cylinder ( 10 ), the outer diameter of the core tool ( 11 ) corresponding to the inside diameter of the tubular piece or hollow cylinder ( 10 ).  
   
   
       12 . Device according to  claim 8 , characterized in that at least one of the two tools ( 5 ,  6 ) has a radial limit or a side stop ( 9 ) in the axially area left free of the tubular piece or hollow cylinder ( 10 ).  
   
   
       13 . Device according to  claim 8 , characterized in that the radial limit or the side stop ( 9 ) of the cam ( 2 ) extends parallel to the direction of compression of the tubular piece or hollow cylinder ( 10 ) on the tools ( 5 ,  6 ).  
   
   
       14 . Switch cylinder ( 1 ) having a radially projecting cam ( 2 ) extending on its cylindrical surface, consisting of a tubular piece or a deep-drawn cylinder ( 10 ) on which the cam ( 2 ) is formed in one piece by axial compression.  
   
   
       15 . Switch cylinder ( 1 ) according to  claim 14 , characterized in that it has a bottom ( 4 ) on one end connected with it in one piece.  
   
   
       16 . Switch cylinder ( 1 ) according to  claim 14 , characterized in that the bottom ( 4 ) on one end and connected with the switch cylinder ( 1 ) in one piece is penetrated in the centre and is thereby deep-drawn in axial direction in a central area and that this opening serves as a bearing for a shaft extending through the switch cylinder ( 1 ).