Method and device for producing a steering rack

Abstract

A toothed rack is formed by shaping a rod-shaped blank in a noncutting fashion. For this purpose, two shaping tools are provided, specifically an upper die and a lower die. Negative teeth are provided in the upper die, and in contrast a negative back (that is to say a bed for the back—having a round section—of the toothed rack) is provided in the lower die. Viewed in cross-section through the upper die, the negative teeth extend on both sides as far as into the regions of the lateral burrs which are formed during the shaping process. As a result, the ends of the teeth which are not completely shaped may be removed, together with the lateral burrs, after the shaping process (for example, by milling).

1 - 8 . (canceled)  
   
   
       9 . A method for manufacturing a toothed rack, comprising: 
 shaping a rod-shaped blank in an orbital pressing process in a non-cutting manner by two shaping tools that are pressed against one another, the shaping including: 
 forming teeth of the toothed rack by corresponding negative teeth arranged in a first one of the two shaping tools;  
 forming a back of the toothed rack by a negative back arranged in a second one of the two shaping tools;  
 forming two lateral burrs from excess material between the two shaping tools;  
 pressing material into elongations of the negative teeth to form an enlarged tooth width that extends into regions of the lateral burrs; and  
 lengthening the blank.  
   
   
   
       10 . The method according to  claim 9 , wherein the two shaping tools include an upper die, the negative teeth arranged in the upper die.  
   
   
       11 . The method according to  claim 9 , wherein the two shaping tools include a lower die, the negative back arranged in the lower die.  
   
   
       12 . The method according to  claim 9 , wherein the lateral burrs are formed in the lateral burr forming step by pressing material into recesses arranged in a region of a pressing plane of a lower die of the two shaping tools, the lateral burrs formed in the recesses.  
   
   
       13 . The method according to  claim 9 , wherein the lengthening step includes forming a centering device in a region of at least one of two end faces of the blank.  
   
   
       14 . The method according to  claim 13 , wherein the centering device is an internal centering device.  
   
   
       15 . The method according to  claim 13 , wherein the centering device is an external centering device.