Method for the production of axially symmetrical workpieces with or without a toothed profile

Abstract

The method according to the invention for producing substantially axially symmetrical workpieces by shaping a starting material uses a die and a rotatable tool, the die being provided with a bore along the central axis thereof. Here the starting material is introduced through the bore of the die and pressed in between the die and the rotating tool such that the starting material flows outward from the central axis according to the contour of the die. The workpiece is thus produced in a single operation. Depending on the requirements for the dimensional accuracy and surface quality, mechanical finishing or calibrations are possible. Due to the material flow in the die and the rotation of the tool, shaping forces which are only small in comparison to conventional methods occur here, and so the requirements made of the tools, and so the expense, are reduced. Since the shaping takes place without cutting, the resulting fibre flow of the finished workpiece is also advantageous and provides the workpiece with better mechanical properties.

1 . A method for producing substantially axially symmetrical workpieces by shaping a starting material ( 3 ) with the aid of a die ( 1 ) and a rotatable tool ( 2 ), the die being provided with a bore ( 11 ) along the central axis thereof, and which comprises the following steps:
 introducing the starting material through the bore of the die;   pressing the starting material in between the die and the rotating tool such that the starting material flows outward from the central axis according to the contour ( 12 ) of the die.   
   
   
       2 . The method according to  claim 1 , the starting material being introduced continuously and in a controlled manner. 
   
   
       3 . The method according to  claim 1  or  2 , the die being mounted in a fixed position. 
   
   
       4 . The method according to  claim 1  or  2 , the die being mounted rotatably about a rotation axis. 
   
   
       5 . The method according to  claim 4 , the rotation speed of the die being controlled independently of the rotation speed of the tool. 
   
   
       6 . The method according to  claim 4 , the die running freely with the rotating tool. 
   
   
       7 . The method according to any of the preceding claims, the rotation speed n of the tool and/or the distance a between the tool and the die being set during shaping. 
   
   
       8 . The method according to any of the preceding claims, it being possible to offset the rotation axis of the tool in relation to the central axis of the die with an excentricity e. 
   
   
       9 . The method according to  claim 8 , the level of excentricity being set by the rotating tool being rotated, oscillating, about the central axis of the die. 
   
   
       10 . The method according to any of the preceding claims, the die having a preferably profiled edge ( 13 ). 
   
   
       11 . The method according to any of the preceding claims, the starting material being heating up during the step of introducing or pressing in. 
   
   
       12 . The method according to any of the preceding claims, the starting material being introduced in solid or tubular form. 
   
   
       13 . The method according to any of the preceding claims, the tool having a symmetrical or asymmetrical tool contour. 
   
   
       14 . A workpiece produced with the method according to any of  claims 1  to  13 , characterised in that it has continuous and non-interrupted fibres substantially parallel to the integrally moulded surface contours.