Method for forging a metallic workpiece

Abstract

During the forging of a metallic workpiece (W) with at least four forging tools ( 1, 2 ) which are mutually opposite in pairs and are mutually angularly offset about the forging axis (S), the workpiece (W) is deformed under prevention of any lateral flow during each forging stroke by the deforming forging tools ( 1, 2 ) which enclose the workpiece cross section and is subjected to a hydrostatic pressure all over. In order to achieve in addition to the favorable dense forging due to the hydrostatic pressure Iall over a kneading effect for the desired improvement of the structure, the workpiece (W), prior to the final enclosure of the workpiece cross section and the consequent deformation obstructing the lateral flows is deformed during each forging stroke by an uneven deformation effect of the mutually angularly offset pairs of forging tools ( 1, 2 ) in addition with an at least reduced obstruction to lateral flow.

1 . A method for forging a metallic workpiece with at least four forging tools which are mutually opposite in pairs and are mutually angularly offset about the forging axis, according to which the workpiece is deformed under prevention of any lateral flow during each forging stroke by the simultaneously deforming forging tools which enclose the workpiece cross section and is subjected to a hydrostatic pressure all over, wherein the workpiece, prior to the final enclosure of the workpiece cross section and the consequent deformation obstructing the lateral flow, is deformed during each forging stroke by an uneven deformation effect of the mutually angularly offset pairs of forging tools in addition with an at least reduced obstruction to lateral flow.  
     
     
         2 . A method as claimed in  claim 1 , wherein the uneven deformation effect of the mutually angularly offset pairs of forging tools is achieved by using forging tools with differently shaped impact surfaces which converge into the same end cross section,  
     
     
         3 . A method as claimed in  claim 1  or  2 , wherein the mutually angularly offset pairs of forging tools are stroke-moved with a different stroke height from the same lower dead center position.  
     
     
         4 . A method as claimed in  claim 1  or  2 , wherein the mutually angularly offset pairs of forging tools are subjected to a different stroke movement which can each be triggered per se.