Method of producing bladed components, blanks for bladed components, and use of the blanks

Abstract

Bladed components for fluid-flow machines produced from a forged blank in which provision is made for the blank to be forged to near-net shape, in particular during drop forging, and in which intermediate spaces between adjacent blades are to be produced, at least for the most part, resulting in the cutting cost for forming the bladed component from the blank being markedly reduced, which leads to lower manufacturing costs of the bladed component.

What is claimed is:  
     
         1 . Method of producing bladed components in particular for fluid-flow machines, a blank being produced by forging and the blank subsequently being machined, characterized in that the blank is forged to near-net shape.  
     
     
         2 . Method according to  claim 1 , characterized in that the blank is forged to near-net shape in such a way that essentially only the forging allowance has to be machined.  
     
     
         3 . Method according to  claim 2 , characterized in that intermediate spaces are at least partly produced between at least some blades in the blank during the forging.  
     
     
         4 . Method of producing blanks for bladed components, in particular of fluid-flow machines, the blank being forged from a forgeable material, characterized in that the blank is drop-forged to near-net shape.  
     
     
         5 . Method according to  claim 4 , characterized in that the blank, during the drop forging, is provided with an outer contour that at least partly corresponds to the contour of the finished component plus the forging allowance.  
     
     
         6 . Method according to  claim 4 , characterized in that at least some of the blades are forged with a forging allowance during the drop forging.  
     
     
         7 . Method according to  claim 4 , characterized in that intermediate spaces are formed at least partly between at least some blades during the drop forging.  
     
     
         8 . Method according  claim 4 , characterized in that the blank is provided with at least one undercut during the drop forging.  
     
     
         9 . Method according to  claim 4 , characterized in that at least partly undercut intermediate spaces are produced between at least some adjacent blades during the drop forging.  
     
     
         10 . Method according  claim 4 , characterized in that the at least one undercut is produced by rotating at least one part of the die.  
     
     
         11 . Method according to  claim 4 , characterized in that the at least one undercut is produced by rotating only one die half.  
     
     
         12 . Method according to  claim 11 , characterized in that, to produce the undercuts, one die half is rotated about an axis running in the pressing direction.  
     
     
         13 . Method according to  claim 10 , characterized in that, to produce the at least one undercut, both die halves are rotated relative to one another about an axis running in the pressing direction.  
     
     
         14 . Application of forged parts, produced by drop forging at least partly to near-net shape, as blanks to be machined for blades, propellers or bladed rollers, guide wheels or guide rings of fluid-flow machines.  
     
     
         15 . Application of forged parts, produced by drop forging to at least partially near-net shape, as blanks to be machined for bladed components of turbines, compressors, turbochargers or pumps.  
     
     
         16 . Die for forging blanks for bladed components, with a die that has at least a bottom die and a top die, at least the top die being movable in the pressing direction towards the bottom die, characterized in that at least parts of the die can be rotated about an axis running in the pressing direction.  
     
     
         17 . Die according to  claim 16 , characterized in that the top die can be rotated about a longitudinal center axis running in the pressing direction.  
     
     
         18 . Die according to  claim 16 , characterized in that the top die can be rotated about the longitudinal center axis when the die is closed.  
     
     
         19 . Die according to  claim 16 , characterized in that the top die and the bottom die can be rotated in opposite directions.  
     
     
         20 . Die according to  claim 19 , characterized in that the top die and the bottom die can be rotated in opposite directions about a common longitudinal center axis.