Method for producing a piston for an internal combustion engine and piston that can be produced by means of said method

Abstract

The present invention relates to a method for producing a piston ( 10 ) from an upper piston part ( 11, 111, 211 ) and a lower piston part ( 15 ). A strip- or plate-shaped semifinished product ( 22 ) made of a metal material is provided, from which an annular upper piston part ( 11, 111, 211 ) or an annular blank ( 25 ) is stamped out, which blank is finished to form an upper piston part ( 11, 111, 211 ), wherein the upper piston part ( 11, 111, 211 ) is connected to a lower piston part ( 15 ) to form a piston ( 10 ).

1 . Method for the production of a piston ( 10 ) for an internal combustion engine, comprising the following method steps:
 (a) making available a strip-shaped or plate-shaped semi-finished product ( 22 ) made of a metallic material,   (b) punching a ring-shaped blank ( 25 ) out of the semi-finished product  22 ,   (c) finishing the blank ( 25 ) to produce an upper piston part ( 11 ,  111 ,  211 ),   (d) connecting the upper piston part ( 11 ,  111 ,  211 ) to a lower piston part ( 15 ), to produce a piston ( 10 ).   
     
     
         2 . Method for the production of a piston ( 10 ) for an internal combustion engine, comprising the following method steps:
 (a) making available a strip-shaped or plate-shaped semi-finished product ( 22 ) made of a metallic material,   (b) finishing at least one surface ( 26 ) of the strip-shaped or plate-shaped semi-finished product ( 22 ),   (c) punching a ring-shaped upper piston part ( 11 ,  111 ,  211 ) out of the semi-finished product ( 22 ),   (d) connecting the upper piston part ( 11 ,  111 ,  211 ) to a lower piston part ( 15 ), to produce a piston ( 10 ).   
     
     
         3 . Method according to  claim 1 , wherein a semi-finished product ( 22 ) made from a steel material is used. 
     
     
         4 . Method according to  claim 3 , wherein a semi-finished product ( 22 ) made from a hot-rolled or cold-rolled steel material is used. 
     
     
         5 . Method according to  claim 1 , wherein the blank ( 25 ) is machined level along at least one surface in step (c). 
     
     
         6 . Method according to  claim 2 , wherein at least one surface ( 26 ) of the semi-finished product ( 22 ) is machined level in step (b). 
     
     
         7 . Method according to  claim 2 , wherein after step (c), the upper piston part ( 11 ,  111 ,  211 ) is finished. 
     
     
         8 . Method according to  claim 1 , wherein a semi-finished product ( 22 ) having a thickness of up to 15 mm is used. 
     
     
         9 . Method according to  claim 1 , wherein during punching, a circumferential lower recess ( 127 ,  227 ) is machined into the blank ( 25 ) or into the upper piston part ( 11 ,  111 ,  211 ). 
     
     
         10 . Method according to  claim 1 , wherein during punching, a least one circumferential lateral recess ( 228 ) is machined into the blank ( 25 ) or into the upper piston part ( 11 ,  111 ,  211 ). 
     
     
         11 . Method according to  claim 10 , wherein the at least one circumferential lateral recess ( 228 ) is formed on the outer or inner circumference of the blank ( 25 ) or of the upper piston part ( 11 ,  111 ,  211 ). 
     
     
         12 . Method according to  claim 1 , wherein the upper piston part ( 11 ,  111 ,  211 ) and the lower piston part ( 15 ) are connected with one another by means of welding or soldering. 
     
     
         13 . Piston ( 10 ) for an internal combustion engine, which can be produced by means of a method according to  claim 1 .