US2007102074A1PendingUtilityA1

Method for heat treating cast parts produced from a light metal melt, in particular an aluminium melt

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Individually held — no corporate assignee on recordPriority: Mar 24, 2004Filed: Mar 22, 2005Published: May 10, 2007
Est. expiryMar 24, 2024(expired)· nominal 20-yr term from priority
Inventors:Franz Josef Feikus
C21D 1/46C22F 1/043C22F 1/04C21D 6/04
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Claims

Abstract

The invention relates to a method for heat treating cast parts produced from a light metal melt, in particular and aluminium melt, with which inherent stresses of castings with a complex form may be eliminated particularly effectively, and can simultaneously be used inexpensively and efficiently in the framework of series production. For this purpose, the respective cast part is quenched after an annealing treatment or is quenched from the casting heat, after quenching is cooled to a low temperature and following low temperature cooling is suddenly heated to a high temperature in that it is immersed in a salt melt, of which the temperature is above the boiling temperature of water at normal pressure.

Claims

exact text as granted — not AI-modified
1 . Method for heat treating cast parts produced from a light metal melt, in particular an aluminium melt, wherein the cast part is quenched after an annealing treatment or is quenched from the casting heat, after quenching is cooled to a low temperature and following low temperature cooling is suddenly heated to a high temperature in that it is immersed in a salt melt, of which the temperature is above the boiling temperature of water at normal pressure.  
   
   
       2 . Method according to  claim 1 , 
 wherein    the cast part is quenched with the aid of water.    
   
   
       3 . Method according to  claim 1 , 
 wherein    characterised in that the low temperature is less than −180° C.    
   
   
       4 . Method according to  claim 1 , 
 wherein,    for cooling to the low temperature, the cast part is immersed in liquid nitrogen.    
   
   
       5 . Method according to  claim 1 , 
 wherein    the cast part is cooled to the low temperature until its core temperature is substantially equal to the low temperature.    
   
   
       6 . Method according to  claim 1 , 
 wherein    the salt melt is heated to at least 150° C.    
   
   
       7 . Method according to  claim 6 , 
 wherein    the salt melt is heated to at least 250° C.    
   
   
       8 . Method according to  claim 1 , 
 wherein    the salt melt has a salt concentration of at least 98% by weight.    
   
   
       9 . Method according to  claim 1 , 
 wherein    the nitrates and/or chromates, in particular alkali metal nitrates and chromates or alkaline earth metal nitrates and chromates, such as NaNO 3 , KNO 3  or Na 2 CrO 4 , are used as the salts.    
   
   
       10 . Method according to  claim 1 , 
 wherein    the cast parts are cylinder heads.    
   
   
       11 . Method according to  claim 1 , 
 wherein    the cast parts are motor units.

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