Diecasting method and device for carrying out the same

Abstract

The invention relates to a diecasting method used to produce cast parts from a semi-solidified alloy melt. According to the inventive method, the alloy melt is transformed to a semi-solidified state by stimulating the crystallization process, it is then introduced into a casting chamber and the cast pieces are produced by applying pressure. First an exogenous metal suspension is produced outside the casting chamber in a closed-off space that functionally communicates with the casting chamber and forms a casting unit therewith. The metal suspension is set into motion before it is introduced into the casting chamber, thereby forming a hollow rotating body that is maintained rotating until the suspension homogeneity for the casting reached. The invention further relates to a device for carrying out the inventive method. The device comprises a vertical casting chamber with a plunger and a treatment container disposed outside the casting chamber. The treatment container is functionally rigidly linked with the casting chamber and forms a casting unit therewith.

1 . A die casting method for producing cast parts from a semi-solidified alloy melt, whereby the alloy melt is transformed to a semi-solidified state by stimulating the crystallization process, introduced into a casting chamber, and the cast parts are produced under pressure, characterized in that an exogenous metallic suspension is produced outside of the casting chamber in a closed space functionally connected with the casting chamber and forming one casting unit with the latter, whereby the metallic suspension is set in motion before entering the casting chamber, and whereby a hollow rotating body is formed, said body being maintained in the rotating state until the homogeneity of the suspension for pouring it into the chamber has been reached.  
     
     
         2 . The method according to  claim 1 , characterized in that the stimulation of the crystallization process takes place in a rotating electromagnetic field.  
     
     
         3 . The method according to any one of the preceding claims, characterized in that for stabilizing the rotating melt thermodynamically, a cooling powder is introduced which abruptly puts the melt into a semi-solidified state.  
     
     
         4 . The method according to any one of the preceding claims, characterize in that the formation of the melt takes place under the action of elastic oscillations of the liquid metal.  
     
     
         5 . The method according to any one of the preceding claims, characterized in that the cooling powder is put into a pulsating state and introduced into the melt.  
     
     
         6 . The method according to any one of the preceding claims, characterized in that the cooling powder is introduced into the melt under pressure, whereby air, argon or nitrogen are used as carrier gas.  
     
     
         7 . The method according to any one of the preceding claims, characterized in that the outflowing metallic melt is subjected to the influence of an electromagnetic field.  
     
     
         8 . The method according to any one of the preceding claims, characterized in that 
 the casting plunger is synchronously displaced downwards as the casting chamber is being filled and the rise in the filling level is enforced in this way.    
     
     
         9 . A device for carrying out the method according to any one of the preceding claims, comprising a vertical casting chamber with a casting plunger and a treatment container arranged outside of the casting chamber, characterized in that the treatment container functionally communicates with the casting chamber and forms one casting unit therewith.  
     
     
         10 . The device according to the preceding claim, characterized in that the treatment container is surrounded by a coil generating an electromagnetic field within the treatment container; and that the treatment container is connected with the casting chamber via a transport chamber.  
     
     
         11 . The device according to any one of the preceding claims, characterized in that the treatment container contains a closing device by which the container can be completely sealed during the treatment or during the rotation of the melt.  
     
     
         12 . The device according to any one of the preceding claims, characterized in that the transport chamber is mounted at a right angle in relation to the casting chamber.  
     
     
         13 . The device according to any one of the preceding claims, characterized in that the transport chamber is mounted at an acute angle in relation to the casting chamber.  
     
     
         14 . The device according to any one of the preceding claims, characterized in that the transport chamber is equipped with a transport plunger sealing the filling opening of the casting chamber.  
     
     
         15 . The device according to any one of the preceding claims, characterized in that on its side facing the filling opening of the casting chamber, the transport plunger is designed in such a manner that its frontal contour is a continuation of the inner contour of the casting chamber.