Method of manufacturing al alloy cast material

Abstract

Provided is a method of producing an Al alloy cast material capable of properly adjusting an additive amount of Ti. The present invention is directed to a method of producing an Al alloy cast material in which an Al alloy molten metal supplied to a casting machine through a molten metal passage is solidified by the casting machine to produce an Al alloy cast material. The production method of the present invention includes a primary Ti-addition step of preliminarily adding Ti to an Al alloy molten metal before flowing through a molten metal passage and a secondary Ti-addition step of adding Ti to an Al alloy molten metal flowing through a molten metal passage by a feeder.

1 . A method of producing an Al alloy cast material in which an Al alloy molten metal supplied to a casting machine through a molten metal passage is solidified by the casting machine to produce an Al alloy cast material, the method comprising:
 a primary Ti-addition step of preliminarily adding Ti to an Al alloy molten metal before flowing through the molten metal passage; and   a secondary Ti-addition step of adding Ti to the Al alloy molten metal flowing through the molten metal passage by a feeder.   
     
     
         2 . The method of producing an Al alloy cast material as recited in  claim 1 ,
 wherein the Al alloy molten metal is composed of an Al—Mg—Si based alloy.   
     
     
         3 . The method of producing an Al alloy cast material as recited in  claim 1 ,
 wherein when an additive amount of Ti to be added in the primary Ti-addition step is defined as “X” mass %, an additive amount of Ti to be added in the secondary Ti-addition step is adjusted to “0.1X” mass % to “2X” mass %.   
     
     
         4 . The method of producing an Al alloy cast material as recited in  claim 1 ,
 wherein a time from an addition of Ti in the primary Ti-addition step to an addition of Ti in the secondary Ti-addition step is adjusted so as to fall within 5 minutes to 30 minutes.   
     
     
         5 . The method of producing an Al alloy cast material as recited in  claim 2 ,
 wherein a molten metal temperature in the molten metal passage is adjusted to 700° C.±30° C.   
     
     
         6 . A method of producing an Al alloy plastic worked product, comprising:
 plastically working the Al alloy cast material produced by the method as recited in  claim 1  to produce an Al alloy plastic worked product.   
     
     
         7 . The method of producing an Al alloy plastic worked product as recited in  claim 6 ,
 wherein the Al alloy plastic worked product is used as a structural material of a transportation machine.   
     
     
         8 . A production apparatus of an Al alloy cast material, comprising:
 a molten metal reservoir configured to store a Ti-added Al alloy molten metal;   a casting machine configured to cast an Al alloy cast material by solidifying an Al molten metal;   a molten metal passage configured to supply the Al alloy molten metal stored in the molten metal reservoir to the casting machine; and   a feeder configured to add Ti to the Al alloy molten metal flowing through the molten metal passage.   
     
     
         9 . The production apparatus of an Al alloy cast material as recited in  claim 8 ,
 wherein the molten metal reservoir is configured by a melting furnace for melting an Al alloy material or a holding furnace for performing a temperature adjustment of the Al alloy molten metal.   
     
     
         10 . The production apparatus of an Al alloy cast material as recited in  claim 8 ,
 wherein the molten metal reservoir is configured by a melting/holding furnace which serves as both a melting furnace for melting an Al alloy material and a holding furnace for performing a temperature adjustment of the Al alloy molten metal.