Unisource high-strength ultrasound-assisted method for casting large-specification 2xxx series aluminium alloy round ingot

Abstract

In the technical field of metal melting, a unisource high-strength ultrasound-assisted method for casting large-specification 2XXX series aluminum alloy round ingots applies in an ingot guiding process, a unisource high-strength ultrasonic vibration system to the center of a hot-top crystallizer, ultrasound directly acts on the center position of a crystallizer, and enough ultrasonic field energy is provided for a melt by controlling the power of the ultrasonic vibration system, so that an aluminum alloy solidification process is implemented under the effect of ultrasound, homogenization of microstructures and components of ingots is promoted, and the existing problems that microstructures are thick and crystal phases are enriched due to slow cooling of centers of large-specification round ingots are effectively solved, meanwhile, the problems of great operation difficulty and heavy workload during multisource ultrasonic coupling are avoided.

1 . A unisource high-strength ultrasound-assisted method for casting large-specification 2XXX series aluminum alloy round ingots, comprising the following steps:
 performing solidification and ingot guiding by
 enabling melt of 2XXX series aluminum alloy to flow into a hot-top crystallizer, 
 after ingot guiding is started, applying a set of ultrasonic vibration system to the center of a crystallizer of the hot-top crystallizer, and 
   when casting is about to end, removing the ultrasonic vibration system, to obtain a large-specification 2XXX series aluminum alloy round ingot;   wherein power of the ultrasonic vibration system being is 2˜4 kw; and   wherein diameter of the large-specification 2XXX series aluminum alloy round ingot is ≥500 mm.   
     
     
         2 . The method according to  claim 1 , wherein the diameter of the large-specification 2XXX series aluminum alloy round ingot is 500-1380 mm. 
     
     
         3 . The method according to  claim 1 , wherein the ultrasonic vibration system comprises an ultrasonic transducer, an amplitude transformer and a radiation rod, length of the radiation rod being 490 mm. 
     
     
         4 . The method according to  claim 3 , wherein the depth of the radiation rod of the ultrasonic vibration system immersing into the melt is 15˜480 mm. 
     
     
         5 . The method according to  claim 1 , wherein frequency of the ultrasonic vibration system is 15˜30 khz. 
     
     
         6 . The method according to  claim 1 , wherein an applying mode of the ultrasonic vibration system is to vertically guide the radiation rod into the melt from top to bottom. 
     
     
         7 . The method according to  claim 1 , wherein before applying the ultrasonic vibration system, also comprising:
 preheating the radiation rod of the ultrasonic vibration system;   wherein the preheating temperature being is not lower than 350° C.