Experiment used crystallization stirrer by IDEA

                     Electromagnetic stirring has the following characteristics:             (1) The electromagnetic stirring and liquid with no physical contact, do not pollute the liquid aluminum, it has great significance in melting high purity aluminum and alloy research.             (2) It can effectively solve the problem of uniformity of alloy composition, in some cases it can reach the effect which artificial mixing could not.            (3) Does not destroy oxide layer mixing, thus can reduce the oxidation slag, to reduce the burning loss rate.             (4) Stirring direction and stirring intensity can be adjusted.             (5) A one-time investment, the cost is low, save energy, enhance productivity.             (6) Simple and convenient for operation and maintenance.                  Operating principle               Electromagnetic stirring method using the electromagnetic induction in half a liquid metal solidification of the induced current, induced current under the action of magnetic field makes the metal solid liquid slurry agitation fiercely, make traditional dendritic structure into non dendritic mixing organization.                     System composition               This system with INTER high-performance 16 bits MCU as the core makes up with AC-DC-AC variable-frequency power source, electromagnetic sensors, control interface operation, cooling system, etc.                  System advantage             In order to convenient laboratory research, the semi-solid metal in the sensors stress relations with dendrite. This system adopted voltage, frequency, stirring time continuous adjustable, make the semi-solid metal stress condition be clear at a glance. Simple operation control interface, man-machine interface simple and clear, all operations on the control panel can be finished immediately.                                Compared with other mixing way, electromagnetic stirring compatible with the other mixing way’ advantages, and has its own unique characteristic, therefore, electromagnetic stirring has become the common use stirring method.               Effect of stirring                 To adopt the advanced technology of electromagnetic stirring, through lots of experiments and industrial production at home and abroad by using electromagnetic stirring main effect achieved:                  Reducing slag content;                 Reduce the center shrinkage cavity;                 Eliminate the macrosegregation;                 Increase the equiaxial crystal ratio;                Improve solidification organization, etc.