Aluminum alloy for casting motor rotor in new energy vehicle and preparation method therefor

Abstract

The present application belongs to the technical field of new energy vehicle motors, and discloses an aluminum alloy for casting a motor rotor in a new energy vehicle and a preparation method thereof. The aluminum alloy includes 0.05 wt %-0.06 wt % titanium, 0.04 wt %-0.06 wt % boron, 0.15 wt %-0.5 wt % silicon, 0.01 wt %-0.08 wt % iron, 0.5 wt %-0.7 wt % copper, 0.3 wt %-0.5 wt % magnesium, 0.01 wt %-0.2 wt % zinc, 0.02 wt %-0.12 wt % manganese, and the balance of aluminum. By adding new elements and adjusting the ratio of the elements, the strength of the cast aluminum alloy is enhanced, and meanwhile, the excellent electricity conductivity can also be kept.

1 . An aluminum alloy for casting a motor rotor in a new energy vehicle, comprising 0.05 wt %-0.06 wt % titanium, 0.04 wt %-0.06 wt % boron, 0.15 wt %-0.5 wt % silicon, 0.01 wt %-0.08 wt % iron, 0.5 wt %-0.7 wt % copper, 0.3 wt %-0.5 wt % magnesium, 0.01 wt %-0.2 wt % zinc, 0.02 wt %-0.12 wt % manganese, and the balance of aluminum. 
     
     
         2 . The aluminum alloy for casting the motor rotor according to  claim 1 , wherein tensile strength of the aluminum alloy is in a range from 80 MPa to 95 Mpa. 
     
     
         3 . The aluminum alloy for casting the motor rotor according to  claim 2 , wherein tensile strength of the aluminum alloy is in a range from 85 MPa to 95 Mpa. 
     
     
         4 . The aluminum alloy for casting the motor rotor according to  claim 1 , wherein yield strength of the aluminum alloy is in a range from 60 MPa to 80 Mpa. 
     
     
         5 . The aluminum alloy for casting the motor rotor according to  claim 1 , wherein elongation of the aluminum alloy is in a range from 45% to 55%. 
     
     
         6 . The aluminum alloy for casting the motor rotor according to  claim 1 , wherein electricity conductivity of the aluminum alloy is in a range from 30 MS/m to 33 MS/m. 
     
     
         7 . The aluminum alloy for casting the motor rotor according to  claim 1 , composed of 0.05 wt %-0.06 wt % titanium, 0.04 wt %-0.06 wt % boron, 0.15 wt %-0.5 wt % silicon, 0.01 wt %-0.08 wt % iron, 0.5 wt %-0.7 wt % copper, 0.3 wt %-0.5 wt % magnesium, 0.01 wt %-0.2 wt % zinc, 0.02 wt %-0.12 wt % manganese, and the balance of aluminum. 
     
     
         8 . The aluminum alloy for casting the motor rotor according to  claim 7 , wherein the aluminum is high purity aluminum, and the high purity aluminum is pure aluminum with purity greater than 99.8%. 
     
     
         9 . A preparation method of an aluminum alloy for casting a motor rotor, wherein the method uses each elemental constituent in  claim 1  and comprises the following steps:
 (1) melting an aluminum ingot, adding each elemental constituent, and performing even stirring; and 
 (2) preheating a rotor cavity, and performing centrifugal casting to prepare the aluminum alloy for casting the motor rotor. 
 
     
     
         10 . The preparation method according to  claim 9 , wherein a temperature in step (1) is in a range from 700° C. to 760° C., and a preheating temperature in step (2) is in a range from 680° C. to 720° C.