Copper rotor casting method

Abstract

The invention belongs to the technical field of motors, and specifically provides a casting method of a copper rotor. The method is mainly characterized by comprising the following steps: mounting a die, namely, arranging the die in a vacuum chamber; melting copper, wherein a copper melting furnace communicates with the die through a molten copper lifting tube so as to form a vacuum melting surface; casting, wherein an inert gas pressure tank communicates with one side of the copper melting furnace, and a hydraulic cylinder communicates with one side of the die; performing pressing and injecting, releasing the pressure, then recovering inert gas, and returning the rest molten copper into the melting furnace; moving out a technological casting, namely, opening an air inlet valve at one side of the vacuum chamber, then opening a door in the vacuum chamber, and moving out the copper rotor casting. Compared with the prior art, the method has the advantages that the copper is prevented from oxidization and bubble in the melting, casting and forming steps; the molten copper is high in flowability, so that the mass and electric conductivity of the copper rotor can be improved.

Description

technical field [0001] The invention belongs to the technical field of motors, relates to a rotor of a motor, in particular to a copper rotor casting method. Background technique [0002] Traditional motor rotors are cast aluminum rotors. In order to save electric energy and increase the power of the motor, some people have explored changing the cast aluminum rotor to the cast copper rotor in recent years, but the production of the cast copper rotor is relatively difficult. [0003] In the production process of cast copper rotor, when the copper melting stage exceeds 1150°C, it will be oxidized in large quantities, the fluidity of copper liquid will become poor, and more air bubbles will appear in the casting stage, or short circuit will cause pores inside the copper rotor casting. Or the phenomenon of "hydrogen embrittlement" will seriously affect the quality and performance of the rotor, thereby affecting the working effect of the motor. Some people take it in the copper...

AI Technical Summary

Problems solved by technology

In order to save electric energy and increase the power of the motor, some people have explored changing the cast aluminum rotor to the cast copper rotor in recent years, but the production of the cast copper rotor is more difficult.

[0003] In the production process of cast copper rotor, when the copper melting stage exceeds 1150°C, it will be oxidized in large quantities, the fluidity of copper liquid will become poor, and more air bubbles will appear in the casting stage, or short circuit will cause pores inside the copper rotor casting. Or the phenomenon of "hydrogen embrittlement" will seriously affect the quality and performance of the rotor, thus affecting the working effect of the motor

Some people take it in the copper melting stage, when the temperature reaches 800 ° C, add an appropriate amount of surface covering agent, such as charcoal, or carbon, or borax, when the temperature reaches 1000 ° C, add an appropriate amount of thinner, such as phosphor copper, but this is due to the addition of impurities It will also affect the conductivity of the copper rotor, and ultimately affect the working effect of the motor