东莞压铸转子铁心的叠压Dongguan die-cast rotor core laminate
Cast aluminum rotor is one of the important components of the motor, its quality will directly affect the efficiency of the motor, power factor, temperature rise, such as starting and running performance. Stomatal refers to the hole diameter is greater than 1 ~ 31 ti1ti, distributed in the conductor interior, surface, or close to the surface, the shape is round, oval or irregular, dongguan die-casting distribution is the characteristic of air hole, hole is generally smooth surface. At present, in the motor manufacturing industry in our country, adopt the die casting process, the production of cast aluminum rotor porosity is a common problem, and is difficult to eradicate. Its reason is various, it has to do with the working state of the die casting machine, die casting technology parameters are selected, the structure of die mold, rotor core of overlying, melting process and the die casting process of aluminum and aluminum alloy of various factors such as the operation.
The reasons causing
Porosity is the main cause of the pressure chamber is insufficient, lead to gas occupies a space in the pressure chamber, at the same time in the injection of gas and liquid aluminum into the cavity caused by die casting mould. Process measures are as follows:
Between rotor slice of remaining oil
Rotor slice of remaining oil is cast aluminum rotor produces a main cause of porosity. Dongguan die casting due to the rotor die casting is in high temperature, high pressure and the formation of a moment, in liquid aluminum just full of rotor cavity, liquid with high temperature aluminum or rotor asked oil reaction occurs, the generated gas, the gas escape some are, some surrounded by liquid aluminum. Aluminum liquid solidified rapidly, however, surrounded to run out of gas, so the gas bubbles in the form of residual in the rotor cage bar and side ring, irregular distribution state.