(Summary description)The temperature of aluminum die casting die shall be determined according to the shape of the casting, the material of the molten metal and other conditions.
As we all know, in continuous casting, the mold temperature rises and falls once every time the injection is made. In such a continuous and repeated lifting cycle, the temperature changes considerably. Therefore, which time temperature is used as the reference point for measuring the mold temperature? The ideal reference point is the surface temperature of the mold cavity before the metal liquid is about to be filled as the control reference of the mold temperature. But it is difficult to measure this temperature. Generally speaking, the surface temperature of the mold cavity after the casting is taken out is taken as the measurement benchmark of the mold temperature, which is called the mold temperature.
For general die-casting dies, it is better to take out the casting in continuous casting and the temperature of the cavity surface is about 40% of the alloy melting point (for example, if the alloy melting point is 600 ℃, the mold temperature is about 240 ℃; if the alloy melting point is 375 ℃, the mold temperature is about 150 ℃). However, the mold temperature of thin-wall castings should be slightly increased; Heavy wall castings should be slightly reduced.
High temperature of molten metal makes it easy to cast. However, if the temperature of molten metal is too high, the gas content will increase, and pinholes and pores will be easily formed; Moreover, the shrinkage cavity increases after filling the mold cavity, and the defects of shrinkage cavity and surface shrinkage pit are easy to occur; What is more serious is that it shortens the service life of the mold and melting batch, increases the melting cost and other adverse factors. In this way, the temperature of molten metal should be low, but it should not be too low, otherwise the fluidity is poor and the casting forming is difficult.
In addition, when the filling process is carried out on a low-power die-casting machine, the temperature of the molten metal should also be higher. For castings where the mold temperature is not easy to rise and inserts such as motor rotors have great resistance to the flow of the molten metal, the temperature of the molten metal should also be higher.

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• Time of issue:2021-12-27 14:02
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