1. Pouring temperature
Pouring temperature refers to the temperature of the molten metal when it is poured into the pressure chamber. In production, the pouring temperature is controlled by controlling the temperature of the alloy liquid in the holding furnace.
For castings of different shapes and structures, the pouring temperature of aluminum alloy can be controlled at 630~730℃; for thin-walled complex parts, a higher temperature can be used to improve the fluidity of the molten metal and obtain good molding; for thick-walled structural parts, a lower temperature can be used to reduce solidification shrinkage. If the pouring temperature is too high, the air absorption in the aluminum water will increase, making it easy to produce pinholes, shrinkage holes, and surface bubbles in the thick wall of the casting; at the same time, the corrosion of the mold will be accelerated, causing the mold to age and crack prematurely.
If the pouring temperature is too low, the fluidity is poor, and it is easy to produce defects such as cold shut, flow lines, and insufficient pouring; if the temperature is too low, the aluminum liquid is prone to composition deviation, resulting in hard points in the casting, making post-processing difficult.

2. Aluminum alloy die-casting mold temperature
Mold temperature generally refers to the mold surface temperature. Its standard state should be about 1/3 of the aluminum alloy liquid pouring temperature. The mold temperature greatly affects the mechanical properties of the die-casting, dimensional accuracy and the life of the die-casting mold. It must be strictly done according to the specifications.
(1) Mold temperature affects the life of the die-casting mold
During the continuous die-casting production process, the mold temperature cycles from high temperature to low temperature every time the die-casting is performed, and is continuously heated and cooled. Thermal stress is generated inside the mold due to the temperature difference. When the mold material is in a ductile state, the stress causes the mold to produce plastic deformation; when it is in a brittle state, the stress causes the mold to produce thermal cracks and cracks. The periodic thermal stress action causes thermal fatigue of the mold, resulting in cracks, excessive mold temperature, and easy deformation of the mold.
(2) Mold temperature affects the effect of the release agent
When the mold temperature is too high, the release agent volatilizes excessively at high temperature and cannot form a dense film, which is easy to cause sticking. If the mold temperature is too low, the film formed by the release agent contains unvolatile water, which is a poor demolding effect and will also cause air holes and cold shut defects in the casting.
(3) Mold cooling method
To improve the efficiency of die casting production and the quality and density of die castings, it depends largely on the temperature adjustment of the die casting mold. In large, medium or thick-walled die castings and mass production, in continuous operation, in order to maintain high quality and high yield of die castings, it is best to use a mold temperature controller. Or a water cooling device is installed in the mold to quickly discharge heat with the cooling cycle.
The cooling methods of the mold mainly include air cooling, water cooling, oil cooling, etc.
According to the characteristics of the wall thickness of the casting and the mold structure, some parts are cooled by a point cooling structure for centralized circulation cooling. This cooling method has a high local cooling intensity and is difficult to clean the cooling channel. It is suitable for cooling important parts of the mold. Some complex molds may need to be cooled by a point cooling structure in multiple places. For cooling other parts, the method that is easiest to clean the channel is used. Through holes are processed along the cavity and connected to the outside with a copper tube for circulation cooling. This cooling method is very common.