The initial pouring temperature refers to the initial temperature of the melt just entering the sprue from the gate, and the initial pouring temperature significantly affects the casting quality of the casting [27]. Reasonable initial pouring temperature: the alloying degree of the metal melt is better, and at the same time, it can give the melt enough filling power, which is beneficial to the forming effect of the casting in the later stage of solidification. When the initial pouring temperature is too high, the internal elements of the melt may be damaged during smelting, resulting in inhalation, oxidation, etc., and the forming quality cannot be guaranteed, and the volume shrinkage rate during filling and solidification is large, which is prone to shrinkage cavities and shrinkage. , coarse dendrites and other undesirable phenomena; too high initial pouring temperature will also have a certain impact on the mold, such as: damage to the inner wall of the cavity, and overheating causes the mold to burst. Similarly, when the initial pouring temperature is too low, it will cause poor filling ability of the melt, premature solidification, and incomplete casting. For aluminum alloy materials, the initial pouring temperature should be in a certain range above the liquidus (20~100 ℃), the primary α-Al at this temperature can be solidified into spherical or granular, fine grain, uniform distribution, casting mechanics Better performance.