The production process of aluminum alloy casting plants revolves around raw material processing, melting, forming, and post-processing. Each link needs to be strictly controlled, and precautions should be taken throughout the entire process to ensure the quality of castings and production safety.
The production process begins with raw material preparation, where aluminum ingots and scrap aluminum are mixed in proportion, impurities are removed, and then put into the melting furnace. In the melting stage, the raw materials are melted by fuel or electric heating, and the temperature is raised to 700-750 ℃. Alloy elements are added to adjust the composition, while degassing and slag removal are carried out to remove gases and impurities from the melt.
The molding process can be selected based on the process, including die-casting, sand casting, or low-pressure casting. Die casting uses high pressure to press molten metal into the mold cavity for rapid prototyping; Sand casting relies on sand mold cavity forming and is suitable for complex castings; Low pressure casting uses low-pressure gas to press the melt into the mold, resulting in a denser casting. After forming, wait for the casting to cool to room temperature for demolding or sanding.
Post treatment includes cleaning burrs and burrs on the surface of castings, removing sprues and risers; Heat treatment is carried out according to the requirements to improve the mechanical properties of castings through heating, insulation, and cooling; Perform surface treatment, such as grinding and spraying, to enhance appearance and corrosion resistance.
The precautions need to be implemented in stages. Temperature monitoring is required during melting. Excessive temperature can cause alloy element burnout, while insufficient temperature can result in poor melt flowability; Thoroughly remove gas and slag, otherwise the casting is prone to porosity and inclusions.
During the molding stage, the temperature of the mold should be checked, and the die-casting mold should be preheated to 150-250 ℃ to avoid cold mold affecting the fluidity of the melt; Sand molds need to ensure breathability to prevent the formation of porosity in castings; Moderate force is applied during demolding to prevent deformation of the casting or damage to the mold.
In post-processing, suitable tools should be used to clean burrs to avoid scratching the surface of the casting; The heat treatment temperature and time need to be precisely controlled, and different alloys correspond to different parameters to prevent performance from not meeting standards.
The production environment needs to be kept ventilated, and the smoke generated from smelting needs to be treated before being discharged; Operators need to wear protective equipment to avoid burns from high-temperature melt; Regular equipment inspections are required, and the transmission components of furnaces and die-casting machines need to be lubricated to prevent malfunctions.
Raw material storage should be classified and stacked to avoid mixing; Waste aluminum recycling needs to be screened to prevent the introduction of harmful impurities; Avoid squeezing and deformation when stacking castings.
The production process of aluminum alloy casting plants is interrelated, with precautions involving process parameters, equipment maintenance, personnel protection, etc. Strictly following them can improve the qualification rate of castings, ensure orderly production, and provide qualified blanks for subsequent processing.