The generation of pores in the production process of aluminum alloy castings is a common problem. To solve this problem, we need to start from many aspects. The following are some effective solutions: 1. Optimize the treatment of raw materials and select high-quality alloy materials: Aluminum alloy castings ensure that the alloy materials are dry and clean, and avoid containing excessive oxides, nitrides, carbides and other impurities. These impurities will release gas during the smelting process and form pores. Smelting process control: When smelting aluminum alloys, we must strictly follow the operating procedures to control the smelting temperature and avoid overheating that causes the elemental grains to grow and produce bubbles. At the same time, high-quality refining agents or inert gases such as nitrogen should be used to ensure the removal of gas during the smelting process of aluminum alloys. II. Improve the process parameters to adjust the pouring temperature: If the pouring temperature of aluminum alloy castings is too low, some of the tissues in the aluminum alloy cannot be completely dissolved, resulting in bubbles; if the pouring temperature is too high, the aluminum alloy will overheat and be prone to bubbles. Therefore, the appropriate pouring temperature should be selected according to the alloy characteristics and casting requirements. Optimize the filling speed: The filling speed should not be too high or too low, and should be determined according to the structural characteristics of the die-casting alloy and casting. Under the premise of meeting the casting molding and die-casting process conditions, try to reduce the pouring temperature of the aluminum liquid to reduce the volume shrinkage of the casting and the generation of pores. Third, improve the mold design to improve the mold exhaust channel: poor structure of the mold exhaust design will cause the metal liquid to block the exhaust channel prematurely, and the gas in the cavity cannot be discharged completely smoothly during die casting. Therefore, the residual aluminum skin on the mold exhaust channel should be cleaned, the thickness of the gate and the direction of the gate should be changed, and the overflow discharge groove should be set at the position where the pores are formed, so that the gas has a chance to be discharged. Increase the mold cooling system: consider adding core extraction, cold iron or water cooling system when designing, improve the mold cooling rate, and help reduce the generation of pores. Fourth, the use of post-processing technology vacuum infiltration: vacuum infiltration is a method of sealing aluminum alloy die castings due to pores. Introducing the impregnated material into the voids within the wall thickness of the casting by vacuum and pressure methods is a cost-effective and permanent solution to solve the problem of porosity in aluminum alloy die castings. Repair Technology: For the pores that have been generated, high-strength metal fillers (such as 10610 aluminum repair agent) can be used for repair. This repair agent has high strength and wear resistance, and the price is relatively low. After repair, the color is basically the same as the substrate. Five, Other Precautions Aluminum alloy castings Choose appropriate coatings and lubricants: The mold lubricant or coating used in the die casting process of aluminum alloy castings should have less volatile gas, low volatilization temperature and uniform painting, so as to avoid the volatile gas being involved in the alloy liquid. Strengthen on-site monitoring: Regularly inspect and maintain equipment to ensure the stability and controllability of the production process. At the same time, strengthen staff training to improve operational skills and quality awareness.