The density ratio of aluminum to steel is 1:3, which can save 1 / 2 in quality. Steel aluminum compound die is used. The cost of aluminum alloy die is about 15% lower than that of steel die. The manufacturing time of aluminum die is much shorter than that of steel die, so it takes less time and has obvious advantages. The cutting cost of the aluminum die is 35% lower than that of the steel die. For the aluminum die, the following processes can be used: repair welding (repair and correction welding), surface hardening treatment (anodizing, electroless plating and nickel plating, etc.) the milling time of the steel die is 5-10 times longer than that of the aluminum die, 5 times longer than the drilling time, 4 times longer than the EDM time, 3-4 times longer than the polishing time, and the service life of the cutting tool is longer than that of the steel die Four times longer. Using aluminum steel compound die can greatly shorten the processing time and save the processing cost. Typical alloys: 2024, 5052, 5754