Aluminum alloys can be heated before forging with various heating equipment, such as resistance furnaces, gas furnaces, fuel furnaces, inductive heating devices, and dance particles. Domestic resistance furnaces are generally selected. In this case, it is best to have a compulsory furnace gas circulation device in the furnace to promote uniform furnace temperature. When using an gas furnace or fuel furnace, low sulfur fuel must be used, and the flames in the furnace are not allowed to spray the surface of the blank. Foreign abroad believes that aluminum alloy forging heating is the best for the Malanda furnace, and the semi -closed furnace of gas has been widely used. When the aluminum alloy forging process is highly automated, the commonly used heating methods include inductive heating, resistor heating, and darning particles heating.
The forging temperature of aluminum alloy is narrow and easy to heat and burn, so the temperature measurement must be accurately measured and temperature control. The furnace temperature deviation is best within the range of ± 5 ° C.
The aluminum alloy has good thermal conductivity, so any thickness of the thickness can be heated in high temperature furnace without preheating, but the heating time is longer than ordinary carbon steel. This is because the aluminum alloy must be fully dissolved when the aluminum alloy is heated. In order to make the alloy tissue uniform and the plasticity is improved. The heating time of the aluminum alloy billet is calculated according to the diameter or thickness of 1.5 to 2 minutes per mm. The dissolution process of the enhancement phase is related to the size, shape, distribution characteristics and nature of the enhanced phase. The larger the tissue, the slower the dissolution. Therefore, the upper limit of heating time should be taken. The heating time with high alloy element content is longer. For example, LC4 should be longer than the heating time of LD2 alloy. Under normal circumstances, the heating time of aluminum alloy is 1 to 2 hours. If you encounter a last resort, the heating time can exceed 4 to 6h. hydrogen.