Aluminum alloy forging heating process
The aluminum alloy can be heated by forging before using various heating equipment, such as an electric resistance furnace, a gas furnace, an oil furnace, an induction heating device, a fluid particle furnace, and the like. Domestically, electric resistance furnace heating is generally used. In this case, it is preferable to install a forced furnace gas circulation device in the furnace to promote uniform furnace temperature. When using a gas or oil burner, low sulfur fuel must be used and the furnace flame does not allow direct injection of the billet surface. It is believed that the aluminum alloy forging heating is the best in the muffle furnace, and the gas semi-closed furnace has been widely used. When the aluminum alloy forging process is highly automated, the commonly used heating methods include induction heating, resistance heating, and fluid particle heating.
The forging temperature range of aluminum alloy is narrow, and it is easy to overheat and burn. Therefore, it is necessary to accurately measure temperature and control temperature, and the furnace temperature deviation is preferably within ±5 °C.
The aluminum alloy has good thermal conductivity, so the blank of any thickness can be directly heated into the high temperature furnace without preheating, but the heating time is longer than that of the ordinary carbon steel. This is because the aluminum alloy must be heated to ensure that the internal strengthening phase is fully dissolved. In order to make the alloy structure uniform and the plasticity is improved. The heating time of the aluminum alloy billet is calculated by the diameter per mm or the thickness of 1.5 to 2 min. The dissolution process of the strengthening phase is related to the size, shape, distribution characteristics and nature of the strengthening phase. The coarser the structure and the slower the dissolution, the higher the upper limit of heating time for ingots, large forgings and coarse bars (φ100mm or more). Billets with high alloying elements have a longer heating time. For example, LC4 should be heated longer than LD2 alloy. Under normal circumstances, the heating time of aluminum alloy is 1~2h. If the extension is unavoidable, the heating time can exceed 4~6h. If it is longer, it is recommended to take the metal out of the furnace to prevent overheating and suction. hydrogen.
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