[Aluminum of China Aluminum] Extrusion-produced aluminum profiles, which have low hardness before aging, cannot be used as finished products. Therefore, in general, they must be aged to improve strength. Generally, aging can be divided into natural aging and artificial aging. At present, 6xxx aluminum extrusion production is basically still the latter. Therefore, how to prevent aluminum artificial aging hardness is not enough? The workshop summarized the methods through long-term tracking and investigation as follows:
The control of production process 1, the temperature control of the ingot: Before the extrusion on the machine to measure the temperature of the ingot, reach the process requirements can be on the machine production.
2, online quenching process: solution quenching is the basic premise of aging, there is no meaning of the solution hardening quenching. Therefore, the on-line quenching process (wind quenching, wind-fog quenching, water quenching, etc.) is selected based on the ingot number, profile wall thickness, extrusion speed, and quenching equipment condition at the discharge port of the extruder to ensure the quenching cooling rate. Meet the alloy's quench sensitivity requirements.
3. Setting and control of aging furnace temperature: Usually, there is a certain error between the aging furnace temperature and the apparent temperature of the aging furnace. When setting the table temperature, set according to the actual temperature of the furnace and pay close attention to the aging furnace temperature. Volatility.
4, aging insulation: to strictly in accordance with the process requirements for aging, the insulation time should be appropriate to prevent the lack of timeliness or overtime and resulting in insufficient hardness.
The blank frame, the furnace 1, the extrusion frame can not be too dense, there must be a gap between the material and the material, especially the non-ventilated small material, thick material spacing should be larger, tube material and small material, board material When a frame is put, the tube is put below to facilitate the circulation of the aging circulation.
2. Before loading the furnace, other special alloys of 6xxx and ordinary 6063 alloys are separately loaded and furnace aged. For production reasons, it is necessary to use the special alloy process to perform aging when the furnace is actually aged.