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What is the aging control of extrusion workshop in aluminum plant?
The aluminum profile produced by extrusion has low hardness before aging and cannot be used as a finished product. Therefore, in general, it is necessary to age and enhance its strength. Generally, aging can be divided into natural aging and artificial aging. At present, the production of 6xxx aluminum profiles is basically the latter. So, how to prevent the hardness of aluminum profiles from being insufficient after artificial aging? Through long-term follow-up investigation, the working meeting summarized the following methods:

Control of production process:

1. Ingot temperature control: measure the temperature of the ingot before the extruder, and the ingot can be produced on the machine only after the process requirements are met.

2. On-line quenching process: solution quenching is the basic premise of aging, and it is meaningless without solution quenching aging. Therefore, online quenching process (air quenching, gas mist quenching, water quenching, etc. ) should be selected at the outlet of the extruder according to the ingot brand, profile wall thickness, extrusion speed and quenching equipment conditions to ensure that the quenching cooling rate meets the quenching sensitivity requirements of the alloy.

3. Setting and control of aging furnace temperature: In general, there is a certain error between the aging furnace temperature and the apparent temperature of the aging furnace. When setting the surface temperature, it should be set according to the actual temperature in the furnace, and pay close attention to the fluctuation of the aging furnace temperature.

4. Aging and heat preservation: aging shall be carried out in strict accordance with the process requirements, and the heat preservation time shall be appropriate to prevent insufficient hardness caused by under-aging or over-aging.

Blank frame and charging

1, extrusion framing should not be too dense, and there should be gaps between materials, especially small and thick materials that are not ventilated. When the pipe is combined with small materials and sheets, the pipe should be placed below, which is conducive to aging and circulating air supply.

2. Before charging, other special alloys of 6xxx should be charged separately from ordinary 6063 alloy for aging. If it is really necessary to age in the same furnace for production reasons, special alloy technology should be adopted for aging.