On-line quenching system and on-line quenching process of high-strength aluminum alloy

Abstract

The invention discloses a high-strength aluminum alloy on-line quenching system and an on-line quenching process. The on-line quenching system includes an extrusion machine, a holding furnace, a quenching device and a tractor; Pulling while hot extrusion, heat preservation or heat preservation, and quenching treatment steps; after adopting the high-strength aluminum alloy online quenching system and its online quenching process of the present invention, the aluminum alloy profile leaves the profile exit of the extruder to the quenching device for rapid Cooling and quenching treatment, the entire transfer process takes a very short time, realizing instant on-line quenching and continuous production after the extrusion of aluminum alloy profile extrusion products, the production cycle is greatly shortened, and the consistency of product quality is guaranteed; during the production process, heat Less loss, low energy consumption, not only saves energy, but also improves the environment. Compared with the vertical air furnace quenching process, it can save more than 80% of energy, and the economic benefits are objective.

Description

technical field [0001] The invention relates to the technical field of heat treatment of high-strength aluminum alloys, in particular to a system for on-line quenching of high-strength aluminum alloys and an on-line quenching process thereof. Background technique [0002] In the series of high-strength aluminum alloys, 2XXX series aluminum alloys are called duralumin, and 7XXX series aluminum alloys are called super duralumin. Due to the high hardness and high deformation resistance of these two series of aluminum alloys, when the aluminum alloy cast rods are hot-extruded into aluminum alloy profiles, the extrusion speed is very slow, generally between 0.8-3.5 m / min. Since such a slow speed cannot guarantee the temperature consistency of the entire extruded aluminum alloy profile, online quenching cannot be realized. At present, most of the vertical air furnaces are used to quench the aluminum alloy profiles. The process is: preheating the aluminum alloy casting rods → extr...

AI Technical Summary

Problems solved by technology

[0004] (1) The temperature of the aluminum alloy profile extruded by the extrusion machine is very high (above 440°C), but this part of the heat is not fully utilized, but is naturally lost to the surrounding environment, and the aluminum alloy profile is cooled to Normal temperature, and before the subsequent quenching step, it is necessary to put the aluminum alloy profile at normal temperature into a vertical air furnace for reheating, heating, and heat preservation to reach the required quenching temperature, so this quenching process consumes a lot of energy and the surrounding environment The temperature is high and the operating environment is harsh; the investment of a vertical air furnace is expensive, and the investment of a vertical air furnace is usually between 1 million yuan and 10 million yuan (according to the height of the vertical quenching furnace); in addition, it is necessary to build a Deep water well for quenching

Therefore, the whole set of equipment investment is large

[0005] (2) This quenching process is intermittent production, aluminum alloy profiles cannot be continuously quenched online, and the production cycle is long, generally takes 2-3 days

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