Online extrusion production technology for 7A04 high-strength bar

Abstract

The invention belongs to the technical field of aluminum alloy extrusion technology, and relates to an online extrusion production technology for a 7A04 high-strength bar. The temperature of an extrusion barrel head in an extruder is controlled to range from 450 DEG C to 500 DEG C and is increased compared with the original temperature, the temperature of an extrusion die is set to range from 500 DEG C to 520 DEG C, and the heating temperature of a 7A04 aluminum alloy cast ingot is set to range from 380 DEG C to 420 DEG C, the product extrusion speed is controlled to range from 1.5 m / min to 2.5 m / min, and the temperature of the 7A04 high-strength bar before quenching is larger than or equal to 380 DEG C. After the 7A04 high-strength bar is placed for 2 days and nights, precipitation heat treatment of (125+ / -5) DEG C x (16-20)h is conducted. According to the 7A04 high-strength bar prepared through the extrusion production technology, by utilization of a non-standard extruder and strict control over various technology parameters in the extrusion production technology, the purpose of online production of the 7A04 high-strength bar is achieved, various properties of the 7A04 high-strength bar can meet the using requirement, the production capability of the enterprise is greatly improved, and the production cost is saved for the enterprise.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy extrusion process, and relates to an online extrusion production process of 7A04 high-strength bar. Background technique [0002] 7A04 aluminum alloy is a typical superhard aluminum alloy, which is widely used in aerospace, such as aircraft skins, screws, and stressed components such as girder stringers, bulkheads, wing ribs, landing gear, etc. The process flow of 7A04 high-strength bar in the actual extrusion production process is: three processes: extrusion forming-offline quenching treatment-aging strengthening treatment, but because the 7A04 aluminum alloy is relatively hard and the deformation resistance of the alloy is relatively large, the actual extrusion production The extrusion speed is controlled within the range of 0.5-0.9mm / s, and the heating temperature of the aluminum alloy ingot is controlled at 310-400°C. If the extrusion speed is too fast, it will cause cracks on the surfa...

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Problems solved by technology

[0003] In view of this, in order to solve the existing production process of 7A04 high-strength bars, the extrusion speed is too slow, resulting in the low daily output of 7A04 high-strength bars, and the 7A04 high-strength bars are time-consuming and expensive in the later offline solid solution stage. To solve the problem of consuming a lot of energy, provide an online extrusion production process for 7A04 high-strength rods

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