Processing method of 2xxx series aluminum alloy bars and wires for fasteners

Abstract

The invention discloses a processing method of 2xxx series aluminum alloy bars and wires for fasteners, which comprises the following steps: adding an intermediate alloy into an aluminum ingot, smelting in a smelting furnace, and then carrying out semi-continuous casting to obtain an industrial cast ingot; carrying out homogenization treatment on the cast ingot added with the alloy, increasing the temperature of the cast ingot to 480-505 DEG C from the room temperature in a one-stage or multi-stage heating mode, and conducting out heat preservation for 10-60 h; extruding the obtained cast ingot into a bar, controlling the extrusion outlet speed of the profile to be 0.1-4 mm/s, and controlling the extrusion temperature to be 360-470 DEG C; carrying out annealing heat treatment on the extruded bar blank, the annealing process parameters are as follows: the temperature is 250-450 DEG C, the annealing time is 0.5-3 h, the bar blank is discharged from a furnace and cooled in air, and an annealed bar is obtained; carrying out cold drawing on the extruded bar or the extruded and annealed bar; carrying out solid solution quenching on the cold-drawn bars and wires; and pre-stretching the bars and the wires, and controlling the pre-stretching amount to be 0.1%-3%;.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a processing method for 2xxx series aluminum alloy rods and wires for fasteners. Background technique [0002] As mechanical basic parts, fasteners are used in the largest amount on aircraft, accounting for about 65% of the total aircraft parts, 5% of the weight of the aircraft structure, and 10%-15% of the total value of the aircraft structure. As the connecting piece of the main engine and components, fasteners, together with the main engine and components, bear the requirements of basic performance, and need to adapt to high temperature, high pressure, low temperature, vibration, corrosion, heavy load, alternating stress, shear resistance and torsion resistance, etc. . As an important connecting unit, high-end fasteners have important application value. The materials used to manufacture fasteners must have strict standard requirements, and its p...

AI Technical Summary

Problems solved by technology

[0004] The development of high-strength aluminum alloy fasteners in my country is relatively late, and there is a big gap in production, development and application compared with foreign countries. In the later processing into fasteners, defects such as cracks and folding are prone to occur during the molding process, which greatly reduces the tension. Firmware production efficiency increases production cost

Although 2xxx series and 7xxx series aluminum alloys have high strength, they are not easy to be processed and formed later.

However, the angular bending channel extrusion and continuous extrusion process are complicated, and are not suitable for the processing and deformation of large-scale ingots of the 2xxx series.

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