Aluminum alloy bar and production method thereof

Abstract

The invention discloses an aluminum alloy bar. The aluminum alloy bar is prepared from, by mass, 3.8-4.0% of Cu, 0.6-0.7% of Mg, 0.55-0.6% of Mn, 0.5-0.55% of Si, 0.25-0.3% of Fe, 0.012-0.02% of Ti, 0-0.1% of Cr, 0-0.1% of Zn and the balance Al. The invention further discloses a production method of the aluminum alloy bar. The method includes the flowing steps that an extruded and formed bar semi-finished product is placed for one day and subjected to cold-drawing deformation twice, then kerosene cleaning is performed, and then the aluminum alloy bar is obtained through quenching treatment of heating in a furnace. The produced aluminum alloy bar can have high room temperature mechanical property and cutting property, the bar has no coarse-grain ring, and therefore various properties can reach a standard requirement, and industrial batch production of the aluminum alloy bar is achieved.

Description

Technical field [0001] The invention relates to the field of aluminum alloy production, in particular to a method for producing aluminum alloy rods. Background technique [0002] Aluminum alloy bar is a kind of aluminum alloy cutting material widely used in the aviation field. The production of this aluminum alloy bar generally includes melting, casting, homogenization annealing, extrusion, cold drawing, quenching, straightening, and natural aging treatment. These steps. In the production process of aluminum alloy rods, coarse grain structures, namely coarse crystal rings, are produced. According to the time when the coarse crystal rings appear, they are divided into two categories: the first type is the coarse crystal rings formed during the extrusion process The formation of this kind of coarse crystal ring is due to the uneven metal flow caused by the length of the working belt of the extrusion die and the shape of the entrance and friction. In the reverse extrusion process,...

AI Technical Summary

Problems solved by technology

[0003] Existing technology in extrusion: the chemical composition design of the material is not reasonable enough; the reverse extrusion temperature is too high, reaching 460°C; the reverse extrusion extrusion ratio is too large; the reverse extrusion die working belt is too designed Long; the exit of the extrusion die adopts the cold drawing process after online quenching; when heating, it is heated to high temperature, and the holding time is too long; the above six aspects determine that the extrusion of the aluminum rod will produce coarse grains, and whether it will affect the subsequent processing. Coarse crystals have a direct effect on

Most of the rods produced by the conventional process are fibrous crystal structure, with obvious anisotropy and poor cutting performance