Production process of 2-series aluminum alloy thin-wall profile machining part

Abstract

The invention belongs to the field of aluminum alloy preparation and relates to a production process of a 2-series aluminum alloy thin-wall profile machining part. The machining part is a thin-wall profile and comprises steps that aluminum alloy is proportioned according to a certain mass percent; the prepared aluminum alloy is smelted, degassing and deslagging are thorough, and an aluminum alloycast ingot with qualified components and structures is cast; the aluminum alloy cast ingot is extruded at an extrusion ratio of 9 / 1 to obtain an aluminum alloy thin-wall profile; the aluminum alloy thin-wall profile is subjected to solution treatment, the solution temperature is freely increased to 485 DEG C, heat preservation is conducted for 3 h, then the temperature is increased to 505 DEG C atthe heating speed of 10 DEG C / h, heat preservation is conducted for 15-18 min, and the aluminum alloy thin-wall profile subjected to solution treatment is quenched through mixed liquid. The method isadvantaged in that the reinforced solid solution with relatively higher temperature is adopted, so performance of the material is facilitated, the size and quantity of the second phase can be greatlyreduced, the structure is more uniform, and mechanical property of the material is improved.

Description

technical field [0001] The invention belongs to the field of aluminum alloy preparation, and relates to a production process of a 2-series aluminum alloy thin-wall profile processing part. Background technique [0002] As a typical Al-Cu alloy, the 2-series aluminum alloy has high strength, good forgeability, and good heat resistance, so it is widely used in aerospace and other fields. After the alloy is treated by solution quenching, aging and other processes, it can obtain better working performance. The traditional solution temperature is lower than the non-equilibrium eutectic melting point, so the coarse compound phase cannot be completely dissolved, but increasing the solution temperature and prolonging the solution time will lead to increased recrystallization and grain growth, which will affect the mechanical properties of the alloy. The performance is unfavorable, therefore, it is necessary to improve the solid solution process to make the alloy achieve better mech...

AI Technical Summary

Problems solved by technology

Quenching of 2-series aluminum alloys has the disadvantages of high quenching sensitivity, fast cooling speed, too long film boiling stage, low wetting speed and difficult control, especially when high-precision machined parts and thin-walled aluminum alloy profiles are quenched with water , the quenching deformation of the parts is serious, the follow-up correction is very difficult, even difficult to correct, and the parts are scrapped due to out-of-tolerance, causing huge economic losses, so optimizing and improving its quenching process is of great significance

At the same time, the corrosion resistance of 2-series aluminum alloy is poor, but because the intergranular corrosion occurs inside the grain, it is not easy to detect and suddenly causes the structure of the component to break, and even causes more serious accidents. Therefore, it is of great significance to eliminate or improve the intergranular corrosion of the alloy.

Images