Liquid die forging and rolling composite forming method for 6082 aluminum alloy large rings with different cross-sections

Abstract

The invention discloses a liquid die-forging and rolling composite forming method for a 6082 aluminum alloy special-section large ring piece. The method comprises the following steps of: 1) smelting; 2) performing liquid die-forging, namely fixing a die-forging die on an indirect extrusion casting machine, and pouring an alloy solution into the die-forging die at the pouring temperature of between 650 and 680 DEG C under the pressurization speed of between 35 and 40 mm / s, wherein the filling time is 1 to 6 seconds, and the specific pressure is 100 to 150 MPa; and keeping the pressure of between 100 and 150 MPa for 35 to 60 seconds, and thus obtaining a similar final section ring blank; 3) homogenizing, cooling the similar final section ring blank to the temperature of 550 DEG C, and keeping the temperature for 6 hours; 4) performing afterheat isothermal rolling, namely cooling the homogenized similar final section ring blank to the temperature of between 450 and 480 DEG C, and performing isothermal rolling on a radial shaft composite ring rolling machine; 5) performing thermal treatment, namely keeping the temperature of the ring blank at 525 DEG C for 1 hour, quenching in the water, rising the temperature to 165 DEG, and keeping the temperature for 12 hours; and 6) performing fine adjustment.

Description

technical field [0001] The invention relates to a short-process processing and forming method for large-diameter metal rings with complex cross-sections, in particular to a liquid die forging and rolling composite forming method for large-scale rings with different cross-sections of 6082 aluminum alloy. Background technique [0002] With the rapid development of my country's aerospace industry, high-thrust launch vehicles are in urgent need of large-scale complex-section aluminum alloy rings with a diameter of more than 5 meters. The so-called complex cross-section ring refers to a metal ring with a large difference in the cross-sectional area of ​​the ring in the axial direction, a large change in the shape and size of the cross-section of the ring, and a relatively complex shape of the inner surface and the outer surface. An important part of the success of a rocket project is the key connector of the launch vehicle. The special use environment puts forward almost strict ...

AI Technical Summary

Problems solved by technology

[0004]1) The process is lengthy, with many procedures and low production efficiency;

[0005]2) The rolled and expanded ring blank needs to be prepared by punching, and the final cross-sectional shape needs to be guaranteed by cutting excess dressing, so the material utilization rate is low;

[0006]3) The machining process cuts off the metal flow line, resulting in a decrease in the comprehensive mechanical properties of the ring;

[0007]4) The preparation process requires repeated heating, resulting in coarse grains, severe surface oxidation, and large energy consumption

[0008]The Chinese patent with the publication number CN 101817134A discloses a method for short-flow casting-rolling composite forming of metal rings. Although the method satisfies the beneficial effect of short production process and saving energy, materials and manpower to a certain extent, the method adopts centrifugal casting ring billet, which cannot meet the processing requirements of complex cross-section rings, and the comprehensive mechanical properties of the metal rings obtained are The performance is still not up to the use requirements of launch vehicles