Liquid die forging and rolling compound formation method for aluminum alloy irregular-section large ring piece

Abstract

The invention discloses a liquid die forging and rolling compound formation method for an aluminum alloy irregular-section large ring piece. The method comprises the following steps of: smelting, performing liquid die forging, homogenizing, performing afterheat isothermal rolling, performing thermal treatment and finishing, wherein the step of performing liquid die forging comprises the following substeps of: fixing a liquid die forging mold on an indirect extrusion casting machine, pouring a quantitative amount of aluminum alloy solution obtained through smelting into the liquid die forging mold at the pouring temperature of between 650 and 730 DEG C, pressurizing at the speed of 35 to 40 mm / s, filling for 1 to 6 seconds at the specific pressure of 100 to 200 MPa, keeping the pressure for 35 to 60 seconds, and thus obtaining a similarly final section ring blank; and the step of performing afterheat isothermal rolling comprises the following substeps of: cooling the homogenized similarly final section ring blank to the temperature of between 430 and 480 DEG C, and performing afterheat isothermal rolling on a radial shaft compound ring rolling machine. According to the liquid die forging and rolling compound formation method for the stainless steel irregular-section large ring piece, the flow of a blank preparation process for an aluminum alloy ring piece can be simplified, the cost can be reduced, and the production efficiency can be improved; and furthermore, the microstructure state of the aluminum alloy ring piece can be effectively improved, and the comprehensive mechanical performance is improved.

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 of aluminum alloys with different cross-sections. 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 requ...

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