Ultralow-temperature moulding device and method for aluminum and lithium alloy complex curved-surface thin-walled components

Abstract

The invention discloses an ultralow-temperature moulding device and method for aluminum and lithium alloy complex curved-surface thin-walled components. The moulding device comprises a copious coolingtank, a control cabinet, a liquid nitrogen container, a solenoid valve group, a male mould, a female mould, a temperature detector and an edge pressing device; the male mould, the female mould, the temperature detector and the edge pressing device are arranged in the copious cooling tank; the solenoid valve group is arranged on a pipeline which connects the liquid nitrogen container and the copious cooling tank; the solenoid valve group and the temperature detector are both electrically connected to the control cabinet; the edge pressing device is arranged to be capable of pressing a plate blank between the male mould and the female mould; and a tank door is arranged on the copious cooling tank. By adopting a cooling device of the ultralow-temperature moulding device, temperature can be maintained unchanged at any temperature between 0 DEG C to minus 180 DEG C during a moulding process; an ultralow-temperature energy field is provided for the moulding process, so that moulding capability of aluminum and lithium alloy thin plates is greatly improved; deforming is more uniform; thinning and partial corrugating during the moulding process are reduced; and breakage of the components during the moulding process is avoided.

Description

technical field [0001] The invention belongs to the technical field of plate forming, in particular to an ultra-low temperature forming device and method for an aluminum-lithium alloy complex curved surface thin-walled component. Background technique [0002] As one of the six key technologies of aerospace manufacturing, the manufacture of thin-walled parts has always been the focus and difficulty of aerospace structural parts research. Aircraft thin-walled components account for more than 50% of the weight of the whole aircraft structure, need to bear complex loads, and need to meet the service performance requirements of high reliability and long life. For fighter jets, a large number of light-weight and thin-walled parts with excellent performance can further increase the cruising distance and the number of bombs attached to the fighter jets, and improve the combat capabilities of fighter jets. The forming of wall parts places extremely high demands. With the developmen...

AI Technical Summary

Problems solved by technology

However, the multi-scale microstructure formed in the forming and heat treatment process of aluminum-lithium alloy thin-walled parts, including grains, subgrain structure, residual crystal phase and multi-component precipitated phase, its shape and size are difficult to control

In addition, the main alloying element Li, which increases the strength of the material and reduces the density, is prone to dynamic precipitation during the forming process to form a coherent δ′ phase, resulting in coplanar slip, resulting in uneven deformation and local stress concentration.

These reasons lead to the fact that aluminum-lithium alloy complex curved surface components are prone to wrinkling, cracking, poor dimensional accuracy and difficult deformation control in the traditional forming process.

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