Electromagnetic auxiliary stamping incremental forming process for thin-wall curved-surface light alloy component

Abstract

The invention relates to an electromagnetic auxiliary stamping incremental forming process for a thin-wall curved-surface light alloy component. The electromagnetic auxiliary stamping incremental forming process comprises the following steps that S1, solid solution aging treatment is conducted on a light alloy plate; S2, the light alloy plate is subjected to pre-stamping, and the pre-stamping deformation amount is 10%-30% of the total deformation amount; and S3, a forming coil is used for discharging to form pulse Lorentz force, the plate obtained after pre-stamping deformation is impacted, multi-pass electromagnetic incremental forming is carried out, and final forming of the thin-wall curved-surface light alloy component is completed. The sequence of the step S1 and the step S2 can be interchanged. The large thin-wall curved-surface component manufactured through the electromagnetic auxiliary stamping incremental forming process for the thin-wall curved-surface light alloy component is good in formability, high in precision and excellent in surface quality, and the comprehensive mechanical property is greatly improved.

Description

technical field [0001] The invention relates to the field of light alloy forming and manufacturing, and more specifically relates to an electromagnetic-assisted stamping progressive forming process for a thin-walled curved surface light alloy component. Background technique [0002] The launch vehicle is an indispensable tool for human beings to carry out space activities such as lunar exploration projects, space station construction, and deep space exploration. The diameter of the fuel tank directly determines the carrying capacity of the rocket, and for the launch vehicle, the economic benefit obtained by reducing the weight by 1kg is nearly 100,000 US dollars. Therefore, the demand for high-performance lightweight materials and large thin-walled lightweight structures for the bottom parts of rocket fuel tanks known as the "rocket crown" is becoming more and more urgent. High-strength lightweight alloys (represented by aluminum alloys, titanium alloys, magnesium alloys, e...

AI Technical Summary

Problems solved by technology

However, light alloy materials have poor formability at room temperature and are difficult-to-form materials; large thin-walled curved parts such as rocket fuel tank bottoms have poor structural rigidity and are difficult-to-form structures

[0003] Aiming at the difficulties in manufacturing the bottom parts of rocket fuel storage tanks, one of the technical solutions adopted in the prior art is "tailored welded thick plate + hot spinning + CNC milling", but there are complex processes, long manufacturing cycles, and serious waste of materials (waste rate above 90%) and other issues

The second technical solution adopted in the prior art is: split forming→aging treatment→welding→milling. In actual operation, this process needs to change the forming equipment and heat treatment equipment many times, and the melon petals have poor plasticity and large springback. It makes the welding of melon parts difficult and the internal stress after welding is large, resulting in problems such as poor dimensional accuracy, high rejection rate, and low reliability.

Although the spinning forming and internal high pressure forming methods can realize integral forming, the spinning process is prone to defects such as cracking and wrinkling, and there are complex process control, large residual stress after spinning, and significant residual deformation after quenching, etc. Problem; while internal high pressure forming has extremely high requirements on the tonnage of the hydroforming machine and the tightness of the high-pressure liquid. At present, the maximum diameter that can be formed is about 3m, which limits its application in large curved surface components.

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