High-temperature creep forming tooling for large cross-section titanium alloy profile and its application method

Abstract

The invention discloses a large-section titanium alloy profile high-temperature creep forming tooling and a method for using the same. Aiming at the problem of uneven high-temperature creep temperature after bending and forming of a special-shaped large-section titanium alloy curved surface member, it uses infrared temperature measurement closed-loop control, multiple Layer insulation structure, radiation heating insulation unit, the application of insulation structure, radiation heating mold, preheating plate and insulation cushion can effectively reduce the contact exchange with the mold during the creep process of complex special-shaped large-section titanium alloy curvature components. Heat and convective heat exchange with the outside world, improve the temperature unevenness in the arc length direction and cross-section of complex and special-shaped large-section titanium alloy profiles, so as to realize the stress relaxation of titanium alloy profiles in tension and compression stress states at high temperatures, and ensure profiles in a temperature-balanced environment Under high temperature creep, the forming accuracy of the profile is improved, which lays a solid foundation for the subsequent cutting process design.

Description

technical field [0001] The invention relates to the technical field of thermoforming of metal profiles, in particular to a tool for high-temperature creep forming of large-section titanium alloy profiles and a method for using the same. Background technique [0002] In order to achieve the goals of long life and high performance in the new generation of large wide-body aircraft and military transport aircraft at home and abroad, the overall structure of carbon fiber reinforced composite materials has been more applied. Since titanium alloy has the characteristics of high specific strength, high temperature resistance and corrosion resistance, and has good potential compatibility and impact resistance when assembled with composite material wall panels, the use of titanium alloy curved surface frames to replace traditional aluminum alloy frames and composite materials The whole wall panel is assembled. In addition, in order to reduce the assembly error of the fuselage and imp...

AI Technical Summary

Problems solved by technology

This extremely uneven temperature gradient will lead to uneven stress attenuation during the creep process of the profile, which will affect the forming accuracy of the curvature component and the efficiency and quality of the subsequent cutting process.

[0004] Existing profile insulation tooling is mainly designed for stretch bending and creep of profiles with small cross-sections and simple geometric features, and cannot well take into account the complex and special-shaped large-radius, large-wrapped-angle and large-section profiles during the creep process. Uniform current density, contact heat transfer with the outside world, and convective heat transfer lead to severe temperature differences between the inside and outside of the profile

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