Compound molding tool system for hot stretch bending and creep deformation of section bar and application method of compound molding tool system

Abstract

The invention relates to a compound molding tool system for hot stretch bending and creep deformation of a section bar. The compound molding tool system comprises a cantilever-type section bar stretch bender, a heating box, a self-resistance heating system, an electric control cabinet and a clamp, wherein the heating box is located on the working table of the middle part of the cantilever-type section bar stretch bender; the electric control cabinet is located in front of the cantilever-type section bar stretch bender and is connected with the cantilever-type section bar stretch bender; the self-resistance heating system is located at the periphery of the tool system; and the clamp is arranged on a cantilever of the cantilever-type section bar stretch bender. An application method of the compound molding tool system for the hot stretch bending and the creep deformation of the section bar comprises six steps. According to the compound molding tool system for the hot stretch bending and the creep deformation of the section bar, the hot stretch bending process of the creep deformation process of the section bar are compounded; the plastic deformation resistance of the section bar is reduced; and the residual stress after the section bar is processed is reduced, and thereby, resilience is reduced, and the molding precision and the structure stability are improved. Compared with products obtained by adopting a traditional stretch bending method, a final product obtained by the compound molding tool system is higher in quality, and the production efficiency is increased.

Description

technical field [0001] The invention relates to a profile hot stretch bending creep composite forming tooling system and a use method thereof, which are suitable for thermal forming of profiles such as titanium alloys and belong to the technical field of metal thermal processing. Background technique [0002] The profile stretch bending process has been widely used in the manufacture of aircraft and automobile profile bending parts. In aircraft manufacturing, the stretch bending process is mainly used to form skeleton parts such as fuselage, wing, air intake frame, purlin, reinforcing edge; in automobile production, it is mainly used to form hollow profiles of body structure and bumper bending parts, etc. [0003] With the requirements of stealth, high maneuverability and high reliability of the new generation of aircraft, the application of high-strength and lightweight materials such as titanium alloys is increasing, and the requirements for product processing accuracy ar...

AI Technical Summary

Problems solved by technology

[0004] The traditional profile stretch bending process has shortcomings such as the need for multiple sets of tooling, long working hours, and large springback. For example, in the secondary room temperature stretch bending heating correction method for plate bending profiles, the thinning and thickness uniformity of the profile are difficult to control. Requires multiple sets of tooling (stamping upper and lower dies, stretch bending dies, shape-calibration tooling), high cost of tooling; requires multiple processes (hot stamping, two room temperature stretch bending, thermal shape correction), long production cycle, and high cost of working hours

The heat-incremental bending forming heating and shaping process requires repeated heating, and the existence of a large number of stress gradients makes it very difficult to control the forming accuracy of the parts

At the same time, non-uniform deformation leads to a large amount of residual stress, which requires thermal correction treatment. There are many processes and it is difficult to achieve precise forming.

In addition, the existence of residual stress will also cause deformation in the subsequent cutting process, affecting the accuracy of the final part

Profile hot stretch bending heating and shaping process can be used to form low-strength and high-strength titanium alloy profiles, but there are the following problems: the numerical control has not been realized, the precise control of stretching amount and stretching rate cannot be realized, and the forming accuracy is poor; the temperature has not been realized. Closed-loop control, unstable parts organization

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