A small-angle torsion method for equal-section hollow fan blades based on stress relaxation

Abstract

The invention discloses a uniform section hollow fan blade small-angle turning-around method based on stress relaxation. The uniform section hollow fan blade small-angle turning-around method based onstress relaxation comprises the steps that a high-temperature stress relaxation test method is adopted to acquire a stress relaxation curve of a blade material at the different temperatures and different initial strain conditions, and the forming temperature and the stress relaxation time are determined according to the deformation amount of a blade after the blade is turned around; a clamping and turning-around device is designed according to the cross-section shape of the blade and the turning-around angle of the blade; at the room temperature, the blade is turned around to the final forming angle through the clamping and turning-around device cooperating with the two ends of the hollow blade; the clamped blade and the clamping and turning-around device are moved into a heating device,the blade is heated to the designed stress relaxation temperature, and the designed stress relaxation temperature is kept for designed relaxation time; and heating is stopped, the blade is taken out after cooling, and the clamping and turning-around device is dismounted. By means of the uniform section hollow fan blade small-angle turning-around method based on stress relaxation, an existing high-temperature turning-around forming device and process are simplified, and turning-around forming is carried out on the hollow fan blade through a high-temperature stress relaxation method.

Description

technical field [0001] The invention belongs to the technical field of torsion of hollow fan blades, and specifically refers to a small-angle torsion method of equal-section hollow fan blades based on stress relaxation. Background technique [0002] The hollow blade can reduce the weight of the blade itself and improve work efficiency. At the same time, the linear shape of the blade needs to be designed according to the gas flow requirements, and often has a certain torsional bending angle. [0003] At present, the common torsion forming process of equal-thickness solid blades is to clamp the blades by torsion fixtures, fix the blades with tenons, and realize the torsional deformation of the blade body through the rotation of the chucks. Aiming at the high-temperature torsional bending forming of titanium alloy hollow blades with variable thickness, Chinese invention patent application numbers CN201310508213.0 and CN201320660835.0 propose a hollow blade push-bending forming...

AI Technical Summary

Problems solved by technology

[0006] Aiming at the deficiencies of the above-mentioned prior art, the purpose of the present invention is to provide a small-angle torsion method for hollow fan blades with equal cross-section based on stress relaxation, so as to solve the impact of springback and the torsion angle caused by the forming method at room temperature in the prior art. Difficult to control precisely

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