Uniform section hollow fan blade small-angle turning-around method based on stress relaxation

A fan blade and stress relaxation technology, which is applied in the field of small-angle twist of cross-section hollow fan blades, can solve the problems of difficult to control the twist angle accurately and the effect of springback, and achieve the effect of stable forming products, avoiding movement and easy control.

Active Publication Date: 2018-02-09
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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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-s...

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  • Uniform section hollow fan blade small-angle turning-around method based on stress relaxation
  • Uniform section hollow fan blade small-angle turning-around method based on stress relaxation
  • Uniform section hollow fan blade small-angle turning-around method based on stress relaxation

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Embodiment Construction

[0027] In order to facilitate the understanding of those skilled in the art, the present invention will be further described below in conjunction with the embodiments and accompanying drawings, and the contents mentioned in the embodiments are not intended to limit the present invention.

[0028] refer to figure 1 As shown, a small-angle torsion method of equal-section hollow fan blades based on stress relaxation of the present invention includes the following:

[0029] 1) Construct the blank model and finished product model of the hollow fan blade with equal cross-section, that is, the model of the blade before and after forming; see Figure 3a , wherein, 15 is the torsion-shaped front blade, and 16 is the torsion-shaped rear blade.

[0030] 2) Extract the cross-sectional curve of the blade head end before and after the blade torsion forming, and calculate the blade torsion angle; import the blank model and the finished product model of the equal-section hollow fan blade bef...

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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...

Claims

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Application Information

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IPC IPC(8): B21D11/10B21D37/16B21D53/78
CPCB21D11/10B21D37/16B21D53/78
Inventor 陈明和王宁谢兰生吴荣华叶建华
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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