Wide chord blade machining method

A processing method and blade technology, applied in the processing field of wide chord blades, can solve the problems of increasing the risk of cracking, unable to improve, and difficult to guarantee the uniformity and reliability of the truss.

Active Publication Date: 2020-10-30
陕西智拓固相增材制造技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main problem of this process is: if the vacuum inner cavity is to be formed, the inner cavity of the blade needs to be evacuated after forming and sealed by welding. risk of cracking
In addition, the above process method also has the following problems: (1) Since the blade has a certain shape structure, the deformation required by each part of the inner cavity truss during the overspeed process is inconsistent, and the uniformity and reliability of the truss are difficult to guarantee; ( 2) The SPF / DB process requires a certain diffusion weld length and wall plate thickness, so that the limit hollow rate of the blade is 40%, which cannot be improved; (3) There are many process factors involved in the forming process, and the control is very difficult and complicated, resulting in parts The quality fluctuates greatly, and the accuracy is difficult to guarantee

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] This embodiment provides a processing method for wide-chord blades, comprising the following steps:

[0051] The titanium alloy forging material is cut into two sheets. The size of the sheet is 20mm allowance on each side of the final length and width direction of the blade, and 5mm allowance on each side of the thickness direction. The surface roughness Ra<0.8μm is achieved by milling. On the welding surface of the sheet metal, the inner cavity structure of the blade is processed to a hollow rate of 60%. The inner cavity adopts a support rib structure, the rib width is greater than 1mm, and the cavity shape is a blade-shaped cavity. Use hydrochloric acid to clean the surface of the two processed plates to remove the surface oxide film.

[0052] Such as Figure 4 As shown, the two cleaned sheets are butted and assembled according to the drawing, and then put into a diffusion welding furnace, vacuumed and heated to a diffusion welding temperature of titanium alloy of ab...

Embodiment 2

[0055] This embodiment provides a processing method for wide-chord blades, comprising the following steps:

[0056] The titanium alloy forging material is cut into two sheets, and the surface roughness Ra<0.8 μm is obtained by milling. On the welding surface of the sheet metal, the inner cavity structure of the blade is processed to a hollow rate of 50%. Use hydrochloric acid to clean the surface of the two processed plates to remove the surface oxide film.

[0057] Such as Figure 4 As shown, the two cleaned sheets are butted and assembled according to the drawing, and then put into a diffusion welding furnace, vacuumed and heated to a diffusion welding temperature of titanium alloy of about 950°C, and then the workpiece is pressurized to 10MPa and kept warm 240min, and finally cooled to room temperature with the furnace to form a blade blank with a vacuum inner cavity.

[0058] Take out the blade blank, process and thin its two sides to be close to the final wall thicknes...

Embodiment 3

[0060] This embodiment provides a processing method for wide-chord blades, which is different from Embodiment 1 only in the parameter control of the following steps:

[0061] The operating pressure in the vacuum diffusion welding process is 3MPa, and the operating pressure in the primary hot pressing forming and secondary hot pressing forming processes is 1MPa.

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Abstract

The invention discloses a wide chord blade machining method, and relates to the technical field of wide chord blades. The wide chord blade machining method includes the steps that blade inner chamberstructures are machined on welded faces of two plates to be welded respectively, then the welded faces with inner chambers of the plates to be welded are closed and assembled to form base materials tobe welded, and blade billet with a vacuum inner chamber is formed after the base materials to be welded are subjected to vacuum diffusion welding. Many abuses brought in a superplastic forming process can be prevented, and particularly, blades can be effectively prevented from cracking at the same time when the vacuum inner chamber is formed, and the mechanical strength of a welding seam can be improved to some extent.

Description

technical field [0001] The invention relates to the technical field of wide-chord blades, and in particular to a processing method for wide-chord blades. Background technique [0002] Before the 1960s, the fan and compressor blades of aviation turbofan engines generally adopted a narrow chord design with 1 to 2 rows of shoulders. These shoulders cause pressure loss, flow restriction and airflow turbulence, increasing the fuel consumption of the engine. Therefore, people began to carry out research on removing the shoulder of the blade, and found that the chord length of the blade needs to be increased by 40% to 45% to ensure aerodynamic stability, and the number should be reduced by 1 / 3, so the wide-chord blade was invented on this basis. At present, titanium alloy wide-chord fan blades are still mainly used in the third and fourth generation fighter engines and civil aero engines. [0003] The wide-chord blade is a blade with a relatively small aspect ratio. Its character...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23P15/02
CPCB23P15/02
Inventor 张昊孙福邵长斌王桂龙王莉敏王蒙蒙
Owner 陕西智拓固相增材制造技术有限公司
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