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Heat treatment process method of complex curved surface closed inner cavity part

A process method and complex curved surface technology, which is applied in the field of heat treatment of complex curved surface closed inner cavity parts, can solve the problems of not being able to meet the heat treatment quality control requirements of closed inner cavity parts at the same time, and achieve low production cost, high efficiency, and small heat treatment deformation Effect

Inactive Publication Date: 2020-03-06
CHENGDU AIRCRAFT INDUSTRY GROUP
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0006] In order to prevent oxidation, decarburization and control heat treatment deformation, according to the technical requirements of the workpiece, protective atmosphere heat treatment and vacuum heat treatment are often used for production, but after actual heat treatment production, the above heat treatment methods cannot simultaneously meet the requirements of such large complex curved surface closed cavity parts Heat treatment quality control requirements

Method used

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with embodiment.

[0025] The present invention relates to a process method for heat treatment of parts with a complex curved surface closed inner cavity, the steps of which are as follows:

[0026] Parts inspection: check the size of the parts and the quality of the inner and outer surfaces.

[0027] Brush paint: apply heat treatment protective paint to the upper and lower inner chambers.

[0028] Welding: Weld the upper and lower parts, weld the Φ10×1.0mm vent pipe at the bottom, and proceed to step 5) within 120 minutes after welding.

[0029] Inflatable protection: use the Φ10×1.0mm vent tube to fill the inner cavity with high-purity argon.

[0030] Stress Relief Tempering: Heat to 680°C, hold for 100-120 minutes, and air cool.

[0031] Quenching: Heating to 650°C, heat preservation for 100-120 minutes, transfer to 900°C electric furnace, heat preservation for 100-120 minutes, then transfer to n...

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Abstract

The invention provides a heat treatment process method of a complex curved surface closed inner cavity part. A part inner cavity is coated with a heat treatment protective coating; stress tempering isconducted; an air pipe is connected to the bottom of the part inner cavity; the outer surface is coated with a heat treatment protective coating; the inner cavity is filled with argon through the airpipe for protection; preheating is conducted; isothermal quenching is conducted; and tempering is conducted. The heat treatment process method meets requirements of oxidation, decarburization and heat treatment deformation during heat treatment of a large complex curved surface closed inner cavity part. Compared with a vacuum heat treatment process, the heat treatment process method has the advantages of low production cost, high efficiency, small heat treatment deformation and the like.

Description

technical field [0001] The invention relates to the technical field of heat treatment, in particular to a heat treatment method for parts with complex curved surfaces and closed inner cavities. Background technique [0002] During the heat treatment of workpieces, the most common defects are oxidation, decarburization and heat treatment deformation. [0003] Oxidation is a process in which iron on the steel surface interacts with oxygen, oxidizing gases, and oxidizing impurities in the heating medium to form iron oxide. Oxidation of steel is a chemical reaction. After an oxide film appears on the surface of steel, the oxidation rate mainly depends on the diffusion rate of oxygen and iron atoms through the oxide film. As the heating temperature increases, the atomic diffusion rate increases, and the oxidation rate of steel increases sharply, especially above 570°C, the formed oxide film is mainly FeO, which is not dense and has a loose structure. , Therefore, the oxygen ori...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/70C21D1/20C21D9/00
CPCC21D1/20C21D1/70C21D9/0068
Inventor 娄志强孔德权杨屹刘谨怡
Owner CHENGDU AIRCRAFT INDUSTRY GROUP
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