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Millimeter-wave waveguide antenna precision diffusion welding method

A waveguide antenna and diffusion welding technology, applied in the field of material welding, can solve the problems of inability to meet the high precision requirements of millimeter wave waveguides, and achieve the effects of improving welding efficiency, improving electromagnetic characteristics, roughness and dimensional consistency.

Active Publication Date: 2021-02-23
CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Using the existing diffusion welding method to weld the millimeter-wave waveguide, the general deformation in the height direction is 3% to 5%, so it is inevitable to cause a large deformation of the waveguide cavity, about 0.3mm to 0.5mm, which cannot meet the high-precision requirements of the millimeter-wave waveguide.

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  • Millimeter-wave waveguide antenna precision diffusion welding method

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Embodiment 1

[0045] In an embodiment, the millimeter-wave waveguide antenna is made of 3A21 aluminum alloy material, and the parts of each layer of the waveguide antenna are made of aluminum alloy material through precision numerical control processing, and the surface roughness is less than 0.4 μm. The welding surface of the two-layer parts is designed with a mortise and tenon structure to ensure assembly accuracy. The dimensional tolerance of the inner wall of the concave structure is 0 ~ +0.01mm, and the dimensional tolerance of the outer wall of the convex structure is -0.01mm ~ 0mm.

[0046] Millimeter wave waveguide antenna precision diffusion welding method, the steps are as follows

[0047] S1, use chemical cleaning to clean the surface of the parts and remove the oxide film on the welding surface.

[0048] S2, within 6 hours the parts are assembled and loaded into the vacuum furnace.

[0049] S3, setting process parameters, consists of the following stages. The first stage is th...

Embodiment 2

[0057] In the embodiment, the millimeter-wave waveguide antenna is made of 6063 aluminum alloy material, and the parts of each layer of the waveguide antenna are made of aluminum alloy material through precision numerical control processing, and the surface roughness is less than 0.4 μm. The welding surface of the two-layer parts is designed with a mortise and tenon structure to ensure assembly accuracy. The dimensional tolerance of the inner wall of the concave structure is 0 ~ +0.01mm, and the dimensional tolerance of the outer wall of the convex structure is -0.01mm ~ 0mm.

[0058] Millimeter wave waveguide antenna precision diffusion welding method, the steps are as follows

[0059] S1, use chemical cleaning to clean the surface of the parts and remove the oxide film on the welding surface.

[0060] S2, within 6 hours the parts are assembled and loaded into the vacuum furnace.

[0061] S3, setting process parameters, consists of the following stages. The first stage is t...

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Abstract

The invention discloses a millimeter-wave waveguide antenna precision diffusion welding method. A millimeter-wave waveguide antenna is made of an aluminum alloy material and comprises two parts to bewelded into a whole. The millimeter-wave waveguide antenna precision diffusion welding method comprises the steps that the surfaces of the parts are cleaned to remove an oxide film on the welding surface; the parts are assembled and placed into a vacuum furnace; and technological parameters are set, and welding machining is conducted, wherein the welding machining sequentially comprises a temperature rising stage, a temperature equalizing stage, a high-pressure stress film-breaking stage, a medium-pressure stress deformation welding stage, a low-pressure stress welding stage and a cooling stage; According to the method, different technological parameters are designed in different stages of aluminum alloy diffusion welding, coupling optimization of a diffusion welding quality result and a structural deformation result of the aluminum alloy waveguide antenna is realized, the weld strength is 75% higher than a base metal, waveguide cavity deformation does not exceed 0.05mm, and high-precision diffusion welding of the aluminum alloy waveguide antenna is realized.

Description

technical field [0001] The invention relates to the technical field of material welding, in particular to a precision diffusion welding method for a millimeter-wave waveguide antenna. Background technique [0002] Millimeter wave radar has the characteristics of high resolution and small size, and is the development direction of the new generation of radar. Among them, the millimeter-wave waveguide is the key structure of the millimeter-wave radar, and its waveguide cavity is the transmission channel of the millimeter-wave. Due to the short wavelength of the millimeter wave, the dimensional accuracy and roughness of the waveguide cavity are extremely demanding, otherwise the millimeter wave attenuation will be serious and the system specifications will be affected. At present, the dimensional accuracy of the millimeter-wave waveguide cavity requires ±0.05mm, and the roughness does not exceed 0.8um. [0003] The main welding method of conventional waveguides is vacuum brazi...

Claims

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Application Information

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IPC IPC(8): B23K20/00B23K20/14B23K20/24
CPCB23K20/001B23K20/14B23K20/24
Inventor 方坤宋奎晶李敏高乾坤牛利民鲁斌殷东平付庆霞
Owner CHINA ELECTRONIC TECH GRP CORP NO 38 RES INST
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