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Synchronous diffusion bonding method for super-plastic formation of aluminum alloy

A diffusion joining and superplastic forming technology, applied in welding equipment, metal processing equipment, welding/welding/cutting items, etc., can solve the problems of long preparation cycle, low economic benefit, and reduced material mechanical properties, etc. The effect of shortening cycle time, reducing manufacturing cost and improving structural integrity

Active Publication Date: 2021-04-09
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the aluminum alloy superplastic forming diffusion bonding process in the prior art needs to process the aluminum alloy plate through two heat cycles, the mechanical properties of the material are greatly reduced, and the preparation period of the test piece is longer, and the economic benefit is not high. problems, and then provide a method of diffusion bonding of aluminum alloy synchronous superplastic forming;

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  • Synchronous diffusion bonding method for super-plastic formation of aluminum alloy
  • Synchronous diffusion bonding method for super-plastic formation of aluminum alloy
  • Synchronous diffusion bonding method for super-plastic formation of aluminum alloy

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specific Embodiment approach 1

[0037] Specific implementation mode one: refer to Figure 1 to Figure 8 To illustrate this embodiment, this embodiment provides a diffusion bonding method for synchronous superplastic forming of an aluminum alloy, which is characterized in that: the method is realized through the following steps:

[0038] Step 1: Mold making: Design the size of the upper and lower molds according to the appearance shape and size requirements of the target test piece;

[0039] Step 2: Blank processing: According to the size requirements of the test piece, cut the aluminum alloy plate and perform degreasing treatment;

[0040] Step 3: Apply solder resist in the superplastic bulging area of ​​the cleaned billet: remove the scale of the billet in the glove box, and apply low-temperature vaporized solder resist in the superplastic bulging area of ​​the billet. The solder resist is made of titanium dioxide, Composition of epoxy resin, styrene-benzene nitrile copolymer;

[0041] Step 4: Carry out w...

specific Embodiment approach 2

[0047] Specific implementation mode two: refer to Figure 1 to Figure 8 Describe this embodiment, this embodiment is to further limit the step one described in the specific embodiment one, in this embodiment, the upper and lower dies in the step one are all made of stainless steel materials, and the upper and lower dies are respectively processed with mutual Corresponding edge grooves, temperature measuring holes and support holes, and positioning holes are processed on the upper mold, and positioning pins are welded on the lower mold corresponding to the positioning holes. Other compositions and connection methods are the same as those in Embodiment 1.

[0048] In this embodiment, the edges of the two aluminum alloy plates can be effectively wrapped by the edge sealing groove, so as to avoid the mold clamping being affected by the thickness of the wax seal, and the temperature measuring hole is convenient for observing the temperature change inside the mold after mold clampin...

specific Embodiment approach 3

[0049] Specific implementation mode three: refer to Figure 1 to Figure 8 Describe this embodiment. This embodiment is to further limit the second step in the second specific embodiment. In this embodiment, when cutting the aluminum alloy plate in the second step, it is necessary to compensate for the 5-10mm process according to the size of the final product. The remaining amount, and use 400 mesh, 800 mesh and 1500 mesh sandpaper to mechanically grind and polish the surface of the cut aluminum alloy billet in sequence, and then place the polished aluminum alloy billet in an acetone solution for ultrasonic cleaning for 30 minutes, Remove oil stains on aluminum alloy surfaces. Other compositions and connection methods are the same as those in the second embodiment.

[0050] In this embodiment, the selection category of sandpaper is from 400 mesh to 1500 mesh. Generally, three types of sandpaper are selected from coarse to fine for mechanical grinding and polishing. The number ...

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Abstract

The invention discloses a synchronous diffusion bonding method for super-plastic formation of aluminum alloy, belongs to the technical field of plastic processing of metals, and aims to solve the problems that in the prior art, a diffusion bonding process for super-plastic formation of aluminum alloy needs two times of thermal cyclic processing on an aluminum alloy plate, the mechanical property of the material is greatly reduced, the preparation period of a test piece is long, and the economic efficiency is not high. According to a key process of the synchronous diffusion bonding method provided by the invention, a super-plastic forming area of an aluminum alloy plate is coated with a specific solder resist; the solder resist is gasified after being heated to provide pneumatic power in a super-plastic expansion process; and during super-plastic formation, atoms on the surface of the aluminum alloy plate in a diffusion bonding area are diffused mutually, and thus a diffusion joint with a good performance is obtained. According to the synchronous diffusion bonding method provided by the invention, an aluminum alloy complex hollow component with an accurate size and a high specific strength is prepared in one thermal cycle, the preparation procedure and time are greatly shortened, and the integrity of a structural component is improved.

Description

technical field [0001] The invention belongs to the technical field of metal plastic processing, and in particular relates to a diffusion connection method for synchronous superplastic forming of aluminum alloys. Background technique [0002] Aluminum alloys have the advantages of low density, high specific strength and specific stiffness, good heat resistance, and superior superplastic formability, and have been widely used in aircraft skins, partitions, and spacecraft cryogenic tanks. The superplastic forming / diffusion bonding combined process is mainly used for forming two or more layers of plates, and can obtain hollow structural parts with complex curved surfaces. [0003] At present, the preparation of complex curved hollow structural parts of aluminum alloy through superplastic forming diffusion bonding process is usually carried out step by step in vacuum equipment. First, the diffusion bonding process is performed in one thermal cycle, and then the specimen is super...

Claims

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Application Information

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IPC IPC(8): B23K20/02B23K20/24B23K20/26
CPCB23K20/026B23K20/24B23K20/26B23K2103/10
Inventor 王国峰刘永康陈玉清康庆鑫骆姝伊
Owner HARBIN INST OF TECH
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