Diffusion Welding Method of Engine Sealing Structure

A diffusion welding and engine technology, applied in welding equipment, non-electric welding equipment, metal processing equipment, etc., can solve the problems of easy oxidation, drumming, and peeling off blocks of the sealing coating, so as to avoid welding defects and facilitate welding , The effect of optimizing welding conditions

Active Publication Date: 2018-04-03
CHINA HANGFA SOUTH IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The invention provides a diffusion welding method for the sealing structure of the engine to solve the technical problems that the existing sealing coating is prone to oxidation, swelling and peeling off

Method used

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  • Diffusion Welding Method of Engine Sealing Structure
  • Diffusion Welding Method of Engine Sealing Structure
  • Diffusion Welding Method of Engine Sealing Structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Follow the steps below to prepare the engine sealing structure:

[0051] 1. The alloy bushing 200 and the copper-silver-zinc alloy ring 100 are chemically cleaned with hydrochloric acid solution and 40% by volume nitric acid aqueous solution respectively, so as to remove the oxide film and oil stain on the surface of the parts.

[0052] 2. Electroplate a layer of copper on the copper-silver-zinc alloy ring 100 .

[0053] 3. Brush the flow blocking agent on the contact surface between the mandrel 300 and the copper-silver-zinc alloy ring 100, the copper-silver-zinc alloy ring 100 and the block 400, and the contact surface between the alloy bush 200 and the block 400, and put the alloy bush 200 and copper-silver-zinc alloy ring 100 are assembled. The alloy bushing 200 and the copper-silver-zinc alloy ring 100 are interference fit, and the interference fit is 0.03 mm. Both the inner hole of the copper-silver-zinc alloy ring 100 and the taper of the mandrel 300 are 8°.

...

Embodiment 2

[0056] Follow the steps below to prepare the engine sealing structure:

[0057] 1. The alloy bushing 200 and the copper-silver-zinc alloy ring 100 are chemically cleaned with hydrochloric acid solution and 40% by volume nitric acid aqueous solution respectively, so as to remove the oxide film and oil stain on the surface of the parts.

[0058] 2. Electroplate a layer of copper on the alloy bushing 200 .

[0059] 3. Brush the flow blocking agent on the contact surface between the mandrel 300 and the copper-silver-zinc alloy ring 100, the copper-silver-zinc alloy ring 100 and the block 400, and the contact surface between the alloy bush 200 and the block 400, and put the alloy bush 200 and copper-silver-zinc alloy ring 100 are assembled. The alloy bushing 200 and the copper-silver-zinc alloy ring 100 are interference fit, and the interference fit is 0.04 mm. Both the inner hole of the copper-silver-zinc alloy ring 100 and the taper of the mandrel 300 are 10°.

[0060] 4. Inst...

Embodiment 3

[0062] Follow the steps below to prepare the engine sealing structure:

[0063] 1. The alloy bushing 200 and the copper-silver-zinc alloy ring 100 are chemically cleaned with hydrochloric acid solution and 40% by volume nitric acid aqueous solution respectively, so as to remove the oxide film and oil stain on the surface of the parts.

[0064] 2. Electroplate a layer of copper on the copper-silver-zinc alloy ring 100 .

[0065] 3. Brush the flow blocking agent on the contact surface between the mandrel 300 and the copper-silver-zinc alloy ring 100, the copper-silver-zinc alloy ring 100 and the block 400, and the contact surface between the alloy bush 200 and the block 400, and put the alloy bush 200 and copper-silver-zinc alloy ring 100 are assembled. The alloy bushing 200 and the copper-silver-zinc alloy ring 100 are an interference fit, and the interference fit is 0.05 mm. Both the inner hole of the copper-silver-zinc alloy ring 100 and the taper of the mandrel 300 are 12°...

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Abstract

The invention discloses a diffusion welding method for a sealing structure of an engine, which comprises the following steps: pre-preparing a copper-silver-zinc alloy ring according to the size of an alloy liner, plating the alloy liner or the copper-silver-zinc alloy ring with a copper layer and embedding the copper-silver-zinc alloy ring into the alloy liner to form an assembly, wherein the inner ring of the copper-silver-zinc alloy ring is provided with a core rod for pressing the copper-silver-zinc alloy ring to the alloy liner, and the copper-silver-zinc alloy ring and the alloy liner are in interference fit at an interference amount of 0.03-0.05mm; and carrying out diffusion welding on the assembly under the protection of a reducing gas while preserving the temperature at 715-725 DEG C for 180-240min to obtain the sealing structure of the engine. The diffusion welding method for the sealing structure of the engine has the advantages that the elements are welded through diffusion welding, the welding is firm, and the phenomena of oxidation, bubbling and stripping of a copper-silver-zinc abrasion sealing layer are avoided.

Description

technical field [0001] The invention relates to the field of engine sealing, in particular to a diffusion welding method for an engine sealing structure. Background technique [0002] Engine parts will use some lubricating and sealing materials as the sealing and lubricating layer of parts such as blades and grate teeth to improve the working efficiency and service life of parts. In a structure in which the copper-silver-zinc alloy structure 10 is used as the wear seal layer of the alloy bushing 20 (such as the GH600 superalloy bushing), see figure 1 , The sealing grate teeth scrape and rub against the copper, silver and zinc wear sealing layer during the rotation process, so as to play the role of lubrication and sealing. [0003] The existing copper-silver-zinc wear seal layer usually adopts the alloy bushing 20 that is directly sprayed with copper-silver-zinc alloy powder by thermal spraying. . The coating processed by spraying process should not be too thick, and the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K20/02
CPCB23K20/026
Inventor 张明敏吴家云冯小珍
Owner CHINA HANGFA SOUTH IND CO LTD
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