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Hole extrusion strengthening method for aluminum alloy thick plate and lubricant for method

A lubricant and aluminum alloy technology, applied in the field of aluminum alloy thick plate hole extrusion strengthening, lubricants, can solve the problems of reduced extrusion strengthening effect, scratched hole wall, high extrusion amount, etc., to achieve excellent wear reduction Anti-wear performance, guarantee effect, and effect of improving production efficiency

Active Publication Date: 2021-06-18
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the actual production process, due to the high extrusion volume required for the hole extrusion strengthening process and the high extrusion force used, it is often unavoidable that the hole wall is scratched or the hole wall-extrusion rod is bonded, which seriously reduces the The effect of extrusion strengthening

Method used

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  • Hole extrusion strengthening method for aluminum alloy thick plate and lubricant for method
  • Hole extrusion strengthening method for aluminum alloy thick plate and lubricant for method
  • Hole extrusion strengthening method for aluminum alloy thick plate and lubricant for method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0093] Prepare lubricant.

[0094] The first lubricant comprises the following components in parts by mass:

[0095] 30 parts of flake graphite, 15 parts of tungsten disulfide, 22 parts of polyimide, 68 parts of epoxy resin, 80 parts of ethanol and 10 parts of xylene.

[0096] The second lubricant comprises each component of following mass parts:

[0097] 20 parts of flake graphite, 10 parts of tungsten disulfide, 22 parts of polyimide, 68 parts of epoxy resin, 80 parts of ethanol and 10 parts of xylene.

[0098] According to the raw material composition of the lubricant, epoxy resin and polyimide are dissolved in a solvent, then flake graphite and tungsten disulfide are added and ultrasonically dispersed to obtain a uniformly dispersed lubricant.

[0099] The lubricant of the embodiment of the present invention has the advantages of high load resistance, low friction coefficient, high toughness, high and low temperature resistance, etc., and also has excellent curing perfor...

Embodiment 2

[0102] Hole extrusion strengthening of 7050 aluminum alloy thick plate includes the following steps:

[0103] 1) Hole to be strengthened: the hole diameter is 10mm, the surface finish of the hole wall is Ra1.6, and the extrusion amount is 1%.

[0104] 2) Coat the first lubricant of Example 1 on the hole wall of the hole to be strengthened, and after the first lubricant is solidified and dried, a first anti-friction coating with a thickness of 60 μm is formed; in the first anti-friction coating The second lubricant of Example 1 was coated on the layer, and the second lubricant was solidified and dried to form a second friction-reducing coating with a thickness of 50 μm.

[0105] 3) According to the HB / Z 170-2005 "Hole Extrusion Strengthening of Aeronautical Parts" standard, the hole to be strengthened is extruded and strengthened: insert the tapered metal core rod (extrusion rod) into the hole to be strengthened, and the metal core rod Mechanical pressure is applied at the end...

Embodiment 3

[0107]Example 3 is basically the same as Example 2, except that in step 2), a commercially available graphite dry film for hole extrusion with a graphite mass fraction of 20% is used to replace the first lubricant, and after drying, a graphite film with a thickness of 60 μm is formed. For the anti-friction coating, replace the second lubricant with a commercially available graphite dry film for hole extrusion with a graphite mass fraction of 13%, and form a anti-friction coating with a thickness of 50 μm after drying.

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Abstract

The invention provides a hole extrusion strengthening method for an aluminum alloy thick plate and a lubricant for the method. The hole extrusion strengthening method is characterized in that a connecting hole wall is coated with an anti-attrition coating with different lubricating properties, and the friction coefficient of the surface of the coating is larger than that of an inner layer, so that a more uniform friction coefficient and better lubricating performance can be provided when the coating is abraded, the probability that a hole wall is scratched or the hole wall-extrusion rod bonding probability is reduced, the hole extrusion strengthening effect is guaranteed, and the production efficiency is improved.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy processing, and in particular relates to a hole extrusion strengthening method of an aluminum alloy thick plate and a lubricant suitable for the method. Background technique [0002] Most components of an aircraft are assembled by installing fasteners in connection holes. The area around the hole is a high stress concentration area, which is prone to problems such as fatigue fracture failure. With the rapid development of the aerospace industry, the requirements for aircraft anti-fatigue manufacturing technology continue to increase. In the actual production process, the hole extrusion technology is often used to strengthen the hole. The hole extrusion strengthening technology continuously and uniformly extrudes the hole through a hard extrusion rod, so that a certain depth of elastic-plastic deformation layer and work hardening are formed around the hole. layer, thereby improving the fat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22F1/04C10M169/04C10M177/00C10N50/02C10N50/08C10N30/06C10N30/08C10N30/10C10N40/24
CPCC10M169/04C10M177/00C10M2201/041C10M2201/065C10M2209/103C10M2217/044C22F1/04
Inventor 黄粒陈军洲戴圣龙陈雪梅虞文军
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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