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

An aluminum alloy and lubricant technology, which is used in the field of hole extrusion strengthening of aluminum alloy thick plates and lubricants, can solve the problems of reduced extrusion strengthening effect, scratched hole walls, large extrusion force, etc., and achieves excellent reduction. Anti-wear performance, guaranteed effect, effect of uniform friction coefficient

Active Publication Date: 2021-10-12
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 of aluminum alloy thick plate and lubricant for said method
  • Hole extrusion strengthening method of aluminum alloy thick plate and lubricant for said method
  • Hole extrusion strengthening method of aluminum alloy thick plate and lubricant for said 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 cured 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, so ...

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 of an aluminum alloy thick plate and a lubricant for the method. The invention forms a friction-reducing coating with differential lubricating properties by coating the connection hole wall, and the surface of the coating is The friction coefficient is larger than that of the inner layer, which can provide a more uniform friction coefficient and better lubricating performance when the coating is worn, reduce the hole wall scratch or the hole wall-extrusion rod bonding probability, and ensure the hole extrusion Pressure strengthening effect, improve production efficiency.

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 Patents(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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