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Stirring-friction-based crack repair method

A friction stir and repair method technology, applied in the field of defect repair, can solve the problems of repeated cracks, high labor intensity and high repair cost, and achieve the effects of low repair cost, economical and environmental protection, and simple repair process.

Inactive Publication Date: 2013-07-24
SHENYANG AEROSPACE UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In view of the above problems, the present invention proposes a crack repair method based on friction stir, which mainly solves the shortcomings of the prior art such as high labor intensity, high repair cost, poor repair quality and easy repeated cracks.

Method used

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  • Stirring-friction-based crack repair method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The repair of long straight cracks on the surface of 6 mm thick 6063-T6 aluminum alloy plate, the crack depth is 1 mm, and the length is 150 mm. The specific steps are as follows:

[0029] 1. Select ordinary tool steel as the tool material for friction stir repair without stirring needles, such as image 3 , The shaft shoulder diameter is designed to be 5mm, and quenched and tempered after processing.

[0030] 2. Use sandpaper to polish the surface around the crack to remove scale and surface dirt.

[0031] 3. Rigidly fix the parts to be repaired on the workbench of the friction stir welding machine in the Key Discipline Laboratory of National Defense Digital Manufacturing of Shenyang Aerospace University.

[0032] 4. Select the rotation speed of the repair tool to be 1000 rpm, the travel speed to be 100 mm / min, the pressing amount of the shaft shoulder to be 0.2 mm, and the inclination angle of the main shaft to be 3 degrees, so that the repair tool runs from the begi...

Embodiment 2

[0036] 4 mm thick 2A12-T4 aluminum alloy plate through crack repair, crack depth 3 mm, length 100 mm, the specific steps are as follows:

[0037] 1. Select ordinary tool steel as the friction stir repair tool material, and use a tapered and threaded stirring needle, such as Figure 4 , length 3.5mm, average diameter 3mm, surface turning shallow thread, shaft shoulder diameter design 10mm, quenching and tempering treatment after processing.

[0038] 2. Use sandpaper to polish the surface around the crack to remove scale and surface dirt.

[0039] 3. Rigidly fix the parts to be repaired on the workbench of the friction stir welding machine in the Key Discipline Laboratory of National Defense Digital Manufacturing of Shenyang Aerospace University.

[0040] 4. Select the rotation speed of the repair tool to be 1200 rpm, the travel speed to be 80 mm / min, the pressing amount of the shoulder shoulder to be 0.5 mm, and the inclination angle of the main shaft to be 3 degrees, so that ...

Embodiment 3

[0044] The difference from Example 1 is:

[0045] 15mm thick 6063-T6 aluminum alloy thick plate 5mm through crack repair, the repair tool form is a tapered thread with a stirring pin, the average diameter of the stirring pin is 5mm, the length is 6mm, and the shaft shoulder diameter is 20mm. Before repairing, add 6063 aluminum wire with a diameter of 1.5mm along the crack, and then repair the crack. The process parameters are as follows: the rotation speed is 1500 rpm, the travel speed is 60 mm / min, and the pressing amount of the shoulder is 1mm. After the repair is completed, carry out Deburring and flashing treatment, and T6 heat treatment for repaired parts.

[0046] The 6063-T6 aluminum alloy plate repaired by this process method has no cracks and other defects through X-ray and fluorescence inspection.

[0047] For alloys such as aluminum and magnesium, ordinary tool steel should be used as the repair tool material; for steel and titanium alloy high melting point materials...

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Abstract

The invention relates to a stirring-friction-based crack repair method which mainly is used for solving the problems in the prior art that the repair cost is high, the repair quality is poor and cracks appear repeatedly. The method is applied to the repair of surface cracks and through cracks of plate-shell metal structures, so as to enable cracked workpieces to meet reuse requirements. The method comprises the following specific steps of designing and manufacturing a friction repair tool according to the position and size of a crack, a material to be repaired, structural characteristics and the like; and realizing the friction between a shaft shoulder and the surface of the material to be repaired through the rotation of the repair tool so as to enable metal of a repair area to reach a thermoplastic state under the action of frictional heat, and realizing the flowing transfer and dynamic recrystallization of thermoplastic metal around the crack by using the rotating and upsetting action of the shaft shoulder of the repair tool, thereby realizing the filling repair of the crack. The method has the advantages that the method is simple, the damage to base metal is little, the quick, equal-strength and in-situ repair of engineering cracks can be realized, and the repair process is economical and environment-friendly. The method can be applied to the crack repair in fields, such as aeronautics and astronautics, shipbuilding, automobiles and rail transportation and has broad application prospects.

Description

technical field [0001] The invention relates to a crack repair method based on friction stirring, which is suitable for repairing surface and through cracks of various metal materials and structures, and belongs to the technical field of defect repair. Background technique [0002] During the service process, due to the impact of external forces, environmental corrosion and other factors, engineering structures will produce a large number of defects on the surface; engineering materials will also produce defects such as holes and microcracks in the interior due to processing (such as welding, heat treatment, casting, etc.). The above-mentioned defects will eventually lead to shallow surface cracks or deep cracks penetrating the surface of the engineering structure. The most harmful defect in materials or structures is cracks. Cracks are often multiple, sudden and repetitive, and can gradually expand under load to cause structural fractures. Mechanical parts and metal structu...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 王磊回丽许良马少华周松李平赟张宁
Owner SHENYANG AEROSPACE UNIVERSITY
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