Stir head for friction stir machining and fabrication of metal matrix composite

A composite material and friction stir technology, applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of uneven distribution of reinforcement, large flash and extrusion of reinforcement, and reduce the amount of flash, distribution The effect of homogenizing and increasing the fluidity of plastic metals

Inactive Publication Date: 2013-09-11
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problem of uneven distribution of reinforcements and easy generation of large flashes and extrusion of reinforcements when preparing metal matrix composites with ordinary friction stir welding stirring heads, and to provide a method for preparing metal matrix composites by friction stir welding mixing head

Method used

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  • Stir head for friction stir machining and fabrication of metal matrix composite
  • Stir head for friction stir machining and fabrication of metal matrix composite
  • Stir head for friction stir machining and fabrication of metal matrix composite

Examples

Experimental program
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Effect test

Embodiment 1

[0024] A stirring head for preparing metal matrix composite materials by friction stir processing, the structure is as above, and the specific dimensions are:

[0025] The width and depth of the cooling groove 5 are 3mm. The shoulder 2 adopts a boss structure, the diameter of the shoulder is 15 mm, the diameter of the boss is 13 mm, the height of the boss is 0.2 mm, the bottom surface of the shoulder is concave, and the boss has three spiral grooves 7 .

[0026] The stirring needle is a cone with a root diameter of 6 mm, an end diameter of 3 mm, and a length of 5.5 mm. The stirring needle is threaded with a pitch of 1 mm. There are three side planes 8 parallel to the bus bar on the stirring needle.

[0027] When preparing metal matrix composites by friction stir processing, the substrate used is a 10mm thick 6061 aluminum alloy plate, and the reinforcement is Al with an average particle size of 50nm. 2 o 3 For particles, the processing parameters are as follows: rotation spe...

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Abstract

The invention relates to a stir head for friction stir machining and fabrication of metal matrix composite. The stir head for friction stir machining and fabrication of the metal matrix composite is of an integrated structure which is composed of a stir pin, a shaft shoulder and a clamping body. One end of the shaft shoulder is connected with the clamping body, the center of the other end of the shaft shoulder is connected with the stir pin, the end face of the end, at which the stir pin is fixedly arranged, of the shaft shoulder is of a concave shape, a lug boss is arranged on the end face, and a spiral or circular arc groove is formed in the periphery of the stir pin on the lug boss. The shaft shoulder is provided with a lug boss structure, the quantity of fins is reduced and the quantity of extrusion outputs is increased notably by means of the outer shaft shoulder and the concave bottom surface, the mobility of plastic metal can be improved by means of a groove of an inner shaft shoulder bottom surface and the side plane of the stir pin, and thus particles are distributed in a matrix evenly.

Description

technical field [0001] The invention relates to a stirring head, in particular to a stirring head suitable for preparing metal matrix composite materials through friction stir processing, and belongs to the technical field of metal matrix composite material preparation. Background technique [0002] Friction stir welding technology is a solid phase welding process invented by the British Welding Institute in 1991 (Patent No. US5460317, 1991.12). Friction stir processing technology is a new type of solid phase processing technology developed based on friction stir welding technology. The principle of preparing metal matrix composite materials by this technology is: use a high-speed rotating stirring head to press into the metal plate, and move along the processing direction at a certain speed. The stirring head stirs the metal matrix to generate friction heat, plastic deformation heat and severe plastic deformation, resulting in metal plasticity. Flow, the reinforcing body p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12
Inventor 杨敏宋超群
Owner SHANDONG UNIV
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