A kind of preparation method of high-strength aluminum alloy bolt

An aluminum alloy, high-strength technology, used in manufacturing tools, heat treatment equipment, furnaces, etc., can solve problems such as backwardness

Active Publication Date: 2020-06-02
NORTHEASTERN UNIV LIAONING
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the production technology of aluminum alloy bolts, especially high-strength aluminum alloy bolts, is still relatively backward in China. In the open literature, there is no preparation of high-strength aluminum alloy bolts with a tensile strength above 700MPa and a shear strength above 360MPa. technical related reports

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  • A kind of preparation method of high-strength aluminum alloy bolt

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preparation example Construction

[0020] see figure 1 , a method for preparing a high-strength aluminum alloy bolt provided in an embodiment of the present invention includes the following steps:

[0021] Alloy casting: cast the aluminum alloy melt into a cast rod with a diameter of 60-100mm and a length of 10-27 meters through a semi-continuous casting process, control the segregation layer on the surface of the cast rod to be less than 3mm, and then homogenize the cast rod, and finally Cast rod milling, the thickness of the milling surface is 1-3mm, and the composition of the aluminum alloy melt is: Zn: 8.0-9.5wt.%, Mg: 1.7-2.9wt.%, Cu: 2.0-2.7wt. %, Zr: 0.08~0.2wt.%, Ti: 0.01~0.03wt.%, Si: <0.1wt.%, Fe: <0.15wt.%. Other unavoidable impurity elements are each less than 0.05wt.%, and the total is less than 0.15wt.%, and the balance is Al;

[0022] Cast rod continuous rolling: the cast rod is rolled into an aluminum rod with a diameter of 10-40mm by a short stress line continuous rolling mill, the rolling te...

Embodiment 1

[0036] Raw material preparation: alloy composition is Zn: 8.8wt.%, Mg: 2.6wt.%, Cu: 2.5wt.%, Zr: 0.15wt.%, Ti: 0.02wt.%, Si: <0.1wt.%, Fe : <0.15wt.%, other unavoidable impurity elements each less than 0.05wt.%, and the total is less than 0.15wt.%, the balance is Al. Use pure metal aluminum, pure metal zinc, pure metal copper, pure metal magnesium, Al-Zr master alloy, and Al-Ti master alloy as raw materials for material preparation.

[0037] Melting and casting: smelting in a reflective aluminum melting furnace, adding pure metal aluminum, Al-Zr master alloy, and Al-Ti master alloy to the furnace for melting at the same time, adding pure metal copper after melting, raising the temperature to 740°C, and adding pure metal Zinc, pure metal magnesium, when adding metal magnesium, press the magnesium block completely below the liquid surface through the pressure cover; after these metals are melted and stirred evenly, the temperature is raised to 750°C, and the refining agent is us...

Embodiment 2

[0045] Raw material preparation: alloy composition is Zn: 8.0wt.%, Mg: 2.3wt.%, Cu: 2.0wt.%, Zr: 0.08wt.%, Ti: 0.01wt.%, Si: <0.1wt.%, Fe : <0.15wt.%, other unavoidable impurity elements each less than 0.05wt.%, and the total is less than 0.15wt.%, the balance is Al. Use pure metal aluminum, pure metal zinc, pure metal copper, pure metal magnesium, Al-Zr master alloy, and Al-Ti master alloy as raw materials for material preparation.

[0046] Melting and casting: smelting in a reflective aluminum melting furnace, adding pure metal aluminum, Al-Zr master alloy, and Al-Ti master alloy to the furnace for melting at the same time, adding pure metal copper after melting, raising the temperature to 740°C, and adding pure metal Zinc, pure metal magnesium, when adding metal magnesium, press the magnesium block completely below the liquid surface through the pressure cover; after these metals are melted and stirred evenly, the temperature is raised to 750°C, and the refining agent is us...

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Abstract

The invention provides a preparation method of high-strength aluminum alloy bolts. The preparation method comprises the steps of alloy casting, continuous rolling of cast bars, bolt formation, bolt thermal treatment, bolt surface treatment and the like. By means of the preparation method, the high-strength aluminum alloy bolts with the tensile strength reaching 700 MPa or above and the shearing strength reaching 360 MPa or above can be prepared and can completely meet the connection requirement of high-strength aluminum alloy materials.

Description

technical field [0001] The invention relates to the technical field of aluminum alloy device preparation, in particular to a method for preparing high-strength aluminum alloy bolts. Background technique [0002] With the development trend of lightweight, aluminum alloy, as a representative of light alloy structural materials, is more and more used in various fields of modern industry. A large number of applications of aluminum alloys will inevitably involve connection problems between materials. Due to the characteristics of aluminum alloys, aluminum alloys with a strength greater than 460MPa are usually not connected by welding. Bolting is a common connection method for high-strength aluminum alloys. For the principle of performance matching and corrosion prevention, bolting of high-strength aluminum alloys should use high-strength aluminum alloy bolts. At present, the production technology of aluminum alloy bolts, especially high-strength aluminum alloy bolts, is still re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/10C22F1/053C21D9/00B23P15/00
CPCB23P15/00C21D9/0093C22C21/10C22F1/002C22F1/053
Inventor 赵志浩秦高梧王高松朱庆丰朱成
Owner NORTHEASTERN UNIV LIAONING
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