High-strength cast aluminium alloy material and preparing method thereof

A technology for casting aluminum alloys and aluminum alloy materials, which is applied in the field of aluminum alloy materials, can solve the problems of low performance, low strength, and weight reduction of die-casting parts, and achieve low slag content and gas content, good lightweight effect, Ease of Die Casting Production

Inactive Publication Date: 2019-01-29
南通众福新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since die castings cannot be strengthened by heat treatment, and there are problems of shrinkage porosity and shrinkage cavities, the performance of die castings is generally not high, and cannot meet the requirements of further weight reduction through structural optimization design
At present, the self-strengthening cast aluminum alloy series is only Al-Zn series. This series of alloys has the characteristics of quenching structure in the casting state, and high strength can be obtained without heat treatment. At present, the existing aluminum alloy grades have good casting properties. performance, cutting performance, welding performance and dimensional stability, which can avoid the deformation and dimensional changes caused by the quenching process, but hot cracking occurs, and the strength is not high, which hinders the application of the alloy

Method used

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Examples

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preparation example Construction

[0019] A method for preparing a high-strength cast aluminum alloy material, comprising the following steps:

[0020] Melting: Add 1500-2000Kg of raw aluminum slices to the melting furnace. The raw aluminum slices are scrap aluminum scraps such as automobile engines, gearbox shells and other cast aluminum alloys that have been crushed and sorted; heated to 560°C to start raw aluminum slices Melt, and then continue to heat up to 680°C. After it is completely melted, remove the dross on the surface of the obtained molten aluminum; the steps to remove the dross are: raw aluminum slices contain some inclusions, which will float after smelting. Rake out the dross on the surface of the molten aluminum; take samples, and use a direct-reading spectrometer to measure the chemical composition of the molten aluminum in the furnace. The chemical composition at this time is only used as the basis for the next stage of feeding; all elements are measured, only Zn element It is the benchmark, ...

Embodiment 1

[0030] A method for preparing a high-strength cast aluminum alloy material, comprising the following steps:

[0031] I. Melting: Add 2000Kg of raw aluminum slices to the melting furnace, heat to 560°C and start to melt the raw aluminum slices, then continue to heat up to 680°C, after all of them are melted, remove the scum on the surface of the obtained molten aluminum; Sampling, using a direct-reading spectrometer to measure the chemical composition of the molten aluminum in the furnace, and adjusting the chemical composition of the molten aluminum by adding raw aluminum slices and cooked aluminum slices to the molten aluminum until the content of Zn in the molten aluminum is controlled at 1.05 parts;

[0032]II. Scraping iron: After adding 9500Kg of raw aluminum slices and cooked aluminum slices and melting them all, remove the scum on the surface, control the temperature at 630°C, and rake out the free iron pieces that have sunk into the bottom of the furnace, and fully remo...

Embodiment 2

[0041] A method for preparing a high-strength cast aluminum alloy material, comprising the following steps:

[0042] I. Melting: Add 1850Kg raw aluminum slices to the smelting furnace, heat to 560°C and start to melt the raw aluminum slices, then continue to heat up to 680°C, after all of them are melted, remove the scum on the surface of the obtained molten aluminum; Sampling, using a direct-reading spectrometer to measure the chemical composition of the molten aluminum in the furnace, and adjusting the chemical composition of the molten aluminum by adding raw aluminum slices and cooked aluminum slices to the molten aluminum until the content of Zn in the molten aluminum is controlled at 1.1 parts;

[0043] II. Scraping iron: After adding 9100Kg of raw aluminum slices and cooked aluminum slices and melting them all, remove the surface scum, control the temperature at 645°C, rake out the free iron pieces that have sunk into the bottom of the furnace, and fully remove the free i...

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Abstract

The invention discloses a high-strength cast aluminium alloy material and a preparing method thereof. The preparing method of the high-strength cast aluminium alloy material comprises following stepsof I, smelting, II, iron scraping, III, adding of lacking metal, IV, component adjusting, V, refining degassing, VI, skin scraping testing, and VII, casting to form an ingot. The high-strength cast aluminium alloy material comprises chemical components including, by mass part, 10 to 10.8 parts of Si, 0.6 to 0.8 part of Fe, 2.0 to 3.5 parts of Cu, 0.15 to 0.35 part of Mn, 0.1 to 0.3 part of Mg, 0.10 to 0.95 part of Zn, and 83.45 to 85.95 parts of Al. The material has the good appearance, and good lightweight effect, and cannot generate heat cracking, performance needs of a car part particularlya structural part can be met, and the wide adaptation is achieved.

Description

technical field [0001] The invention relates to a preparation method, in particular to a high-strength cast aluminum alloy material and a preparation method thereof, belonging to the technical field of aluminum alloy materials. Background technique [0002] With the continuous advancement of automobile lightweight, cast aluminum alloys are widely used in various parts of automobiles. The market demand for cast aluminum alloys, especially die-cast aluminum alloys, is increasing year by year because of its good casting performance and mechanical properties, excellent Air tightness, fluidity, and thermal crack resistance have been widely used in various parts. According to statistics, aluminum alloy castings account for about 77% of the aluminum used in automobiles, and die castings account for 50% of the aluminum used in automobiles. %, including automobile engine block, cylinder head, gearbox, steering gear and motor housing, etc. Because die castings cannot be strengthened ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C1/02C22C21/02
CPCC22C1/026C22C21/02
Inventor 张明亮梁志敏张军国杨吟秋徐允涛
Owner 南通众福新材料科技有限公司
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