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Large-diameter low-deformation-resistance free cutting aluminum alloy ingot and preparation process thereof

An aluminum alloy ingot, preparation process technology, applied in the field of aluminum alloy preparation, can solve the problems of large radial chemical composition difference, high casting stress, central cold crack or surface crack, etc., achieve small radial distribution difference, eliminate casting Stress, long life effect

Active Publication Date: 2019-04-23
广东精美特种型材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] For high-strength free-cutting alloys, the degree of alloying is high. At the same time, in order to improve its cutting performance, a certain amount of low melting point components such as Bi and Sn are added, resulting in a wide range of crystallization temperature of the alloy, high casting stress and high deformation resistance.
Especially when preparing large-diameter ingots, it often results in large differences in radial chemical composition, prone to central cold cracks or surface cracks, and high deformation resistance during subsequent extrusion processing, large damage to tools and molds, and low production efficiency
In addition, the large-diameter free-cutting alloy ingot produced by traditional technology has a segregation layer defect of 10-20mm at the edge. During the deformation process, the segregation layer flows into the product, resulting in tissue waste.

Method used

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  • Large-diameter low-deformation-resistance free cutting aluminum alloy ingot and preparation process thereof
  • Large-diameter low-deformation-resistance free cutting aluminum alloy ingot and preparation process thereof
  • Large-diameter low-deformation-resistance free cutting aluminum alloy ingot and preparation process thereof

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Embodiment 4

[0036] The difference between the present embodiment 4 and embodiment 2 is the casting step, specifically:

[0037] The casting process adopts oil-air lubricating tooling and pulse oil injection. The oil injection time in one cycle is 12s, and the oil injection time is 18s. The aluminum melt enters the vacuum online degassing box through the launder, and the air in the degassing box is extracted to form a negative pressure. The liquid level in the degassing box rises, and the bottom-mounted rotor rotates at a high speed and feeds argon with a purity of 99.999%. The gas is cut into countless fine bubbles, and the gas and impurities in the aluminum melt are adsorbed on the surface of the bubbles, and then float on the surface of the melt to achieve the purpose of degassing and impurity removal. The rotor speed is 450rpm. The melt flows to the crystallizer platform, and when the liquid level rises to 1 / 4 of the height of the insulation cap, the casting is started and the holding ...

Embodiment 5

[0039] The difference between this embodiment 5 and embodiment 2 is the casting step, specifically:

[0040] The casting process adopts oil-air lubricating tooling and pulse oil injection. The oil injection time in one cycle is 12s, and the oil injection time is 18s. The aluminum melt enters the vacuum online degassing box through the launder, and the air in the degassing box is extracted to form a negative pressure. The liquid level in the degassing box rises, and the bottom-mounted rotor rotates at a high speed and feeds argon with a purity of 99.999%. The gas is cut into countless tiny bubbles, and the gas and impurities in the aluminum melt are adsorbed on the surface of the bubbles, and then float on the surface of the melt to achieve the purpose of degassing and impurity removal, and the rotor speed is 500pm. The melt flows to the crystallizer platform, and when the liquid level rises to 1 / 4 of the height of the insulation cap, the casting is started and the holding time...

Embodiment 6

[0042] The difference between this embodiment 6 and embodiment 2 lies in the high temperature diffusion treatment step, specifically:

[0043] The heating process of high-temperature diffusion treatment is three-stage, the first stage is 50-60°C / h, from room temperature to 250°C; the second stage is 65-75°C / h, from 250°C to 400°C; the third stage is 50°C ~60°C / h, rising from 400°C to 500°C. The holding temperature is 500°C, and the holding time is 20h. The cooling process of high-temperature diffusion treatment is three-stage, including one stage cooling to 420°C at 15-20°C / h in the heat treatment furnace, the second stage cooling to 250°C at 20-30°C / h in the holding furnace, and the third stage Transfer out of the holding furnace to air cool. Among them, the holding furnace is a closed furnace body, and the furnace gas can realize internal circulation.

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Abstract

The invention discloses a large-diameter low-deformation-resistance free cutting aluminum alloy ingot and a preparation process thereof. The aluminum alloy ingot comprises the following chemical components in percentage by mass: 0.30-0.80% of Si, 0.10-0.60% of Fe, 3.4-4.4% of Cu, 0.50-0.90% of Mn, 0.50-1.3% of Mg, 0.01-0.08% of Cr, 0.05-0.40% of Zn, 0.40-1.0% of Bi, 0.03-0.10% of Ti, Sn not more than 0.02%, and the balance of Al and inevitable other impurities; the single content of the inevitable other impurities is not more than 0.05%; and the total amount is not more than 0.15%. The invention aims to provide the preparation process of the large-diameter aluminum alloy ingot; the problems of thick segregation layers, easy generation of cracks and weak component uniformity in production of hard alloy ingots with diameters of more than 400 mm by a traditional process are overcome; and the high-temperature dispersion is performed before deformation machining to obtain high-quality ingots with uniform component distribution, compact structure dispersion and easy deformation machining.

Description

technical field [0001] The invention belongs to the technical field of aluminum alloy preparation, and relates to an aluminum alloy ingot with a large diameter, low deformation resistance and easy cutting and a preparation process thereof. Background technique [0002] Free-cutting aluminum alloy is widely used in automobiles, electronic products, hydraulic equipment and other fields at home and abroad because of its excellent cutting performance, high processing efficiency and products with high surface finish after processing. Master cylinder brake pistons, charging valve bodies, various connectors, pressure gauges and other components that require high precision and component strength. [0003] For high-strength free-cutting alloys, the degree of alloying is high. At the same time, in order to improve its cutting performance, a certain amount of low melting point components such as Bi and Sn are added, resulting in a wide crystallization temperature range of the alloy, hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/18C22C1/02C22C1/06B22D11/114C22F1/057
CPCB22D11/114C22C1/026C22C1/06C22C21/18C22F1/057
Inventor 刘欢罗涛涛周江平余琳玲
Owner 广东精美特种型材有限公司
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