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Free-cutting aluminum alloy extrudate with excellent brittle resistance at high temperature

A free-cutting, high-temperature-resistant technology, applied in the field of lead-free free-cutting aluminum alloys, which can solve problems such as fracture, brittle failure, and decreased productivity.

Active Publication Date: 2008-10-01
FURUKAWA SKY ALUMINUM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is a concern that brittle fractures may occur when products formed by machining are used at high temperatures
[0005] Moreover, the free-cutting aluminum alloy containing Sn-Bi not only breaks during cutting, but also breaks during the alloy preparation process before drawing (口交け) or during drawing, resulting in a decrease in yield.

Method used

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  • Free-cutting aluminum alloy extrudate with excellent brittle resistance at high temperature
  • Free-cutting aluminum alloy extrudate with excellent brittle resistance at high temperature
  • Free-cutting aluminum alloy extrudate with excellent brittle resistance at high temperature

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preparation example Construction

[0030] As for the preparation conditions and heat treatment of the alloy of the present invention, under conventional preparation conditions, the heat treatment can be selected according to the application. For example, you can choose T1 for hot working, T6 for solutionization and artificial aging, or T8 and T9 for solutionization, cold working and artificial aging. High-strength alloys have excellent chip cutting properties, so heat treatment such as T3, T8, and T9, which are cold-worked and artificially aged after solid solution, are particularly preferred.

[0031] The machinability of the free-cutting aluminum alloy extruded material of the present invention, the Al-Cu lead-free alloy is equivalent to that of traditional free-cutting alloys such as JIS2011 alloy, and has excellent high-temperature resistance to brittleness and corrosion resistance.

Embodiment

[0033] Next, the present invention will be described in detail based on examples.

[0034] An alloy having a composition shown in Table 1 was melted to obtain an ingot having a diameter of 220 mm. The ingot was homogenized at 480° C. for 6 hours. The ingot was then formed into extruded rods with a diameter of 35 mm by extrusion at 400°C. The rods were quenched with water immediately after solutionization at 500° C. for 2 hours. Further, it was drawn into a 30 mm bar, and then subjected to a prescribed aging treatment to produce a heat-treated material as shown in Table 1. The aging condition of T8 treatment is 160°C, 14 hours.

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Abstract

A free-cutting aluminum alloy extrudate having excellent brittle resistance at high temperatures which contains 3-6 mass% Cu and 0.9-3 mass% Bi, with the remainder being Al and unavoidable impurities. When the extrudate is examined in a Charpy impact test, the temperature at which the Charpy impact value is one-half the value at room temperature is 180 DEG C or higher.

Description

technical field [0001] The invention relates to a free-cutting aluminum alloy extruded material, which is a lead-free free-cutting aluminum alloy and has excellent machinability. Background technique [0002] Aluminum alloys are often used in bearings, optical parts, automotive parts, etc. due to their characteristics of being easy to cut. When cutting aluminum alloys, people pay more attention to the handling of chips, and hope that the chips are discontinuous and cut very finely. Especially in recent years, in the process of cutting with an infeed tool, it has begun to set a rake angle at the cutting tool to reduce the surface roughness of the product, so the conflict between the chip and the cutting tool becomes smaller, and the cutting of the chip becomes difficulty. [0003] Extrusion materials such as JIS 2011 alloy in which Pb and Bi are added to Al-Cu alloy and JIS 6262 alloy in which Pb and Bi are added to Al-Mg-Si alloy are currently used as aluminum alloys with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/12
CPCC22C21/12
Inventor 森谦介田口和夫
Owner FURUKAWA SKY ALUMINUM CORP
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