Free-machining aluminum alloy
a technology of aluminum alloy and free machining, which is applied in the field of free machining aluminum alloy composition, can solve the problems of difficult to increase the machinability of aluminum alloys, increase the level of environmentally unfriendly heavy metals, and often elusive ways of improving one property without degrading another property, etc., to achieve the effect of improving the free machining properties of aluminum alloys, and enhancing the dispersion of graphitic particles
Inactive Publication Date: 2012-04-19
ARCONIC INC
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Benefits of technology
"The patent text describes various methods and compositions for improving the free machining properties of aluminum alloy compositions. The methods involve adding boron nitride or graphitic materials to the alloy composition, which can reduce friction during machining and promote the formation of small chip-like debris. The resulting alloy compositions have improved machinability and can be used for various applications such as manufacturing of machined articles. The patent text also describes the use of ultrasonic oscillation and gas injection to enhance the dispersion of graphitic particles in the alloy composition. Overall, the patent text provides technical means for enhancing the performance of aluminum alloy compositions during machining operations."
Problems solved by technology
However, improving one property of an aluminum alloy without degrading another property often proves elusive.
For example, it is difficult to increase the machinability of an alloy without also increasing the level of environmentally unfriendly heavy metals in the alloy.
Method used
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[0026]Fabrication: A suspension of aluminum of the AA6061 composition was melted and blended with 1.0 wt %-325 mesh sized boron nitride powder (D10=4.8 microns; D50=9.6 microns; D90=17.6 microns). The molten suspension was subjected to ultrasonic oscillation at 1.5 to 2.5 kW power for 3 minutes to disperse and wet the boron nitride powder and subsequently cast. Extrusion billets of 30 mm diameter were machined from the cast product and homogenized at 570° C. for 3 hours and allowed to air cool. Billet specimens were heated to 476° C. and extruded to a rod diameter of 14 mm. Following solutionizing at 538° C. for 5 minutes, rod specimens were direct quenched into ambient temperature water. Lastly, the solutionized specimens were subjected to the standard 6061 aging practice of 170° C. for 8 hours to bring the specimens to a T6 temper.
[0027]Machining Trials: Standard machinability tests were conducted on baseline specimens of AA6061-T6 and on the AA6061-T6 specimens produced using the...
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Abstract
Various illustrative embodiments of a free-machining aluminum alloy composition and related methods are provided. The aluminum alloy composition can include an aluminum alloy and an effective amount of a graphitic material as a free-machining constituent. Free-machining means the graphitic material is capable of modifying the machining character of the aluminum alloy by affecting the generation of chip-shaped machining debris and / or the friction between the machining tool and the workpiece.
Description
RELATED APPLICATIONS[0001]This application claims the benefit, and priority benefit, of U.S. Provisional Patent Application Ser. No. 61 / 394,110, filed Oct. 18, 2010, titled “Free Machining Aluminum Alloy,” the disclosure of which is incorporated herein in its entirety.BACKGROUND[0002]1. Field of Invention[0003]This invention relates generally to a free-machining aluminum alloy composition and related methods.[0004]2. Description of the Related Art[0005]Aluminum alloys are useful in a variety of applications. However, improving one property of an aluminum alloy without degrading another property often proves elusive. For example, it is difficult to increase the machinability of an alloy without also increasing the level of environmentally unfriendly heavy metals in the alloy. Other properties of interest for aluminum alloys include, for example, recyclability and chip formation during machining.SUMMARY[0006]Various illustrative embodiments of a free-machining aluminum alloy compositi...
Claims
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IPC IPC(8): C22C21/00C22C1/03C22C21/16C22C1/02C22C21/08C22C21/14
CPCC22C32/0047C22F1/05C22C21/08C22C21/02
Inventor BRYANT, J. DANIEL
Owner ARCONIC INC