1. Technical Field
The present disclosure relates to methods of forging aluminum/aluminum alloys, especially to a method of forging aluminum/aluminum alloys to form aluminum/aluminum alloy forged pieces having precise sizes.
2. Description of Related Art
Forging is the process by which metal is heated and is shaped by plastic deformation by suitably applying compressive force. Usually, the compressive force is in the form of a power hammer or a press. Isothermal forging is a precise forging process during which the forging temperature is not changed. With regard to dimensional accuracy and a minimal reworking, those products of isothermal forging conform to the high quality standards.
For aluminum/aluminum alloy forged pieces such as mobile phone assembly having protrusions with small sizes and thin sidewalls, the aluminum/aluminum alloy forged pieces should be urged out by urging the thin sidewall of the protrusion using a carrier rod after being isothermally forged. However, the aluminum/aluminum alloy forged pieces are usually at a high temperature and have weak strength once be forged, the thin sidewall of the protrusion being urged is prone to deformation.
Therefore, there is room for improvement within the art.
Many aspects of the disclosure can be better understood with reference to the following figures. The components in the figures are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the disclosure. Moreover, in the drawings like reference numerals designate corresponding parts throughout the several views.
The method of forging aluminum/aluminum alloy may include the following steps:
Referring to
The upper die 10 is heated by the first heating element 11. Simultaneously, the lower die 20 is heated by the second heating element 21. If forged piece is in the upper die 10 when unloading after forging process, the temperature of the upper die 10 may be lower than the lower die 20 by about 100° C.-350° C., and the lower die 20 is heated to about 300° C.-420° C. After the forging process, if the forged piece is in the lower die 20 when unloading, the temperature of the lower die 20 may be about 100° C.-350° C. lower than the upper die 10, and the upper die 10 is heated to about 300° C.-420° C.
The aluminum/aluminum alloy billet 300 is located in the lower die 20. The aluminum/aluminum alloy billet 300 may be pre-heated before being located in the lower die 20, or directly heated in the lower die 20.
The upper die 10 and the lower die 20 are assembled, and an oil press machine (not shown) or a forging press machine (not shown) is used to attack the forging die 100 to forge the aluminum/aluminum alloy billet 300 to get an aluminum/aluminum alloy forged piece 200 (referring to
The upper die 10 and the lower die 20 are opened, then the carrier rods 25 start to urge and remove the aluminum/aluminum alloy forged piece 200.
The method of forging aluminum/aluminum alloys is also fit to forging magnesium/magnesium alloys.
The aluminum/aluminum alloy billet 300 is a 5052 aluminum alloy. The aluminum/aluminum alloy billet 300 has a size of 50 mm×43 mm×5 mm.
The upper die 10 is heated to about 360° C.-380° C., the lower die 20 is heated to about 160° C.-180° C., the temperature difference between the upper die 10 and the lower die 20 is about 100° C.-200° C. An oil press machine is used to attack the forging die 100 for about 1 min-2 min to form the aluminum/aluminum forged piece 200.
Referring to
The cylindrical protrusions 210 and the square protrusions 220 are not deformed when the aluminum/aluminum alloy forged piece 200 is urged out, so the cylindrical protrusions 210 and the square protrusions 220 have precise sizes. This is because that there is temperature difference between the upper die 10 and the lower die 20 during the whole forging process, and the aluminum/aluminum alloy forged piece 200 is located in the lower temperature die (upper die 10 or lower die 20), which gives the aluminum/aluminum alloy forged piece 200 a greater strength comparing to a normal isothermal forging process.
The rigidity of the aluminum/aluminum alloy forged piece 200 has been tested. The test indicated that the rigidity of the aluminum/aluminum alloy forged piece 200 is no less than the aluminum/aluminum alloy billet 300.
It is believed that the exemplary embodiment and its advantages will be understood from the foregoing description, and it will be apparent that various changes may be made thereto without departing from the spirit and scope of the disclosure or sacrificing all of its advantages, the examples hereinbefore described merely being preferred or exemplary embodiment of the disclosure.
Number | Date | Country | Kind |
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201110172988.6 | Jun 2011 | CN | national |