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Aluminum case forging process description

aluminum cases published on 2010-04-26 21:41 | views: 1,832 views

  aluminum case forging process is the general process: milling, compaction, sintering (including hot isostatic pressing, cold isostatic pressing, etc.), forging, finishing. Rapid solidification, mechanical alloying, and other powder metallurgy (P / M) technology has been used to develop homogeneous high-strength, high temperature and corrosion resistance of new aluminum alloy, which is the standard alloy ingot (I / M) process did reach.
Chongqing aluminum case powder preform forging method for producing structural parts used. Forged aluminum preform, may hot forging or cold forging, aluminum briefcase,Sintered painted in graphite lubricant to make it generate the appropriate time in forging metal flow. Require strict mode for full-bore parts, recommended 300 ~ 400 ℃ under the hot forging. Forging pressure is usually not higher than 345MPa. Closed die forging is usually carried out, therefore, do not flash, and, forging only been created when compacting and lateral mobility. Common forging nearly 50% of chip loss, while less than 10% powder forging. Forged aluminum case parts of Chongqing, the density higher than 99.5% theoretical density, intensity ratio of non-forged powder metallurgy parts is 40% ~ 60%, fatigue endurance limit increased by 1 times. Other areas, similar to ordinary forgings. aluminum briefcase,
1. High-strength aluminum alloy pre-alloyed powder metallurgy
Study found that pre-alloyed powders of high strength aluminum alloy 7090,7091, X7064, CW67 and IN9021, are used all the existing forging forging technology, and can be processed into various types of open-die forging and closed die forging. These alloys the flow stress and deformation behavior of alloy 7075 is similar to the recommended forging temperature and the same 7010,7049,7050 or 7075 alloy, while the mold preheating temperature the same as in Table 10.
Or alloy powders rapidly solidified by a number of consolidation techniques such as vacuum hot pressing or hot isostatic pressing, made of various sized ingot, about its quality from 45kg to 1360kg. In this ingot form, pre-alloyed powder metallurgy of high strength alloys are usually made of forging direct or apply other processing techniques, such as rolling or extrusion, processed into the bar for forging or plate. Application of pre-alloyed powder metallurgy technology made aluminum – lithium alloy ingots for industrial use than the 7 × Metallurgy Alloys much more expensive, it is the most cost-effective precision forging forging method.
Pre-alloyed powder metallurgy of high strength aluminum alloy, heat treatment into the general state of T7 × (solution treatment and stabilization treatment status), to obtain strength and fracture toughness, and resistance to stress corrosion cracking and peeling the best combination. Pre-alloyed powder metallurgy of high strength aluminum alloy in the corrosion resistance level is better than ingot metallurgy. The high strength IN9021 alloy, usually dealing with its forging into T4 condition (solution treatment and natural aging state). Some of the above alloys, in view of their excellent overall performance, its respect in aerospace forgings has been part of the industrial applications.
2. Anti-corrosion pre-alloyed powder metallurgy aluminum alloy forgings
IN9052 alloy is a medium-strength aluminum alloy pre-alloying, the mechanical properties of ingot metallurgy method (I / M) 5083 alloy is similar, but with excellent corrosion resistance. This alloy at low temperature (less than 370 ℃) under the forging, the flow stress and deformation characteristics of 5083 alloy is similar. The same as high-strength powder metallurgy aluminum alloy, IN9052 also solid alloy ingot form, through the extrusion and forging. Because the reasons for the price of materials, still apply to use precision forging method.
3. High temperature pre-alloyed powder metallurgy aluminum alloy forgings
Several rapid solidification technology, including atomization, aluminum portfolio case ,centrifugal casting and the plane has been used to develop a series of pre-casting of aluminum alloy, this alloy has much improved high temperature performance over the existing ingot metallurgy wrought aluminum, For example, alloys 2219 and 2618, and the A201 aluminum alloy. Development of these alloys to the 205 ~ 345 ℃ temperature range of forgings with enhanced performance, which is the current aluminum unattainable.
Temperature characteristics of these alloys, which find it difficult to process them into forging, its flow stress at twice the 7075 alloy. Forged aluminum alloy tank temperature has not yet been fully established, but usually less than 370 ℃ in the forging temperature in order to maintain the characteristics of the alloy microstructure. All of these high-temperature alloy is a non-heat type, by dispersion strengthening, work hardening intermediate compounds and to improve its mechanical properties, aluminum portfolio case,.
Processing history of these alloys also show the further processing of the key role. For example, some alloy ingot in the case of consolidation can not be forged, but must go through extrusion or other techniques of primary processing. Today, however, the forging process of the research show that these alloys can be successfully closed by the fine-mode processing, and can be processed into ring forgings, including high accuracy, precision forgings.

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