According to the master of transit aluminum xiaobian, forged aluminum-aluminum alloy belongs to a class of deformed aluminum alloy profiles, numbered LD. Including Al-Mg-Si-Cu series deformed aluminum alloy profiles and Al-Mg-Si series deformed aluminum alloy profiles, the key is to be used as steel castings with complicated shapes.

How long does it take to quench forged aluminum alloy?

Magnesium and silicon can produce strengthening phase Mg2Si；; Copper can improve the heat treatment characteristics and produce strengthening phase Cu4Mg5Si4Al；; Manganese can avoid overheating when heating. Forged aluminum alloys are mostly used in heat treatment and artificial aging. Artificial aging should be carried out immediately after heat treatment, otherwise the actual effect will be reduced. The key models are LD2, etc. Forged aluminum-aluminum alloy has low high-temperature compressive strength and good thermosetting property, and can be forged into steel castings and die forgings with complicated shapes, or cold-rolled into plates or other aluminum profiles. The key is used in aircraft parts.

Original production process and existing problems of forged aluminum alloy

1. Materials and technical standards

After heat treatment, tempering+quenching and tempering, the steel castings of guide impeller and centrifugal impeller of compressor are tested for physical properties.

2. The original production process

Application machinery and equipment: RJJ-75-6. Charging capacity: 24 guide vanes per furnace and 12 centrifugal impellers of compressor per furnace. The transfer time of soaking fire is less than 30s, and artificial aging is carried out immediately after heat treatment.

3. Existing problems

The heat treatment process is easy to be insulated for a long time, and each furnace must have three trains. In case of anxiety of the power supply system, the product quality problems will continue to be caused by power failure halfway. And the power consumption is high. According to the required parts of each diesel engine, the power consumption of heat treatment process of these two commodities is only 32,778 kW/h in the whole year.

Heat treatment, heat insulation and heat preservation time of forging aluminum alloy production process

The length of heat insulation time of forged aluminum depends on the time required for complete melting of strengthening phase. Transit aluminum xiaobian proposes to reduce the heat treatment as much as possible under the premise of considering the heat treatment regulations, so that finer crystals can be obtained. Generally speaking, aluminum alloy profiles are heat-insulated for 1 hour every 25mm. The reasonable thickness of guide impeller is 65mm, and the reasonable thickness of compressor centrifugal impeller is 54 mm. According to the analysis of the reasonable thickness and deformation level of goods, the original processing technology has a long heat insulation time, which can be completely reduced.

Forging process of aluminum alloy

Outside the furnace, oil stains and other wastes should be removed from the aluminum alloy forging blank, and it is not allowed to be mixed with the slab in the furnace to prevent the iron filings and air oxidized iron filings from being mixed together and easily exploding. Transit aluminum xiaobian specially reminds everyone that the blank should not touch the heating components when loading the furnace to prevent short circuit and damage the heating components. The blank in the furnace is placed 250-300mm away from the furnace mouth to ensure the heating symmetry. A thick steel plate is placed between the blank and the electric heating wire to avoid the blank from overheating during heating.

Aluminum alloy profiles have excellent heat transfer, and all thin and thick blank need not be heated, but can be heated immediately in a high-temperature electric furnace, and the regular blank is heated to the limit of aluminum alloy forging temperature. In order to ensure the full melting of the reinforced phase, the heating time is still longer than that of the slab, which can be calculated according to the diameter (or thickness) of each millimeter, which takes about 1.5min. In view of whether it is necessary to insulate the extruded blank or cold-rolled blank after it is heated to the open forging temperature, the criterion is that there will be no cracks during aluminum alloy forging and free forging, while the casting must be insulated.

Deformation rate and deformation degree

The deformation rate has no great harm to the plastic deformation of most local aluminum alloy profiles, and the plastic deformation is obviously reduced only when some aluminum alloy profiles strengthened with high fine grains are formed at high speed. In addition, when connecting from low deformation rate to high deformation rate, the deformation resistance is different with the fine grain strengthening degree of aluminum alloy, which is about 0.5-2.0 times. Therefore, aluminum alloy forging can be carried out at both low deformation rate and high deformation rate. However, in order to better expand the allowable deformation degree, improve consumption rate, reduce deformation resistance and improve the fluidity of aluminum alloy filling die, it is better to use press and free forging to carry out aluminum alloy forging than hammer forging. For large and medium-sized aluminum alloy profiles, steel castings and die forgings, especially in this way.

When aluminum alloy profiles are forged on a high-speed hammer, the temperature rise (about 100℃) of aluminum alloy during forging is more significant because of the large deformation rate, large rolling friction and large thermoelectric effect. Therefore, Xiao Bian suggested that the initial forging temperature of aluminum alloy forging should be adjusted in many ways, and the heating temperature of blank before forging should take the lower limit of the initial forging temperature originally requested.

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