Aluminum casting can be used immediately after machining due to its advantages of precise size and bright surface. As a result, it not only increases the rate of metal application, but it also reduces the cost of processing equipment and casting. To save assembly time and metal, a combination of die casting and other metal or nonmetal materials is used. Although aluminum casting has many benefits, it does have some flaws that must be addressed. For example, in die casting, the state is unstable due to the high filling speed of liquid metal, so the standard die casting method is used. Die-casting for castings with complex concave is difficult. Die casting die life is low for high melting point alloys such as copper and ferrous metals; it is not suitable for small batch consumption. The main reason for this is that aluminum casting is expensive, die casting machines have a high consumption efficiency, and small batch consumption is uneconomical.
Cast aluminum has a lower density than cast iron and cast steel, but it has a higher specific strength. As a result, aluminum alloy casting can reduce the weight of a structure under the same load conditions, and it is widely used in the aviation industry, power machinery, and transportation machinery manufacturing. Aluminum alloy is widely used in the manufacture of civil utensils because of its attractive luster and good corrosion resistance in both the atmosphere and fresh water. Aluminum castings are also useful in the chemical industry because pure aluminum has good corrosion resistance in oxidizing acid medium such as nitric acid and acetic acid. The thermal conductivity of pure aluminum and aluminum alloys is excellent. Heat exchangers used in the chemical industry, as well as parts in power machinery that require good thermal conductivity, such as the cylinder head and piston of an internal combustion engine, can be made with aluminum alloy.
The casting properties of the cast aluminum parts are excellent. Metal mold and pressure casting can be widely used to improve the internal quality, dimensional accuracy, appearance brightness level, and consumption efficiency of castings due to their low melting point (the melting point of pure aluminum is 660.230oC, and the pouring temperature of aluminum alloy is around 730-750oC). The solidification time of aluminum liquid is much longer than that of cast steel and cast iron under the same weight condition due to its high latent heat of solidification, and it has good mobility, making it ideal for casting thin-walled and complex castings.
Aluminum die casting has numerous advantages, making it the casting industry's preferred development direction and one of the most popular casting products among customers. With the advancement of aluminum casting technology, it will be able to demonstrate its style on a larger scale in the future.
Heating, heat preservation, and cooling are all parts of the heat treatment process for aluminum castings. Several parameters can be used to describe the entire process, including the heating rate, heating temperature, holding time, cooling rate, and heat treatment cycle. Temperature is a critical component of every heat treatment process specification. The heat treatment process specification cannot be carried out correctly if the temperature measurement is not accurate, resulting in a reduction in aluminum casting quality or even scrap. The key to the heat treatment process is temperature measurement and control, as well as the most important factor influencing deformation. Another important deformation reason is the influence of the cooling process on the deformation of aluminum castings after quenching. The thin part always cools faster than the thick part during the cooling process of metal after heat treatment. In order to meet actual production needs, the gap between the thickness of the workpiece and the cross section of the parts should be as small as possible, and the cross section of the parts should be uniform to reduce distortion and cracking in the transition zone caused by stress concentration. Reverse deformation and a pre-expanding hole at the shrinkage end are used to improve the qualified rate of deformation after quenching, according to the deformation law of aluminum casting after heat treatment.
What is the best way to store aluminum castings?
1. Sand cast aluminum castings must be stored in a ventilated, dry, and non-corrosive environment; rain must be kept at bay.
2. Other chemical elements should not come into contact with sand cast aluminum castings. Chemical elements will react with sand cast aluminum castings when they come into contact with other chemical elements, causing sand cast aluminum castings to be damaged.
3. Every sand cast aluminum casting has a distinct shape. When placing the zinc alloy sand cast aluminum die casting products, we should customize the special suction tray according to the shape of each sand cast aluminum casting product, ensuring that the sand cast aluminum casting parts are placed in a specific position, ensuring that the sand cast aluminum casting parts are intact and will not be altered in any way.
4. Zinc is a metal that has a high level of activity. It is simple to oxidize when the temperature reaches the corresponding conditions. As a result, when storing zinc alloy sand casting aluminum products, it's important to keep an eye on the temperature and keep them out of direct sunlight.
5. If the raw alloy ingot for casting zinc alloy products is wet, it should be dried before adding it to avoid blasting injuries or equipment damage during melting.