The development direction of aluminum alloy gravity casting mold!

Advanced equipment is to ensure the quality of products essential factors, but the role of the mold in casting is also very important. Especially for aluminum alloy auto parts manufacturing enterprises, the accuracy and durability of die have a very obvious impact on product quality.

Ferrous metal casting, mold is more in order to form the mold cavity, generally the mold itself is not direct contact with the liquid metal, especially for complex shape of the metal mould casting, is in contact with the hot metal molding materials, mainly sand, this makes the molding materials become the main factors influencing the casting quality. And aluminum alloy gravity casting is different, because of the aluminum alloy with low melting point, good casting performance, when mass production, the appearance of the casting is generally formed directly by the mould, such as the engine of the aluminum alloy cylinder block, cylinder head, etc., it is not only beneficial to improve the labor productivity, and more importantly, by adjusting the temperature distribution from different parts of the mold, to control the casting of the organizational structure and grain size, Improve the casting quality, at the same time, avoid the use of a large number of molding materials and bring about environmental pollution, improve the workshop working conditions.

With the different degree of complexity of casting shape, aluminum alloy gravity casting mold is also different. Even if the same part, using different casting process, mold form is often different, but in any case, aluminum alloy gravity casting mold or has its common.

First of all, we must choose the right casting process, casting process is directly related to the quality of casting and process yield. Domestic some mould maker, has started to use solidification simulation for casting process cad, through computer simulation of the filling and solidification process, easy to produce the casting defects of hot junction area and be overcome, to improve the reliability of casting process design, effectively prevent mold in the process of debugging unnecessary rework, it is very important and effective.

Secondly, the mold should have good heat capacity. The thick mold frame and module that meet the requirements not only guarantee the life of the mold effectively, but also play a very important role in adjusting the temperature field in the continuous working process of the mold. Some mold factory, in order to reduce costs, save materials, reduce blindly the effective thickness of the mold to achieve the purpose of reducing weight, but this not only greatly reduce the service life of the mold, and make the casting is easy to deformation, affect the casting dimension accuracy, serious when will lead to casting batch scrap, losses to foundry, more serious is that damage the mold factory's own reputation.

Third, the mold should have a more reliable cooling system and air extraction system. By cooling, not only labor productivity can be effectively improved, but also casting temperature field can be adjusted to control the cooling rate of the casting, thereby affecting the internal structure and grain size of the casting, and achieving the purpose of effectively controlling the mechanical properties of the casting. As the name implies, gas extraction is to artificially exhaust the gas inside the cavity out of the cavity to reduce the possibility of porosity defects in the casting. At the same time, by installing exhaust plug can also adjust the mold temperature of local small area, to prevent and overcome aluminum alloy cracking and shrinkage has a very important role.

Fourthly, there must be a mold positioning device and a convenient mold installation system matching the casting machine. The positioning device is not only the key to ensure the casting size, reduce the seam and burr, but also the key to ensure the normal work of the casting machine. It can be said that there is no good positioning device in the mold, there is no good qualified casting. The mold must be easy to install and disassemble, because aluminum alloy gravity casting, every certain time must remove the mold to spray paint and repair the mold, if the disassembly is not convenient, is bound to increase the labor intensity of workers, occupy more labor time, reduce production and efficiency.