Advanced equipment is certainly an indispensable factor to ensure product quality, but the role of molds in casting is also very important. Especially for aluminum alloy auto parts manufacturers, mold accuracy and durability of product quality is very obvious.

Ferrous metal casting, the mold is more for the formation of the casting cavity, the general situation of the mold itself is not directly in contact with the metal liquid, especially for the complex shape of the non-metallic mold casting is more so, with the hot metal liquid contact with the molding material, mainly sand, which makes the molding material to become the main factors affecting the quality of castings. The aluminum alloy gravity casting is different, due to the low melting point of aluminum alloy, casting performance is good, in mass production, the shape of the casting is generally formed directly by the mold, such as engine aluminum alloy cylinder block, cylinder head, etc., which is not only conducive to improving labor productivity, but also, and more importantly, through the adjustment of the temperature distribution of the different parts of the mold to control the casting of the organizational structure and grain size, to improve the quality of casting, and at the same time. At the same time, it avoids the environmental pollution brought about by the use of a large number of molding materials and improves the labor conditions in the workshop.

With the casting shape complexity is different, aluminum alloy gravity casting molds are also different. Even the same parts, using different casting process, mold form is often different, but in any case, aluminum alloy gravity casting mold still has its commonality.

First of all, we must choose the appropriate casting process, casting process is directly related to the quality of castings and process yield rate is high or low. Some domestic mold manufacturers, has begun to use solidification simulation to casting process aids design, through the filling and solidification process of computer simulation, found easy to produce casting defects in the hot knot parts and to be overcome, which improves the reliability of the casting process design, and effectively prevents the mold in the commissioning process of unnecessary rework, is very important and effective.

Secondly, the mold should have good heat capacity. Meet the requirements of the thicker mold frame and module, not only is the effective guarantee of the mold life, but also for the mold continuous working process of temperature field regulation are very important role. Some mold factory, in order to reduce costs, save material, and reduce the effective thickness of the mold in order to achieve the purpose of reducing the weight, do not know that this not only greatly reduces the service life of the mold, but also make the casting is easy to deformation, affecting the casting dimensional accuracy, and in serious cases will lead to casting batch scrapping, to the foundry losses, and more serious is the damage to the mold factory's own reputation.

Third, the mold should have a more reliable cooling system and air extraction system. Through the cooling, not only can effectively improve labor productivity, but also can adjust the casting temperature field, control the casting cooling rate, and then affect the internal organization of the casting structure and grain size, to achieve effective control of the casting mechanical properties of the purpose. As the name suggests, pulling gas, is to artificially exhaust the gas inside the cavity to the outside of the cavity in order to reduce the possibility of castings to produce porosity defects. At the same time, through the addition of exhaust plugs can also modulate the local small area of the mold temperature, to prevent and overcome the aluminum alloy cracking and shrinkage has a very important role.

Fourth, there must be a mold positioning device and a convenient mold installation system that matches the casting machine. Positioning device is not only the key to ensure that the casting size, reduce phi seams and burrs, but also to ensure that the casting machine is working properly, it can be said that the mold does not have a good positioning device, there is no good qualified castings. The mold must be easy to install and disassemble, because aluminum alloy gravity casting, every certain period of time must be removed from the mold to re-spray paint and repair the mold, if the disassembly is not convenient, it is bound to increase the labor intensity of the workers, take up more labor time, reduce the output and efficiency.

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Sales Manager: Zach

Email: pan@casting-aluminum.com