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Gravity casting mold refers to the use of other easily formed materials to pre create the structural shape of a part in order to obtain its structural shape. The mold is then placed in a sand mold to form a cavity with the same structural size as the part. The liquid is then poured into the cavity, and after the liquid cools and solidifies, a part with the same shape and structure as the mold can be formed.
Due to the complexity of the casting shape, aluminum alloy gravity casting molds also differ. Even if different casting processes are used for the same part, the mold form often varies. However, aluminum alloy gravity casting molds still have their commonalities
Firstly, it is necessary to choose a suitable casting process. The quality of the casting process is directly related to the quality of the casting and the output of the process. Some domestic mold manufacturers have started using solidification simulation to assist in the design of casting processes
Through computer simulation of mold filling and solidification process, it is of great significance to find out and overcome the hot junction parts that are easy to produce Casting defect
Secondly, the mold must have a good heat capacity, and a thick mold base and module set that meet the requirements are not only an effective guarantee of the mold's lifespan, but also play a very important role in regulating the temperature field during the continuous operation of the mold
Some mold factories blindly reduce the effective thickness of molds to reduce weight in order to reduce costs and save materials. However, they are unaware that this not only greatly reduces the service life of molds, but also makes castings prone to deformation, affecting the dimensional accuracy of castings. This will lead to batch scrapping of castings, causing losses to the foundry and even seriously damaging the reputation of the mold factory itself
Third, the mold must have a more reliable cooling system and air extraction system. By cooling, not only can labor productivity be effectively improved, but also the temperature field of castings can be adjusted, the cooling rate of castings can be controlled, and the internal structure and grain size of castings can be affected. The purpose of effectively controlling the mechanical properties of castings
As the name suggests, air extraction is the manual discharge of gas from the inside of the mold cavity to the outside of the mold cavity, in order to reduce the possibility of porosity defects in the casting. At the same time, by adding breathable plugs, the mold temperature can be adjusted in a small range, which plays an important role in preventing and overcoming cracking and settlement of aluminum alloys
Fourthly, there must be a mold positioning device that matches the casting machine and a convenient mold installation system. The positioning device is not only the key to ensuring the size of the casting, reducing cuts and burrs, but also the key to ensuring the normal operation of the casting machine. It can be said that if the mold does not have a good positioning device, there will be no qualified castings
The mold must be easy to install and disassemble, as aluminum alloy> Aluminum alloy gravity casting, gravity casting molds must be regularly removed for repainting and repair. If disassembly is not convenient, it will inevitably increase the labor intensity of workers, occupy more labor time, and reduce production and efficiency