First of all, 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 production rate of the process. Some mold manufacturing factories in China have begun to use the solidification simulation to carry out the casting process auxiliary design. Through the computer simulation of the filling and solidification process, the hot junction parts which are easy to produce casting defects are found and overcome, which is reliable for improving the casting process design. It is very important and effective to prevent the mold from being reworked unnecessarily during the commissioning process.
Second, the mold should have good heat capacity. The thicker formwork and modules that meet the requirements are not only an effective guarantee for the life of the mold, but also have a very important role in the adjustment of the temperature field during continuous working of the mold. In order to reduce the cost and save the materials, some mold factories blindly reduce the effective thickness of the mold to achieve the purpose of reducing the weight. However, this not only greatly reduces the service life of the mold, but also makes the casting easy to deform and affects the dimensional accuracy of the casting. It will lead to the scrapping of castings, causing damage to the foundry and, more seriously, the reputation of the mold factory itself.
Third, the mold must have a more reliable cooling system and a gas extraction system. Through cooling, not only can labor productivity be effectively improved, but also the temperature field of the casting can be adjusted, and the cooling rate of the casting can be controlled, 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, the gas is extracted artificially to discharge the gas inside the cavity to the cavity to reduce the possibility of pore defects in the casting. At the same time, the mold temperature can be adjusted in a small area by adding a vent plug, which plays an important role in preventing and overcoming the cracking and collapse of the aluminum alloy.
Fourth, there must be a mold positioning device that matches the casting machine and a convenient mold mounting system. The positioning device not only ensures the casting size, reduces the crevice and burr, but also ensures the normal operation of the casting machine. It can be said that there is no good positioning device without a good positioning device. The mold must be easy to install and disassemble. Because of the gravity casting of aluminum alloy, it is necessary to remove the mold to re-spray the paint and repair the mold at regular intervals. If the disassembly is inconvenient, it will increase the labor intensity of the workers and take more labor time and reduce. Yield and efficiency.