What are the process characteristics of die casting moulds?

Die-casting mould is one of the three elements of die-casting production, the correct and reasonable structure of the mould is a prerequisite for smooth die-casting production, and plays an important role in ensuring the quality of the casting (down the machine pass rate).

Due to the characteristics of the die-casting process, the correct choice of process parameters is the decisive factor in obtaining high quality castings, and the mould is able to correctly select and adjust the process parameters of the premise, mould design is essentially a comprehensive reflection of the various factors expected to occur in die-casting production. If the mould design is reasonable, the actual production problems encountered in less, castings under the machine qualified rate is high. On the contrary, the mold design is unreasonable, example a casting design when the dynamic fixed mold wrapping force is basically the same, and the pouring system is mostly in the fixed mold, and placed in the pressure injection after the punch can not feed the filling die-casting machine on the production, can not be normal production, the casting has been stuck in the fixed mold.

Although the cavity of the fixed model of the finish hit very light, because the cavity is deeper, still appear sticky in the fixed mold phenomenon. So in the mold design, must be a comprehensive analysis of the structure of the casting, familiar with the operation process of the die-casting machine, to understand the die-casting machine and the possibility of adjusting the process parameters, to master the filling characteristics in different cases, and consider the mold processing methods, drilling and fixed form, in order to design a realistic, to meet the production requirements of the mold. As already mentioned at the beginning, the extremely short filling time of the metal fluid, the high specific pressure and flow rate of the metal fluid, the extremely harsh working conditions for the die casting mould, combined with the impact of the alternating stresses of cold and heat, all have a great impact on the service life of the mould. The service life of the mould is usually through careful design and manufacture, in the normal use of the conditions, combined with good maintenance under the natural damage, in can not be repaired and scrapped before, the number of die-casting die (including the number of scrap in die-casting production).