What are the details of casting copper castings?
The so-called investment casting process only requires the use of fusible materials to make a fusible model, then coating several layers of special refractory coating, and then drying and hardening. Shell, the model in the shell is melted by steam or hot water, and then put into the sandbox, and filled with dry sand around it, and then the mold is put into the oven and baked at high temperature. After the mold or shell is fired, the molten metal is poured into it to obtain the casting.
The precision of precision casting is high. Of course, due to the disordered process of precision casting, there are many factors affecting the precision of casting scale. The surface shape of the cavity is very high due to the use of finish machining, so the surface finish of investment mold is high. Relatively high.
In addition, the enclosure is made of special adhesive and high temperature resistant refractory. The internal and external surface of the cavity which is in direct contact with the molten metal has high fire resistance. Surface finish. Therefore, the surface finish of investment casting is higher than that of conventional casting.
The advantage of precision casting is high oxide scale size and surface finish, so it can reduce the processing workload, but the number of parts is also higher. Parts can have some machining allowance. Even some castings need only polishing and polishing, and can be used without machining.
Another advantage of investment casting method is that it can be used to cast various kinds of disordered castings, especially for superalloy castings. The precision casting technology can not only realize mass production, but also ensure the consistency of casting and avoid the stress concentration of residual tool after machining.