What are the steps of the investment casting process？

As for the investment casting process, the investment casting process design is one of the most important links in the whole process, which is of great significance for the whole process due to its high technical difficulty. This link has more professional and technical operations. The process includes degreasing and degreasing, coating and sanding, drying and hardening of the shell, melting and melting of the shell, and roasting of the shell. The following is a detailed introduction to these processes.

Here is the content:

Degreasing

Hang paint and sand

The shell is dried and hardened

Melting die in the self-shaped shell

Roasting shell

Degreasing

The purpose of degreasing is to improve the wettability of the coating on the die surface. When wax-based molds are used for investment casting, oil stains on the surface of the molds should be removed. In this way, the products produced by investment die will not have cracks and other defects.

Hang paint and sand

Before painting, the coating should be mixed evenly to reduce the deposition bucket refractory. Then adjust the viscosity and density of the paint. Wrap up the coating and wet module first, repaint and soak your module. This will make paint a good wet module and evenly cover the surface of the group. After the coating is coated, sand can be scattered.

The shell is dried and hardened

In the investment casting process, the shell needs to be dried and hardened. When each is coated with a good layer of the shell, it is necessary to dry and harden it, so that the coating binder from sol to gel, gel transformation, the refractory together. In this way, the products manufactured by investment die are not easy to crack and other defects. This step is arguably the most important part of the whole process, so care is needed in this operation.

Melting die in the self-shaped shell

Another important step in an investment casting plant is to melt the mold from the mold shell. When the mold shell is completely hardened, it is necessary to melt the mold from the mold shell, because the mold is usually made of wax-based mold material, so this process is also called dewaxing. According to the different heating methods, there are a lot of, take-off wax methods, with more is hot water law and the same pressure steam law.

Roasting shell

If molding (sand filling) casting is required, before roasting, the molded shell should be buried in the sand in the box and then roasted in the furnace. Such as shell high-temperature strength, do not need modeling casting, can be molded shell directly into the furnace roasting. When roasting, gradually increase the furnace temperature, heat the shell to 800-1000℃, hold it for a while, and then pouring can be carried out.

As for the investment casting process, process design is one of the most important links in the whole process. The technical difficulty coefficient of this link is the most difficult in the whole investment casting process. This is why this link is the focus of many professional and technical research, but also the core of investment foundry research.