3. Gypsum forging
Precision forging is often used to make steel parts from rapid prototyping. However, for low-melting metal parts, such as aluminum-magnesium alloy parts, gypsum forging, the efficiency is higher. At the same time, the quality of the casting can be effectively guaranteed, and the forging power is higher. In the gypsum forging process, the rapid prototyping is still a mold that can disappear, and the gypsum mold is thus obtained to obtain the desired metal parts.
The first step of gypsum forging is to make a lost mold by using a rapid prototyping piece, and then embedding the rapid prototyping lost mold in the gypsum slurry to obtain a gypsum mold, and then placing the gypsum mold into a cultivating furnace for burning. In this way, the rapid forming lost mold is decomposed by pyrolysis, and the whole disappears completely. At the same time, the plaster mold is dried and hardened, and the process generally takes about two days. Finally, the molten aluminum alloy is injected into the plaster mold in a special vacuum casting equipment. After cooling, the plaster mold is broken to obtain a metal piece.
This method of producing metal parts is very low in cost, and generally only 2% to 5% of the production of die-casting molds. The production cycle is very short, usually only 2 to 3 weeks. The function of gypsum castings can also be compared with precision castings, because the casting is done in a vacuum environment, so the function is even better than ordinary precision forging.