Investment casting, also known as lost wax casting, includes pressing wax, repairing wax, grouping trees, dipping, melting wax, casting molten metal, and post-processing. Lost wax casting is a wax mold made from wax to make parts, and then the wax mold is coated with mud. This is the mud mold. After the clay mold is dried, it is baked into a ceramic mold. Once roasted, the wax mold was completely melted and lost, leaving only the ceramic mold. In general, a casting port is left when a mud mold is made, and a molten metal is poured from the pouring port. After cooling, the required parts are made.