Generally speaking, if there is something higher on the side of the mold facing the ground, it is necessary to make several cylinders or squares to make the mold parallel. This is called formwork, but some people will also call square iron formwork, but these two parts are different.

Mold is a variety of molds and tools used in industrial production to obtain the required products by injection molding, blow molding, extrusion, die casting or forging, melting, stamping and other methods. In short, molds are tools used to shape objects. This tool is composed of various parts, and different molds are composed of different parts. It mainly realizes the processing of the shape of the article by changing the physical state of the molding material. Known as the "mother of industry".