Use steel-bonded cemented carbide materials to make screw molds. Steel-bonded cemented carbide is a new type of mold material cemented carbide rotary file, which uses one or several carbides (titanium carbide, tungsten carbide) as the hard phase. Therefore, it is advisable to use the insert form to appear in the mold. The powder metallurgy material cemented carbide rotary file is made by batching, mixing, pressing and sintering. Its performance is between steel and cemented carbide. It not only has high strength, toughness, but also can be subjected to various mechanical processing and thermal processing. Processing, and has the high hardness of cemented carbide (after quenching and tempering can reach (68 ~ 73) HRC, high wear resistance cemented carbide rotary file. Therefore, it is very suitable for manufacturing various molds, but due to the hard Alloy and steel-bonded cemented carbide are expensive. Cemented carbide rotary burs are used to increase the service life of molds, save materials and reduce costs. Alloy steel (such as high-speed steel, chromium-molybdenum steel) powders are used as binders for cemented carbide rotary burs.