rotary mold box is the slow rotation of the mold itself when the steel wire is pulled. the lubricating powder is forced into the mold by the screw type, which increases the powder-filling effect, prolongs the service life of the mold and reduces the friction coefficient between the mold and the steel wire. electricity is about 5%. at the same time, the wear of the steel wire is avoided to the wear point of the mold, and the mold is saved by more than 10%. the wire has good roundness. the lubricating powder that is melted or carbonized at the inlet is driven to be diluted or extruded, and the new lubricating powder is continuously entered into the mold, and the yield of the steel wire is increased by more than 20%.