Bimetallic screw and barrel double-metal process is more frequently used in recent years, a corrosion resistance, excellent abrasion resistance and process combination product with High-Speed ??HVOF spraying device for spraying spraying on the surface of the screw, to obtain a dense structure of the double metalscrew; bimetallic barrel using a cast, high tungsten carbide composition of the alloy cylinder cast one, use the special technology, precision molding. |