According to foreign data reports: in the extrusion and injection molding processing of plastic products, a problem often encountered is the rapid wear and corrosion of screw and barrel, and many conditions are in about half a year, or even in two or three months, the screw and barrel are worn and corroded to the need to replace the situation, which forces the plastic molding processing industry to pay attention to the screw and barrel The strengthening methods of wear resistance and corrosion resistance are discussed more deeply.

In recent years, in order to improve the wear resistance and corrosion resistance of screws and barrels, great progress has been made in the study of corrosion-resistant strengthening methods for screws and barrels, which are mainly reflected in: new raw materials for making screws and barrels The research and development of new mechanical manufacturing technology and new heat treatment technology are transplanted into the manufacturing process of screw and barrel. The brief situation in this regard is: In the 1950s, the first choice of medium carbon steel, alloy steel for surface quenching, chromium plating or chromium plating after quenching, etc.; after this, alloy steel, nitride steel and other materials are used for gas Nitriding treatment: After entering the 1970s, in addition to the continuous use of nitrided steel for gas nitriding treatment, more and more methods such as nitriding are used, and medium carbon steel and alloy steel are used for chromium plating. There are obvious additions; the new technology of spraying and surfacing wear-resistant and corrosion-resistant alloys on the top surface of the screw teeth and even the entire screw spiral surface is widely used. For some special conditions, pure nickel is used to make the screw; As for the barrel, the new process of making the barrel body with materials such as cast iron, medium carbon steel or alloy steel is widely used, and then the inner hole wall is cast with special alloy fabrics resistant to wear and corrosion.

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