Manufacturing Process of Screw and Barrel

The manufacturing process of the screw and barrel is relatively complex, involving multiple stages such as material selection, machining, and heat treatment. The screw is typically made of alloy steel such as 38CrMoAlA, while the barrel often uses carbon steel or alloy steel with a bimetallic lining to improve wear resistance. During machining, it is necessary to ensure the dimensional accuracy and surface finish of both the screw and barrel to ensure uniform clearance between them and prevent material leakage or accelerated wear. Heat treatment processes such as nitriding can further improve surface hardness and corrosion resistance.