Screw material classification of injection molding machine
1. HPT fully hardened powder alloy screw
The tool steel is made of tungsten-cobalt powder alloy and is formed by a special process of overall hardening treatment. The internal and external hardness of the screw is the same, reaching about HRC65°. It is suitable for processing various transparent products, precision products, and special high-temperature and highly corrosive plastics such as LCP, PPS, PES, PPA and other fiber-added products.
2. Double alloy screw
Using SACM645, 38CrMoAlA as the base material, and then ion spray welding tungsten carbide nickel-based alloy on the tooth crest or screw groove, the surface hardness of the screw is about HRC60°. It is suitable for processing various transparent products and engineering materials such as PA6 and PA66 with added fiber.
3. Electroplating screw
Using SACM645, 38CrMoAlA as the base material, after forming, the outer surface is electroplated with a layer of hard chromium, nickel, titanium and other elements. The hardness is around HRC60°. Suitable for processing PC, PMMA, PET transparent materials and corrosive plastic U-PVC materials.
4. Stainless steel screw
The material is 9Cr18MoV special stainless tool steel, which adopts overall quenching + overall hardening treatment, and the overall hardness is about HRC55°.
5. SKD61 screw
Using Hitachi SKD61 material, processed by a special process, the product has good toughness and strong torsion resistance.
6. Ordinary nitriding screw
Using SACM645, 38CrMoAlA as the base material, it is formed by a special process, the depth of the nitrided layer is 0.5-0.8mm, and the overall hardness is HV980~1080°. Suitable for processing ordinary plastics, such as PP, ABS, PS, AS, PVC and other ordinary plastics.