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How to choose and use injection molding machine screw

writer:LI SONG Share

Screws of injection molding machines are mainly divided into the following types according to their materials:

1. HPT full-hardened powder alloy injection molding machine screw: adopts tungsten-cobalt powder alloy tool steel 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, accurate products, and special high temperature and high corrosive plastics such as LCP, PPS, PES, PPA and other fiber-added products.

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2. Double alloy injection molding machine screw: use 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 fiber added.

3. Electroplating injection molding machine 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 injection molding machine screw: The material is 9Cr18MoV special stainless tool steel, with overall quenching + overall hardening treatment, and the overall hardness is about HRC55°.

5. SKD61 injection molding machine screw: using Hitachi SKD61 material, shaped by special process, the product has good toughness and strong torsion resistance.

6. Ordinary nitriding injection molding machine screw: using SACM645, 38CrMoAlA as the base material and forming by special process, the depth of the nitriding layer is 0.5-0.8mm, and the overall hardness is HV980~1080°. Suitable for processing common plastics, such as PP, ABS, PS, AS, PVC and other common plastics.

Injection molding machine screws can be generally divided into feeding section, compression section, and homogenization section (also called metering section). (Note: The ratio of the three sections of different screws is different, the depth of the screw groove is different, and the transition form of the screw bottom diameter is different)

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