Bimetallic screw application on extrusion blow molding machine

The bimetallic screw is actually called the double alloy screw. It is an accessory used on the injection molding machine or blow molding machine. The bimetallic screw is electroplated with a layer of alloy on the surface of the ordinary screw. The role of the alloy is mainly to enhance the corrosion resistance and wear resistance of the bimetallic screw. Otherwise, bimetalliclic screw is also used for bakelite machinery, extrusion machinery, blow molding machinery, film blowing machinery, pelletizing machinery, extrusion machinery, pipe machinery, sheet machinery, wire machines, Cable machines and other mechanical equipment.

Yes, this is the picture for bimetalliclic screw, there is an alloy layer on the thread top surface.

Special Coatings: Ti-Coating, Hard Chrome Plating, Carbide Coating
Manufacture Methods: PTA/HOVF
Hardness HRC 50 / 60;
Hardness layer reaches 1.5 m/m thickness;
Hardness does not decrease with depth;
Hardness does not decrease under normal temperature;
Outstanding wear-resistance and corrosion-resistance;
Abrasion wear resistance on the hardened layer is 2~3 times higher than that treated by conventional heat treatment.
The PTA(Plasma Transferred Arc) powder plasma welding applies the positive and negative electrodes of arc welding, allowing the welding path to be completely welded with the base material. The minimum possibility of the welding path becoming less rigid fully prevents the welding layer from peeling off – thereby effectively upgrading the life time of the screws.

PTA utilizes Nickel-based alloys and Cobalt-based alloys and its chemical composition includes Ni, WC, CO, Fe, Si, B, Cr and C.

Bimetallic screw is made of 88wc/12c0.Crc/25Nicr.XaloY108 material and is subjected to integral quenching treatment. It is suitable for all kinds of added glass fiber, plastic and PPA, PO, PPS, LCP, ABS, fireproof, bakelite, magnetic powder, PC. Special engineering plastics. It solves the troubles of chrome-plated screws often falling off the chrome-plated layer for the end users, and completely guarantees the environmental protection requirements of products. It is your ideal helper.
Production use: injection molding machine / extrusion machinery / bakelite machinery.

Processing range: inner diameter ф20mm-ф250mm
Effective length: 8000mm
Alloy composition: 88wc/12c0.Crc/25Nicr.XaloY108
Nitriding hardness: HRC59°-65°

The role of other nitriding material injection molding machine screw barrels is:
1. Nitriding can make the surface of the screw barrel have higher hardness and wear resistance. For example, the hardness of the surface of the screw barrel made of 38CrMoAlA high-quality alloy steel after nitriding can reach HV950 or above, equivalent to HRC=55°. -58°, and the high strength and high wear resistance after nitriding are maintained at 350-450 ° C without significant changes
2, can improve the fatigue resistance. Due to the formation of greater compressive stress in the nitride layer, the screw barrel exhibits higher fatigue limit and lower notch sensitivity under the alternating load, nitriding The fatigue limit of the rear screw barrel can be increased by 30%.
3, improve the corrosion resistance of the workpiece, due to nitriding to form a layer of dense, chemically stable phase layer on the surface of the screw, high corrosion resistance in water vapor and alkaline solution, such nitriding method Simple and economical, it can replace galvanizing, bluing, and other chemical coatings. In addition, some screw barrels are nitrided, which not only improves wear resistance and corrosion resistance, but also reduces the stickiness of mechanical and screw barrels. The phenomenon of mixing, extending the working life of the machine.

In blow molding production, a large amount of burr waste will be produced, about one-third of the raw materials are waste, which are generally crushed and reused.

However, this kind of recycled material generally contains various impurities, such as small rocks and iron scraps. Because of these impurities, ordinary screws are easily worn out and cannot be used. So this uses a bimetallic screw. take this bimetallic screw, you can reuse this recycled plastic material or even you can add some glass fiber, plastic and PPA, PO, PPS, LCP, ABS, fireproof, bakelite, magnetic powder, PC, or other Special engineering plastics on blow molding. it’s just depends on your requirement.

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