Cable Wire Machine Screw Barrel

Cable wire machine screw barrels are essential components in wire and cable extrusion equipment, designed to melt, mix, and extrude thermoplastic materials into various types of wires and cables. These screw barrels play a crucial role in achieving uniform insulation thickness, controlled cooling, and precise dimensional accuracy required for different cable specifications.

The cable extruder screw is a core component specifically designed for silicone cable manufacturing equipment; it is responsible for conveying, compressing, melting, and plasticizing solid silicone raw materials, and then extruding them uniformly to form a continuous cable insulation layer or sheath.

In terms of structural design, this type of screw typically adopts a single-screw configuration:

Single-Screw Extruder Screw: Characterized by a simple structure, it is suitable for standard silicone cable production. The screw is generally divided into a feeding section, a compression section, and a homogenization section; through variations in screw channel depth or pitch, it facilitates the gradual compaction and plasticization of the material.

Regarding materials, these screws are predominantly manufactured using high-strength, corrosion-resistant, and wear-resistant alloy steels—such as 38CrMoAlA and 9Cr18—and undergo nitriding treatment to extend their service life. Some high-end products also feature chrome-plated surface treatments to enhance anti-stick properties and durability.

In practical applications, the screw must operate in conjunction with the barrel, die head, temperature control system, and other components to ensure that the silicone flows uniformly under high temperature and pressure, and is properly formed as it passes through the die. With a length-to-diameter ratio of 10:1, the screw features a design with variable pitch and variable depth; it boasts a compression ratio of 1:2.5, making it highly suitable for the extrusion of silicone rubber with a hardness ranging from 45 to 75 Shore A.

Specification

Material	38CrMoAlA	Straightness	0.015mm/m
Hardness after quenching and tempering	HB240-280	Inside & outside diametre tolerance	≤0.02mm
Hardness after nitridation	HV900-1000	Circular run-out	<0.04mm
Depth of nitrided layer	0.5-0.7mm	Screw length tolerance	≤0.03mm
Brittleness after nitridation:	≤second level	Key &spine tolerance grade	Grade 7

Our Benefits
1. Precision Melt Control and Mixing
Injection molding machine screw barrels ensure precise melt control and thorough mixing of additives, colorants, and fillers into the polymer melt. This results in uniform melt quality and enhanced part aesthetics.
2. Extended Service Life and Durability
Our screw barrels are manufactured from high-quality materials, including nitrided steel, bimetallic alloys, and tungsten carbide coatings, to withstand abrasive wear and corrosion. This ensures extended service life and reduced maintenance downtime.
3. Optimized Injection Molding Parameters
By optimizing screw design and material selection, our screw barrels enhance injection molding parameters such as cycle time, shot size consistency, and part dimensional stability. This improves overall production efficiency and reduces scrap rates.
4. Customization Options
We offer customization options to meet specific customer requirements, including screw diameter, length-to-diameter ratio (L/D), flight geometry, material composition, and surface treatments. Our engineering expertise ensures that each injection molding machine screw barrel is optimized for maximum performance and reliability.