Advanced Specifications for Extruder Screw and Barrel Technology

The evolution of extruder technology necessitates a closer look at the processing requirements for screws and barrels. Achieving optimal performance demands a combination of anti-corrosion, wear-resistant alloy steel, and meticulous processing techniques. In the current landscape, China predominantly employs 38CrMoAl, 400, or 45# steel for these critical components.

Alloy Selection for Durability:

To enhance longevity and resist corrosion, it is imperative to manufacture extruder screws and barrels using anti-corrosion and wear-resistant alloy steel. Presently, the prevalent choices in China include 38CrMoAl, 400, or 45# steel.

Forged Blank Precision:

Emphasizing precision, the blank for the screw barrel undergoes a forging process. This step is crucial for ensuring the structural integrity and overall durability of the extruder.

Quenching and Tempering for Optimal Hardness:

After rough processing, the screw barrel undergoes quenching and tempering to attain a hardness ranging between HB=260~290. This meticulous heat treatment contributes significantly to the mechanical properties of the extruder components.

Machining Excellence:

The machined extruder barrel must exhibit uniform wall thickness, meeting stringent standards. The inner hole's machining accuracy is paramount for optimal performance, and it should adhere to established benchmarks.

Nitriding for Enhanced Surface:

To enhance the surface properties, the inner hole undergoes a nitriding process. The nitrided layer's depth falls within the range of 0.40~0.70mm, with a surface hardness exceeding HV≥950. This surface treatment augments the wear resistance and longevity of the extruder barrel.

Finishing Touches:

Upon completion of the machining process, the roughness of the inner hole's surface should not surpass 1.6pm. This attention to finishing details is critical for ensuring smooth operation and product quality.

Forging Excellence for Screw Blanks:

The extruder screw blank is forged with precision, employing 38CrMoAl or 40Cr alloy steel. This forging process lays the foundation for the screw's structural integrity and performance.

Quenching and Tempering for Screw Hardness:

Similar to the barrel, the extruder screw undergoes quenching and tempering after rough processing, attaining a hardness of 260~290. This meticulous heat treatment enhances the mechanical properties, ensuring optimal functionality.

Precision in Outer Circle Accuracy:

The finished extruder screw must meet the h8 level accuracy requirements outlined in GB1801-79. This precision in outer circle accuracy is pivotal for seamless integration and reliable extrusion processes.