Twin Screw

Twin screws are usually combined using several parts of different structures for a specific purpose. This particular type is often called a segmented screw. Omega provides custom made segmented screws and shafts in a specific size, even when that size is more than 10 meters. A few examples are shown below.

  • Conveying element
  • Conveying element
  • Mixing element
  • Mixing element
  • Mixer element

Omega applies alloy coating strategies to protect the surface of the twin screw from corrosion and abrasion caused by additives in engineering material and thermoplastic material. In doing so, the screw becomes much more durable. This screw type is known as a bimetallic twin screw.

Three different types of bimetallic screws with different protection strategies are shown below.
All working face covered by alloy layers
Flight covered by alloy layers
The screw body with a driving function is made using a high toughness steel, and the flight is made using an powder metallurgy steel
Recommended materials for twin screw

WR5
W6M5Cr4V2(M2)
C12MoV(D2)

Major Chemical and Hardness Comparison Table of Recommended Material for Segment Screw & Kneading Disk
Name Material Type Fe C Cr Si Mn Mo Ni V W Hardness
WR 5 Powder Tool Steel Bal 2.4～2.7 5.0～7.0 0.5～1.0 ≤0.5 1.3～1.6 -- 9.0～10.0 -- HRC 60 ～ 64
W6M5Cr4V2(M2) High Speed Steel Bal 0.80 ～ 0.90 3.8 ～ 4.4 0.20 ～ 0.45 0.15 ～ 0.40 4.5 ～ 5.5 ≤0.30 1.75 ～ 2.20 5.50 ～ 6.75 HRC 60 ～ 64
C12MoV(D2) Die Steel Bal 1.45 ～ 1.70 11.0 ～ 12.5 ≤0.40 ≤0.40 0.4～0.6 ≤0.25 0.15 ～ 0.30 -- HRC 58 ～ 60
Recommended materials for shaft

WR 30
45CrNiMoVA
40CrNiMoA(4340)

Major Chemical and Hardness Comparison Table of Recommended Material for Screw Shaft
Name Material Type Fe C Cr Si Mn Mo Ni Other Stand Torque Level
WR 30 High Nitrogen Steel Bal 0.25 ～ 0.30 14.0 ～ 16.0 0.9 ～ 1.10 0.9 ～ 1.1 0.85 ～ 1.10 0.40 ～ 0.60 N 0.3 ～ 0.5 11 Grade，L/D ≥48
45CrNiMoVA High Torque Steel Bal 0.42 ～ 0.49 0.80 ～ 1.10 0.17 ～ 0.37 0.5 ～ 0.8 0.20 ～ 0.30 1.30 ～ 1.80 V 0.1 ～ 0.2 9 Grade，L/D 48
40CrNiMoA(4340) Torque Steel Bal 0.37 ～ 0.44 0.60 ～ 0.90 0.17 ～ 0.37 0.5 ～ 0.8 0.15 ～ 0.25 1.25 ～ 1.65 -- 8 Grade，L/D 36 ～ 48
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  • Strong designing strength
    We design and manufacture the screws, barrels, and extruders according to customer requirements.
  • Rich experience
    We have been in the extrusion industry for decades, and our products are used by prominent companies such as Foxconn.
  • Advanced material technologies
    Our PM-HIP processing technology increases the material density and reduces casting defects. The new design of an aluminum alloy clad layer on SiC ceramic allows the extruder to work, even in harsh conditions.
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