INDUSTRY COMPONENT

Main Screw (Worm Shaft)

The main screw (worm shaft) is the central rotating component in continuous screw presses that applies mechanical pressure to extract oil from seeds or nuts.

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Component Specifications

Definition
The main screw, also known as the worm shaft, is a precision-engineered helical shaft that rotates within the barrel of a continuous screw press. It progressively compresses oil-bearing materials through decreasing pitch and increasing root diameter, generating the mechanical pressure required for oil extraction. This component converts rotational torque into axial compression force while maintaining material flow consistency.
Working Principle
The worm shaft operates on the Archimedes screw principle combined with progressive compression mechanics. As it rotates, the helical flights convey material forward while the decreasing pitch and increasing shaft diameter create a compression ratio that squeezes oil from the feedstock. The continuous taper design ensures gradual pressure increase without sudden shear forces that could degrade oil quality.
Materials
Typically manufactured from case-hardened alloy steel (e.g., 4140, 4340) with surface hardness of 58-62 HRC. High-wear areas may feature tungsten carbide coatings or nitrided surfaces. Food-grade applications use stainless steel (316L) with polished surfaces.
Technical Parameters
  • Taper Angle 1.5-3.5 degrees
  • Diameter Range 100-500 mm
  • Surface Finish Ra 0.4-0.8 μm
  • Rotational Speed 20-60 RPM
  • Compression Ratio 1:4 to 1:8
  • Pressure Capacity 50-200 MPa
  • Length-to-Diameter Ratio 8:1 to 15:1
Standards
ISO 12100, DIN 8589, ISO 22000

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Main Screw (Worm Shaft).

worm shaft main screw oil press screw continuous screw press extraction screw helical shaft compression screw oil extraction component Main Screw (Worm Shaft) Main Screw (Worm Shaft) in Machinery and Equipment Manufacturing

Parent Products

This component is used in the following industrial products

Continuous Screw Press for Oil Extraction

Industrial machine for continuous mechanical extraction of oils from oilseeds and nuts.

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Engineering Analysis

Risks & Mitigation
  • Wear and abrasion from feedstock
  • Fatigue failure from cyclic loading
  • Corrosion in humid environments
  • Improper alignment causing vibration
  • Overheating from excessive friction
FMEA Triads
Trigger: Abrasive feedstock materials
Failure: Progressive wear of helical flights
Mitigation: Use hardened materials, apply wear-resistant coatings, implement material pre-treatment
Trigger: Improper lubrication
Failure: Overheating and seizure
Mitigation: Establish automated lubrication system, monitor temperature sensors, use food-grade lubricants
Trigger: Misalignment during installation
Failure: Vibration and premature bearing failure
Mitigation: Use laser alignment tools, implement regular alignment checks, install vibration monitoring

Industrial Ecosystem

Compatible With

Interchangeable Parts

Compliance & Inspection

Tolerance
±0.05 mm diameter tolerance, ±0.1° helix angle tolerance, Ra 0.4-0.8 μm surface finish
Test Method
Dimensional verification with CMM, hardness testing per ISO 6508, NDT inspection for cracks, performance testing with standard feedstock

Procurement Evaluation Criteria

Not customer reviews or live demand data. These dimensions support RFQ preparation and supplier evaluation.

Technical documentation
4/5
Manufacturing capability
4/5
Inspection readiness
5/5
Supplier transparency
3/5

These scores are example evaluation dimensions, not real customer ratings, country-specific buyer feedback, or live inquiry activity.

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Frequently Asked Questions

What is the difference between a main screw and worm shaft?

Both terms refer to the same component. 'Main screw' emphasizes its primary function in the press system, while 'worm shaft' describes its helical geometry resembling a worm gear thread.

How often should the main screw be replaced?

With proper maintenance, main screws typically last 5-10 years. Replacement frequency depends on material abrasiveness, operating hours, and maintenance practices. Regular inspection for wear and surface degradation is recommended every 6-12 months.

Can main screws be repaired or refurbished?

Yes, worn screws can often be rebuilt through hardfacing, re-machining, or re-coating processes. However, severe wear affecting the compression profile usually requires complete replacement to maintain extraction efficiency.

Can I contact factories directly?

Yes, each factory profile provides direct contact information.

Data Basis

CNFX manufacturer profiles, technical classification, publicly available product information, and ongoing plausibility checks.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

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