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Scraper Cutter
  • Scraper Cutter
  • Scraper Cutter
  • Scraper Cutter
  • Scraper Cutter

Scraper Cutter

Scraper Cutter (also known as a Drag Bit) is a primary cutting tool used in tunnel boring machines (TBMs) for excavating soft ground, cohesive soils, and mixed geological formations. Designed to scrape and shear through unconsolidated materials, it ensures efficient muck removal while maintaining tunnel stability. Widely deployed in urban metro systems, utility tunnels, and soft-rock mining, scraper cutters are essential for high-productivity tunneling in non-abrasive to moderately abrasive conditions.

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Key Features:
1. Durable Material Construction
– Cutting Tip: Made of tungsten carbide (WC-Co) or hardened alloy steel (HRC 55–60), often reinforced with wear-resistant overlays (e.g., Stellite 6) for extended service life.
– Body: Forged from high-toughness steel (e.g., 40CrMnMo), heat-treated to resist deformation under high shear forces.

2. Optimized Geometry
– Blade Profile: Curved or straight-edge designs to maximize material scooping and reduce clogging.
– Chipbreaker Grooves: Integrated grooves to fragment soil and prevent adhesion in sticky clay or silt.

3. Modular & Replaceable Design
– Quick-Change Inserts: Bolted or clamped carbide tips allow rapid replacement without dismantling the cutterhead.
– Adjustable Mounting: Slotted bases enable precise positioning to optimize cutting overlap.

Applications:
– Urban Tunneling: Excavating soft soil layers in metro systems and utility pipelines.
– Coastal Projects: Handling sandy or water-saturated ground in subsea tunnels.
– Mining: Cutting through coal seams or shale in low-to-medium hardness strata.
– Earth Pressure Balance (EPB) TBMs: Critical for maintaining face pressure in unstable soils.

Performance Advantages:
1. High Efficiency in Soft Ground
– Reduces torque demand by 20–30% compared to roller cutters in cohesive soils.
2. Superior Wear Resistance
– Tungsten carbide tips achieve 2–3× longer lifespan in sandy or gravelly conditions.
3. Clogging Prevention
– Anti-adhesion surface treatments (e.g., DLC coating) minimize material buildup.
4. Cost-Effective Maintenance
– Replaceable tips cut downtime by 50% versus full-cutter replacement.

Customization Options:
– Material Upgrades: Carbide-reinforced bodies for abrasive gravel layers.
– Special Coatings: Non-stick polymer coatings for high-clay environments.
– Hybrid Designs: Combined scraper-ripper teeth for mixed ground (soil with boulders).

Why Choose Our Scraper Cutters?
– Geology-Specific Designs: Tailored blade angles and tip configurations for optimal ground engagement.
– Global Logistics: Emergency replacement parts delivered within 48 hours.
– Sustainability: Recyclable tungsten carbide components reduce environmental impact.

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