Raise Boring Drilling Tool

Raise Boring Drilling Tool Raise Boring Drilling Tool And TBM Cutter Factory WhatsApp+8618961670797

23/07/2026

Raise Boring Drill Pipe

Raise Boring Machine Center Rod – The Core Power Transmission LinkThe center rod is a critical component in the raise bo...
03/07/2026

Raise Boring Machine Center Rod – The Core Power Transmission Link

The center rod is a critical component in the raise boring machine (RBM) drilling system, positioned at the lowest end of the drill string, directly connecting the drill bit to the drill pipe. It fulfills three core missions:

🔹 Power Transmission – Efficiently transfers torque and axial thrust from the drilling rig to the drill bit, driving rock-breaking operations.

🔹 Precision Guidance – Ensures the drill bit follows the predetermined path, guaranteeing borehole accuracy and verticality.

🔹 Media Conveyance – Features a built-in central passage that provides a circulation path for flushing fluid to cool the drill bit and effectively carry cuttings to the surface.

Manufactured from high-strength alloy steel, the center rod delivers an optimal balance of hardness and toughness to withstand complex downhole stress conditions. Certain advanced designs incorporate elongated structures with reinforced stabilizer bars, significantly enhancing torsional strength and minimizing the risk of fracture.

29/06/2026

When it comes to raise boring, the thread connection is the backbone of every drill string.

DI-22 — the internationally recognized standard for raise boring drill rods. Designed with a large helix angle and coarse thread profile, it delivers superior load capacity and exceptional resistance to thread root fatigue.

Because in underground construction, reliability isn't optional — it's everything.

4 Steps to Select the Right Raise Boring Reamer Head – Avoid Costly MistakesSelecting the wrong reamer head can lead to ...
27/06/2026

4 Steps to Select the Right Raise Boring Reamer Head – Avoid Costly Mistakes

Selecting the wrong reamer head can lead to equipment failure, project delays, or even safety incidents. Getting it right from the start is critical.

Here’s a quick 4-step framework I use for reamer head selection:

1. Know Your Rig & Project Basics

Final reaming diameter and depth

Rig's max reaming diameter, torque, and pullback capacity

Drill rod thread type and size (must match the reamer head)

2. Assess Rock Conditions
Rock properties – especially Uniaxial Compressive Strength (UCS) – determine cutter selection and head design. Some heads are rated for UCS up to 1400 MPa. For challenging formations, custom cutter configurations are available.

3. Match Key Head Specifications

Diameter & Weight: Head diameter should equal or slightly exceed target bore size. Weight matters – a 3m head can weigh ~15 tons, and a 5m head over 30 tons. Ensure your rig's pullback capacity covers head + drill string weight.

Cutter Quantity & Type: More cutters for larger diameters. Choose cutter models that match your ground conditions.

Pilot Hole Size: Must align with the head design for smooth lowering and start-up.

4. Consider Structure & Special Solutions

One-piece vs. Modular: Modular heads (with detachable wings) are easier to transport and assemble in confined underground spaces.

Two-stage Reaming: If your rig has limited capacity but you need a large final diameter, multi-stage reaming can get the job done.

22/06/2026

Great time for raise boring cutter procurement? Tungsten carbide prices have dropped significantly.

If you’ve been watching the tungsten carbide market, you know how crazy things have been. Prices surged earlier this year due to supply constraints and export controls from China, which produces over 80% of global tungsten. But now? Carbide powder prices have fallen over 50% from their March peak, currently hovering around RMB 950–1,100/kg.

This shift is creating a real cost advantage window for raise boring cutter buyers. With raw material costs easing, we're seeing a surge in inquiries from mining and tunneling projects globally.

Why Does Your Raise Boring Stem Keep Breaking? 3 Root CausesIf you're in raise boring, you know the nightmare: a snapped...
17/06/2026

Why Does Your Raise Boring Stem Keep Breaking? 3 Root Causes

If you're in raise boring, you know the nightmare: a snapped stem mid-operation. Costly downtime, lost equipment, and safety risks. Here are the three main reasons your stem keeps failing—and what you can do about it.

1. Fatigue from Cyclic Stresses (The Silent Killer)

The stem endures millions of load reversals during reaming. Over time, micro-cracks form at stress points and propagate until failure. Field tests confirm that alternating stress is a primary cause of drill rod breakage. This isn't a sudden overload—it's metal fatigue that creeps up on you.

2. Overload and Bending at Startup

When the reamer head hits uneven rock at the start of reaming, differential bending moments are applied directly to the stem and saver sub. Repeated excessive bending forces create fatigue cracks that eventually lead to catastrophic failure. Uneven cutter contact = uneven stress.

3. Stress Concentration at Thread Connections

The threaded connection between the stem and the drill string is the weakest link. In practice, fractures frequently occur at the threaded joint just above the reamer head—precisely where torque and bending stress concentrate. This is compounded by insufficient make-up torque or misalignment during connection.

5M reamer. Raise boring machine. Hard rock doesn't stand a chance. Precision. Power. Performance.
13/06/2026

5M reamer. Raise boring machine. Hard rock doesn't stand a chance. Precision. Power. Performance.

Common Process & Operational Issues with Raise Boring Machines (RBM) – And How to Mitigate ThemWhen it comes to raise bo...
08/06/2026

Common Process & Operational Issues with Raise Boring Machines (RBM) – And How to Mitigate Them

When it comes to raise boring operations, process-related problems are often the most damaging and can lead to project failure. Here are six critical issues to watch for – plus key prevention tips.

1. Pilot Hole Deviation
One of the toughest challenges. Uneven ground and drill string deformation are the main causes.
✅ Prevention: Ensure the rig is perfectly level and stable from the start. Use a gyro inclinometer for real-time monitoring and active correction. Current tech can keep vertical deviation within 0.8%.

2. Stuck Drilling / Reaming
Common during pilot or reaming stages, often due to hole collapse or falling rock blocks.
✅ Response: Try “down-pressure + forward rotation”. Reduce thrust when entering fractured zones. Only experienced personnel should handle stuck drills.

3. Hole Collapse & Wall Instability
Happens in fault zones, broken formations, or when flushing pressure is improperly set.
✅ Prevention: Use high-quality mud for wall support. Lower bit pressure when drilling through broken ground.

4. Drill Pipe / Tool Breakage
Caused by long-term cyclic stress, severe wear, or bending.
✅ Prevention: Rigorously inspect all pipes. Immediately remove any with excessive wear or signs of bending.

5. Severe Reamer Head & Disc Cutter Damage
High-speed drilling in extremely hard rock or improper parameters (thrust, RPM) leads to abnormal wear or tooth breakage.
✅ Prevention: Adjust drilling parameters based on rock conditions. Avoid aggressive over-speeding.

6. Shaft Wall Stability Risks
In deep high-stress zones or soft rock, wall peeling, squeezing, or deformation can damage the entire shaft structure.
✅ Prevention: Conduct thorough geotechnical analysis beforehand. Adjust support measures and advance rate accordingly.

🎯 Proactive monitoring, proper parameter control, and regular equipment inspection are the keys to avoiding these costly failures.

Reamer Head Selection – Get It Right.Choosing the right reamer head means balancing:Rock type & abrasivenessRequired bor...
06/06/2026

Reamer Head Selection – Get It Right.

Choosing the right reamer head means balancing:

Rock type & abrasiveness

Required bore tolerance

Torque and thrust limits

Gauge protection strategy

Rigid body + correct insert geometry + effective flushing = longer life and straighter holes.

Don't over-design or under-spec. Match the tool to the ground condition.

Technical choices drive performance underground.

Customer-customized Raise boring
05/06/2026

Customer-customized Raise boring

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No. 68 Wanquan Road, Zhouzhuang Town, Jiangyin City
Jiangyin
214400

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