Rotary Blast Hole Drill Bits

Rotary drill bits for mining The BD Drill range of rotary drilling bits includes geometries and cemented carbide grades for different surface and compressive strengths, abrasiveness, massiveness and homogeneity of rock as well as for various penetration rates and capabilities and characteristics...

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Rotary drill bits for mining

The BD Drill range of rotary drilling bits includes geometries and cemented carbide grades for different surface and compressive strengths, abrasiveness, massiveness and homogeneity of rock as well as for various penetration rates and capabilities and characteristics of the drill rig. Innovative bearing technology and improved geometry, materials and machining methods provide longer bearing life.

 

The selection of BD Drill rotary drill bits covers both blast hole bits for mining applications and bits suitable for construction and civil engineering applications. The product covers hole diameters from 159 to 406 millimeters (6 ¼ to 16 inches). Both air-cooled and sealed bearings are available, as well as various carbide grades and insert geometries with cutting structures optimized for all conditions.


Advantages

1. Insert shapes and grades designed to provide long life and high productivity

2. Longer service life for decreased machine downtime

3. Air-cooled bearing performance optimized for high hours by advanced metallurgy, proportioning of components, and optimized geometries

 

Specification: IADC CODE 435

Size: 9 inch – 229mm

 

Applications:

Application for drilling soft formations with low compressive strength and high drillability, such as shale, soft limestone, sandstone, conglometare, soft dolomite and coal bed, etc(Protodikonov's Hardness Coefficient of Rock f=7)

 

Bearing structure: Roller-Ball-Second Thrust-Roller-First Thrust/Sealing, abrasion-resistance carbide button insert on the bearing surface.

Circulation Type: Jet Air

Cutting Structure:

-Inner Rows: Conical

-Gage Rows: Chisel

-Gage Bevel Protection: Round

Pin connection: 4 1/2” REG(API)

Nozzel: Φ19.5mm(THREE pcs)  Interchangeable

Metric Bit Diameter: 229mm

Product Weight: 50 KG


Bit Legs Protection

Carbide alloy button insert on the legs’ surface, back and top space of legs build up welding of abrasion-resistant alloy.

 

Operating Suggestions:

Weight on Bit: 9000-36000 Lbs

Rotary Speed: 120-90 RPM

Air Back Pressure: 0.2-0.4 Mpa

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