Produce Different Sizes Blast Hole Drill Bits For Soft To Very Hard Formations

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​In the mining industrial, blast hole drilling is very important to achieving the required product or outcome. Drilling suitable holes allowing explosive charges to be placed down the holes. And then to blast large areas making them more manageable and easier to remove.

What is Blast Hole Drill Bits?

Blast Hole Drill Bit is an ideal solution for soft, medium, or hard rock formations, it is connected with the drill stem and rotates along with it, and drive cones to pressed on the rock. Each cone rotates round the axis of its leg and three cones simultaneously revolve around the bit center. The tungsten carbide inserts on the cone shell cause the formation to spall under the weight on bit and the impact load of cone rotating, the debris will be discharged out to hole by compression air. Tricone bits come in several different varieties, and can deal with a wide range of different rock formations. It is important to know the type of formation you are drilling in when selecting a drill bit.

We took the following factors into consideration when designing:

1. Journal Angle - Journal angle determines the overall aggressiveness of the bottom hole profile. Soft formation rock bits employ a 33 degree angle while hard formation rock bits employ a 36 degree angle.
2. Cone Offset - Increased rate of penetration (ROP) can be achieved by offsetting the ceter line of the cone away from the center of bit rotation. This produces more on-bottom action. The higher the offset the greater the scraping and gouging action on bottom.
3. Cone Angle –Oversize angle controls the diameter of the cone at gage.

Soft to medium formation tricones employ a more round cone profile and a larger cone angle. This creates a bottom hole action of gouging and scraping.

Hard formation bits employ a smaller cone angle and a flatter cone profile. This creates a bottom hole action of crushing.

1. Oversize Angle - Oversize angle controls the diameter of the cone at gage.

Soft formation tricones employ a higher oversize angle; thus, escalating gage action and cone diameter.

Hard formation bits have very little or no oversize angle. This reduces the action on gage and also reaming of gage inserts.

1. Intermesh - Intermesh is the distance the top of a tooth or button bit insert extends into the grooves of adjacent cones. This spacing allows for cleaning of formation and prevents packing.
2. Projection and Pitch - Projection is the height of the button or tooth. Pitch is the space between teeth or inserts.

Bits thread are manufactured according to API standards.

Advantage:advantage of tci drill bit.pdf

1. Rotary drill bits are manufactured using aircraft quality steel and premium carbide grades developed to suit the toughest application.
2. Computerized designs using solid modeling, computerized manufacturing processes using the latest in CNC equipment and computer process controlled heat treatment ensure consistent, high quality, drill bits.
3. A tailor made cutting structure provides our customer with the best combination of bit life and rate of penetration to yield the lowest cost per meter.
4. The gauge will have Carbide Gauge Inserts to prevent early erosion of the steel. In very harsh or abrasive conditions additional protection is offered by applying Hard Facing alloy material to reinforce critical wear areas of the bit.

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