Diamond Drill Bit And Tool , Coal Mine PDC Drill Bit For Sandstone
PDC Drill Bit For Sandstone Drilling
1. New Superhard Material;
2. High Drilling Rate;
3. Wearable Blade;
4. Used For Coal Mine
1. Cutting toos adopts superhard material, long service life drill
2. Can be greatly improved the in hard and medium-hard drilling
3. Wearable blade, without grinding, convenient to use;
4. Reduce the labor intensity,it is suitable for lithologic strata
at level 4-12
This type of bit uses seismic grade tungsten-carbide as the cutting
media. Tungsten-carbide does not possess the hardness of diamond
and as such has a limited range of application as a core drilling
cutting media. Tungsten-carbide bits are however a very cost
effective means of drilling softer unconsolidated formations.
There two types:the “carbide-chip” and the “saw-tooth” types.
T.C Core Bits“carbide-chip”type
These bits are set with rectangular-shaped or octagonal-shaped
tungsten-carbide elements that are physically embedded into the
crown of the bit. The bit crown itself is composed of a tough, wear
resistant metal-bond matrix material.
The application of this bit is primarily in geotechnical soil
investigation or for core drilling in overburden layers that are
mainly composed of clay, sand, gypsum or soft shale.
Broken Carbide Core Bits “saw-tooth” type
The cutting media used in this type of core bit are crushed
tungsten-carbide that are bonded in a metallic alloy. This type of
core bit has more cutting edges than the regular T.C bit and as
such have a wider range of application in some formations.
This bit is similar to impregnated diamond core bits in that the
bit crown is composed of several layers of cutting media. The bit
face regenerates itself with new cutting edges by wearing away the
metallic alloy during operation to continually expose new layers of
carbide-chips until the bit crown is consumed.