Welcome~Guizhou Vilong Equipment Co,.Ltd
Diamond impregnated core bit is manufactured with small, high quality synthetic diamonds mixed evenly through a metal matrix. The diamonds used are fine to micro fine industrial grade diamonds; they are set within a matrix of varying hardness, from brass to high-grade steel. The main technical parameters of impregnated diamond core bits include diamond type, size, concentration and diamond grade, matrix hardness and crown shapes etc. Matrix hardness, diamond size and dosing can be varied according to the rock which must be cut. If a driller can make rational selections according to the rock formations, then they can get satisfied drilling performance on various formations with different hardness.
Application: geological exploration, water conservancy, building construction etc drilling fields.
Impregnated core bits Matrix selection guide:
Rock Type
Abrasiveness
Rock Hardness
Matrix Hardness
Series. NO
Clay，Shale,Siltstone, Cypsum
Medium
Soft
HRC 50
GV1#
Ash Stone, Coal, Argilite,, Volcanics, Sandy Pebble
Very High
Soft
HRC 48-50
GV1/ GV2
Sandstone, Sandy Shale, Lithoid, Limestone, Limonite Sandstone
Very High
Medium Soft
HRC 45-48
GV1#/ GV2
Medium-hard, Limestone, Medium-hard Shale, Medium-hard Ash Stone
High
Medium
HRC 40-45
GV3/ GV4
Marble, Hard Schist, Hard Streak Stone
Medium
Medium
HRC 38-42
GV5/ GV6/ GV7
Diabase, Andesite, Gneiss
Medium
Medium Hard
HRC 38
GV6/ GV7
Grandiorite, ,Limonite
Medium
Medium Hard
HRC 35-38
GV7/ GV8
Cranite, Basalt, Hard Streak Stone
Medium To Low
Hard
HRC 32-35
GV8/ GV9
Rhyolite, Crystauize Gneiss, Quartz Porphyry
Medium To Low
Hard
HRC 25-30
GV9/ GV10
Silicious Stone, Hard Sandstone
Medium To Low
Extreme Hard
HRC 20-25
GV11/ GV12
Rhyolite, Dense Quartzite, Iron Stone
Low
Ultra Hard
HRC 10-20
GV12#
Bit Gauges:
SIZE
CORE
DIAMETER
HOLE
DIAMETER
(in)
(mm)
(in)
(mm)
BQ
1.433
36.4
2.345
59.6
NQ
1.875
47.6
2.965
75.3
HQ
2.500
63.5
3.763
95.6
PQ
3.345
85.0
4.805
122.0
NQ3, NQTT
1.775
45.1
2.965
75.3
HQ3, HQTT
2.406
61.1
3.763
95.6
PQ3, PQTT
3.270
83.1
4.805
122.0
How to select an impregnated bit? 1. Bits size; 2. Bit series. (Example: NQ GV7)
Diamond core drilling differs from other geological drilling, which utilizes an annular diamond drill bit attached to the end of hollow drill rods to cut a cylindrical core of solid rock for examination on the surface. The core does not drop out of the inside of the core barrel when lifted because either a split ring core lifter or basket retainer allow the core to move into, but not back out of the tube. Drilling of 1200 to 1800 metres is common and at these depths, ground is mainly hard rock, so diamond drill rigs need to drill slowly to lengthen the life of drill bits and rods, this drilling method cost are very expensive.
Drilling Steps:
1. To mount drill rods, bits, and core barrel etc drilling tools with a diamond drill rig.
2. To utilize a diamond drill bit attached to the end of drill rods to cut a cylindrical core of solid rock.
3. To retrieve the core samples to the surface by retracting the winch cable which located on the top end of the core barrel, lowered inside the rod string.
4. To remove the core sample from the core barrel, break it into small pieces to make it fit into the sample trays and catalogue.
Contact: Mr. Peter Chan
Phone: +86 851 8577 3056 / 8569
Email：sales@rotarypercussivedrill.com
Add：No.17, 21 floor, unit 1, 1 building, M district, xiaochehe street flower orchard project, Nanming district, Guiyang City, Guizhou Province, China.
