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Diamond core drilling tools

Impregnated core bits

  • Delivery time: 5 to 30 days
  • Packing: Carton case
  • Diamond impregnated bit is manufactured with diamonds mixed evenly through a metal matrix, used for geological exploration, water conservancy, building construction etc drilling fields.

Product Description

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.

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