Diamond impregnated bits, impregnated core bits, diamond drill bits

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• Product description：Diamond impregnated bit is manufactured with diamonds mixed evenly through a metal matrix, used for geological exploration, water conservancy, building construction etc drilling fields.
• 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)

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  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.