How to choose diamond drill bit according to the rock properties

For the hard rock drilling and dense low efficiency problem, this paper

analyzes the tungsten carbide-based hot drill diamond protrusion such as

lithology and rock abrasiveness intrinsic link between that drill

carcass composition and its performance is tamping rammer  critical , hard and brittle

with a carcass beneficial properties of the diamond blade, which can

increase the drilling speed. Therefore, from diamond drill hot carcass

composition and properties of the start, after repeated experimental

research, trial out of the hot steel bonded carbide type impregnated

diamond bit. In the hard and dense rock drilling field tests showed

that: with ordinary tungsten-based drill compared to drilling aging by

the 0. 5 m / h up to 1. 18 m / h, drill working life by a 10 m / a

increased to 21. 31 m / a, basically solved the hard and dense rock

drilling difficult problem. Experimental results show that the type of

steel bonded carbide matrix is  wet diamond polishing pads ​​an excellent diamond drill carcass

material, the type of hot carcass diamond drill is a kind of a broad

spectrum of diamond drill bits. Foreword traditional hot tungsten

carbide-based diamond drill is widely used in geological prospecting.

Tungsten carbide-based diamond bit high abrasion resistance, better

adaptability for rock. However, this type of drill bit for hard - hard

and dense rock formations exhibit adaptability unsatisfactory drilling

less effective, while 08 1994-2010 China Academic Journal Electronic

Publishing House. All rights reserved. Http:/ / www.cnki.net Diamond &

Abrasives Engineering Total No. 168 effective only 0. 40 m / h ~ 0. 50 m

/ h, working life of only 8 m ~ 10 m. Meanwhile, in recent years,

tungsten carbide, cobalt, nickel and other metal materials prices, the

cost of diamond drill increased significantly. In order to improve drill

hard and dense rock drill drilling performance and reduce costs, we have

gone through nearly two years of experimental research, successfully

developed a type of hot carcass steel bonded carbide impregnated diamond

drill bit. Steel bonded carbide type of steel bonded carbide matrix is ​​

designed based on the idea, its composition and  cutting discs the ratio of the larger

changes were made, including tungsten carbide, cobalt and other

materials was significantly lower, at a reasonable thermal pressure

condition of the carcass is formed. A carcass Test 1.1 steel bonded

carbide type carcass performance design for hard and dense rock

formations, to improve the diamond bit drilling results, we must have

two basic conditions: ① with the wear resistance of the carcass

abrasive rock drilling performance to adapt bit matrix slightly ahead in

the process of drilling diamond wear, so that the carcass of a diamond

blade can be timely to ensure effective cutting rocks. ② requirements

of the diamond matrix alloys have a solid package insert effect, there

is a higher blade without shedding [2], the carcass of the diamond can

be a long time to maintain a sharp cutting results. To achieve these

goals, we must study the type of steel bonded carbide matrix can improve

the wetting adding diamond alloy composition.