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Mining

Thread Connection Size
Operating Instructions
Drill Bit Size, Thread Connection and Recommended Make-up Torque
Drilling Parameter Selection Chart (Weight on Bit and Rotary Speed)
Pull Down and Rotation Speed Selection Chart

Product Overview

SHAREATE TOOLS LTD. mining tri-cone drill bit is mainly used in large open-pit mining operations, such as open-pit coal mine, copper mine, molybdenum mine, iron ore mine and other non-ferrous metal mine. Tri-cone drill bits are used on rotary drills, with a proven reputation of high performance and low cost. Shareate has a large scale drill bit R&D and manufacturing base using leading technologies in China. The company has adopted a flexible production system with the incorporation of CNC machining centres, being its core component. The production line consists of manufacturing equipment such as forging, heat-treatment, CNC machining centres, along with advanced inspection equipment. Our products are designed and manufactured to our certified API Q1 specification and ISO 9001 standards. The tri-cone drill bits range from 6 3/4" to 13 34”in size, and the production line is capable of customised design manufacturing for different size and series of drill bits to meet our customer' s requirements.

BASIC STRUCTURE OF TRI-CONE DRILL BIT

Tri-cone drill bits consists of a bearing structure, cutting structure,
shirttail and lug enhancement structures, flow channel system, and a
thread connections.
The bearing structure consists of lug bearing, cone bearing, seal ring
(sealed bearing), main rollers, minor rollers, locking bearing balls,
axle thrust plate, and recess thrust plate. It can be categorised into air
cooled open rlling bearing or sealed rolling bearing.

Product Characteristics

Cutting Structure

Specific insert type and materials are selected based on ground formation strength and friability to optimize matching of carbide wear resistance and toughness.
Computer simulated bottom hole impact curve design helps to arrange inserts effectively, and balance the working load of drill bit inserts.
Double bevel inserts: two rows of cross patterned bevel inserts are designed to strengthen the gaging performance.

Tri-cone Drill Bit Structural Feature Char

Bit Structural Characteristics	SG	SGA	SGV
Roller bearing	●	●	●
Open roller bearing	●
O-ring seal		●
Rubber flat seal			●

Bearing structure

By calculating the load distribution of each component in the bearing, the bearing geometric structure is designed to distribute bearing load evenly, which enhances the working bearing life.

Open bearing

Open bearing

Bearing structure: main roller – ball bearing - minor roller - thrust block, open bearing structure without seal ring

Sealed Bearing

Bearing structure: O-Ring Seal--main roller – ball bearing - minor roller - thrust block, sealed bearing

Composite Sealed Bearing

Bearing structure: Composite seal ring - main roller - ball bearing - minor roller - thrust block, sealed bearing

Lug Back Protection

Lug Back Protection

Lug back design promoting lift force increases bailing space, accelerates bailing velocity and reduces wear on drill bit from cutting regrinds.

Shareate Bit ldentification

SELECTION OF MINING TRICONE BIT

Name of Drill Bit Series

Shareate drill bit product model is divided into four sections: drill bit diameter code, drill bit series code, drill bit category code, and additional features code. Take 12 ¼ SG745GF as an example:

12¼ SGA 745 GF

The first part is categorised based on drill hole operation requirement for selecting the correct bit size, displayed in numbers (integer or fraction) to indicate the diameter in inches. Our current tri-cone product range includes 6 1/4, 6 3/4, 7 7/8, 8 1/2, 9, 9 7/8, 10 5/8, 11, 12 1/4, and 13 3/4 (inch).

The second part is based on drilling operating requirements for selecting the correct drill bit bearing and sealing structure, which is divided into the following series:

K, KG series: Air cooled open rolling bearing structure;
SA, SGA series: Sealed rolling bearing structure;
SGV series: Composite sealed rolling bearing structure.
TJ series: Water circulation cooled pilot hole drill bit series for use with raise boring rig.

The third part adapts the SPE/IADC codes, consisting of three digits, with the first digit of the IADC code referencing the cutting structure and formation series, the second digit further categorises the formation classification and the last digit is the drill bit structure characteristic code.

The first digit ranges from 4 to 8, which designates soft formation, medium-soft formation, medium-hard formation, hard formation and extremely hard formation.
The second digit classification ranges from 1 to 4, further categorise the formation. 1 being the softest formation, and 4 being the hardest formation.

The third digit classifies the structural characteristics of the drill bit which is divided into air-cooled bearings and sealed bearings, expressed by 2 and 5 respectively.

The fourth part affirms additional features. Shareate tri-cone drill bits can be manufactured with the following additional features:

forth features

SIX CHOICES

DRILL BIT SELECTION CHART (SELECTION BASED ON ROCK CHARACTERISTICS, COMPRESSIVE STRENGTH, FRIABILITY, ETC.)

Drill Bit Series	Rock Compressive Strength(Psi)	Rock Compressive Strength(MPa)
412/415	4000-7000	27-48
422/425	5000-8000	34-55
432/435	6000-9000	41-62
442/445	7000-10000	48—69
512/515	9000-15000	62-103
522/525	12000-19000	83-131
532/535	15000-23000	103-159
542/545	18000-27000	124-186
612/615	23000-30000	159-207
622/625	26000-34000	179-234
632/635	29000-38000	200-262
642/645	32000-42000	221-290
712/715	37000-44000	255-303
722/725	40000-48000	276-331
732/735	43000-52000	296-359
742/745	46000-56000	317-386
812/815	49000-58000	338-400
822/825	52000-62000	359—427

NOZZLE SELECTION CHART

Bit2

DRILL PIPE CONNECTION THREAD SELECTION CHART

Bit Diameter	mm	152	171	200	216	229	251	270	279	311	349
Bit Diameter	inch	6 1/4	6 3/4	7 7/8	8 1/2	9	9 7/8	10 5/8	11	12 1/4	13 3/4
API(REG)		3 1/2	3 1/2	4 1/2	4 1/2	4 1/2	6 5/8	6 5/8	6 5/8	6 5/8	6 5/8
BECO				4 1/2	4 1/2	4 1/2	6	6	6	6	6

Note: We can design and manufacture custom size and specification connection thread according to customer's requirements.

DRILL BIT SIZE, THREAD CONNECTION AND RECOMMENDED MAKE-UP TORQUE

Bit Size		API REG Thread	Make-up Torque
Inch	Millimetre	Inch	kN/m
6 1/4	158.8	3 1/2	9.5～12.2
6 3/4	171.5	3 1/2	9.5～12.2
7 7/8	200.0	4 1/2	16.3～21.7
8 1/2	215.9	4 1/2	16.3～21.7
9	228.6	4 1/2	16.3～21.7
9 7/8	250.8	6 5/8	38～43.4
10 5/8	269.9	6 5/8	38～43.4
11	279.4	6 5/8	38～43.4
12 1/4	311.2	6 5/8	38～43.4
13 3/4	349.3	6 5/8	38～43.4

DRILLING PARAMETER SELECTION CHART (WEIGHT ON BIT AND ROTARY SPEED)

IADC	Weight on Bit per Inch of Bit Diameter (lb/in)	Rotary Speed (r/min)	Cutting Structure	Applications
412 415	1000—2000	90—120	Conical on gage and inner rows	Designed for very soft formations with low compressive strength and high friability such as shale, soft limestone, sandstone, gravel clay, soft dolomite, coal.
432 435	1000—4000	90—120	Conical/Chisel on gage, Conical inner rows	Designed for very soft formations with low compressive strength and high friability such as shale, soft limestone, sandstone, gravel clay, soft dolomite, coal.
532 535	2000—5000	80—110	Conical/Chisel on gage, Conical inner rows	Designed for soft formations with low compressive strength, such as shale, soft limestone, interbedded dolomite, coal.
612 615	3000—5000	60—100	Conical/Spherical on gage, Conical inner rows	Designed for high compressive strength, medium hard and abrasive formations, such as limestone, sandstone, interbedded dolomite.
632 635	3000—6000	60—100	Conical/Spherical on gage, Conical inner rows	Designed for high compressive strength, medium hard and abrasive formations, such as limestone, sandstone, interbedded dolomite.
732 735	4000—7000	60—90	Spherical on gage, Conical/Double spherical on inner rows	Designed for high compressive strength, hard and abrasive formations, such as granite, limestone, sandstone, dolomite.
832 835	5000—8000	50—80	Spherical on gage, Double spherical on inner rows	Designed for high compressive strength, hard and abrasive formations, such as magnetite quartzite, quartzite, granite.

Note: Maximum weight on bit and rotation speeds should not be applied at the same time.

BIT FAILURE TYPES AND PRODUCT SELECTION

The common failure types for tri-cone bits are bearing failure, cutting structure failure, and cone body wear.

Failure types	Failure image	Recommendation	Image
Bearing failure		Recommend sealed bearing
Broken Insert (Cutting rows)		Select a bit suitable for harder formation
Broken Insert (Gage rows)		Choose the feature F for drilling in soft formation to reduce cone body wear
Broken Insert（Coring）		Choose the feature F for drilling in hard formation to reduce cone body wear
Shirttail and lug back wear		Choose the feature R for strengthened shirttail and lug back protection
Wear on the top of lug back		Choose the feature R with protection on the top of lug back