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है”ह”ह

IS 12635 (2000): Water Well Drilling and Blast HoleDrilling - Rock Roller Bit with Non-sealed Ball and RollerBearing Arrangement - Technical Supply Conditions [MED 21:Diamond Core and Waterwell Drilling]

IS 12635:2000

Indian &andard

WATER WELL DRILLING AND BLAST HOLEDRILLING — ROCK ROLLER BIT WITH NON-SEALED

BALL AND ROLLER BEARING ARRANGEMENT —TECHNICAL SUPPLY CONDITIONS

(First Revision )

lCS 25.080.40

0 BIS 2000”

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 11()()()2“{

.ffdy 2000” Price Group 4

\

Diamond Core and Water Well Drilling Sectional Committee, ME21

FOREWORD

This Indian Standard (First Revision) was adopted by the Bureau of Indian Standards, after the draft finalized

by the Diamond Core and Water Well Drilling Sectional Committee had been approved by the MechanicalEngineering Division Council.

Rock roller bit is a complex cutting tool used for the following applications:

Deep oil well drilling

Water well drilling

Blast hole drilling for mining

Short hole drilling for seismic surveys

This standard was first published in 1989. It was observed that this standard is specifically suitable for oil welldrilling since it was based on API standard. The bits required modifications in the sizes of rock roller bits, pinconnection, nozzle that these bits could be used for water well drilling and blast hole drilling bits.

In this revision, modifications have been incorporated, specially in sizes and pin connections ($ee Tables 1 and2) to cover sizes and connections required for drilling for water well and mining.

Functional and constructional details, both for steel milled tooth and tungsten carbide insert bits have beenincorporated in detail.

The technical details provided in the revised draft makes it a complete standard for water well drilling and blasthole drilling rock roller bits with non-sealed ball and roller bearing arrangements.

This standard will supersede IS 12194: 1987 ‘Dimensions for rock roller bits and blade drag bits for rockdrilling equipment’ as the information contained in IS 12194 is covered in this revised draft.

For the purpose of deciding whether a particular requirement of this standard is complied with, the final value,observed or calculated, expressing the result of a test or analysis, shall be rounded off in accordance withIS 2:1960 ‘Rules for rounding off numerical values (revised)’. The number of significant places retained in therounded off value should be the same as that of the specified value in this standard.

IS 12635:2000

Indian Standard

WATER WELL DRILLING AND BLAST HOLEDRILLING — ROCK ROLLER BIT WITH NON-SEALED

BALL AND ROLLER BEARING ARRANGEMENT —TECHNICAL SUPPLY CONDITIONS

( First Revision)

1 SCOPE

This standard covers the technical supply conditionsof tricone rock roller bits having milled steel teethdesign (see Fig. 1) and tungsten carbide insert design

(see Fig. 2) with non-sealed ball and roller bearing

REGULAR THREADCONNECTION

arrangement for water well drilling and blast holedrilling application. The technical supply conditionsstipulated under this standard are general in natureand shall be backed by design specifications of theindividual manufacturers depending on theapplicability of the product.

‘ANUFACT=JWLACTURERSSERIAL NUMBER

DESIGNATIONPLAN VIEW OF TOP OF THREAD FACE

SHOWING MARKING DETAILSTOP OF THREAD FACE

\

R THREAD

BALLRETAINING

ROLLER \ 1>

BALL SEARING

NOSE BUSH

THRUST BUTTON / CONE 2 \ L-CONE 3L. CONE 1

‘EEL

OUTER SURFACEOF CONE

FIG. 1 A TVPICALSTEELTOOTHROCKROLLERBIT

1

IS 12635:2000

REGULAR THREAO 1 BIT SIZE

‘0””-2!!!5s-v5JQ=+LRwERSERIAL NUMBER

PLAN VIEW OF TOP OF THREAD FACESHOWIN6 MARKING DETAILS

TOP OF THREAD FACE ,

BE

LEG—

BALLRETAINING PLUG

SHIRT TAIL

ROLLER \ \ \BEARING

BALL BEARING ~

i REGULAR THREAD

r<NOZZLE

. I

CARBIDE

BUTTONS FITTEO

+?j?;~\

ON OUTER.*;. &..7 ..,,:...,. : J..... ..>...... SURFACEOF CONE

‘osE=+n\ \——

THRUST BUTTON / CON~ -2 ~c0NE3

FIG. 2A TVPICALTUNGSTENCARBIDEINSERTROCKROLLERBIT

2REFERENCE 1S No. Title

The following standard contains provision which 9439:1980 Glossary of terms used in water well

through reference in this text, constitute provision of drilling technology

this standard. At the time ofpublication, the editionindicated was valid. All standards are subject to 3 TERMINOLOGYrevision and parties to agreements based on thisstandard are encouraged to investigate the possibility 3.1 For the purpose of this standard the terminology

of applying the most recent edition of the standard given in IS 9439 shall apply. In addition the

indicated below: terminology given in 3.2 to 3.11 shall also apply.

!

2

IS 12635:2000

3.2 Kock Keller mts

Rock roller bits basically consists of the followingmain components:

a) Leg,b) Cones,c) Ball elements,d) Roller elements,e) Sleeve,

--- ----- . . f) Thrust Bearing,g) Ball plug, andj) Nozzles.

3.2.1 The basic component of rock roller bit on whichbearing races are machined at one end and theconnecting threads are machined on the other end.The cones shall be mounted at the end where thebearing races are machined (see Fig. 3);

3.2.2 Each rock roller bit assembly shall consist ofthree cones which form the, rolling element of the bit.

These cones shall be marked as cone 1, 2 and 3depending on their status in the rock bit assembly.

3.3 Heat Treatment

Heat treatment method shall be so designed that thebearing races shall have sufficient hardness to act asan effective bearing system and have wear andabrasion resistance. The bottom end of the leg shallremain soft and tough to enable connecting threadmachining after assembly.

3.4 Cone

The cones shall be machined from forgings made ofalloy steel having the following properties:

a) High fatigue and impact strength,

b) Good wear and abrasion resistance, and

c) Should be of low carbon alloy steel to enabledeep carburizing.

3.4.1 Steel Milled Tooth Cones

The cones made of a steel body from a steel frogingwhere cutting structures are formed on the outer surfaceand the inner surface consists of the bearing elements(see Fig. 4).

3.4.2 Tungsten Carbide Insert Cones

These cones made of steel forgings with the innersurface consisting of bearing races and outer surfacehaving holes, drilled and reamed, and fitted with

FIG. 3 DETAILSOFLEG

3

FIG. 4 STEELMILLEDToom Com

IS 12635:2000

carbide buttons so as to form cutting structures a)(see Fig. 5).

3.5 Legb)

c)The leg shall be machined from forgings made of alloy d)steels having following properties:

I

Good spalling and abrasion resistance onhearing races,

High impact strength,

Steel shall be readily weldable, and

Should be of low carbon alloy steel which caneasily be carburizing.

I

\

I

FIG. 5 TUNGSTENCARBIDEINSERTCONE

3.6 Bearings

Balls and rollers used as bearings shall be producedfrom shock resistant tough hardening bearing steeland shall exhibit very high spalling wear and fatigue

and impact strength.

3.7 Sleeve

The sleeve is basically a bush bearing and shall bemade of heat resistant steel which shall have thefollowing properties:

a) Very high abrasion resistance,

b) retenion of hardness at high frictional

temperature, and

c) good core toughness.

3.7.1 Sleeves shall be provided on the cones to act asbearing media where additional bearings cannot beprovided such as bush bearing.

3.8 Thread Connection

The thread shall be generated in the shank and shallbe the final machining operation of the bit. The threadconnection for each size of bit shall be as specified inTable 2.

3.9 Pin Connection

The rock roller bits shall be supplied with the styleand sizes of pin connection given in Table 2.

3.10 Thrust Button

The thrust button shall be made of high speed steeland shall exhibit the following:

a)

b)

c)

3.10.1

Thrust

very high abrasion resistance,

retention of hardness at high frictionaltemperature, and

good core toughness.

Thrust Bush

bush shall be movided as mrt of the bearingstructure in the cone. tie bush sh;ll be made of highspeed steel and shall absorb the thrust load throughthe leg pin while the bit is in use (see Fig. 8).

3.11 Nozzles

The nozzles shall be made of either steel or carbide ora combination of both. The nozzles shall exhibit goodresistane to erosion and abrasive wear. Steel nozzlesshall be used unless otherwise specified for water welland blast-hole applications. The internal profile shallbe designed and machined to enable smooth outlet offlushing medium such as water or air.

4

4 FUNCTIONAL AND CONSTRUCTIONALDETAILS

The tricone rock roller bits are of intricate design andserve as a basic tool for drilling holes by rotary drillingmethod. The constructional details of the rock rollerbits shall be able to drill a wide spectrum of formationsfrom very soft formations to very hard and abrasiveformations. The cutting teeth on the cones shall be sodesigned and spaced that they shall be either chip orcrack the geological formations encountered whilethe bit is in rotary motion. The flushing system shallbe fool-proof enough in evacuating the crushingsformed at the hole bottom. The flushing medium incase of water well drilling shall be bentonite mud andfor blast hole drilling shall be compressed air.

5 SIZES OF ROCK ROLLER BITS

5.1 Rock roller bits shall be supplied in the sizesgiven in Table 1.

AIR PORT

PLUG WELD

-wBALL PLUG -

AIR HOLETO NOSE

IS 12635:2000

Table 1 Sizes of Rock Roller Bits

(Ckmse 5. 1)All dimensions in millimetres.

73.025 158.75 250.825 406.40

74,612 171,45 269.875 444.50

98.425 !93.675 298.45 457.20

114.30 200.025 311.15 508.00

123.825 203.20 349.255 558.805

142.875 215.90 355,60 609.60

149.225 219.075 374.655 660.405

152.40 244.475 381,00

5.2 Tolerances on bit diameter shall be as shown inTable 2.

5.3 A typical configuration of air blast jet type rockbit is given in Fig. 6.

CONE ‘ IBALLs

II

IHARD FACING

INNER BALL BUSHING

RACE FLANGE

FIG. 6 DETAILSOFAIR BLASTJET TYPE ROCKBITS

5

IS 12635:2000

Table 2 Tolerances on Bit Dia

(Clauses 3.8,3.9 and 5.2)

Size jn mm Tolerance in mm

From To’

73.025 74.612 + 0.50

-0.00

98.425 311.15 + 0.80

-0.00

349.25 444.50 + 1.60

-0.00

457.20 660.405 + 2.40

-0.00

5.4 Leg Cone Assembly

The individual rollers are assembled on the leg withthe help of balls and rollers. The grease of proper

quality shall be used for efficient functioning of thewearing system. The cones after fitment shall be

plugged with the help of retaining plug (see Fig. 8).

6 NOZZLE SIZES

6.1 The diameter of the nozzles shall be as specifiedby the purchaser or shall suit the design specification.The sizes of nozzles shall, however, depend on sizesof bits.

6.2 The nozzle sizes and numbers shall be as per thedesign criteria to suit the customer requirements.

6.3 In case of shallow drilling the provision of one

central nozzle can also be adopted depending oncustomer requirement (see Fig. 7).

7 WELDING

7.1 For welding three leg-cone sub-assemblies, theselection of weld material shall be such that the jointshall have a greater strength than the parent material.

7.1.1 The welding preparations on the legs shall be

done before the leg-cone sub-assembly.

7.1.2 The welded joints shall be free from surfacecracks. Non-destructive crack detection method shallbe used for the inspection of the joints.

8 METHOD OF GAUG~G THREADS

Threads of rock roller bits shall be gauged withworking gauges. The working gauges shall be

calibrated at suitable intervals with the help of mastergauges.

9 ROCK BIT ORDERING

It is necessary that the purchaser shall give fullparticulars of the rock bit while placing the order. Thefollowing specifications shall be given:

a) Size

b) Pin connection,

c) Size of nozzle and number of nozzles, and

d) Type of bit.

10 MARKING

The bit shall be marked on the top of the thread face

FIG. 7 DETAILOFNOZZLE

6

I

and shall contain legibly and permanently thefollowing details:

a) Bit sizes in mm,

h) Thread connection,

c) Manufacturer’s serial number, and

d) Manufacturer’s designation (see Fig. 1 and 2).

NOTE—Bits for drilling different strata may be used as

recommended by the manufacturer find agreed to by tbe

purchaser.

11 PAINTING

Bit shall be painted with a bright colour, such as,yellow, red, blue or green.

IS 12635:2000

12 PACKING

12.1 Bit shall be packed in boxes made of materialwhich is capable of protecting the bit, particularly thecutting structures of the bit, from damage during transitand storage. The thread connection shall also beprotected by re-usable rubber plastic cap to avoiddamage during transit and storage.

12.2 The box containing the bit shall have on itsoutside the following information:

a)

b)

c)

d)

e)

Bit sizes in mm,

Thread connection,

Manufacturer’s name and/or trade-mark,

Manufacturer’s serial number, and

Manufacturer’s designationlcode for the bit.

IS 12635:2000

BEARING BALL

( /

H,,:TH-A

FRICTION

BEARING J

\

LEG PIN

4)BALL HOLDER PLUG

LJFtG.8 DETAILSOFLEG ROLLERASSEmLY

8

‘\

Bureau of Indian Standards

BIS is a statutory institution established under the Bureau of Indian Standards Acr, 1986 to promoteharmonious development of the activities of standardization, marking and quality certification of goodsand attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications may be reproduced in any formwithout the prior permission in writing of BIS. This does not preclude the free use, in the course of

implementing the standard, of necessary details, such as symbols and sizes, type or grade designations.Enquiries relating to copyright be addressed to the Director (Publications), BIS.

Review of Indian Standards

Amendments are issued to standards as the need arises on the basis of comments. Standards are also reviewedperiodically; a standard along with amendments is reaf%med when such review indicates that no changes areneeded; if the review indicates that changes are needed, it is taken up for revision. Users of Indian Standardsshould ascertain that they are in possession of the latest amendments or edition by referring to the latest issue of‘BIS Catalogue’ and ‘Standards: Monthly Additions’.

This Indian Standard has been developed from Doc : No.’ MED 21 (0277)

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

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\

IPrinted at : Rabhat Offset Press, New Delhi-2

..‘,,