is 11145 (2002): plain bearings -- thin walled half ... · of iso 3548 and iso 6864 in order to...

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IS 11145 (2002): Plain Bearings -- Thin WalledHalf-Bearings -- Checking of Peripheral Length [PGD 13:Bearing]

lS 11145:2002

ISO 6524:1992

Indian Standard

PLAIN BEARINGS — THIN-WALLED HALF- rBEARINGS — CHECKING OF PERIPHERAL LENGTH ; ~

f;; j

( First Revision)

Ics 21.100.10

!---

(1 BIS 2002

BUREAU OF INDIAN STANDARDSMANAK BHAVAN, 9 BAHADUR SHAH ZAFAR MARG

NEW DELHI 110002

June 2002 Price Group 11

L.—

Plain Bearings Sectional Committee, BP 31

NATIONAL FOREWORD

This Indian Standard ( first revision ) which is identical with ISO 6524:1992 ‘Plain bearings — Thin-walled half-bearings — Checking of peripheral length’ issued by the International Organization forStandardization ( ISO ) was adopted by the Bureau of Indian Standards on the recommendations ofthe Plain Bearings Sectional Committee and approval of the Basic and Production Engineering DivisionCouncil.

This standard was originally published in 1984. This revision of the standard has been made by adoptionof ISO 6524: 1992 under dual numbering system.

The text of the ISO Standard has been approved as suitable for publication as Indian Standard withoutdeviations. Certain conventions are, however, not identical to those used in Indian Standards. Attentionis particularly drawn to the following:

a) Wherever the words ‘International Standard’ appear referring to this standard, they should beread as ‘Indian Standard’.

b) Comma ( , )’ has been used as a decimal marker in the International Standard while in IndianStandards, the current practice is to use a point ( . ) as the decimal marker.

In the adopted standard, reference appears to certain International Standards for which Indian Standardsalso exist. The corresponding Indian Standards which are to be substituted in their place are listedbelow along with their degree of equivalence for the editions indicated:

International Standard

ISO 3548: 19781) Plain bearings —Thin-walled half bearings —Dimensions, tolerances and methodsof checking

ISO 6864: 1984 Plain bearings —Thin-walled flanged half bearings —Dimensions, tolerances and methodsof checking

Corresponding Indian Standard

IS 4774 ( Part 1 ) :1988 Thin-walledhalf bearing : Part 1 Plain bearing( first revision)

IS 4774 ( Part 2 ) :1998 Thin-walledhalf bearing : Part 2 Flangedbearings ( first revision )

Degree of Equivalence

TechnicallyEquivalent

do

-,

1’l’”

fi~so 3548 has been revised and 1999 version incorporates the requirement Of ISO 6864 dSO.

IS 11145:2002 ‘

ISO 6524:1992 &j—

Indian Standard

PLAIN BEARINGS — THIN-WALLED HALF-BEARINGS — CHECKING OF PERIPHERAL LENGTH

( First Revision)

1 Scope

This International Standard specifies methods ofchecking the measuring equipment and gaugingtools necessary for measuring the peripheral length(or nip or crush) of thin-walled half-bearings.

Thin-walled half-bearings are flexible and, in thefree condition, do not conform to a cylindrical profile.This is one reason why the peripheral length of thehalf-bearings can only be measured under a con-straining load by use of specialized measuringequipment.

Measuring equipment different from that illustratedin this International Standard can be used, providingthe measuring accuracy of the equipment is con-sistent with the specifications given in clause 17.

This International Standard does not include meas-urement of the joint face taper.

It applies to thin-walled half-bearings, the specifica-tions of which are given in ISO 3548 and ISO 6864.

2 Normative references

The following standards contain provisions which,

I through reference in this text, constitute provisionsof this International Standard. At the time of publi-cation, the editions indicated were valid. All stan-dards are subject to revision, and patties toagreements based on this International Standardare encouraged to investigate the possibility of ap-plying the most recent editions of the standards in-dicated below. Members of IEC and ISO maintainregisters of currently valid International Standards.

ISO 3548:1978, P/sin bearings – Thin-wa//ed ha/fbearings – Dimensions, tolerances and methods ofchecking.

ISO 68t34:l 984, P/air? bearings – Thin-wal/ed t7angedhalf bearings – Dimensions, tolerances and methodsof checking.

3 Definitions

For the purposes of this International Standard, thefollowing definitions apply.

3.1 peripheral length: The circumferential lengthwhich runs from one joint face to the other.

3.2 nip; crush: The value, a, by which a half-bearingfitted in a checking block of bore diameter C& undera predetermined checking load F exceeds the de-fined peripheral length of the checking block bore(see figure 1).

NOTE 1 In practice, the datum serves as a basis formeasuring f2 (see figure 2).

F

Figure 1 – Nip, a

3,3 repeatability: The closeness of agreement be-tween successive results obtained with the samemethod on the same test piece, under the sameconditions (same operator, same measuring equip-ment, same checking place and time intervals).

NOTE 2 Repeatability is assessed fromdeviation of repeatability OA.See annex E.

the standard

1

IS 11145:2002

ISO 6524:1992

3.4 reproducibility: The closeness of agreementbetween individual results obtained with the samemethod on the same test piece but under differentconditions (identical or different operator, measur-ing equipment, checking place and times).

NOTE 3 For the purposes of this International Standard,reproducibility is the difference between the two averagesobtained from two sets of measuring equipment. See an-nex E.

3.5 comparability: The accuracy in the case of op-erators working in different checking places at dif-ferent periods and each of them achieving individualresults, one using method A and the other methodB, on the same half-bearing in different checkingblocks.

NOTE4 Comparability is assessed from the differencebetween the two averages obtained from the two meth-ods. See annex E.

4 Symbols

NOTE 5 The characteristic subscripts are as follows:

bs: bearing to be checked

cb: checking block

cbm: master checking block

cbs: series checking block

CS: comparison shell

M: measured

ms: master shell

th: theoretical

a or a, + U2 nip, in millimetres

B width of the half-bearing withoutflange, in millimetres

B, checking block width (construction forflanged half-bearings), in millimetres

B2 checking block width, in millimetres

B3 checking block width (construction forhalf-bearings without flange), in milli-metres

Bms master shell width, in millimetres

dcb diameter of the checking block bore, inmillimetres’)

1)~. outside diameter of the half-bearing tobe checked, in millimetres

I]m, outside diameter of the master shell,in millimetresf)

E Young’s modulus, in newtons persquare metre

.f coefficient of friction in calculation ofdeflection under load

J’= ~1 = F2 checking load, in newtons

Fc.r

/1

I]cb

A1lC~

K,

Kz

1

Al

?%

Ra

‘~cs

.rms

$tot

u

w

z

correction factor, in millimetresl)

fillet radius between back and flangeon flanged half-bearing, in millimetres

distance from the bottom of the check-ing block bore to the datum plane, inmillimetresll

elastic deformation of the height of thechecking block under load, in milli-metres

checking block chamfer (constructionfor half-bearings without flange), inmillimetres

checking block chamfer (constructionfor flanged haif-bearings), in milli-metres “

h, -) :’periR&md length, in millimetresl)c,

,.-,:: :devj@\ion of the actual peripherallength of the checking block, in milli-metres

elastic depression of the toe piece, inmillimetres

surface roughness, in microns

wall thickness of the comparison shell,in millimetres

wall thickness of the master shell, inmillimetres

total wall thickness of the half-bearing,in millimetres

uncertainty of measurement

width of the toe piece contact area, inmillimetres

distance between ffanaes of theflanged half-bearing, in m~llimetres

1) The symbol may be followed by a subscript defining the gauging tool to which the symbol is applied and/or by a sub-script indicating an effective measured value or a theoretical value.

2

IS 11145:2002ISO 6524:1992

_

A empirical correction to compensate forthe difference in elastic deflections un-der load between method A andmethod B, in millimetres

i correction estimated by calculation

c standard deviation

5 Purpose of checking

It is necessary to keep to within the nip tolerancesof ISO 3548 and ISO 6864 in order to guarantee thedesignated mounting compression (interference fit)for the half-bearings in the housing bore.

6 Checking methods

6.1 Method A

The checking load, J’, is directly applied via themeasuring head with a pivoting toe piece to one

Gjoint face of the half-bearing whilst the other joint ,{face is in contact with a fixed stop (see figure 2).

6.2 Method B

The checking loads F, and F2 are applied via themeasuring head and two toe pieces to both jointfaces of the half-bearing (see figure 3).

NOTE6 In the case of method A, the fixed stop exertsthe required counter-force which, in the case of methodB, is applied directly by the measuring equipment via twotoe pieces.

EXAMPLE

Method A F=6000N

f– Dialgauge

F

Movablenwasurlnghead

- Plvotlngtoe piece

@A= kllp)AI

--

Figure 2 – Principle of method A

3

IS 11145:2002

ISO 6524:1992

A.

Dial gauge

%/ FI d

Dialgauge

F2*

I

IaB = dgl ‘aB2= (dp)B

*) Bearings mayalso rechecked uslngtwo plvotlngtoepleces.

Figure 3 – Principle ofmethod B

7 Choice anddesignation of checkingmethod

7.1 Choice of checking method

Recommendations for choosing either method A ormethod B, based on the dimensions of the half-bearings to be checked, are given in table 1.

However, any size of bearing may be testedby either method by agreement between the manu-facturer and user. In that case, a correction A shouldbe applied to compensate for the difference in de-flections at joint face(s) under load between methodA and method B, and be such that

aA=~1+aB2+6

The value of d shall be determined empirically byactual measurements obtained on the two differenttypes of equipment used. Since the detailed designof the checking feature will vary between differentmanufacturers, the value of d established by onemanufacturer cannot be transferred to another, whoshall determine it separately. See example inannex E.

For general guidance, the value of d may be derivedfrom the formula used in the mathematical analysisof belt friction, which gives

Datum

Rlgld toe piece’~

— Checking block/./

* = dC~,MF

.fmJlm~x +(,.+ .-f”_ *e-f.,*)

;

With a value of the friction coefficient ~= 0,15, theformula becomes

dC~~F;=7X10’’’ 7X*

ms ms

(See also 16.5)

1

/)b, <200 A, BI

I 200< /)b, <500-t

B

7.2 Designation of checking method

Example of the designation of method B for checkingthin-walled half-bearings with an outside diameter,DbS, of 340 mm:

Method ISO 6524-B-340

IS 11145:2002

ISO 6524:1992

8 Measuring equipment NOTE7 Figures 4 and 5 show hydraulically operatedequipment. Pneumatically or mechanically operated

Figures 4 and 5 show typical measuring equipment equipment may also be used,

for measuring the nip (crush) by method A and bymethod B, respectively.

rthectdng block Pressure gauge

~ Plvotlng toe plcce Dialgauge - \

I I n

C!a&!iI Pressure adJuetrnent valve

Movable measuring

I

head

Figure 4 – Typical measuring equipment with one column, for method A

5

IS 11145:2002

ISO 6524:1992

.,A—

Movablem “ “ “

FPressure gauge

HydrauUc ram

r

Plvotlng toe piece

i

A-P17Lneasurmg neaa

Lgauge

Dial gauge

Checking

Rlgld toe piece*)

I 1i

block

M!

ZI!EI- Ill-l

I # I

;) Bearings rnayalso bechetked uslngtwo plvotlngtoapleces.

Figure 5 – Typical measuring equipment with two columns, for method B

9 Measuring equipment requirements

The most important factors affecting the accuracyof the measuring equipment (and hence the meas-ured nip value) are given below.

9.1 Tolerance on checking load setting

The permissible tolerances are given in table2.

Table 2

F Tolerance on 1’

N 0/0

FG 2000 * 1,25

2000 <F< 5000 *1--i

I 10000 <F< 50000 I* 0,5 I

I 50000< F I + 0,25 I

Ai

i

9.2 Speed of approach of measuring head

The checking load, J’, shall be applied to the jointface(s) of the half-bearing so that shock load will notoccur. The speed of approach shall be10 mm/s * 2 mm/s.

For devices in which the speed of approach cannotbe altered, the load shall be applied, released andapplied a second time before the measurement ismade.

9.3 Construction of measuring head

The measuring head ~hall be so constructed that itis accurately guided and moves normal to the datumof the checking block. The deviation from parallelismbetween the toe piece(s) in the measuring head andthe supporting plane of the checking block shall notexceed 0,04 mm per 100 mm in a radial direction.

.

6

A—

IS 11145:2002

ISO 6524:1992 ,..-2

9.4 Accuracy of the measuring piane of thetoe pieces

10.2 Series checking biock used aione.

The peripheral length of the bore of this type ofchecking block is determined by comparison with

the master checking block.Specifications on the accuracy of the measuringplane of the toe pieces are given in table 3.

It is applied in series control without using a mastershell or a comparison shell.Tabie 3

Dimensions and tolerances in millimetres

Surface roughness in microns

Surfaceroughness Tolerance on

flatnesal?,

10.3 Series checking block with master sheiiDbs

The peripheral length of the checking block bore isdetermined by the master shell or comparison shell,the peripheral length of which was determined in themaster checking block.I Db. <160 I 0,2

I0,0015

I

I-=-:4014I-=--lThis combination of gauging tools is applied in se-ries control.

NOTE 8 For series control, a checking block may alsobe used with a checking master, but this combination ofgauging tools is not within the scope of this InternationalStandard.

9.5 Accuracy of the diai gauge

Uncertainty of measurement u <1,2 pm (~ 2u) withu = 0,3 pm 11 Checking biock requirements

A typical checking block is shown in figure 6. The

gauging part has a bore diameter & and heightllcb and holds the half-bearings to be checked.

10 Gauging toois for establishing thedatum

The checking block should preferably be of hard-ened steel and of rigid construction so that the re-quirements of clause 16 are met when thehalf-bearing is tested under load.

.-The following equipment can be used for carryingout measurements:

a master checking block (for referencemeasurements) (see clause 11),

a series checking block (for series control inproduction) (see clause 11), or

a master shell or comparison shell (for series

—

—

—

The bore of the checking block shall not be chro-mium plated.

Recesses shall be cut into the checking block to ac-commodate the nick in the half-bearings. They shallbe 1 mm wider and deeper and 1,5 mm longer thanthe locating nicks in the half-bearings.control in production) (see clause 12).

It can be used in three ways (as indicated in 10.1,10.2 and 10.3) to establish the appropriate datum forsetting the dial gauge. 11.1 Reference tooiing: Master checking biock

11.1.1 Manufacturing limits10.1 Master checking biock (used aione)

The master checking block is the comparison basisfor the other checking blocks used for series control.

Manufacturing limits and specifications for the mas-ter checking block are given in table 4.

7

IS 11145:2002

ISO 6524: 1992

i :i1,, II

Fk?ld for marking of //ltIIA]dcb,rn,~ch.mand~~~~,(~(or~~~,~b~)

mlw-K13)or K#)

fj,3) Llt6]Aj4)

EJector hale (optional) ~

..---

1) H Is recommended that the values aiven In tables 5 and 6 be observed.2)3)

4)

See 13.1 and 13.2.1.Construction for half-bearing without flange:81 may correspond to B2 or It may be adjusted to the width of the half-bearing, Le. to BNX + 1,2 mmwith KI ,nax= 0,4 mmConstructIon for flanged half-bearing I81 I see table 5K2 .hmox + O,SMM

Figure 6 – Checking block

IS 11145:2002

ISO 6524:1992 +..$),~

Table 4

i

:,

Dimensions andtolerances~n millimetresSurface rouahness in microns

~

e.

Outside diameterSurface rouglmessof Surface roughness of

Tolerance on d,~~ checking block bore Tolerance on !Ic~~ the datum

Db, R, R,

I!.)b,G 75+0,003

o~0,0030

—

75< Db, <no+0,004

o 0,2.0,00350 0,3

l10<lJ~~<160i 0,005 +0,004

0 0

—— —. —— ..—

160< fJ~, <250tO,ooe 0,4

,0,00450 0 0,6

— —. ——

250< &. <340{0<0075o

40,005

0

0,6 .— 1

340< /)b= <500I0,01 40,0060 0

11.1.1.1 Tolerances of form and orientation 11,1,3 Permissible wearing limit

It is the responsibility of the manufacturer of themaster checking block to achieve high quality re-garding tolerances of form and orientation, the val-ues of which are given in tables 5 and 6.

11.1.1.2 Surface roughnesses R.t and /?.z

See tables 5 and 6.

11.1.1.3 Specifications for 111,11~and 1]3

The tolerance specified in 11.1.1 for the masterchecking block shall not be exceeded through wear.If wear occurs within the specified tolerance range,then it will be necessary to change the correctionfactor.

11.2 Series gauging tools

See tables 5 and 6.11.2.1 Series checking block used alone

‘i 1.1.2 Measuring accuracy of equipment used forestablishing d&~,M and ll~b~,M

Determination of &n,M and ~f~b~~ shall be carriedout using measuring equipment with a tolerance of

A 0,001 mm, for &~ <160 mm

+ 0,002 mm, for d=~l,,>160 mm

These values are necessary for calculating the cor-rection factor FCO,~~~ (see 13.1), which is based onthe peripheral length, determined from the formula:

1 –d(

‘icbm,Mcbm,M — cbm,M x ; + 2 ll~b,~,M– ‘-~

)

Since the peripheral length of this checking blockbore is determined by comparison with the masterchecking block (11.1). larger tolerances for dCb$and~/Cb~are acceptable.

11,2,1.1 Manufacturing limits

Manufacturing limits and specifications for the se-ries checking block are given in tables 7 to 9.

11.2.1.2 Correction factor, ]’&,,Cb~

See 13.2.1.

IS 11145:2002

ISO 6524:1992

Dimensions and tolerances inmlllimetres

.Wrface roughness In microns

Tolerances of form and orientationFlanged bearingBearingwithoutflange

Bamin

Surfaceroughness

R,lBt ~inDb. t, tljt, 12

Bmax+ 0,4

L)b, <75

75< Db, <no - 0,002

——

0,005

0,007

0,002 0,002 0,002 0,002 0,0051,2

llo<Db, <160I Zmin—0,05Zmin – o,’

0,005

——0,007

1,60,005 0,004 0,003 0.006

340< Db,<500

Dimensions and tolerancesin millimetres


Surface roughnessToleranceon

parallelism

R,, t7B l?,+2

(1

I 0,002...--

-~55<BG80 1,2

k“

0,003

0,004I

80<B B+5

Table 7Dimensions and tolerancesin millimetres


Surface roughness of Surface roughness of

Db, Tolerance on d,k checking block bore Tolerance on [lc~= the datum

R. R.\

I>b, G 75i0,008 I 0,0080 0

——

75< Q,, <I1O+0,01 0,2

10,0090 0 0,3

.——

llO<D~, <160+0,012 ,0,010 0

—— .— —.——

160< ~~~ <250i 0,014 0,4

,0,010 0 0,6

..-. _—

250< D~, <340I 0,017 +0,011o 0

—— 0,6 ——.—I0,022

1340< Db, <500

!0,012o 0

&—

IS 11145:2002

ISO 6524:1992 &

‘i.$

4Table 8 i

Dimensions and tolerances in millimetres$6

Surface roughness in micronsIm SurfaceI

Tolerances of form and orientationroughness

Flanged bearing

II 1 man

Zmin— 0,05

+

‘1 min

‘rnin -0,1

16

0,01

0,012

[.2 rlj

0,004 0,0041,2

0,004

0,01

0,014——

0,004

0,008

0,004

0,006

I 75< Db, <no II 110< D~3<160 I IBma,+ 0,4

1=-===1

*

Table 9Dimensions and tolerances in millimelres

Surface roughness in m!crons

Surface roughnessTolerance on

parallelism

11 <55I

60I I 0,004

I—... -i t————— ..--55< B<80 I 85 I 1,2 I

0,006

-~——————l l-— —80<B I 13+5 I I 0,008

11.2.1.3 Permissible wearing limit 11,2.2 Series checking block with master shellerwith comparison shell

The limit of permissible wear of the series checkingblock is reached when the difference between thecorrection factor in original and worn conditions isequal to the values stated in table 10.

11.2.2.1 Manufacturing limits

Manufacturing limits and specifications for the se-ries checking block are given in tables 7 to 9.

11.2.2.2 Correction factor

See 13.2.2.

11,2,2.3 Permissible wearing limit

The limit of permissible wear of the series checkingblock is reached when the difference between thecorrection factor in original and worn conditions isequal to the values stated in table 10.

Table 10Y

Permissible differenced

C bs lFcor,cbs,nmv - ~’.or,cbs,wornl

mm mmI

I dcb,<75 0,012

I 75<dC~, <110 I 0,016 I

I 250< dC~,S 340I

0,03I

II 340< dCb,<500 I 0,04 I

11

IS 11145:2002

ISO 6524:1992—

fi 2 Master shell and comparison shellrequirements

12.1 Master shell requirements

The basic dimensions of the master shell shall cor-respond to those of the half-bearings to be checked(see figure 7), The master shell shall have similarbehaviour to the half-bearing when it is fitted into thechecking block.

rNOTE 9 This cylindrical master sheH is also used forchecking flanged half-bearings.

Commonzone

P

// tfl A 2)

n t9

Master shells shall be made from hardened steel(58 HRC min.). Normally master shells are only usedup to 200 mm diameter.

!In order that a single master may be used for agroup of parts down to 1 mm undersize, .J~~shall beequal to the total wall thickness .!tOtof the standardhalf-bearing to be checked plus 0,125 mm.

s ~. = Slot + 0,125 mm

1) See 13.2.3.2) Tolerances on para[lellsm te ond flatness t9 apply when the master shellIs fitted In the checking block (zero free spread) under the checking load.

Bms—-—

2

------------------ ----

Figure 7 – Master shell

12

IS 11145:2002

ISO 6524:1992

The master shell shall be of similar geometry to that 12.1.1 Manufacturing limitsof the bearing being checked. Masters of a differentgeometty from that of the shell shall not be used Manufacturing limits and specifications for the mas-since friction and elastic deformation will differ sig- ter shell are given in tables 11 and 12.nificantly from those of the bearing, See figure 8.

Figure 8 – Stepped master shell not suitable forchecking bearings of uniform wall thickness

12,1,2 Correction factor, J&r,~~

See 13.2.3.

12.1.3 Permissible wearing limit

The limit of the permissible wear of the master shellis reached when the difference between the cor-rection factor in original and worn conditions isequal to the values stated in table 13.

Table 11Dimensions and tolerances in millimetres


Tolerance on 11~, Tolerance on .~~, Surface roughness

Dms R,~ R,~

l.)~, <160 f 0,1 * 0,0150,2 2

160< I)m, <200 + 0,15 * 0,02

Table 12DimWIsions and tolerances In millimetres

Surface roughness In microns

I Surfsce roughness I Tolerance onparallelism I Spresd

Dm, Ra4 (8

Dm~ <160 0,3 0,004 Within the limits of—— .—-. the half-bearing to be160< .O~, <200 0,5 0,006 checked

Tolerance on flstness

IQ

0,003

----

13

IS 11145:2002

ISO 6524:1992

13.2 Series control tooling

A—

Table 13

I Permissible difference1) IF -Fcar,m,,wornlcor, ms, rmw

m~ mm

fl~.< 160 0,03

160< fl~~ <200 0,035

12.2 Comparison sheii requirements

For economic reasons, the nip of the half bearingsmay be determined using comparison shells ratherthan master shells.

Comparison sheiis shall be made from stainiesssteei or cold or hot worked tool steel. in speciaicases, a normal production bearing may also beused.

The reiative manufacturingupon between manufacturer

13 Correction factors

limits shall be agreedand customer.

13.1 Reference tooiing: Master checking biockcorrection factor, ~CO~,C~,,,

The measured peripheral iength of the masterchecking biock bore, /C~~,~, is given by the foliowingequation (see 11.1.2):

( dcbm,M&n,M = dC~m,MX : + 2 /f~brn,M– ~

)

The theoretical peripheral length of the masterchecking block bore, /~bm,th,k fJk3’I by the fOllOWing

equation (see 11.1.2):

1 –dn

cbm,th — cbm,th x —2

The correction factor of the master checking blockis therefore

The other factors to be taken into consideration,their determination and calculation are given in an-nex A (for method A) and annex B (for method B).

The basis for the correction faCtOr z7&,@rn is the

datum of the master checking block (see figures 2and 3).

13.2,1 Correction factor for series checking biockused alone, &Or ~b~

The correction factor “’cor,cbs is the difference be-tween the nip of a half-bearing measured in a mas-ter checking block (~b,,l) and in a series checkingblock (~b~) under equal checking conditions (seeannex C):

~cor,cbs = %bm,M – %bs,M

When setting the dial gauge, the correction factor&r,&~ of the series checking block only shall betaken into consideration.

The basis for the correction factor I’ cor cbs is thedatum of the series checking biock.

13.2.2 Correction factor for series checking biockwith master shell

The correction faCtOr ~~~r,~bs of the SWkS checkingbiock should not be taken into consideration whencarrying out measurements; it is only to check thewearing limit of the series checking biock.

When setting the dial gauge, the correction factorl~cor,m.of the master sheli only (see 13.2.3) shali betaken into consideration.

..-.13,2.3 Master sheil correction factor, J’CO,,m~

The correction factor l~O,,m~is the amount by whicha master shell fitted in a master checking blockbore, under a predetermined checking load, devi-ates from the theoretical peripheral iength of themaster checking biock bore.

For determining the correction factor l\Or,m~, see an-nex D.

When setting the dial gauge, the correction factor ofthe master shell (/: ~or,mJ shall be taken into consid-eration.

The basis for the correction factor ~COr,m$is the jointface of the master shell, the peripheral iength ofwhich shail be measured in a master checkingblock, in accordance with 13.1.

NOTE 10 The correction factor FCOr,mis equal to zerowhen the master shell is exactly adjusted to the peripherallength of the master checking block bore, the bore diam-eter &.~ of which corresponds to the outside diameterD~, of the haif-bearing to be checked.

13.2,4 Comparison sheii correction factor, FcOr,c~

TfIe COITeCtiOn factor ~cor cs is the amount W which

a comparison shell fitted in a master checking biockbore, under a predetermined checking load, devi-

14

ates from the theoretical peripheral length of themaster checking block bore.

For determining the correction factor FCO,,C$,see an-nex D.

When setting the dial gauge, the correction factor of

the COmpariSOn shell ~cor,cs shall be taken iIItO COII-sideration.

The basis for the correction factor &.$ is the jointface of the comparison shell, the peripheral lengthof which shall be measured in a master checkingblock, in accordance with 13.1.

NOTE 11 The correction factor FCO,,CSis equal to zerowhen the comparison shell is exactly adjusted to the pe-ripheral length of the master checking block bore, thebore diameter dC~~of which corresponds to the outsidediameter ~~g of the half-bearing to be checked.

13.3 Marking

The correction factor calculated shall be engravedon each of the gauging tools.

Is 11145:2002

ISO 6524:1992

A14.5 Determine the nip variation of the half-bearing, in the case of method A, by reading off thedial gauge di’kectly or, in the case of method B, byadding the partial nip variations recorded on the twodial gauges. !,; t.,*

14.6 The measuring temperature shall be between20 ‘C and 25 ‘C when using the master block, butseries checking may take place at room tempera-ture if both the measuring equipment and the half-bearings being checked are at the sametemperature.

14.7 When carrying out reference measurements,the value of the nip is the average of threemeasurements taken at a temperature of 20 “C.

15 Condition of the half-bearings to bechecked

The joint and back faces of the half-bearing shali befree of foreign matter. grease and any damage, andshall be at the same temperature as the checkingblock being used.

In cases of dispute, the setting shall be made in ac-cordance with the determined correction factor in amaster checking block (see 13.1). The method shallbe agreed between the manufacturer and customer.

14 Typical checking procedure

14.1 Place the checking block in the measuringequipment, line it up and secure it against lateralmovement.

14.2 Set the checking load in accordance withspecifications.

14.3 Under the specified checking load, lower thepivoting toe piece (for method A) or the toe pieces(for method B) vertically onto the datum of thechecking block or onto the joint face of the mastershell, or of the comparison shell.

In the case of method A, adjust the dial gauge to thefull value of the correction factor engraved on either

.) the masterthe checking block (Jcor,cb or ‘cor,cbs I

shell (FCO,,~J or the comparison shell (rc~r,c$).

In the case of method B, adjust both dial gauges toone-half of the correction factor (see figure 3).

14.4 Place the half-bearing to be checked (seealso clause 15) in the checking block and apply thechecking load via the measuring head.

13.4 Reference setting

16 Measuring errors

16.1 Errors due to the measuring equipment

These errors are due to“--

—

—

—

—

—

—

an incorrect position of the checking block(longitudinal or transverse direction);

the checking block being incorrectly fixed in themeasuring equipment;

an incorrect setting of the checking load;

an excessive speed of approach of the load;

the pivoting toe piece being too tight or havingtoo much clearance;

damage or wear of the toe piece(s).

16.2 Errors due to the checking block

These errors are due to

— the difference in temperature between the half-bearing and checking block

— damage or wear of the checking block

– the recess for locating nicks being too large;

— the locating nick fouling the notch in the checkingblock;

15

IS 11145:2002ISO 6524:1992

6—

—

—

—

—

.-

—

the bore of the checking block being chromiumplated;

/the fixed stop (for method A) not covering thetotal joint face of the bearing;

the fixed stop (for method A) deflecting too muchand/or being poorly attached:

damage or wear of the fixed stop;

the checking block width fl~ being smaller thanthe bearing width in the case of bearings withoutflange;

the checking block width 1]1 or l.lq for flangedbearings being too large, so that bearings are incontact with the checking block at the fillet radiusbetween back and flange (Kf or K2 incorrect),

16.3 Errors due to the correction factor


— an incorrect reading-off when measuring &,Mand llCb,~:

— an error in calculating the correction factor.

16.4 Errors due to the half-bearing


— grease, dirt or damage on the outside diameteror joint face;

– joint face taper being excessive.

16.5 Error due to the choice of checkingmethod

An error may arise if the correction d is not consid-ered when the half-bearing is tested by a methodother than the method specified on the bearingdrawing (see 7.1 and E.3).

17 Accuracy of methods used

This clause gives a statistical approach to evaluat-ing the accuracy of the methods used by cfetermin-ing the repeatability and the reproducibility of themeasurement results and by comparing results ob-tained with methods A and B.

17.1 Checking conditions

See table 14.

17.2 Limits

The values given in table 15 are a basis for inter-preting the test results.

17.3 Caicuiation

Details of the methods of calculation and the inter-pretation of the test results of repeatability,reproducibility and comparability are given inannex E.

18 Specifications on bearing drawings

The following should be specified in the drawing,represented graphically or otherwise, for the meas-urement of the nip:

a) the recommended checking method (A or B) (seeclause 7);

b) the checking load;

c) the nip (crush);

d) diameter &,1, and the distance from the bottom..,,. .of the checking block to the

19 Specifications for thechecking means

datum plane, flcb,t~.

controi of the

19.1 The gauging tools shall be checked regularly,significant damage made good and any dimensionalchanges to the gauging tools engraved on them.

19.2 The measuring equipment shall be checkedas to its accuracy, at specified time intervals (withregard to statistical methods).

-- -

16

&

IS 11145:2002

ISO 6524:1992 a

.- =.- . .

Reproducibility

Datum Repeatability ComparabilityCase 11) Case 22)

Half-bearings s s s sMeasuring equipment s Sorl lor S D

Checking block s s ior D D

Operator s Sor D D D

Checking place s Sor D D D

Checking time Short period D D D

Key

S: Same - physically the same.

1: Identical = in accordance with this International Standard, made to the same design, drawings and specifications.

D: Different = in accordance with this International Standard but made to different designs, drawings and specifications.

1) The same half-bearings are checked in the same checking block with the same checking equipment, or with anidentical one (in which the checking block can be mounted), by a single operator or different operators working in thesame or in different places at different times.

2) The same half-bearings are checked in identical or in different checking blocks, with identical or different checkingequipment by operators working in different places at different times.

Table 15

Repeatability Reproducibility Comparability~)

Db* a*~ IE, – q IFA- q

max. max.

Case 12) I Case 23)

mm pm pm urn

Elb=<75 1,1 3 8 10

75< 1)~, <160 1,4 4 9 14

160< D~~<340 2,2 6 16 24

340< Db, <500 2,8 8 18 30

1) In order to achieve these values, especially for thicker bearings, a good contact between the toe piece (fixed stop)and the bearing joint faces is of prime importance.

2) The same half-bearings are checked in the same checking block with the same checking equipment, or with anidentical one (in which the checking block can be mounted), by a single operator or different operators working in thesame or in different places at different times,

3) The same half-bearings are checked in identical or in different checking blocks, with identical or different checkingequipment by operators working in different places at different times.

17

IS 11145:2002ISO 6524:1992

Annex A

(~ormative)

—.-J

Determination of the corredlon tactor of the master checking block – Method A

A.1 Calculation form

Firm Number of drawina 1 TvDe of bearing. .....

‘ch’h=~mm Il!”lllmm‘rn~=-mmI 1

Sto, =

‘=ulnm” Bcbml 0rBcbm3, min = mmJ

I Actual peripheral length before correction (~ figure A.l)

dcbm, M X ; = [11)111X 1,5708 = ~ 111! 1! 111 mm

2 Deviations AICbmland Afcbti (take signs into account, sea note under figure A.1 )

AICbml =

Alcbti = •~~]x

X Alcbm =•~1””~ -•1 m ‘m

) Elastic variation of Hcbmr~ (see figure A.2)

Hch ,hF[11)111 ‘UImn

lHCti = I 1mm

5 x 105 x wBcbml =

““X- ‘H [

1

4 Elastic depressions at the fixed stop and toe piece (see figure A.3)

O,ooo03F~El + PU = .

Stot B 0’”03’ y, = ❑ ~ ‘m

-xl 1 #

5 Flexibility of the fixed stop under checking load Alcb (see figure A.4)

•1+

m ‘m

6 Measured peripheral length (after correction)

/ch,,l=x(lto5)= ❑[II)IIW

mm

7 Theoretical peripheral length

(Cbm,~h= dcbm,~h x ;‘~x’’m’=~-lll!lllll ❑ mm

8 Correction factor for master checking block

Corcbm= E [JIIl ‘mF

~~ ~mm

Determine stepa 1, 2 and 5 by meaauremant.

...-

1

IS 11145:2002

ISO 6524:1992 -

Ii

dcbm, M de~~~NOTE — Afcb.l = &~l,M – ~ and AfC~~2= ff~b~Z,M‘~

Figure .A.1

=)-...+.4+

w

Bcrml

-------- ------- -.

.“--

NOTE –wisthe width of thetoe piece contact area, inmillimetres.

.,A—

IS 11145:2002

ISO 6524:1992

.—. —

F

_

Ai

NOTE – p~l and p~2are negligible if the measuring planes of the toe piece and the fixed stop are coated with hard carbide.

Figure A.3

...--

vF

*

..—.

IS 11145:2002

ISO 6524:1992 -

A.2 Numerical example

Firm Number of drewing Type of bearing

‘cbm, th = 151415[217 I mm .Y,~= H191510] ‘m‘“X = -‘m

F= II 5181010] N ‘CbOII or ~cbm, min =~ ‘m

1 Actual peripheral length before correction (see figure A.1 )

dch, Mx:=II 51415 ]2[2] x l~5708= ~ II 01fj1614 1219 I mm

t2 Deviations AICbmland AICb~ (take signs into account, aaa note under figure A. 1)

Alchl =

Alcw =EH@lHl:

Z Alcbm =•ml”m~ -•1 Iolo]olflo[ ‘m

3 Elastic variation of HCbm,,h (sea figure A.2)

Hch ~hFAHch =

~xl ] ‘51810101 ❑._5 x 1(YIx wBchl = Ill, 010101019] ‘m

Emoox~lxl 13151010]

4 Elastic depressions at the fixed stop and toe piece kea figure A.3)

O,(MO03 x0,00003 F m 51810101

/+1+ pu =B= •1 I 1010]01215] ‘m

%ot

-x- = +

5 Flexibility of tha fixed stop under checking load A/Cbm(see figure A.4)

•1+ Iolololzl ‘m

6 Measured peripheral length (after correction}/cbm,M=z(lto5) = ❑ [1 8151614151sj MM


; = 1~1 x 1.08= -—- _~cbm, th = dcbm, th x — •1 II 8i5i6i41f 13[ mm


Cor,.b. = ❑ m] ‘m ~FEl - ‘m

Determine steps 1, 2 and 5 by measurement.

IS 11145:2002ISO 6524:1992

Annex B

(normative)

of the correction factor of the master checking block—Method B

6.1 Calculation form

Firm Number of drawing Type of bearing

‘cbm th =

~ ‘m

Stm = Hjlllmm

‘“ax = -‘m

‘= UUUIN BctiI or “cm, mm =

- ‘m

1 Actual peripheral length befora correction (see figure B.1)

dch, Mx:=111)111 x 1,5708 = ~

~ ‘m

2 Deviations Alcbmt and AICbti (take signa into account, see note under figure B.1)

AIC~l =

AICb& =EBBI:

Z AICbu, =H~lm”’~ H QIIIl ‘m

3 Elastic variation: AZfCbm= AHchl + AHCM (see figura B.2)

‘cbm, th F =[11!11 Ixmlmn

AH=ti =2,5 X 105 X W Bcbml z~~xmxugn ‘H’’’!’’”]

mm

4 Elastic depressions at both toe pieces (see figure B.3)

0,000 03F~El+ P= =

——Stot B “:”;xy = ❑ ~ ‘m

[Ij‘-

5 Maasured peripheral length (after correction)

/ti, M=x(lto4)=~~ ‘m


lCbill, th = dctxn, th X : =Ill

X 1,5708= ~

I •~mm


Fcor, cbm =

E__LLDmm~+•1 1)11111

mm

Determine stepa 1 and 2 by maasuremant.

.- --

IS 11145:2002ISO 6524:1992 a

;~

dcbm,M dNOTE —AIC~.l= fIC~ml,M– T cbm,M

and AIC~.2= IfCb&,M– ~

Figure B.1

13chl

--------- ----.----

..--

F1 F2

J

I

.-

NOTE – w is the width of the toe piece contact area, in miliimetres.

IS 11145:2002ISO 6524:1992

FI

e+ —.—.—-

I

NOTE – p~l and p~zare negligible if the measuring planes of the toe pieces are coated with hard carbide.

Flgura B.3

..

24

.

B.2 Numerical example

Is 11145:2002

ISO 6524:1992 &

Firm Number of drawing Type of bearing

‘cbm, th = [ 151,4j5]2]j I mm “t” = -‘m ‘“x= -‘m

F= 15[8[0]0] N BcbmlorBcbd,rnin =

- ‘m

1 Actual peripheral length before correction (see figure B. 1)

dcbm, ~ X ~ = II 514151212] x 1’w08=~ H 815]6141Z191 mm

2 Deviations AICbmTand A[Cb~ (take signs into account, see note under figure B. 1)

Yi:m H EfEBKZAlcbm=

ElqmIzlm”~ El EJmIm ‘m

3 Elastic variation: AHcbm= AHcbml+ AHcb~ (see figure B.2)

Hcbm, th F = ~x~ I I’l’l”lol _ ❑AHcbm= —

[11, 0101011181mM2,5 X 105 X Wl?cbml

250alox~j”ml

4 Elastic depressions at both toe pieces (sea figure B.3)

O,ooo03 x0$0003 F Ill 5181010

k + pEZ=B=

‘=~m 10/0101215] ‘mStot

H, 41915101qTTq6Tq

5 Measured peripheral length (after correction)

❑/cbm, M=z[lt04)= + ]015k51412\6[ mm


/cbm, th = dcbm, th x ~ = 1514151211] ❑x1,5708= ~ -II 0]5]614]4]31 mm


Fcor, cbm =lzJDpzIzl”’m~+ •1 - ‘m

Determine steps 1 and 2 by measurement.

.- -

e—

IS 11145:2002

ISO 6524:1992

Annex C(normative)

Determination of thecorrection factor of the series checking block used alone

C.1 Determination of nip value in masterchecking block

C.1.l Fit the master checking block in the meas-uring equipment.

C.1.2 Adjust the checking load J’ in accordancewith the specifications.

C.1.3 Lower the measuring head with the toe pieceonto the datum plane of the master checking block.

C.1.4 Set the correction factor (&,,CbJ of themaster checkingchecking load 1~.

C.1.5 Place theing block.

C.1.6of the

C.1.7

C.2

Apply the

block on the dial gauge under

half-bearing in the master check-

checking load ~on the joint face(s)half-bearing.

Read the result, aC~fl,,M,off the dial gauge.

Determination of nip value in series

checking block

C.2.1 Fit the series checking block in the measur-ing equipment.

C.2.2 Set the same checking load F’ as in C.I.2.

C.2.3 Lower the measuring head with the toe pieceonto the datum plane of the series checking block.

C.2.4 Set the dial gauge to zero under checkingload K

C.2.5 Fit the same half-bearing used in C.1.5 in theseries checking block.

C.2.6 Apply the checking load Fon the joint face(s)of the half-bearing.

C.2.7 Read the result, aC~~,M,off the dial gauge.

C.3 Determination of correction factor

The difference between the two nip value readingsin C.1.7 and C.2.7 is the correction factor:

I:or,cb, = acbm,~– ~b,,M

The ICO,CbSvalue can be set on the dial gauge to aplus or minus indication.

EXAMPLE

‘f %bm,M = + 40 pm and a~b~,M= + 45 Vm, then

~&,,Cb~= 40 – 45 =‘- 5 pm

and the dial gauge is set to – 5 pm.

.--

26

IS 11145:2002ISO 6524:1992

Annex D(normative)

“&

I Determination of the correction factor of the

ID.1 Peripheral length of master shell

1

I The peripheral length of the master shell should beapproximately equal to that of the half-bearing to bechecked.

D.2 Calibration of master shell anddetermination of correction factor F’CO,,~~

D.2.1 Fit the master checking block in the meas-uring equipment.

D.2.2 Adjust the checking load 1; in accordancewith the specifications.

D.2.3 Lower the measuring head with the toe pieceonto the datum plane of the master checking block.

D.2.4 Set the correction factor (FCO,C~J of themaster checking block on the dial gauge underchecking load F, and keep it unaltered until checkingis completed.

D.2.5 Remove the measuring head with the toepiece from the master checking block.

D.2.6 Place the master shell in the master check-ing block.

D.2.7 Apply the checti”~’lbad Fon the joint face(s)of the master shell. .

iD.2.8

P this isshell.

I D.2.9

Read the measuring result off the dial gauge;the correction factor, &,,~~, of the master

Engrave the correction factor l;o,,~~ on themaster shell.

rI

D.3

The

master shell or comparison shell

Peripheral length of comparison shell

peripheral lenath of the com~arison shellshould be approxim~tely equal to that of the half-bearing to be checked.

D.4 Calibration of comparison shell anddetermination of correction factor F’CO,,C~

0.4.1 Fit the master checking block in the meas-uring equipment.

D.4.2 Adjust the checking load ~ in accordancewith specifications.

D.4.3 Lower the measuring head with the toe pieceonto the datum plane of the master checking block.

D.4.4 Set the correction factor (&r,CbJ of themaster checking block on the dial gauge underchecking load l’, and keep it unaltered until checkingis completed.

D.4.5 Remove the measuring head with toe piecefrom the master checking block.

D.4.6 Place the comparison ‘shell in the masterchecking block.

D.4.7 Apply the checking load Fon the joint face(s)of the comparison shell.

D.4.8 Read the measuring result off the dial gauge;this is the correction factor, FCO,,C$,of the comparisonshell.

0.4.9 Engrave the correction factor &,,C~ on thecomparison shell.

.-

27

IS 11145:2002ISO 6524:1992 _

Annex E

(normative)

Tests and calculation of repeatability, reproducibility ancJ comparability

E.1 Calculation of standard deviation ofrepeatability

E.1.l Take and number 24 half-bearings (n= 24).

E.1.2 Place the first bearing in the checking blockand measure it. Measure the remaining 23 bearings.

E.1.3 In accordance with the checking conditionsgiven in table 14, place the first bearing in thechecking block to carry out a second measurement.Measure the remaining 23 bearings.

E.1.4 Determine the difference A!. between the firstand the second measurement of the individualbearings with correct signs.

E.1.5 Calculate the standard deviation, ~A:

The repeatability of the checking method used isconsidered correct if

aA < UA~ (see table 15)

NOTE 12 u~ is an estimate of the true standard devi-ation m.

E.2 Assessment of reproducibility

The test is carried out as specified in E.1.l andE.I.2, with a first set of measuring equipment, andthen with a second set of measuring equipment, inaccordance with the checking conditions given intable 14.

Calculate the mean value achieved with each set ofmeasuring equipment:

n

zX,i 24i=l 1~1 = .—

n E24 , ‘li

and.

j,.The reproducibility of the method used is consideredcorrect if

I.T, – .Yzl < values given in table 15,

E.3 Assessment of comparability

Test the accuracy of method A with method B asfollows.

E.3.1 Calculate XA (or XJ as specified in E.2

E.3.2 Calculate .~ (or ~), the value of the nipmeasured with method B transposed to method A(or, reciprocally, with method A to method B):

~*=.Fg+J

3B=ZA–6

where

Z~ (or.@ are calculated as specified in E.2;

8 is determined by the bearing manu-facturer from the particular condi-tions of friction in the equipment.

E.3.3 Calculate l.~A– 7AI (or l=’ -- ,YJ).

The comparability is considered correct if the resultis less than the value given in table 15. -

EXAMPLE

Twenty-four half-bearings with an outside diameterof 100 mm are to be checked.

The recommended method of checking is method A(see table 1), which is specified on the drawing.Nevertheless, the manufacturer decides to applymethod B.

28

The manufacturer measures the 24 bearings usingmethod B and determines ~B:

z(aB, + a~2)

.YB==24

—=35Um

The rna~ufacturer determines empirically the cor-rection d to be applied, for example 7 pm (to becompared with the approximate value given inclause 7,

100 x 9000‘=0’7 x10-8x 2,25x40

= 7 Urn)

and determines <A:

2~=35+7= 42pm

Is 11145:2002 —.

ISO 6524:1992

When the customer receives the half-bearings,he/she carries out an acceptance test with the re-commended melhod A and finds a mean nip value,aA mean,of

aA,~$~.= + 50 Vm = YA

Hence

lX~–.fi[=5O-44=6pm

Since 6<14 (see table 15), the accuracy is correct.

29

,bBureau of Indian Standards i

.,

BIS is a statutory institution established under the Bureau of Indian Standards Act, 1986 to promote kharmonious development of the activities of standardization, marking and quality certification of goods and /’

attending to connected matters in the country.

Copyright

BIS has the copyright of all its publications. No part of these publications maybe reproduced in any form without [j

thk prior permission in writing of BIS. This does not preclude the free use, in the course of implementing thestandard, 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 reaffirmed 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 issueof ‘BIS Catalogue’ and ‘Standards : Monthly Additions’.

This Indian Standard has been developed from Doc : No. BP 3 l/LM 11( 0418).

Amendments Issued Since Publication

Amend No. Date of Issue Text Affected

BUREAU OF INDIAN STANDARDS

Headquarters:

Manak Bhavan, 9 Bahadur Shah Zafar Marg, New Delhi 110002 Telegrams: ManaksansthaTelephones: 3230131,3233375,3239402 ( Common to all offices)

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