Bsi bs au 180 4 1982 (2000) iso 6313 1980

BRITISH STANDARD AUTOMOBILE SERIES BS AU 180 4 1982 ISO 6313 1980 Brake linings — Part 4 Method for determining effects of heat on dimensions and form of disc brake pads [ISO title Road vehicles — Bra[.]

[ISO title: Road vehicles— Brake l ning s— Efects of heat on

dim ensions and form of disc brake pads— Test proc dure]

U C 6 9.1 -5 7.6:6 0.1

This Bri shStan ard, ha ing

b en pre ared u der the

directonof the Automo ile

Stan ards Commi e ,

waspublished u der the

authoriyof the Bo rd

of BSI an comes

into efect on

3 Mar h1 8

© BSI0 -2 0

This BritishStand rd has be n prep red u der the direction of the Automobie

Stand ards Commit e and is identical with ISO6 13:19 0 “ R oa d vehicle —

B r a ke lnings— Efe ts o hea t on d imensions a nd f r m o d is br a ke pa d s—

Te t pr oc d ur e ” publ shed b the International Org anization for

Stand rdization ( ISO)

Term inolog y and conventions The text of the International Stand rd has

be n a prov ed as suita le for publcation as a BritishStand rd without

dev iation Some terminolog y and certain conv entions are not identical with

those used in BritishStand rds; at ention is especialy d rawn to the fol owing

The comma has be n used throug hout as a decimal marker In

BritishStand ard s it is cur ent practice to use a ful point on the b sel ne

asthedecimal marker

W herev er the words “ nternational Stand ard” a pear, refer ing to this

stand ard , they should be rea as “ BritishStand rd”

Cros -referenc At present there is no cor esponding BritishStand rd for

ISO61 Howev er, it is intended to publsh a related stand ard at a future d te

The tech ical commit e has rev iewed the prov isions of ISO61 an has

decided that they are ac epta le for use in conju ction with this stand rd

A British Stand rd do s not purport to include al the neces ary prov isions of

a contract User of British Stand ard s are responsible for their cor ect

a pl cation

Compl anc with a British Standard does not of itselfconfer imm unity

f om leg al o l g ations

Sum m ary of pag es

This d ocument comprises a f ont cov er, an insid e font cov er, p g esi andi ,

p g es1 to4 and a b ck cov er

This stand rd has be n upd ated ( se copy rig ht d ate) and ma hav e had

amend ments incorporated This wi l be indicated in the amendment ta le on

the inside f ont cov er

Am endm ents is ued sinc publ cation

Amd No Date of is ue Comments

Pag e

Fig ure 1 — Princip l dimensions and d etermination of reference points 1

0 Introduction

This International Stand ard des ribes a method for

measuring d imensional chang es of dis brake p ds

u der the influence of heat At the same time, it

g iv es an indication of the resistance of whole dis

brake p d s to heat trans er in the direction of

a pl ed pres ures Accord ing to the desig n of the

test rig , either one or two dis brake p d s are

required for testing An ex tension of this

International Stand ard for d rum brake l ning s has

sti to be prep red

Dimensional chang es and the temperatures

recorded in ac ord nce with this test method in the

z ne of contact of the operating for es are measured

on dis brake p d s whose rub ing surace is pres ed

ag ainst a heated plate subjected to a g iv en

temperature-time prog ramme

1 Scope and field ofappl cation

This International Stand ard specifies a combined

method of measuring d is brake p ds to determine

their dimensional chang es in relation to

temperature and their resistance to heat trans er

The dimensions concerned are:

— thick es d imension;

— certain dimensions of the l ning outlne when

their v ariation ma inv olv e a mis u ctioning of

the brake

This International Stand rd a ples to dis brake

p d s for roa v ehicles Their dimensions should not

exce d8 mm in depth, 1 0mm in wid th

and20mm in thick es , being of integ ral moulded

or bonded ty pe, and the b cking plate of sol d ty pe

2 Ref r nce

ISO61 , B r a king o moto vehicle a nd their

tr a iler s—Ter minology

3 Symbols and desig na tions

For g eneral d efinitions, se ISO61

d

m

d

Ai

d

Bi

%d

i

Mean thick es of specimen p d

( se clause4)

Dimensions, pos ibly concerned , of the

lning outlne ( se clause4)

Dimensions, pos ibly concerned , of the

lning outlne at ambient temperature

after test ( se clause6)

Chang es of the pos ibly concerned

d imensions of the lning outlne

( se clause7)

Fig ure 1 — Principal dim ensions and determ ination of referenc points

4 Sa mpl ng and conditioning

Take the samples f om stock

Before placing the p d s into the test rig , rub them

down on both sides with emery p per ( g rain siz

No 1 0) so as to remov e the coat of p int fom the

b cking plate and to rend er the rub ing sur ace

itself smo th and f e f om u ev en es

Remov e any f iction material f om spig ot holes in

the b cking plate to a depth suficient to av oid

influencing the test results

In the case of dis brake p d s fit ed with a thin

flexible anti noise strip on the b ck face of the

b cking plate, prep re this strip in the same wa as

the f iction material to g iv e a g ood contact surace

Determine two reference points as shown in

Fig ure 1, an measure the thick es of the dis

brake p d at the reference points to an ac uracy

of0,01 mm The mean v alue of these two

measurements is d esig nated d

m

Measure the dimensions, if concerned, of the lning

outlne These v alues are d esig nated d

Ai

Dri a2mm diameter hole in the sid e of the l ning

d own to one of the reference points des r ibed a ov e

This hole shal be p ralel to the rub ing sur ace at

a d istance of5mm, and is used to house a sheathed

thermocouple

Dri a2mm diameter hole in the l ning b cking

plate p ralel to and same depth as the hole

d es ribed a ov e, to house a sheathed thermocouple

In the case of dis brake p d s equip ed with

anti noise strips, this hole is omit ed

Lining s exce d ing the lmits of1 0× 8 ×20mm

shal be reduced to this siz b cut ing with a

p rting -of d is and/or b surace g rind ing

5 Test rig

5.1 The test rig is composed of a rig id, electricaly

heated ste l plate, 8 mm hig h, 17 mm wid e

and4 mm thick, with d ev ices for clamping the

brake p d and for the measuring eq uipment

The test rig ma be desig ned for two brake p d s

As an ex mple, Fig ure 2 shows a test rig , which

me ts the req uirements

The rig consists of ( se Fig ure 2):

a) a clamping block( 1) prov ided with a piston

of4 mm d iameter moving easi y in the block;

b) v arious coi spring s ( 2) ensuring b deflection

d) a dial g aug e( 4) measuring displacement f om

the p d b cking plate or intermed iate plate

throug h the d ev ice ensuring the compres iv e

for e

5.2 Heating ca acity

The heating sour e shal be ca a le of bring ing the

plate to a temperature of4 0°C in10±0,5min.In

certain cases, especialy with a v iew to uti zation of

tested brake lning s on a g iv en v ehicle ty pe, it ma

be neces ary to a opt a plate temperature

a ov e4 0°C and to reach this temperature in

les than10min

5.3 Measuring equipm ent

Temperature is measured centraly in the heating

plate b means of a sheathed thermocouple in a hole

ru ning p ralel to, and5mm fom, the contact

surace ( se Fig ure 2)

In the case of d is brake p ds eq uip ed with

anti noise strips, a4mm thick8 ×10 mm

thermal cond uctiv e plate is placed betwe n the p d

and the clamping dev ice for the measurement of

heat trans er The temperature measurement on

this plate is taken b means of a sheathed

thermocouple which is situated in a hole dri led to

the centre of the plate ( se Fig ure 2) The block for

clamping the dis brake p d is prov id ed with a

d ev ice ca a le of a ply ing a for e rang e of20

to20 N Fixed on the same side the displacement

measuring dev ices shal measure the displacement

fom the p d b cking plate or intermediate plate

6 Test method

Place the d is brake p d prep red in ac ord ance

with clause4 betwe n the heater plate an

clamping block, with the rub ing surace towards

the heater plate, an clamped with a p d surace

pres ure of a out20kPa( 0,02N/ mm

2

)

In the case of d is p ds equip ed with antinoise

strips, insert the intermediate plate betwe n the

p d and the clamping block The d ial g aug es or

ind uctiv e d isplacement transd ucer are mou ted

and set to z ro

Switch on the heating at a set ing which wi result

in a final temperature of4 0°C at the en of

a10min heating period

N T In certain cases,esp cialy wih a v iew to utlizaton of

tested brake lining s on a g iv n v hicle ty pe i ma b neces ary

that this final temp rature b a o e4 0°C an re ched in

les than1 min

According to the eq uipment used, measure the

v ariations in the p d thick es and the temperature

of the heating plate, the f iction material an the

p d b cking plate or intermed iate plate d uring the

heating and co lng period

I the measurements are not taken b means of a

record er, these shal be read at25°C interv als of

heater plate temperature betwe n5 °C an the

final temperature

After the final temperature has be n reached , the

heat sour e is switched of, and the co lng period

beg ins d uring which the sy stem is alowed to co l

natural y , without any co lng air blown on to the

heater plate

As so n as the heater plate reaches5 °C, switch

the heat sour e on ag ain and repeat the proces

d es ribed a ov e No rea justment shal take place

u der any cir umstances at the beg inning of the

secon heating period

At the en of the test, measure the dimensions, if

concerned, of the l ning outl ne at ro m

temperature These v alues shal be desig nated d

Bi Fig ure 2 — Ex m ple of test rig

7 Pr sentation ofresults

7.1 I a recorder is used , the traces shal be suita ly

identified so that the record ing of chang e of p d

thick es , heater plate temperature, p d

temperature and p d b cking plate or intermed iate

plate temperature can be u ambig uously related to

the a propriate factor I anx,y

1

, y 2

, y 3

, plot er is

used , the direction of the a s is ae is control ed b

the heater plate temperature

7.2 I the v alues are read of, p d and p d b cking

plate or intermed iate plate temperature and chang e

of l ning thick es shal be plot ed on mi imetre

p per ag ainst heater plate temperature, ag ain

making sure that the curv es are suita ly identified

Finaly , if ne d be, calculate the diferences

% d

i

=d

Bi

–d

Ai

8 Test report

The test report shal contain folowing p rticular :

a) qualty d esig nation, ty pe and sup ler of the

dis brake p d;

b) mean thick es d

m

at the beg in ing of the test;

c) ma imum v alues of relativ e chang e of lning

thick es with the cor esponding temperatures

an test period ;

d) chang e of l ning thick es at hig hest

temperature for the fir t and the second test

period;

e) resid ual chang e of thick es and dimensions, if

concerned , of the lning outlne at the end of the

test when co led down to ro m temperature;

f) p d b cking plate or intermed iate plate

temperature at hig hest heater plate temperature

for the fir t and second test period;

g ) a pearance of the d is brake p ds after the

test, noting especialy any formation of c acks

an bub les, pe l ng or chip ing of fiction

material and d etachment fom the b cking plate

ISO 6313:1980

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