ISO 4468:1982
(Main)Gear hobs — Single start — Accuracy requirements
Gear hobs — Single start — Accuracy requirements
Applies to single start hobs of 1 to 40 module and 25 to 0,625 diametral pitch for helical and straight spur gears. It applies to solid and inserted blade hobs. Accuracy grades are AA, A, B and C where grade AA is the highest order of precision. Gives elemental tests for hobs and permitted tolerances for the practical test consisting of the measurement of the position of the cutting edges along a line of action which requires special equipment.
Fraises-mères à une entrée — Tolérances
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International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION@ME~YHAPO~HAR OPrAHM3A~Mfl fl0 CTAH~APTbl3A~WWORGANISATION INTERNATIONALE DE NORMALISATION
Gear hobs - Single Start - Accuracy requirements
Fraises-mkres a une entrhe - Tokrances
First edition - 1982-01-15
Ref. No. ISO 4468-1982 (E)
UDC 621.914.6 : 621.833
üi
-
Descriptors : miliing Cutters, gear hobs, accuracy, tolerantes.
Price based on 16 pages
---------------------- Page: 1 ----------------------
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bedies). The work of developing Inter-
national Standards is carried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft international Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 4468 was developed by Technical Committee ISO/TC 60,
Gears, and was circulated to the member bodies in June 1980.
lt has been approved by the member bodies of the following countries :
Australia France Romania
Austria Germany, F. R. South Africa, Rep. of
Hungary
Belgium Spain
India
Bulgaria Sweden
Canada Italy Switzerland
Czechoslovakia Korea, Rep. of United Kingdom
Egypt, Arab Rep. of Netherlands USSR
Finland Poland
The member bodies of the foll owing countries expressed disapproval of the document
on technical grounds :
Japan
USA
International Organkation for Standardkation, 1982
0
Printed in Switzerland
---------------------- Page: 2 ----------------------
INTERNATIONAL STANDARD ISO 4468-1982 0
- Single Start - Accuracy requirements
Gear hobs
1 Scope and field of application
ISO 17, Guide to the use of preferred numbers and of series of
preferred numbers.
This International Standard specifies requirements for the ac-
curacy of general purpose Single Start hobs of 1 to 40 module -
ISO 53, Cylindrical gears for general and heavy engineering
and 25 to 0,625 diametral pitch.
Basic rack.
These hobs are intended for producing gears which conform to
ISO 54, Cylindrical gears for general engineering and for heavy
ISO 53 and ISO 54.
engineering - Modules and diametral pitches.
This International Standard applies to Single Start hobs for
ISO 2W1, ISO System for limits and fits - Part 7 : General,
helical and straight spur gears. lt applies to solid (monobloc)
tolerantes and devia tions. 1)
and inserted blade hobs.
ISO 701, International gear notation - Symbols for
The elemental features of hobs are graded as follows according
geome trical da ta.
to accuracy :
I SO / R 1122, Glossary o f gears - Geome trical definitions.
Grade AA, Grade A, Grade B and Grade C
where Grade AA is the highest Order of precision. ISO 2490, Single-Start solid fmonoblocl gear hobs with axial
ke ywa y, I to 20 module and I to 20 diametral pitch - Nominal
NOTE - Grade D hobs are not specified in this International Standard.
dimensions.
The values of the tolerantes for Grade D are 1,32 times the value of the
tolerantes for Grade C, except for the bore tolerantes which would
be H6.
3 Accuracy requirements
In addition to the conventional elemental tests for hobs, this
Hobs shall conform with the requirements of tables 1 and 2 or 3
International Standard gives permitted tolerantes for the prac-
as appropriate.
tical test consisting of the measurement of the Position of the
cutting edges along a line of action. This test requires special
equipment. The two groups of tests are not equivalent and one
4 Derivation of tolerantes
shall choose between one or the other. If there was no previous
(sec table 2)
agreement, the hob is regarded as belonging to the precision
class specified, if it satisfies one or other of the two methods of
lt should be noted that test 7 does not conform to a datum
inspection.
value and is not in the Statements below concerning grade rela-
tionships.
NOTE - The tolerantes in this International Standard were deter-
mined for gear hobs whose dimensions conform to ISO 2490, but with
With the exception of test 7, the datum from which all the
certain precautions they may be applied to hobs not specified in this
values in tables 2 and 3 are derived is the value of 45 Pm in test
International Standard.
14 Grade A module 16-25.
In this International Standard, the diametral pitches are given
The ratio between Grade AA and Grade A is 1,6 except for test
only on a provisional basis; they will be deleted after the period
9 and 9A where it is 1. The ratio between Grade A and Grade B
necessary to allow conversion to the metric System.
is 1,6 for tests 1 and 2 and is 1,8 for tests 3 to 6, and 2 for tests 8
to 14. The ratio between Grade B and Grade C is 2 except in the
2 References case of tests 1, 2, 4, 5, 6, 9 and 9A. In this case the ratio
adopted is 1 for practical convenience. These ratios are taken
ISO 3, Preferred numbers - Series of preferred numbers. from ISO 3.
1) At present at the Stage of draft. (Revision of ISO/R 286-1962.)
1
---------------------- Page: 3 ----------------------
ISO 4468-1982 (EI
Test 1 : Bosses; radial run-out (Test 1413,151.
The ratios between the various module ranges are indicated
test 1 and this applies to all the other tests except test 7.
Test 2 : Bosses; axial run-out (Test 14/4).
The metric values are to be taken as the basis of the tables. T
inch units in table 3 are converted from the metric values Test 3 : Teeth; radial run-out of tips (Test 14 x 1,6).
table 2. The values for tolerantes of 12,5 Fm and upwards ha
been rounded off in accordance with ISO 17. The values 4,,, Test 4 : Cutting faces of gashes; straightness and radial align-
7,5, 8,5 and 9,5 Pm have been increased by 0,5 Pm on account ment (Test 14 x 1,251.
of the smallness of the values concerned, this being allowed ac-
Test 5 : Cutting faces of gashes; adjacent spacing (Test 14 x
cording to ISO 17.
1,6).
Inch values of tolerante greater than 0,002 in have been
rounded to the nearest 0,0005 in.
Test 6 : Cutting faces of gashes; cumulative spacing (Test
14 x 3).
Tolerante on bores
Table 1 -
Test 7 : Cutting faces of gashes; lead (no relationship to
Grade of hob
Test 14).
Tolerante on bore diameter’) H5 H5 H6 H6
.
Test 8 : Tooth Profile at cutting edges (Test 14/2).
1)
In accordance with ISO 286.
Test 8A : Tooth Profile at cutting edges (Test 14/1). See notes
Standard bores shall be finished straight and parallel, within the
at end of table 2.
tolerantes given in table 1, for 75 % of each bearing length for
Grade AA, A and B hobs and 50 % for Grade C hobs.
Test 9 : Tooth thickness (Test 14 x 2,241.
A reference mandrei of nominal bore diameter shall pass
Test 9A* : Tooth addendum (Test 14 x 3,151.
through the bore as a check of alignment.
Test 10 : Tooth lead; tooth to tooth (Test 14/2,24).
Test 11 : Tooth lead; cumulative in one convolution (cyclic)
(Test 1411,251.
I
Test IIA : Tooth lead; cumulative in one convolution (cyclic)
(Test 14/1,12). S ee notes at end of table 2.
Test 12 : Tooth lead; cumulative in 3 convolutions (Test 14 x
1,4).
4.1 Key to table 2
Test 13 : Tooth spacing along line of action; Tooth to tooth
(Test 14/2,24).
The datum value for each of the tests is that for Grade A
module 16 to 25. These values are derived from the datum value
Test 14 : Tooth spacing along line of action : cumulative.
for test 14, which is 45 ym, in conjunction with the ratios
Datum 45 vrn, m > 16 to 25 Grade A.
specif ied below.
* The tooth addendum tolerantes, test 9A, are related to tooth thickness for hobs having a normal pressure angle of 20° so that :
thickness tolerante
Addendum tolerante =
2 x tangent pressure angle (20°)
= 1,374 x tooth thickness tolerante
As 1,374 approximates to the preferred number 1,4, the latter has been used.
2
---------------------- Page: 4 ----------------------
Table 2 - Accuracy requirements - Metric units
NOTE - Tests 1 to 14 may be carried out in any practicable Order.
Object Tolerantes
Test No. Element Drawing
of test
P-n
Pitch range
Grade
module
177 AA A B C
1 to 2 3 5 7 7
> 1,12
> 2 to 3,5 3 5 8 8
Radial run-out of
Boss reference
> 133
1
> 3,5 to 6,3 4 6 10 IO
boss
su rfaces
} ~25
> 6,3 to 10 5 8 12 12
> 1,32
> 10 to 16 6 IO 16 16
1 13
> 16 to25 9 14 22 22
> 115
> 25 to 40 13 21 34 34
1 to 2 2 4 6 6
> 2 to 3,5 3 4 6 6
> 3,5 to 6,3 3 5 8 8
Boss reference Axial run-out of
> 6,3 to IO 4 6 10 10
2
boss
su rfaces
> 10 to 16 5 8 12 12
> 16 to25 7 11 18 18
> 25 to 40 11 17 26 26
1 to 2 14 22 40 80
> 2 to 3,5 16 25 45 90
> 3,5 to 6,3 19 30 53 105
Radial run-out of
> 6,3 to IO 24 38 65 130
3 Outside diameter
tips of teeth
> 10 to 16 32 50 90 180
> 16 to25 45 70 125 250
> 25 to 40 380
65 105 190
1 to 2 32
11 18 32
> 2 to 3,5 12 20 36 36
Straightness and
42
> 3,5 to 6,3 15 24 42
Cutting faces radial alignment
> 6,3 to 10 19 30 53 53
4
- 4-
of gashes over cutting
@*-
> 10 to 16 25 40 70 70
depth
100 100
> 16 to25 36 55
> 25 to 40 53 85 150 150
:I:‘/:,
---------------------- Page: 5 ----------------------
Accuracy requirements - Metric units hntinued)
Table 2 -
~~ ~
Tolerantes
Object
Test No. Element
of test
um
r
Pitch range
Grade
module
AA A B C
m
14 22 40 40
1 to 2
Cutting faces of
Adjacent spacing
> 2 to 3,5 16 25 45 45
5
gashes
30 53 53
123 > 3,5 to 6,3 19
> 24 38 65 65
6,3 to 10
> 10 to 16 32 50 90 90
70 125 125
> 16 to25 45
65 105 190 190
> 25 to 40
75 75
1 to 2 26 42
30 48 85 85
> 2 to 3,5
> 3,5 to 6,3 36 55 100 100
Cumulative
45 70 125 125
Cutting faces of > 6,3 to 10
spacing
gashes > ‘IO to 16 60 95 170 170
240 240
> 16 to25 85 130
123 > 120 200 350 350
25 to 40
-- ---
Per 100 mm face
Cutting faces of
100 140
Gash lead 60 80
width
gashes
---------------------- Page: 6 ----------------------
Table 2 - Accuracy requirements - Metric units kontinued)
Tolerantes
Object
Drawing
Test No. Element
of test
Pm
T
Pitch range
Grade
module
...
SLOVENSKI STANDARD
SIST ISO 4468:1998
01-junij-1998
3ROåDVWDIUH]DOD(QRMQD=DKWHYHSRWRþQRVWL
Gear hobs -- Single start -- Accuracy requirements
Fraises-mères à une entrée -- Tolérances
Ta slovenski standard je istoveten z: ISO 4468:1982
ICS:
21.200 Gonila Gears
SIST ISO 4468:1998 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
International Standard
INTERNATIONAL ORGANIZATION FOR STANDARDIZATION@ME~YHAPO~HAR OPrAHM3A~Mfl fl0 CTAH~APTbl3A~WWORGANISATION INTERNATIONALE DE NORMALISATION
Gear hobs - Single Start - Accuracy requirements
Fraises-mkres a une entrhe - Tokrances
First edition - 1982-01-15
Ref. No. ISO 4468-1982 (E)
UDC 621.914.6 : 621.833
üi
-
Descriptors : miliing Cutters, gear hobs, accuracy, tolerantes.
Price based on 16 pages
---------------------- Page: 2 ----------------------
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of
national Standards institutes (ISO member bedies). The work of developing Inter-
national Standards is carried out through ISO technical committees. Every member
body interested in a subject for which a technical committee has been set up has the
right to be represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take part in the work.
Draft international Standards adopted by the technical committees are circulated to
the member bodies for approval before their acceptance as International Standards by
the ISO Council.
International Standard ISO 4468 was developed by Technical Committee ISO/TC 60,
Gears, and was circulated to the member bodies in June 1980.
lt has been approved by the member bodies of the following countries :
Australia France Romania
Austria Germany, F. R. South Africa, Rep. of
Hungary
Belgium Spain
India
Bulgaria Sweden
Canada Italy Switzerland
Czechoslovakia Korea, Rep. of United Kingdom
Egypt, Arab Rep. of Netherlands USSR
Finland Poland
The member bodies of the foll owing countries expressed disapproval of the document
on technical grounds :
Japan
USA
International Organkation for Standardkation, 1982
0
Printed in Switzerland
---------------------- Page: 3 ----------------------
INTERNATIONAL STANDARD ISO 4468-1982 0
- Single Start - Accuracy requirements
Gear hobs
1 Scope and field of application
ISO 17, Guide to the use of preferred numbers and of series of
preferred numbers.
This International Standard specifies requirements for the ac-
curacy of general purpose Single Start hobs of 1 to 40 module -
ISO 53, Cylindrical gears for general and heavy engineering
and 25 to 0,625 diametral pitch.
Basic rack.
These hobs are intended for producing gears which conform to
ISO 54, Cylindrical gears for general engineering and for heavy
ISO 53 and ISO 54.
engineering - Modules and diametral pitches.
This International Standard applies to Single Start hobs for
ISO 2W1, ISO System for limits and fits - Part 7 : General,
helical and straight spur gears. lt applies to solid (monobloc)
tolerantes and devia tions. 1)
and inserted blade hobs.
ISO 701, International gear notation - Symbols for
The elemental features of hobs are graded as follows according
geome trical da ta.
to accuracy :
I SO / R 1122, Glossary o f gears - Geome trical definitions.
Grade AA, Grade A, Grade B and Grade C
where Grade AA is the highest Order of precision. ISO 2490, Single-Start solid fmonoblocl gear hobs with axial
ke ywa y, I to 20 module and I to 20 diametral pitch - Nominal
NOTE - Grade D hobs are not specified in this International Standard.
dimensions.
The values of the tolerantes for Grade D are 1,32 times the value of the
tolerantes for Grade C, except for the bore tolerantes which would
be H6.
3 Accuracy requirements
In addition to the conventional elemental tests for hobs, this
Hobs shall conform with the requirements of tables 1 and 2 or 3
International Standard gives permitted tolerantes for the prac-
as appropriate.
tical test consisting of the measurement of the Position of the
cutting edges along a line of action. This test requires special
equipment. The two groups of tests are not equivalent and one
4 Derivation of tolerantes
shall choose between one or the other. If there was no previous
(sec table 2)
agreement, the hob is regarded as belonging to the precision
class specified, if it satisfies one or other of the two methods of
lt should be noted that test 7 does not conform to a datum
inspection.
value and is not in the Statements below concerning grade rela-
tionships.
NOTE - The tolerantes in this International Standard were deter-
mined for gear hobs whose dimensions conform to ISO 2490, but with
With the exception of test 7, the datum from which all the
certain precautions they may be applied to hobs not specified in this
values in tables 2 and 3 are derived is the value of 45 Pm in test
International Standard.
14 Grade A module 16-25.
In this International Standard, the diametral pitches are given
The ratio between Grade AA and Grade A is 1,6 except for test
only on a provisional basis; they will be deleted after the period
9 and 9A where it is 1. The ratio between Grade A and Grade B
necessary to allow conversion to the metric System.
is 1,6 for tests 1 and 2 and is 1,8 for tests 3 to 6, and 2 for tests 8
to 14. The ratio between Grade B and Grade C is 2 except in the
2 References case of tests 1, 2, 4, 5, 6, 9 and 9A. In this case the ratio
adopted is 1 for practical convenience. These ratios are taken
ISO 3, Preferred numbers - Series of preferred numbers. from ISO 3.
1) At present at the Stage of draft. (Revision of ISO/R 286-1962.)
1
---------------------- Page: 4 ----------------------
ISO 4468-1982 (EI
Test 1 : Bosses; radial run-out (Test 1413,151.
The ratios between the various module ranges are indicated
test 1 and this applies to all the other tests except test 7.
Test 2 : Bosses; axial run-out (Test 14/4).
The metric values are to be taken as the basis of the tables. T
inch units in table 3 are converted from the metric values Test 3 : Teeth; radial run-out of tips (Test 14 x 1,6).
table 2. The values for tolerantes of 12,5 Fm and upwards ha
been rounded off in accordance with ISO 17. The values 4,,, Test 4 : Cutting faces of gashes; straightness and radial align-
7,5, 8,5 and 9,5 Pm have been increased by 0,5 Pm on account ment (Test 14 x 1,251.
of the smallness of the values concerned, this being allowed ac-
Test 5 : Cutting faces of gashes; adjacent spacing (Test 14 x
cording to ISO 17.
1,6).
Inch values of tolerante greater than 0,002 in have been
rounded to the nearest 0,0005 in.
Test 6 : Cutting faces of gashes; cumulative spacing (Test
14 x 3).
Tolerante on bores
Table 1 -
Test 7 : Cutting faces of gashes; lead (no relationship to
Grade of hob
Test 14).
Tolerante on bore diameter’) H5 H5 H6 H6
.
Test 8 : Tooth Profile at cutting edges (Test 14/2).
1)
In accordance with ISO 286.
Test 8A : Tooth Profile at cutting edges (Test 14/1). See notes
Standard bores shall be finished straight and parallel, within the
at end of table 2.
tolerantes given in table 1, for 75 % of each bearing length for
Grade AA, A and B hobs and 50 % for Grade C hobs.
Test 9 : Tooth thickness (Test 14 x 2,241.
A reference mandrei of nominal bore diameter shall pass
Test 9A* : Tooth addendum (Test 14 x 3,151.
through the bore as a check of alignment.
Test 10 : Tooth lead; tooth to tooth (Test 14/2,24).
Test 11 : Tooth lead; cumulative in one convolution (cyclic)
(Test 1411,251.
I
Test IIA : Tooth lead; cumulative in one convolution (cyclic)
(Test 14/1,12). S ee notes at end of table 2.
Test 12 : Tooth lead; cumulative in 3 convolutions (Test 14 x
1,4).
4.1 Key to table 2
Test 13 : Tooth spacing along line of action; Tooth to tooth
(Test 14/2,24).
The datum value for each of the tests is that for Grade A
module 16 to 25. These values are derived from the datum value
Test 14 : Tooth spacing along line of action : cumulative.
for test 14, which is 45 ym, in conjunction with the ratios
Datum 45 vrn, m > 16 to 25 Grade A.
specif ied below.
* The tooth addendum tolerantes, test 9A, are related to tooth thickness for hobs having a normal pressure angle of 20° so that :
thickness tolerante
Addendum tolerante =
2 x tangent pressure angle (20°)
= 1,374 x tooth thickness tolerante
As 1,374 approximates to the preferred number 1,4, the latter has been used.
2
---------------------- Page: 5 ----------------------
Table 2 - Accuracy requirements - Metric units
NOTE - Tests 1 to 14 may be carried out in any practicable Order.
Object Tolerantes
Test No. Element Drawing
of test
P-n
Pitch range
Grade
module
177 AA A B C
1 to 2 3 5 7 7
> 1,12
> 2 to 3,5 3 5 8 8
Radial run-out of
Boss reference
> 133
1
> 3,5 to 6,3 4 6 10 IO
boss
su rfaces
} ~25
> 6,3 to 10 5 8 12 12
> 1,32
> 10 to 16 6 IO 16 16
1 13
> 16 to25 9 14 22 22
> 115
> 25 to 40 13 21 34 34
1 to 2 2 4 6 6
> 2 to 3,5 3 4 6 6
> 3,5 to 6,3 3 5 8 8
Boss reference Axial run-out of
> 6,3 to IO 4 6 10 10
2
boss
su rfaces
> 10 to 16 5 8 12 12
> 16 to25 7 11 18 18
> 25 to 40 11 17 26 26
1 to 2 14 22 40 80
> 2 to 3,5 16 25 45 90
> 3,5 to 6,3 19 30 53 105
Radial run-out of
> 6,3 to IO 24 38 65 130
3 Outside diameter
tips of teeth
> 10 to 16 32 50 90 180
> 16 to25 45 70 125 250
> 25 to 40 380
65 105 190
1 to 2 32
11 18 32
> 2 to 3,5 12 20 36 36
Straightness and
42
> 3,5 to 6,3 15 24 42
Cutting faces radial alignment
> 6,3 to 10 19 30 53 53
4
- 4-
of gashes over cutting
@*-
> 10 to 16 25 40 70 70
depth
100 100
> 16 to25 36 55
> 25 to 40 53 85 150 150
:I:‘/:,
---------------------- Page: 6 ----------------------
Accuracy requirements - Metric units hntinued)
Table 2 -
~~ ~
Tolerantes
Object
Test No. Element
of test
um
r
Pitch range
Grade
module
AA A B C
m
14 22 40 40
1 to 2
Cutting faces of
Adjacent spacing
> 2 to 3,5 16 25 45 45
5
gashes
30 53 53
123 > 3,5 to 6,3 19
> 24 38 65 65
6,3 to 10
> 10 to 16 32 50 90 90
70 125 125
> 16 to25 45
65 105 190 190
> 25 to 40
75 75
1 to 2 26 42
30 48 85 85
> 2 to 3,5
> 3,5 to 6,3 36 55 100 100
Cumulative
45 70 125 125
Cutting faces of > 6,3 to 10
spacing
gashes > ‘IO to 16 60 95 170 170
240 240
> 16 to25 85 130
123 > 120
...
Norme internation 446
INTERNATIONAL ORGANIZATION FOR STANDARDIZATlON.ME~YHAPOAHAR OPrAHM3A~MR fl0 CTAH~APTbI3AL&WWORGANlSATlON INTERNATIONALE DE NORMALISATION
Fraises-m&es B une enthe - Tolbances
Gear hobs - Single start - Accuracy requirements
Premiike hdition - 1982-01-15
CDU 621.914.6 : 621.833
FMf. no : IS0 4468-l (F)
Descripteurs : fraise mhanique,
fraise-m&e, exactitude, tolhance.
Prix bas6 sur 16 pages
---------------------- Page: 1 ----------------------
Avant-propos
L’ISO (Organisation internationale de normalisation) est une federation mondiale
d’organismes nationaux de normalisation (comites membres de I’ISO). L’elaboration
des Normes internationales est confide aux comites techniques de I’ISO. Chaque
comite membre interesse par une etude a le droit de faire partie du comite technique
correspondant. Les organisations internationales, gouvernementales et non gouverne-
mentales, en liaison avec I’ISO, participent egalement aux travaux.
Les projets de Normes internationales adopt& par les comites techniques sont soumis
aux comites membres pour approbation, avant leur acceptation comme Normes inter-
nationales par le Conseil de I’ISO.
La Norme internationale IS0 4468 a ete elaboree par le comite technique ISO/TC 60,
Engrenages, et a ete soumise aux comites en juin 1980.
Les comites membres des pays suivants l’ont approuvee :
Pologne
Egypte, Rep. arabe d’
Afrique du Sud, Rep. d’
Espagne Roumanie
Allemagne, R. F.
Finlande Royaume-Uni
Australie
France Suede
Autriche
Hongrie Suisse
Belgique
Bulgarie lnde Tchecoslovaquie
ltalie
Canada URSS
Coree, Rep. de Pays- Bas
Les comites membres des pays suivants I’ont desapprouvee pour des raisons tech-
niques :
Japon
USA
0 Organisation internationale de normalisation, 1982
Imprim en Suisse
---------------------- Page: 2 ----------------------
--_----_ - _ -_ . . -. - --. -_ . - -- --. -. .----. -.-- - _ _
NORME INTERNATIONALE
Fraises-m&es ti une entree -
IS0 17, Guide pour l’emploi des nombres normaux et des skies
I Objet et domaine d’application
de nombres normaux.
La presente Norme internationale fixe les tolerances a respecter
IS0 53, Engrenages cylindriques de mkcanique g&n&a/e et de
dans la fabrication des fraises-meres a une entree, pour applica-
grosses mkanique - Cr&mail&-e de r&!rence.
tions g&&ales de module 1 a 40 et de diametral pitch 25 a
0,625.
IS0 54, Engrenages cykndriques de mkanique g&&ale et de
grosse mkanique - Mod&es et diamktral pitches.
Ces fraises-meres sont destinees a produire des roues d’engre-
nages conformes aux Normes IS0 53 et IS0 54.
IS0 286/‘l, Systkme /SO de tokrances et d’ajustements -
Partie I : G&&alit&, tolkances et &carts. 1)
La presente Norme internationale a trait aux fraises-meres pour
engrenages droits et helico’idaux. Elle s’applique aux fraises
D SO 70 1, Notation in terna tionale des engrenages - S ymboles
rnonoblocs et aux fraises 8 dents rapportees.
des don&es g$om&riques.
Les caracteristiques essentielles des fraises-meres sont classees
comme suit, en fonction de leur classe de precision : ISO/ R 112.2, Vocabu/aire des engrenages -- D&Tnitions g&o-
rn4 triques.
Bualite AA, qualite A, qualite B et quake C; la qualite AA
&ant la plus precise. IS0 2496, Fraises-m&es monoblocs ;i une entrde, 9 entralne-
ment par clavette, de module I P 20 et de diamktral pitch I P 20
- Dimensions nominales.
NOTE - Les fraises-m&es de qualitk D ne sont pas reprises dans
la prbsente Norme internationale. Les valeurs des tolhrances de la
qualitb D sont hgales fr I,32 fois celles des tolkrances de la qualitb C,
8 I’exception des tolbrances sur le diamhtre d’aksage qui sont egales
3 Pr&kision
iI H6.
Les fraises-meres seront conformes aux prescriptions des
En complement aux essais conventionnels essentiels des
tableaux ‘l et 2 ou 3 selon le cas approprie.
fraises-meres, la presente Norme internationale donne les tole-
rances admises pour I’epreuve pratique consistant en la mesure
de la position de I’arete active le long d’une ligne d’action. Cette
4 Base d’&abIissement des tolhrances
epreuve pratique necessite un equipement special de mesure.
(voir tableau 2)
Les deux groupes d’essais ne sont pas equivalents et I’on choi-
sira I’un d’entre eux. Sauf accord prealable, la fraise-mere est
II est A noter que les valeurs reprises pour I’epreuve no 7 ne sont
consideree comme appartenant a la classe de precision speci-
pas issues d’une don&e de base, de telle sorte qu’elle nest pas
free, si elle satisfait a I’une des methodes de verification.
reprise ci-apres dans I’expose relatif au rapport existant entre
qualites.
NOTE - Les tolbrances donntjes dans la prbsente Norme iyternatio-
nale ont 6te determincjes pour des fraises-m&es de dimensions confor-
A I’exception de l’epreuve no 7, la valeur dont decoulent toutes
mes $I celles prescrites dans I’ISO 2490; elles peuvent toutefois, mais
les don&es des tableaux 2 et 3 est celle de 45 pm de I’epreuve
sous certaines rkserves, &re appliquees aux fraises-meres non reprises
no 14, qualite A, module 16-25.
dans cette dernihre Norme internationale,
he rapport entre les qualites AA et A est de ‘l,6, sauf pour
Dans la presente Norme internationale les diametral pitches ne
I’epreuve n* 9 ou ce rapport est de 1. Le rapport entre les quali-
sont donnes qu’a titre provisoire; ils seront supprimes apres la
tes A et B est de ‘l,6 pour Bes epreuves 1 et 2, de I,8 pour les
periode necessaire a leur conversion dans le systeme na&rique.
epreuves 3 8 6 et de 2 pour les bpreuves 8 a 14. be rapport entre
les qualites B et C est de 2, sauf pour les epreuves 1 - 2 - 4 -
2 R6f6renees
5-6 - 9 et 9A. Dans ces derniers cas, et pour des raisons
d’ordre pratique, le rapport adopt6 es% ‘I I Ces rapports sont
IS0 3, Nombres normaux - S&ie des nombres normaux.
extraits de I’ISO 3.
1) Actuellement au stade de projet. (Rhision de I’ISO/R 286-7962.)
---------------------- Page: 3 ----------------------
is0 4468-1982 IFI
Les rapports entre les series de modules sont donnes dans Epreuve 1 : Faux-rond des collerettes de centrage (epreuve
I’epreuve n 0 1 et restent valables pour toutes les autres epreu-
14/3,15).
ves, a I’exception de I’epreuve no 7.
ipreuve 2 : Voile des collerettes de centrage (epreuve l4/4).
Les valeurs metriques ont ete prises comme base pour I’etablis-
sement des tableaux. Les valeurs en inches du tableau 3 ont ete
Epreuve 3 : Faux-rond du sommet des dents (epreuve 14 x 1,6).
obtenues par conversion des valeurs metriques du tableau 2.
Les tolerances egales ou superieures a 12,5 pm ont ete arron-
reuve 4 : Erreurs de rectitude et d’alignement radial des faces
EP
dies conformement a I’ISO 17. Les tolerances 4,5 - 7,5 - 8,5
de coupe des goujures (epreuve 14 x 1,25).
et 9,5 pm ont ete arrondies par exces a I’unite, compte tenu de
leur faible valeur, ceci d’ailleurs conformement aux regles de
coupe suc-
ipreuve 5: Erreur d’ecartemen t entre deux de
I’ISO 17.
res (epreuve 14 x 1,6).
cessives de gouju
Les valeurs en inches superieures a 0,002 in ont ete arrondies au
Epreuve 6 : Erreur cumulee sur I’ecartement entre deux faces de
0,000 5 in pres.
coupe quelconques des goujures (epreuve 14 x 3).
- Tolkance sur I’alhsage
Tableau 1 : Erreur d’inclinaison des g oujures isans
Epreuve 7
PPort
I’epreuve 14).
c
Qualit de fraises-m&es
AA A B C
Tolerance1 ) H5 H5 H6 H6 Epreuve 8 : Erreur de profil de I’arete coupante (epreuve 14/2).
1) Conforme 3 I’ISO 286.
Epreuve 8A : Erreur de profil de I’arete coupante (epreuve
14/ 1). Voir les notes au bas du tableau 2.
Les alesages normalises doivent etre rectifiees rectilignes et
paralleles, dans la tolerance donnee au tableau 1, et ce sur
Epreuve 9 : Erreur sur I’epaisseur de dent (epreuve 14 x 2,241.
75 % de leur longueur portante pour les fraises-meres de qua-
lite AA-A et B, et sur 50 % de leur longueur portante pour les
: Erreur sur la saillie de la dent (epreuve 14 x
Epreuve 9A*
fraises-meres de qualite C.
3,151.
Pour verifier I’alignement de I’alesage on utilisera un mandrin de
Epreuve IO : Erreur individuelle de pas helicoi’dal (epreuve
reference, de diametre egal au diametre nominal de cet alesage,
14/2,24).
et qui devra pouvoir traverser de part en part ce dernier.
Epreuve 11 : Erreur cumulee de pas helicoi’dal (erreur cyclique)
(epreuve 14/ 1,251.
Epreuve 1 IA : Erreur cumulee de pas helico’idal sur une revolu-
tion (erreur cyclique) (epreuve 14/l ,121. Voir les notes au bas
du tableau 2.
Epreuve 12 : Erreur cumulee de pas helicoi’dal sur trois revolu-
tions (epreuve 14 x 1,4).
ipreuve 13 : Erreur individuelle sur I’entredent mesure sur la
ligne d’action (epreuve. 14/2,24).
4.1 Cl6 du tableau 2
Epreuve 14 : Erreur cumulee sur I’entredent mesure le long de la
La valeur de reference pour chaque epreuve est celle de la qua-
ligne d’action.
lite A, pour les modules > 16 a 25. Ces valeurs ont ete determi-
nees a partir de la valeur de base de I’epreuve 14, egale a 45 pm Valeur de base : 45 pm pour les fraises-meres de qualite A et de
module > 16 8 25.
et sur base des rapports specifies ci-apres.
* Les tolcirances SW la saillie de la dent, kpreuve 9A, sont fonction de I’epaisseur de la dent pour les fraises-m&es ayant un angle de pression de 20°,
de telle sorte que :
tokrance sur I’epaisseur
Tokance sur la saillie =
2 x tangente de I’angle de pression (20’)
= 1,374 x tolhance sur I’epaisseur de dent
La valeur 1,374 a bte arrondie au nombre normal 1,4.
2
---------------------- Page: 4 ----------------------
- Dimensions metriques
Tableau 2 - Tolkances
NOTE - Les epreuves 1 3 14 peuvent etre rhalishes dans n’importe quel ordre.
TolQrances
Objet de
Schema
ipreuve no il6ment contr6l4
Mpreuve
Clm
Pas exprime en
Qualitb
r
module
m AA A B C
1 a2 5 7 7
{ 1,12
Battement radial
> 2 A 3,5 5 8 8
Surfaces de rkf&
( 13
de la collerette
6 10 IO
> 3,5 B 6,3
1 rence des colle-
( I,25
de centrage
> 6,3 in 10 8 12 12
rettes de centrage
( 1~32
10 16 16
> 10 8 16
{ X4
> 16 525 14 22 22
( I,5
25 8 40 21 34 34
>
2 4 6 6
122
> 2 8 3,5 3 4 6 6
> 3,5 ZI 6,3 3 5 8 8
Surfaces de rbf&
Battement axial
> 6,3 B 10 4 6 IO IO
rence des colle-
de la collerette
> IO A 16 5 8 12 12
rettes de centrage
de centrage
7
> 16 225 11 18 18
11 17 26 26
> 25 5 40
182 14 22 40 80
16 25 45 90
> 2 a 3,5
> 3,5 5 6,3 19 30 53 105
Battement radial
> 6,3 8 IO 24 38 65 130
du sommet
Diamktre de tgte
> 10 ii 16 32 50 90 180
des dents
> 16 325 45 70 125 250
> 25 8 40 65 105 190 380
182
11 18 32 32
> 2 iI 3,5 12 20 36 36
Rectitude et
> 3,5 B 6,3 15 24 42 42
alignement radial
Faces de coupe
> 6,3 2 10 19 30 53 53
sur profondeur
des gouju res
> 10 3 16 25 40 70 70
de coupe
> 16 $25
36 55 loo loo
> 25 B 40
53 85 150 150
---------------------- Page: 5 ----------------------
Dimensions metriques (suite)
Tableau 2 - Tokrances -
Objet de To krances
ipreuve no Elkment contriY6 SchQma
Mpreuve
w
Pas exprimk en
halite
r
module
m AA A B
kartement entre
1 A2 14 22 40 40
Faces de coupe
deux goujures
> 2 a 3,5 16 25 45 45
des goujures
successives
> 3,5 B 6,3 19 30 53 53
123
> 24 38 65 65
6,3 A 10
> 10 8 16 32 50 90 90
> 16 B25
...
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