SIST EN 586-3:2004
(Main)Aluminium and aluminium alloys - Forgings - Part 3: Tolerances on dimensions and form
Aluminium and aluminium alloys - Forgings - Part 3: Tolerances on dimensions and form
This European Standard specifies the tolerances on dimensions and form of aluminium and aluminium alloy forgings for general engineering applications of usual design concepts which are formed hot.
It applies to :
3 die forgings without machining all over :
shape dimensions nmax L 2 000 mm, die closure dimensions tmax L 600 mm and projected area A L 4 000 cm2;
die forgings with machining all over :
shape dimensions nmax L 6 000 mm and projected area A L 22 000 cm2;
3 hand forgings :
profile dimensions nmax L 8 000 mm.
Tolerances on forgings outside the scope of this standard or of complex design can be mutually agreed between supplier and purchaser.
Design guidelines for die and hand forgings are given in annex A.
NOTE Some of the products mentioned in this European Standard may be the subject of patent or patent applications, and their listing herein is not to be construed in any way as the granting of a licence under such patent right.
CEN/TC 132 affirms it is its policy that in the case when a patentee refuses to grant licenses on standardized standards products under resonable and non discriminatory conditions then this product should be removed from the corresponding standard.
Aluminium und Aluminiumlegierungen - Schmiedestücke - Teil 3: Grenzabmaße und Formtoleranzen
Diese Europäische Norm legt die Grenzabmaße und Formtoleranzen für warmgeformte Schmiedestücke aus Aluminium und Aluminiumlegierungen üblicher Formgebung für allgemeine technische Anwendungen fest.
Sie gilt für:
3 Gesenkschmiedestücke ohne allseitige Bearbeitung:
formgebundene Maße nmax L 2 000 mm,
nichtformgebundene Maße tmax L 600 mm und projizierte Fläche A L 4 000 cm2;
3 Gesenkschmiedestücke mit allseitiger Bearbeitung:
formgebundene Maße nmax L 6 000 mm und projizierte Fläche A L 22 000 cm2;
3 Freiformschmiedestücke:
Profilmaße nmax L 8 000 mm.
Toleranzen für Schmiedestücke, die außerhalb des Anwendungsbereiches dieser Norm liegen oder eine komplizierte Formgebung aufweisen, können zwischen Lieferer und Käufer vereinbart werden.
Konstruktionsrichtlinien für Gesenk- und Freiformschmiedestücke sind im Anhang A angegeben.
ANMERKUNG Einige in der vorliegenden Norm aufgeführte Produkte können Gegenstand von einem Patent oder Patentanmeldungen sein. Ihre Auflistung in dieser Norm bedeutet aber keinesfalls, dass dadurch eine Lizenzübertragung unter diesem Patentrecht erfolgt.
CEN/TC 132 bekräftigt seine Vorgehensweise, dass in dem Fall, wenn ein Patentinhaber sich weigert, für genormte Erzeug-nisse Lizenzen unter angemessenen und nicht diskriminierenden Bedingungen zu erteilen, dieses Erzeugnis aus der ent-sprechenden Norm entfernt werden sollte.
Aluminium et alliages d'aluminium - Pieces forgées - Partie 3: Tolérances sur dimensions et forme
Cette norme européenne spécifie les tolérances sur dimensions et forme des pieces forgées en aluminium et alliages d'aluminium pour applications mécaniques générales, de conception usuelle formée a chaud.
Elle s'applique aux :
3 pieces matricées sans usinage complet :
dimensions nominales nmax L 2 000 mm, dimensions de fermeture des matrices tmax L 600 mm et aire projetée A L 4 000 cm2 ;
3 pieces matricées completement usinées :
dimensions nominales nmax L 6 000 mm, et aire projetée A L 22 000 cm2 ;
3 pieces obtenues par forgeage libre :
dimension de profilé nmax L 8 000 mm.
Les tolérances des pieces forgées qui se situent en dehors du domaine d'application de cette norme ou qui sont de conception complexe peuvent etre convenues par accord mutuel entre le fournisseur et l'acheteur.
Les directives de conception des pieces matricées ou forgeage libre sont données dans l'annexe A.
NOTE Des matériaux cités dans la présente norme peuvent faire l'objet de brevet ou de demandes de brevets, et leur inclusion dans la présente norme ne doit etre en aucune façon considérée comme l'attribution d'une licence au regard des droits attachés a de tels brevets.
Le CEN/TC 132 confirme que dans le cas ou le détenteur d'un brevet refuse de céder des licences sur les produits normalisés sous des conditions raisonnables et non discriminatoires, alors ce produit serait éliminé de la norme correspondante.
Aluminij in aluminijeve zlitine – Izkovki – 3. del: Odstopki mer in tolerance oblik
General Information
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 586-3:2004
01-januar-2004
Aluminij in aluminijeve zlitine – Izkovki – 3. del: Odstopki mer in tolerance oblik
Aluminium and aluminium alloys - Forgings - Part 3: Tolerances on dimensions and form
Aluminium und Aluminiumlegierungen - Schmiedestücke - Teil 3: Grenzabmaße und
Formtoleranzen
Aluminium et alliages d'aluminium - Pieces forgées - Partie 3: Tolérances sur dimensions
et forme
Ta slovenski standard je istoveten z: EN 586-3:2001
ICS:
77.150.10 Aluminijski izdelki Aluminium products
SIST EN 586-3:2004 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 586-3:2004
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SIST EN 586-3:2004
EUROPEAN STANDARD
EN 586-3
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2001
ICS 77.150.10
English version
Aluminium and aluminium alloys - Forgings - Part 3: Tolerances
on dimensions and form
Aluminium et alliages d'aluminium - Pièces forgées - Partie Aluminium und Aluminiumlegierungen - Schmiedestücke -
3: Tolérances sur dimensions et forme Teil 3: Grenzabmaße und Formtoleranzen
This European Standard was approved by CEN on 30 September 2001.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the official
versions.
CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,
Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36 B-1050 Brussels
© 2001 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 586-3:2001 E
worldwide for CEN national Members.
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Contents
Foreword.3
1 Scope .4
2 Normative references .4
3 Terms and definitions.5
4 Identification of symbols.6
5 General requirements.7
5.1 Technical conditions for inspection and delivery .7
5.2 Application of tolerances.7
5.3 Summarised references .7
5.4 Chemical composition.8
5.5 Alloy groups .8
6 Tolerances on dimensions and form .10
6.1 Die forgings .10
6.2 Hand forgings.25
Annex A (informative) Design guidelines for die and hand forgings.30
Bibliography .56
2
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Foreword
This European Standard has been prepared by Technical Committee CEN /TC 132, "Aluminium and aluminium
alloys", the secretariat of which is held by AFNOR.
This European Standard shall be given the status of a national standard, either by publication of an identical text or
by endorsement, at the latest by April 2002, and conflicting national standards shall be withdrawn at the latest by
April 2002.
Within its programme of work, Technical Committee CEN/TC 132 entrusted CEN/TC 132/WG3 “Forgings and cast
and wrought forging stock” to prepare the following standard :
EN 586-3, Aluminium and aluminium alloys - Forgings - Part 3 : Tolerances on dimensions and form’
This standard is part of a set of three standards. The other standards deal with :
EN 586-1, Aluminium and aluminium alloys - Forgings - Part 1 : Technical conditions for inspection and
delivery
EN 586-2, Aluminium and aluminium alloys - Forgings - Part 2 : Mechanical properties and additional
properties
Annex A is informative.
This standard includes a Bibliography.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Czech Republic, Denmark, Finland,
France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden,
Switzerland and the United Kingdom.
3
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SIST EN 586-3:2004
EN 586-3:2001 (E)
1 Scope
This European Standard specifies the tolerances on dimensions and form of aluminium and aluminium alloy
forgings for general engineering applications of usual design concepts which are formed hot.
It applies to :
die forgings without machining all over :
shape dimensions n 2 000 mm, die closure dimensions t 600 mm and projected area A 4 000 cm²;
max max
die forgings with machining all over :
shape dimensions n 6 000 mm and projected area A 22 000 cm²;
max
hand forgings :
profile dimensions n 8 000 mm.
max
Tolerances on forgings outside the scope of this standard or of complex design can be mutually agreed between
supplier and purchaser.
Design guidelines for die and hand forgings are given in annex A.
NOTE Some of the products mentioned in this European Standard may be the subject of patent or patent applications, and
their listing herein is not to be construed in any way as the granting of a licence under such patent right.
CEN/TC 132 affirms it is its policy that in the case when a patentee refuses to grant licenses on standardized standards
products under resonable and non discriminatory conditions then this product should be removed from the corresponding
standard.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications. These
normative references are cited at the appropriate places in the text, and the publications are listed hereafter. For
dated references, subsequent amendments to or revisions of any of these publications apply to this European
Standard only when incorporated in it by amendment or revision. For undated references the latest edition of the
publication referred to applies (including amendments).
EN 573-3, Aluminium and aluminium alloys - Chemical composition and form of wrought products -
Part 3 : Chemical composition.
EN 573-4, Aluminium and aluminium alloys - Chemical composition and form of wrought products - Part 4 : Form of
products.
EN 586-1, Aluminium and aluminium alloys - Forgings - Part 1 : Technical conditions for inspection and delivery.
EN 586-2, Aluminium and aluminium alloys - Forgings - Part 2 : Mechanical properties and additional property
requirements.
EN 12258-1, Aluminium and aluminium alloys - Terms and definitions - Part 1 : General terms.
4
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SIST EN 586-3:2004
EN 586-3:2001 (E)
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 12258-1 and the following apply.
3.1
die forgings without machining all over
parts entering service use whilst still retaining forged surfaces
3.2
die forgings with machining all over
parts entering service use after removal of all forged surfaces by machining
3.3
shape dimensions
dimensions associated with the shape length, width and height dimensions, including diameters and distances
between centre axes, situated within the shape impression on the parts of the die set, designated n, see Figure1
Key
1 Upper die
2 Lower die
3 Parting line
4 Direction of forging
Figure 1 - Shape dimensions n (die forgings)
3.4
die closure dimensions
dimensions dissociated with the shape dimensions which cross the die parting line, measured perpendicular to the
predominant mating surface, designated t, see Figure2
5
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Key
1 Upper die
2 Lower die
3 Parting line
4 Direction of forging
Figure 2 - Die closure dimensions t (die forgings)
3.5
projected area
area of the part viewed in the direction of forging, designated A, conventionally taken as :
the area of a circle when the projection is a circle ;
the area of a circumscribing rectangle in all other cases, see Figure3.
NOTE Projected area is expressed in square centimetres.
Key
1 Parting line
2 Direction of forging
Figure 3 - Calculation of projected area A (die forgings)
4 Identification of symbols
The following symbols have been adopted for use in this standard :
n is shape dimension
6
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SIST EN 586-3:2004
EN 586-3:2001 (E)
n is maximum shape dimension
max
t is thickness and/or die closure dimension
t is maximum thickness/maximum die closure dimension
max
A is projected area in square centimetres
m is mismatch (offset)
x is fin height
y is fin width
f is flatness (plus/minus tolerance)
s is flatness or straightness (plus only tolerance)
p is profile tolerance (hand forgings)
c is constant thickness tolerance (hand forgings)
h is height of rib, flange or bead
d is diameter of indentations
F is flash type
R is rounding/radius
ß is inboard draft angle
D is die closure tolerance
t
M is mismatch tolerance
t
5 General requirements
5.1 Technical conditions for inspection and delivery
Technical conditions for inspection and delivery of forgings are specified in EN 586-1.
5.2 Application of tolerances
The dimensional tolerances specified on drawings shall, in principle, conform to those laid down in this standard. If
no dimensional tolerances are specified on drawings, those given in this standard shall apply. In such cases it is
recommended that a suitable reference to this standard be made on drawings. If the purchaser requires tolerances
on individual dimensions tighter than those laid down in this standard, these shall be agreed with the supplier.
5.3 Summarised references
A summary of references to the applicable subclauses and tables covering the different types of characteristics
together with the basis on which tolerances are calculated is given in Table 1.
7
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Table 1 – Summarised references
Characteristic Subclause Base Table reference
Die forgings 6.1
Die forgings without machining all over 6.1.2
Shape dimensions 6.1.2.2 n Table 3, Table 4
Die closure dimensions 6.1.2.4 t and A Table 5
max
Die forgings with machining all over 6.1.3
Shape dimensions 6.1.3.2 n Table 6
Die closure dimensions 6.1.3.4 n and A Table 7
max
Mismatch (offset) 6.1.4
Die forgings without machining all over 6.1.4.2 n Table 8
max
Die forgings with machining all over 6.1.4.3 n Table 9
max
Flash and fin projections 6.1.5 n Table 10, Table 11
max
R nominal
Roundings and transitions 6.1.6
A
Ejector marks 6.1.7 Table 12
Flatness and straightness 6.1.8 n Table 13
max
Angles 6.1.9 n Table 14
1
Hand forgings 6.2
Profile dimensions 6.2.2 n and t Table 15
max max
Flatness and straightness 6.2.3 n Table 16
max
5.4 Chemical composition
The chemical composition limits of the alloys shall be as specified in EN 573-3.
5.5 Alloy groups
For the purposes of this European Standard alloys are divided into two groups dependent on their shaping
capability. The division into Group I and Group II of these alloys is specified in Table 2.
8
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EN 586-3:2001 (E)
The division into Class A and Class B alloys shall be as specified in EN 573-4. Class A covers aluminium and
aluminium alloys produced in large volume as forgings for which mechanical properties are specified in EN 586-2.
Class B covers aluminium and aluminium alloys produced in limited volume as forgings for which mechanical
properties are not specified.
Table 2 - Alloy Groups
Alloy Group I (forge with ease) Alloy Group II (difficult to forge)
Alloy designation Class Alloy designation Class
EN AW-1050A [AI 99,5] B EN AW-2011 [AI Cu6BiPb] B
EN AW-2014 [AI Cu4SiMg] A
EN AW-6005A [AI SiMg (A)] B EN AW-2017A [AI Cu4MgSi(A)] B
EN AW-2618A [AI Cu2Mg1,5Ni] B
EN AW-6060 [AI MgSi] B EN AW-2219 [AI Cu6Mn] B
EN AW-2024 [AI Cu4Mg1] A
EN AW-6061 [AI Mg1SiCu] B EN AW-2031 [AI Cu2,5NiMg] B
EN AW-4032 [AI Si12,5MgCuNi] B
EN AW-6082 [AI Si1MgMn] A EN AW-5454 [AI Mg3Mn] B
EN AW-5754 [AI Mg3] A
EN AW-5019 [AI Mg5] B
EN AW-5083 [AI Mg4,5Mn0, 7] A
EN AW-7010 [AI Zn6MgCu] B
EN AW-7012 [AI Zn6Mg2Cu] B
EN AW-7020 [AI Zn4,5Mg1] B
EN AW-7075 [AI Zn5,5MgCu] A
Other alloys shall be grouped as follows :
Alloy Group I
unalloyed aluminium ;
alloys Al Mn ;
alloys Al Mg with a maximum of 2,8 % Mg ;
alloys Al MgSi ;
Alloy Group II :
alloys Al Mg with more than 2,8% Mg ;
alloys Al CuMg ;
alloys Al ZnMg.
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EN 586-3:2001 (E)
6 Tolerances on dimensions and form
6.1 Die forgings
6.1.1 General
Dimensional variations are influenced by the fabrication accuracy of the dies, tool wear, shrinkage and the
unavoidable deviations caused during the shaping process as well as during heat treatment.
The different forging applications necessitate different dimensional tolerance levels for die forgings with and without
machining all over. Likewise, tolerances applied to shape dimensions n are different to those applied to die closure
dimensions t.
When specifying dimensions, due consideration shall be given to the accumulation of tolerances, see A.1.13,
A.1.14 and Figure5.
6.1.2 Forgings without machining all over
6.1.2.1 General
Shape dimensions n and die closure dimensions t for die forgings without machining all over are shown in Figure 4.
Key
1 Parting line
2 Direction of forging
Figure 4 - Shape dimensions n and die closure dimensions t for die forgings without machining all over
6.1.2.2 Shape dimensions
The tolerances on shape dimensions n for forgings of a size which fits within a sphere of 120 mm diameter shall be
as specified in Table 3 and for a size greater than that which fits within a sphere of 120 mm diameter shall be as
specified in Table 4.
If the purchaser requires a given dimension to be governed by a wholly plus or a wholly minus tolerance the
tolerance range stated in Tables 3 and 4 shall apply.
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EXAMPLE According to Table 3 the tolerance for the nominal dimension of 8 mm is 0,25 mm. If the dimension is to be
0,5 0
governed by a wholly plus or a wholly minus tolerance this would apply as mm or mm respectively.
0 0,5
Table 3 - Tolerances on shape dimensions for forgings without machining all over
which fit within a sphere of 120 mm diameter
Dimensions in millimetres
Nominal dimension n Tolerances on dimension
Over Up to and including n
-6 0,2
610
0,25
10 18
0,3
18 30 0,35
30 50
0,4
50 80
0,55
80 120
0,7
Table 4 - Tolerances on shape dimensions for forgings without machining all over of a size greater than
that which fits within a sphere of 120 mm diameter
Dimensions in millimetres
Nominal dimension n Tolerances on dimension
Over Up to and including n
50
0,5
50 80
0,65
80 120 0,8
120 180
0,9
180 250
1,0
250 315
1,2
315 400 1,3
400 500
1,5
500 630
1,7
630 800
2,0
800 1 000 2,3
1 000 2 000
2,5
6.1.2.3 Application of tolerances to forgings without machining all over having one plain die half
The tolerances given in Tables 3 and 4 shall apply also to forgings without machining all over produced from a
recessed bottom die in conjunction with a plain top die.
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EN 586-3:2001 (E)
6.1.2.4 Die closure dimensions
The tolerances on die closure, dimensions t, shall be as specified in Table 5.
The bases for establishing such tolerances shall be the largest overall dimension in the direction of forging t and
max
the projected area A.
All other dimensions t in the direction of forging shall carry the same tolerance as t
.
max
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Table 5 - Tolerances on die closure dimensions for forgings without machining all over
Nominal closure Projected area A in square centimetres (cm²)
dimension
t Up to 25 Over 25 Over 50 Over Over Over Over Over Over
max
to 50 to 100 100 200 400 800 1 200 to 2 000 to
(mm)
to 200 to 400 to 800 to 1 200 2 000 4 000
Over Up to and Tolerances for die closure dimensions t (mm)
including
3+ 0,3 -- --- ---
- 0,15
3 6 + 0,35 + 0,35 + 0,45 + 0,7 -- ---
- 0,2 - 0,3 - 0,3 - 0,5
6 10 + 0,35 + 0,5 + 0,5 + 0,8 + 1,0 + 1,1 ---
- 0,3 - 0,3 - 0,35 - 0,5 - 0,6 - 0,7
10 18 + 0,45 + 0,5 + 0,6 + 0,9 + 1,1 + 1,2 + 1,3 + 1,4 + 1,5
- 0,3 - 0,35 - 0,45 - 0,6 - 0,7 - 0,8 - 0,8 - 0,9 - 1,0
18 30 + 0,5 + 0,6 + 0,7 + 1,0 + 1,2 + 1,3 + 1,4 + 1,6 + 1,6
- 0,35 - 0,45 - 0,45 - 0,7 - 0,8 - 0,9 - 0,9 - 1,0 - 1,1
30 50 + 0,5 + 0,7 + 0,8 + 1,1 + 1,3 + 1,4 + 1,5 + 1,7 + 1,7
- 0,45 - 0,45 - 0,5 - 0,8 - 0,9 - 1,0 - 1,0 - 1,1 - 1,2
50 80 + 0,7 + 0,8 + 0,85 + 1,3 + 1,4 + 1,6 + 1,7 + 1,8 + 1,9
- 0,45 - 0,5 - 0,6 - 0,9 - 1,0 - 1,0 - 1,1 - 1,2 - 1,2
80 120 + 0,8 + 0,9 + 1,0 + 1,4 + 1,6 + 1,7 + 1,8 + 1,9 + 2,0
- 0,6 - 0,6 - 0,85 - 1,0 - 1,0 - 1,2 - 1,2 - 1,3 - 1,4
120 180 + 1,3 + 1,4 + 1,5 + 1,6 + 1,7 + 1,9 + 1,9 + 2,1 + 2,2
- 0,9 - 1,0 - 1,0 - 1,1 - 1,2 - 1,2 - 1,3 - 1,4 - 1,4
180 250 + 1,6 + 1,6 + 1,7 + 1,8 + 1,9 + 2,0 + 2,1 + 2,2 + 2,3
- 1,0 - 1,1 - 1,2 - 1,2 - 1,3 - 1,3 - 1,4 - 1,4 - 1,5
250 315 - + 1,9 + 1,9 + 2,0 + 2,0 + 2,2 + 2,2 + 2,3 + 2,3
- 1,2 - 1,3 - 1,3 - 1,4 - 1,4 - 1,5 - 1,5 - 1,6
315 400 - - + 2,0 + 2,1 + 2,2 + 2,2 + 2,3 + 2,3 + 2,4
- 1,4 - 1,4 - 1,4 - 1,5 - 1,5 - 1,6 - 1,6
400 500 - - - - - + 2,3 + 2,4 + 2,5 + 2,5
- 1,6 - 1,6 - 1,6 - 1,6
500 600 - - - - - - + 2,5 + 2,5 + 2,5
- 1,6 - 1,7 - 1,7
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6.1.3 Forgings with machining all over
6.1.3.1 General
Shape dimensions n and die closure dimensions t for die forgings with machining all over are shown in Figure5.
Key
1 Machined part
2 Machining allowance
3 Tooling allowance
4 Straightness allowance
5 ½ negative die closure allowance
6 Shrinkage allowance
7 Mismatch allowance
8 Forging profile
9 Direction of forging
n t
Figure 5 - Shape dimensions , die closure dimensions and
accumulation of tolerances for die forgings with machining all over
6.1.3.2 Shape dimensions
The tolerances on shape dimensions n for all forgings with machining all over shall be as specified in Table 6.
If the purchaser requires a given dimension to be governed by a wholly plus or a wholly minus tolerance the
tolerance range stated in Table 6 shall apply.
EXAMPLE According to Table 6 the tolerance for the nominal dimension of 150 mm is 1,2 mm. If the dimension is to be
2,4
0
governed by a wholly plus or a wholly minus tolerance this would apply as mm or mm respectively.
0 2,4
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Table 6 - Tolerances on shape dimensions for forgings with machining all over
Dimensions in millimetres
Nominal dimension n Tolerances on dimension
Over Up to and including n
- 100
1,0
100 160 1,2
160 250
1,4
250 400
1,6
400 630
1,9
630 1 000 2,4
1 000 1 600
3,2
1 600 2 500
4,5
2 500 4 000
6,0
4 000 6 000 8,0
6.1.3.3 Application of tolerances to die forgings with machining all over having one plain die half
The tolerances given in Table 6 shall apply also to forgings produced from a recessed bottom die in conjunction
with a plain top die.
6.1.3.4 Die closure dimensions
The tolerances on die closure, dimensions t, shall be as specified in Table 7.
The bases for establishing such tolerances shall be the largest overall dimension when viewed in the direction of
forging n and the projected area A.
max
All dimensions t in the direction of forging shall carry the same tolerance.
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Table 7 — Tolerances on die closure dimensions for forgings with machining all over
Maximum shape Projected area A in square centimetres (cm²)
dimension of forging
n
Up to 60 Over 60 Over 100 Over 160 Over 250 Over 400 Over 630 Over 1 000 Over 1 600 Over 2 500 Over 4 000 Over 6 300 Over 10 000 Over 16 000
max
to 100 to 160 to 250 to 400 to 630 to 1 000 to 1 600 to 2 500 to 4 000 to 6 300 to 10 000 to 16 000 to 22 000
(mm)
Over Up to and Tolerances on die closure dimensions t
including (mm)
100 + 1,0 + 1,1 + 1,7
-- --- --- ---
- 1,0 - 1, 0 - 1,0
100 160 + 1,4 + 1,5 + 1,6 + 1,7
- --- --- ---
- 1,0 - 1,0 - 1,0 - 1,0
160 250 + 1,7 + 1,8 + 1,9 + 2,0 + 2,1 + 2,2 + 2,5 + 2,7 + 3,2
- - ---
- 1,0 - 1,0 - 1,0 - 1,0 - 1,1 - 1,2 - 1,2 - 1,5 - 1,5
250 400 + 2,0 + 2,1 + 2,2 + 2,3 + 2,4 + 2,5 + 2,7 + 3,2 + 3,5
- - ---
- 1,0 - 1,1 - 1,2 - 1,3 - 1,4 - 1,5 - 1,5 - 1,5 - 1,5
400 630 + 2,4 + 2,5 + 2,6 + 2,7 + 2,8 + 3,0 + 3,2 + 3,5 + 3,7
-- ---
- 1,4 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5
630 1 000 + 2,8 + 2,9 + 3,0 + 3,1 + 3,3 + 3,5 + 3,7 + 3,9
-- - ---
- 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5
1 000 1 600 + 3,2 + 3,3 + 3,4 + 3,6 + 3,8 + 4,0 + 4,2 + 4,4 + 4,8 + 5,2
-- --
- 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5 - 1,5
1 600 2 500 + 3,6 + 3,7 + 3,8 + 4,0 + 4,2 + 4,4 + 4,8 + 5,2 + 5,4
-- ---
- 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0
2 500 4 000 + 4,0 + 4,1 + 4,3 + 4,5 + 4,7 + 5,2 + 5,8 + 6,3
-- --- -
- 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0
4 000 6 000 + 4,4 + 4,6 + 4,8 + 5,0 + 5,6 + 6,5 + 7,5
-- --- --
- 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0 - 2,0
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SIST EN 586-3:2004
EN 586-3:2001 (E)
6.1.4 Mismatch (offset)
6.1.4.1 General
Mismatch (offset) is the distance m between a given point in that part of the forging on one side of the parting plane
and the corresponding point on the opposite side. Measurement shall be taken as shown in Figure 6.
Intended construction Mismatch (offset)
Key
1 Longitudinal mismatch (offset)
2 Transverse mismatch (offset)
Figure 6 - Mismatch (offset)
The tolerance for mismatch (offset) is independent of other dimensional tolerances and shall be applied separately.
The basis for establishing such tolerances shall be the overall dimension of the forging n viewed in the direction
max
of forging (see Figures 4 and 5).
6.1.4.2 Forgings without machining all over
The mismatch (offset) tolerances on forgings without machining all over shall be as specified in Table 8.
For wall thickness the mismatch (offset) tolerances shall be based on the largest nominal thickness and inboard
draft angle ß (see Figure 7).
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Dimensions in millimetres
Key
1 Nominal wall thickness
2 Projected area = 120 cm²
3 Example wall thickness mismatch (offset)
Figure 7 - Wall thickness mismatch (offset) for forgings without machining all over
Table 8 - Tolerances on mismatch (offset) for forgings without machining all over
Dimensions in millimetres
Nominal dimension n Up to Over 50 Over 120 Over 315 Over 600 Over 1 000
max
50 to 120 to 315 to 600 to 1 000 to 2 000
Mismatch (offset) tolerance M 0,3 0,4 0,6 0,8 1,0 1,4
t
The mismatch (offset) tolerance for wall thickness of forgings without machining all over shall be determined using
the following formula :
mismatch (offset) tolerance for wall thickness = D tan M .
t t
where
D is the die closure tolerance according to Table 5 when t is taken as the nominal wall thickness and
t
max
projected area A = n x n (see Figure 3),
1 2
is the inboard draft angle, and
M is the mismatch (offset) tolerance according to Table 8 where n is taken as the nominal wall thickness.
t
max
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SIST EN 586-3:2004
EN 586-3:2001 (E)
EXAMPLE
Projected area A = 120 cm²
nominal wall thickness = 8 mm
inboard draft angle ß = 10° (tan ß = 0,176 3)
Applying the formula :
For Plus tolerance : [D = + 0,8 mm ; M = + 0,3 mm] = (+ 0,8 mm 0,176 3) + 0,3 mm = + 0,44 mm
t t
for Minus tolerance : [D = - 0,5 mm ; M = - 0,3 mm] = (- 0,5 mm 0,176 3) - 0,3 mm = - 0,39 mm
t t
0,45
Mismatch (offset) tolerance for wall thickness (rounded to nearest 0,05) = mm
0,40
6.1.4.3 Forgings with machining all over
The mismatch (offset) tolerances on forgings with machining all over shall be as specified in Table 9.
Table 9 - Tolerances on mismatch (offset) for forgings with machining all over
Dimensions in millimetres
Nominal dimension n
Up to 250 Over 250 Over 400 Over 630 Over 1 000 Over 1 600 Over 2 500 Over 4 000
max
to 400 to 630 to 1 000 to 1 600 to 2 500 to 4 000 to 6 000
Mismatch (offset) M
0,8 1,0 1,2 1,5 1,8 2,1 2,5 3,0
t
6.1.5 Flash and fin projections
6.1.5.1 General
Flashes are formed by metal extruding between the mating surfaces of the dies and are either cut off by
mechanical means or removed using hand tools. Tolerances for the residual flash projections (see Figure 8) shall
be as specified in Table 10.
The fin or burr formed on the outline of certain forgings during the forming and fettling operations, notably near to
the mating surfaces of the dies, known as stamping, fettling or infiltration fins shall also be similarly restricted.
Tolerances for fin projections (see Figure 9) shall be as specified in Table 11.
6.1.5.2 Flash projections
Tolerances for flash projections shall be as specified in Table 10.
Flash projections shall be measured as shown in Figure8.
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Key
1 Flash projection
2 Theoretical point
3 Direction of forging
Figure 8 — Measurement of flash projections
Table 10 - Tolerances on flash projections
Dimensions in millimetres
Nominal dimension Up to Over Over Over 315 Over 600 Over Over Over
n 50 50 120 to 600 to 1 200 1 200 2 000 3 000
max
to 120 to 315 to 2 000 to 3 000 to 6 000
Flash projection + 0,4 + 0,6 + 1,0 + 1,8 + 2,5 + 3,0 + 3,5 + 4,0
6.1.5.3 Fin projections
Tolerances for fin projections shall be as specified in Table 11.
Fin projections, defined by height x and width y, shall be measured as shown in Figure 9.
Key
1 Infiltration fin
2 Fettling fin
3 Stamping fin
Figure 9 - Measurement of fin projections
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Table 11 - Tolerances for fin projections
Dimensions in millimetres
Nominal dimension Up to 120 Over 120 to 315 Over 315 Over 600 to 6 000
to 600
n
max
Height x 1,0 1,6 2,5 4,0
Width y 0,8 1,2 1,6 2,0
6.1.6 Roundings and transitions
Roundings and transitions (see Figure 10) are required to facilitate forging (see also A.1.10).
Key
1 Transition bend (fillet radius)
2 Rounded edge (corner radius)
Figure 10 - Roundings and transitions
Tolerance for roundings and transitions shall be +10 % of the nominal radius dimension but not less than 1 mm.
6.1.7 Ejector marks
Ejector marks are areas on the forging’s surface, either recessed or raised, residual from ejectors included in the
dies to facilitate release of the part (see Figure 11).
Tolerances for ejector marks shall be as specified in Table 12. The basic dimension for establishing such
tolerances shall be the projected area A (see Figure 3).
The diameter and location of ejector marks shall be agreed between supplier and purchaser.
Tolerances for ejector marks are independent of other dimensional tolerances and shall be applied separately.
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SIST EN 586-3:2004
EN 586-3:2001 (E)
Key
1 Ejector mark (recessed)
2 Ejector mark (raised)
Figure 11 - Ejector marks
Table 12 - Tolerances on ejector marks
Projected Area Up
...
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