EN ISO 7285:2021

SLOVENSKI STANDARD
01-marec-2021
Pnevmatski cilindri za mehanizirano večtočkovno varjenje (ISO 7285:1995)
Pneumatic cylinders for mechanized multiple spot welding (ISO 7285:1995)
Pneumatik-Schweißzylinder für Vielpunktschweißeinrichtungen (ISO 7285:1995)
Vérins pneumatiques pour soudage multipoints mécanisés (ISO 7285:1995)
Ta slovenski standard je istoveten z: EN ISO 7285:2021
ICS:
25.160.30 Varilna oprema Welding equipment
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN ISO 7285
EUROPEAN STANDARD
NORME EUROPÉENNE
January 2021
EUROPÄISCHE NORM
ICS 25.160.30
English Version
Pneumatic cylinders for mechanized multiple spot welding
(ISO 7285:1995)
Vérins pneumatiques pour soudage multipoints Pneumatik-Schweißzylinder für
mécanisés (ISO 7285:1995) Vielpunktschweißeinrichtungen (ISO 7285:1995)
This European Standard was approved by CEN on 6 December 2020.

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 CEN-CENELEC 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 CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,
Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2021 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 7285:2021 E
worldwide for CEN national Members.

Contents Page
European foreword . 3

European foreword
The text of ISO 7285:1995 has been prepared by Technical Committee ISO/TC "Welding and allied
processes” of the International Organization for Standardization (ISO) and has been taken over as
of which is held by DIN.
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 July 2021, and conflicting national standards shall be
withdrawn at the latest by July 2021.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
According to the CEN-CENELEC Internal Regulations, the national standards organizations of the
following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,
Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,
Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of
North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the
United Kingdom.
Endorsement notice
The text of ISO 7285:1995 has been approved by CEN as EN ISO 7285:2021 without any modification.

INTERNATIONAL
ISO
STANDARD
First edition
1995-12-01
Pneumatic cylinders for mechanized
multiple spot welding
V&ins Pneuma tiques pour soudage multipoin ts m&an&
Reference number
ISO 7285: 1995(E)
ISO 7285:1995(E)
Contents
Page
1 Scope . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2 Normative reference
. . . . . . . . . . . . . . . . .I.
3 Nominal characteristics
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .*.
4 Fixing the cylinder
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6 Operating specifications
7 Construction .
........... 2
Marking .
Delivery conditions .
10 Inspection and type tests . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Annexes
I. 7
Methods of mounting the cylinders
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B Electrode holder attachment
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
C Mounting methods - Dimensions
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
D Bibliography
0 ISO 1995
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced
or utilized in any form or by any means, electronie or mechanical, including photocopying and
microfilm, without Permission in writing from the publisher.
International Organization for Standardization
Case Postale 56 l CH-l 211 Geneve 20 l Switzerland
Printed in Switzerland
0 ISO
ISO 7285: 1995(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide
federation of national Standards bodies (ISO member bodies). The work
of preparing International Standards is normally carried out through ISO
technical committees. Esch member body interested in a subject for
which a technical committee has been established has the right to be
represented on that committee. International organizations, governmental
and non-governmental, in liaison with ISO, also take patt in the work. ISO
collaborates closely with the International Electrotechnical Commission
(IEC) on all matters of electrotechnical standardization.
Draft International Standards adopted by the technical committees are
circulated to the member bodies for voting. Publication as an International
Standard requires approval by at least 75 % of the member bodies casting
a vote.
International Standard ISO 7285 was prepared by Technical Committee
lSO/TC 44, Welding and allied processes, Subcommittee SC 6, ßesist-
ante welding.
Annexes A, B and C form an integral part of this International Standard.
Annex D is for information only.
. . .
Ill
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ISO 7285: 1995(E)
INTERNATIONAL STANDARD 0 ISO
Pneumatic cylinders for mechanized multiple spot
welding
25 -31,5-40-50-63-80-100-125
1 Scope
-160
This International Standard specifies the requirements
of the geometrical and mechanical characteristics of
3.2 Nominal forces
pneumatic cylinders used for multiple spot welding
machines and their manufacturing, delivery and test
The nominal forces standardized, in kilonewtons, for
specifications.
a pressure of 1 MPa (10 bar) are
These cylinders for a nominal air pressure of 1 MPa
2,19 - 2,86 - 3,61 -4,61 - 5,92 - 7,60 - 9,74
(10 bar) are double-acting, with two Piston stages in
series for the advance during the operational stroke
and the forte, and a Single Piston Stage for the return.
4 Fixing the cylinder
The cylinder is mounted on the machine by one of the
2 Normative reference
methods A to H described in annex A.
The following Standard contains provisions which,
through reference in this text, constitute provisions
5 Dimensions
of this International Standard. At the time of publi-
cation, the edition indicated was valid. All Standards
5.1 Outside dimensions
are subject to revision, and Parties to agreements
based on this International Standard are encouraged
Depending on the method of mounting the cylinder,
to investigate the possibility of applying the most re-
the nominal forte and the nominal stroke, the cylin-
cent edition of the Standard indicated below. Mem-
ders shall have the dimensions indicated in the
bers of IEC and ISO maintain registers of currently
drawings in annex C taking into account the charac-
valid International Standards.
teristics of the electrode holder attachment indicated
in annex B.
ISO 4394-13 980, Fluid power Systems and compo-
nents - Cylinder bat-rels - Part 1: ßequiremen ts for
The nominal values of the maximum outside dimen-
steel tubes with specially finished bores.
sions, in millimetres, are
46-51 -56-63-71 -80-90
3 Nominal characteristics
The cylinders covered by this International Standard
5.2 Bore diameter
are characterized by their nominal stroke, their nom-
inal forte and their outside dimensions. The recommended dimensions, in millimetres, are
40 -45-50-56-63-71-80
3.1 Nominal strokes
Tolerantes shall be in accordance with ISO 4394-1
- H12.
The nominal strokes standardized, in millimetres, are
0 ISO
ISO 7285: 1995(E)
7.6 Leakage
6 Operating specifications
The bodies of the cylinders shall not leak in normal
6.1 Nominal forte
conditions of use (to check this, see 10.5).
The nominal forte shall be given at a pressure of
1 MPa (10 bar) with a tolerante of + 5 %.
-
7.7 Behaviour under pressure
6.2 Return forte
The body of the cylinder shall be able to withstand
The return fo rce shall not be less than 40 % of the
without being damaged a test pressure equal to two
nom inal forte
times the maximum supply pressure applied for 1 min
in each direction (see 10.4).
6.3 Maximum supply pressure
The maximum supply pressure is 1,6 MPa (16 bar).
7.8 Electrode holder attachment
7 Construction
The electrode holder attachment shall be completely
electrically insulated with respect to the body of the
7.1 Point of application of the reaction
cylinder (to check this, see 10.3). This subclause does
not apply to electrode holder attachments according
The cylinders shall function correctly when the re-
to Nos. 13 and 22.
action to the nominal forte is being applied at a
maximum distance of 28 mm from the axis of thrust.
7.2 Piston rod
7.9 Endurante
The sliding bearing surfaces of the rod shall have an
The cylinders shall be able to withstand the endurante
adequate hardness to avoid friction, wear, oxidization
test described in 10.8 according to the requirements
and any scale caused by sputtering (Sparks).
of 10.8.5 and 10.8.6.
7.3 Rotation
The Piston rod assembly is considered as non-
7.10 Finish
rotating. The anti-rotating device shall withstand,
without being damaged, a rotary torque of 150 Nmrn
applied in either direction and at any Point of the travel The outer surfaces shall be protected against cor-
of the Piston rod. rosion.
7.4 Seals
The Seals shall be compatible with fluids used to lu-
bricate the cylinder.
8 Marking
7.5 Perpendicularity - Parallelism between
the mounting Point and the attachment
8.1 Identification of the cylinders
Any faults in perpendicularity or parallelism of the
bearing surface of the body of the cylinder with re-
The cylinders are identified by an alphanumeric sym-
spect to the axis of the shank cone of the electrode
bol, the different numbers or Ietters of which are
holder shall not exceed 0,2 % (for inspection, see
separated by a dash and arranged as follows:
10.2).
0 ISO
ISO 7285: 1995(E)
- apparatus operating
with a pneumatic fluid: letter P
- two-Stage cylinder: number 2
- double-action cylin-
.
. letter D
der
iP-Z-D-A-2,1904600250ll- 1
- method of mount-
letter A to H in ac-
ing:
cordante with an-
nex A
IlSO3285
- nominal forte: indicate the num-
ber from 3.2 1) Name of the manufacturer.
- dimensions of the
body or width of the cyl- Figure 1 - Example of a rating plate
inder defining the Overall
dimensions of the cylin-
.
number giving di-
der .
mension E of an-
9 Delivery conditions
nex C
- nominal stroke: number consisting
The cylinders shall be supplied
of three figures
giving the nominal
- in good working Order;
stroke
- protected so that even after prolonged storage at
- electrode holder at-
the user ’s premises in the original packing, all the
tachment: number consisting
Parts likely to deteriorate (rods, Seals, internal sur-
of two figures
faces, cones, openings, etc.) retain the qualities
symbolizing the at-
required by ISO 7285;
tachment in ac-
cordante with
- with the openings stopped up;
annex B
- in packing the outside of which is marked with the
Examples:
identification specified in clause 8.
P-2-D-A -2,19-46-025-11
P-2-D-C -4,61-63-100-22
10 Inspection and type tests
10.1 Visual inspection
8.2 Rating plate
Conformity to the specifications of 7.10 and clauses
8 and 9 is
...