SIST EN 13736:2003
(Main)Safety of machine tools - Pneumatic presses
Safety of machine tools - Pneumatic presses
1.1 This European Standard specifies technical safety requirements and protective measures to be adopted by persons undertaking the design as defined in 3.11 of EN 292-1:1991, manufacture and supply of pneumatic presses the intended use of which is the cold working of metal or material partly of metal as defined in 3.1.13 and hereafter referred as machines.
This standard also applies to machines which are integrated into an automatic production line where the hazards and risk arising are comparable to those of machines working separately.
1.2 This standard also covers pneumatic presses:
3 whose primary intended use is the cold working of metal, which are to be used in the same way to work other sheet materials (e.g. cardboard, plastic, rubber, leather) and metal powder;
3 with an intermediate pneumatic/hydraulic intensifier.
1.3 The requirements in this standard take account of intended use, as defined in 3.12 of EN 292-1:1991. This standard presumes access to the press from all directions, deals with the hazards described in clause 4, and specifies the safety measures for both the operator and other exposed persons.
1.4 This standard also applies to ancillary devices which are an integral part of the press. This standard also applies to machines which are integrated into an automatic production line where the hazards and risk arising are comparable to those of machines working separately.
1.5 This standard does not cover machines whose principal designed purpose is:
Sicherheit von Werkzeugmaschinen - Pneumatische Pressen
1.1 Diese Europäische Norm legt technische Sicherheitsanforderungen und Schutzmaßnahmen fest, die von Konstrukteuren (wie in 3.11 von EN 292-1:1991 definiert), Herstellern und Lieferanten von pneumatischen Pressen anzuwenden sind, deren bestimmungsgemäße Verwendung die Kaltbearbeitung von Metall oder teilweise aus Metall bestehendem Werkstoff, wie in 3.1.13 definiert, ist und ab hier als Maschinen bezeichnet werden.
Diese Norm gilt auch für Maschinen die in Fertigungssystemen integriert sind, wenn die auftretenden Gefahren und Risiken vergleichbar mit denen einer separat betriebenen Maschine sind.
1.2 Diese Norm gilt auch für pneumatische Pressen:
deren hauptsächlicher Verwendungszweck die Kaltbearbeitung von Metall ist und die in gleicher Weise für die Bearbeitung von anderem Tafelmaterial (z. B. Pappe, Kunststoff, Gummi, Leder) und Metallpulver eingesetzt werden sollen;
die mit einem hydropneumatischen Druckverstärker versehen sind.
1.3 Die in dieser Norm enthaltenen Anforderungen beziehen die bestimmungsgemäße Verwendung mit ein, wie in 3.12 von EN 292-1:1991 definiert. Diese Norm unterstellt Zugang zur Presse von allen Seiten, behandelt die in Abschnitt 4 beschriebenen Gefährdungen und legt die Sicherheitsmaßnahmen sowohl für den Bediener als auch andere exponierte Personen fest.
1.4 Diese Norm gilt auch für Zusatzeinrichtungen, die fester Bestandteil der Presse sind. Diese Norm gilt auch für die, in einer automatischen Fertigungslinie integrierten Fertigungssysteme, bei denen die Gefährdungen und Risiken vergleichbar sind mit denen an einzelnen Maschine.
1.5 Diese Norm gilt nicht für Maschinen, deren Hauptzweck ist:
a) Schneiden von Blech mit einer Tafelschere;
b) Biegen oder Abkanten mit pneumatischen Gesenkbiegepressen oder pneumatischen Schwenkbiegemaschinen;
c) Punktschweißen;
d) Rohrbiegen;
e) Richten;
f) Kaltmassivumformung;
g) Schlagen mit Drucklufthammer;
h) Verdichtung von Metallpulver.
Diese Norm deckt nicht spezielle, pneumatische
Sécurité des machines-outils - Presses pneumatiques
La présente norme spécifie les prescriptions techniques de sécurité et les dispositions que doivent respecter les personnes chargées de la conception (comme défini en 3.11 de l'EN 292-1:1991), de la construction et de la fourniture des presses pneumatiques conçues pour le travail a froid des métaux ou des matériaux partiellement constitués de métal.
Varnost obdelovalnih strojev – Pnevmatske stiskalnice
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 13736:2003
01-november-2003
Varnost obdelovalnih strojev – Pnevmatske stiskalnice
Safety of machine tools - Pneumatic presses
Sicherheit von Werkzeugmaschinen - Pneumatische Pressen
Sécurité des machines-outils - Presses pneumatiques
Ta slovenski standard je istoveten z: EN 13736:2003
ICS:
25.120.10 Kovaški stroji. Stiskalnice. Forging equipment. Presses.
Škarje Shears
SIST EN 13736:2003 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 13736:2003
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SIST EN 13736:2003
EUROPEAN STANDARD
EN 13736
NORME EUROPÉENNE
EUROPÄISCHE NORM
January 2003
ICS 25.120.10
English version
Safety of machine tools - Pneumatic presses
Sécurité des machines-outils - Presses pneumatiques Sicherheit von Werkzeugmaschinen - Pneumatische
Pressen
This European Standard was approved by CEN on 15 November 2002.
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,
Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Slovakia, 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
© 2003 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 13736:2003 E
worldwide for CEN national Members.
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Contents
page
Foreword.3
Introduction .4
1 Scope .4
2 Normative references .5
3 Terms and definitions, abbreviations .6
4 List of significant hazards.10
5 Safety requirements and/or protective measures .12
6 Verification of the safety requirements and/or protective measures.29
7 Information for use .34
Annex A (normative) Calculation of minimum safety distances .37
Annex B (normative) Closed tools.39
Annex C (informative) Examples and principles of pneumatic press and power interlocking .40
Annex D (informative) Electro-sensitive protective equipment (ESPE) using active opto-electronic
protective devices (AOPDs).44
Annex E (normative) Conditions for noise measurement of pneumatic presses .45
Annex ZA (informative) Relationship of this standard with EC Directives.46
Bibliography .47
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Foreword
This document (EN 13736:2003) has been prepared by Technical Committee CEN/TC 143 „Machine tools –
Safety“, the secretariat of which is held by SNV.
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 2003, and conflicting national standards shall be withdrawn at the latest by
July 2003.
This document has been prepared under a mandate given to CEN by the European Commission and the European
Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document.
Organisation contributing to the preparation of this European Standard include the European Manufacturer
Association CECIMO.
NOTE The safety requirements related to the use of PES or PPS will be dealt with at its next revision.
The European Standards produced by CEN/TC 143 are particular to machine-tools and complement the relevant A
and B standards on the subject of general safety (see introduction of EN 292-1:1991 for a description of A, B and C
standards).
Annexes A, B and E are normative. Annexes C and D are informative.
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, Hungary, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal,
Slovalia, Spain, Sweden, Switzerland and the United Kingdom.
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Introduction
This European Standard has been prepared to be a harmonized standard to provide one means of conforming with
the essential safety requirements of the ”Machinery“ Directive and associated EFTA Regulations. It is a C-type
standard as described in EN 1070:1998.
The machinery concerned and the extent to which hazards, hazardous situations and events are covered are
indicated in the scope of this standard. When provisions of this type C standard are different from those which are
stated in type A or B standards, the provisions of this C type standard take precedence over the provisions of other
standards, for machines that have been designed and built according to the provisions of this type C standard.
Complementary guidance is given in the A and B standards to which reference is made in the text (see clause 2).
The figures are intended to be examples only and not to give the only interpretation of the text.
The requirements of this European Standard concern designers, manufacturers, suppliers and importers of
machines described in the scope.
This standard also includes information to be provided by the manufacturer to the user.
1 Scope
1.1 This European Standard specifies technical safety requirements and protective measures to be adopted by
persons undertaking the design as defined in 3.11 of EN 292-1:1991, manufacture and supply of pneumatic
presses the intended use of which is the cold working of metal or material partly of metal as defined in 3.1.13 and
hereafter referred as machines.
This standard also applies to machines which are integrated into an automatic production line where the hazards
and risk arising are comparable to those of machines working separately.
1.2 This standard also covers pneumatic presses:
whose primary intended use is the cold working of metal, which are to be used in the same way to work other
sheet materials (e.g. cardboard, plastic, rubber, leather) and metal powder;
with an intermediate pneumatic/hydraulic intensifier.
1.3 The requirements in this standard take account of intended use, as defined in 3.12 of EN 292-1:1991. This
standard presumes access to the press from all directions, deals with the hazards described in clause 4, and
specifies the safety measures for both the operator and other exposed persons.
This standard also applies to ancillary devices which are an integral part of the press. This standard also
1.4
applies to machines which are integrated into an automatic production line where the hazards and risk arising are
comparable to those of machines working separately.
1.5 This standard does not cover machines whose principal designed purpose is:
a) sheet metal cutting by guillotine;
b) bending or folding by pneumatic press brakes or folding machines;
c) spot welding;
d) tube bending;
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e) straightening;
f) drop stamping;
g) working by pneumatic hammer;
h) compaction of metal powder.
Special pneumatic machines for assemblying or calibrating are not covered but this standard may be used as a
basis for there machines.
1.6 This standard does not cover the safety requirements related to the use of PES or PPS. They will be dealt
with at its next revision.
1.7 This standard is not applicable to machines which are manufactured before the date of publication of this
document by CEN.
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 292-1:1991, Safety of machinery – Basic concepts, general principles for design – Part 1: Basic terminology,
methodology.
EN 292-2:1991, Safety of machinery – Basic concepts, general principles for design – Part 2: Technical principles
and specifications.
EN 294:1992, Safety of machinery – Safety distance to prevent danger zones being reached by the upper limbs.
EN 349:1993, Safety of machinery – Minimum gaps to avoid crushing of parts of the human body.
EN 418:1992, Safety of machinery – Emergency stop equipment, functional aspects – Principles for design.
EN 574:1996, Safety of machinery – Two-hand control devices – Functional aspects - Principles for design.
EN 614-1 Safety of machinery – Ergonomic design principles – Part 1: Terminology and general principles.
EN 894-2:1997, Safety of machinery – Ergonomics requirements for the design of displays and control actuators –
Part 2: Displays.
EN 894-3:2000, Safety of machinery – Ergonomics requirements for the design of displays and control actuators –
Part 3: Control actuators.
EN 953:1997, Safety of machinery – Guards – General requirements for the design and construction of fixed and
movable guards.
EN 954-1:1996, Safety of machinery – Safety-related parts of control systems – Part 1: General principles for
design.
EN 982:1996, Safety of machinery – Safety requirements for fluid power systems and their components –
Hydraulics.
EN 983:1996, Safety of machinery – Safety requirements for fluid power systems and their components –
Pneumatics.
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EN 999:1998, Safety of machinery – The positioning of protective equipment in respect of approach speeds of
parts of the human body.
prEN 1005-2:1998, Safety of machinery – Human physical performance – Part 2: Manual handling of machinery
and component parts of machinery.
EN 1037, Safety of machinery – Prevention of unexpected start-up.
EN 1050:1996, Safety of machinery – Principles for risk assessment.
EN 1070:1998, Safety of machinery – Terminology.
EN 1088:1995, Safety of machinery – Interlocking devices associated with guards – Principles for design and
selection.
EN 1127-1:1997, Explosive atmospheres – Explosion prevention and protection – Part 1: Basic concepts and
methodology.
EN 1837:1999, Safety of machinery – Integral lighting of machines.
EN ISO 3746:1995, Acoustics – Determination of sound power levels of noise sources using sound pressure –
Survey method using an enveloping measurement surface over a reflecting plane (ISO 3746:1995).
EN ISO 4871:1996, Acoustics – Declaration and verification of noise emission values of machinery and equipment
(ISO 4871:1996).
EN ISO 11202:1995, Acoustics – Noise emitted by machinery and equipment – Measurement of emission sound
pressure levels at a work station and at other specified positions – Survey method in situ (ISO 11202:1995).
EN ISO 11688-1:1998, Acoustics – Recommended practice for the design of low-noise machinery and equipment –
Part 1: Planning (ISO/TR 11688-1:1995).
EN 60204-1:1997, Safety of machinery - Electrical equipment of machines - Part 1: General requirements (IEC
60204-1:1997).
EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 60529:1989).
EN 61310-2:1995, Safety of machinery – Indication, marking and actuation – Part 2: Requirements for marking
(IEC 61310-2:1995).
EN 61496-1:1997, Safety of machinery – Electro-sensitive protective equipment – Part 1: General requirements
and test (IEC 61496-1:1997).
prEN 61496-2:1997, Safety of machinery – Electro-sensitive protective equipment – Part 2: Particular requirements
for equipment using active opto-electronic devices (IEC 61496-2).
3 Terms and definitions, abbreviations
3.1 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 1070:1998 and the following
apply. Further terms and definitions are provided in relevant type A and type B standards and in annex A of
EN 292-2:1991/A1:1995.
3.1.1
ancillary device
any device intended for use with the press tools and integrated with the press (e.g. devices for lubrication, feed,
ejection)
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3.1.2
cycle, automatic
operating mode where the slide/ram repeats continuously or intermittently, all functions achieved without manual
intervention into the danger zone after initiation
3.1.3
cycle, operating
movement of the slide/ram from the cycle start position (normally the top dead centre) to the bottom dead centre
and back to the cycle stop position (normally the top dead centre). The operating cycle includes all operations
carried out during this movement
3.1.4
cycle, single
operating mode where each operating cycle of the slide/ram has to be positively actuated by the operator
3.1.5
dead centres
points at which the tool, during its travel, is
either nearest/closest to the die (generally it corresponds to the end of the closing stroke), known as the
bottom dead centre (BDC),
or furthest from the die (generally it corresponds to the end of the opening stroke), known as the top dead
centre (TDC)
3.1.6
die
fixed part of the tools used in a press
3.1.7
early opening interlocking guard
guard associated with an interlocking device which, if opened when any dangerous movement in the tools area has
ceased, does not interrupt the operating cycle
3.1.8
monitoring
safety function which ensures that a safety measure is initiated if the ability of a component or an element to
perform its function is diminished, or if the process conditions are changed in such a way that hazards are
generated
3.1.9
muting
temporary automatic suspension of a safety function(s) by safety related parts of the control system (3.7 of
EN 954-1:1996)
3.1.10
overall system stopping performance; overall response time
time occurring from actuating the protective device to the cessation of hazardous motion, or to the machine
assuming a safe condition
3.1.11
closing time
time from the initiation of signal to start the movement TDC to BDC
3.1.12
part detector
device which detects the work-piece and/or the correct position of the work-piece and which permits or prevents
the initiation of the stroke
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3.1.13
pneumatic press
stationary machine designed or intended to transmit energy by linear movement between closing tools by
pneumatic means for the purpose of the working (e.g. forming or shaping of metal or material partly of metal (see
Figure 1)
3.1.14
position switch
switch which is operated by a moving part of the machine when this part reaches or leaves a predetermined
position
3.1.15
redundancy
application of more than one device or system, or part of a device or system, with the objective of ensuring that, in
the event of one failing to perform its function, another is available to perform that function (3.44 of EN 60204-
1:1997)
3.1.16
slide/ram
main reciprocating press member which holds the tool
3.1.17
tool (punch)
moving part of the tools
3.1.18
tool protective device
device which protects the tool against damage by stopping the stroke or by preventing its start
3.1.19
tools
term for the combination of tool and die
3.1.20
tools, closed
tools designed and constructed to be inherently safe (see Figure B.1)
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Figure 1 — Example of a down-stroking pneumatic press
3.2 Abbreviations
3.2.1 M Monitoring (see 3.1.8)
3.2.2 R Redundancy (see 3.1.15)
3.2.3 S Single system
3.2.4 BDC Bottom dead centre (see 3.1.5)
3.2.5 TDC Top dead centre (see 3.1.5)
3.2.6 PES Programmable electronic systems
3.2.7 PPS Programmable pneumatic systems
3.2.8 AOPD Active opto-electronic protective devices
3.2.9 ESPE Electro-sensitive protective equipment
3.2.10 THCD Two-hand control device
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4 List of significant hazards
4.1 The list of hazards contained in Table 1 is the result of a hazard identification, their associated danger zones
and reference to protective measures for pneumatic presses covered by the scope of this standard. The safety
requirements and/or protective measures and information for use contained in clauses 5 and 7 are based on a risk
assessment and deal with the identified hazards by either eliminating them or reducing the effects of the risks they
generate.
4.2 The risk assessment assumes foreseeable access from all directions, as well as unexpected and unintended
strokes or gravity falls. Risks to both the operators and other persons who can have access to the danger zones
are identified, taking into account hazards which can occur under various conditions of intended use (e.g.
commissioning, tool setting, production, maintenance, repair, decommissioning, dismantling - see also 3.11 of
EN 292-1:1991) during the life of the machine. The assessment includes an analysis of the effect of failure in the
control system.
4.3 The user of this standard (i.e. the designer, manufacturer, supplier) shall check that the list of significant
hazards in Table 1 is complete for the machine under consideration. If the user determines that there are additional
hazards then he shall analyse and evaluate the risks associated with these hazards in accordance with EN 1050
with particular attention to the intended use of the machine (e.g. commissioning, tool setting, production,
maintenance, repair, decommissioning, dismantling - see also 3.11 of EN 292-1:1991), and its reasonably
foreseeable misuse.
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Table 1 — Significant hazards, danger zones, preventive measures
No. Hazards Danger zone Relevant Relevant Preventive
clauses in clauses in measures:
EN 292- EN 292-1: relevant
2/A1:1995 1991 clauses in this
standard
1.0Mechanical hazards Tools and associated area: 1.3 4.2 5.1, 5.3 to 5.5
generated by: – between tools, (except 1.3.6)
machine parts or work-pieces – moving slide/ram
– between the moving and the
fixed parts of the pneumatic
press
accumulation of energy inside – moving die cushions 1.5.3, 1.6.1, 4.2 5.8.2
machinery caused, for – moving work-piece ejectors 1.6.3
example, by: – moving guards
– elastic elements (springs)
– liquids and gases under
pressure
1.1 Crushing hazard Outside tools area: 1.3 (except 4.2.1 5.2.1, 5.2.2, 5.3
– from hazardous situation of 1.3.6) to 5.6
falling objects
1.2 Shearing hazard 1.4 (except
1.3 Cutting or severing hazard 1.4.2.3)
1.4 Entanglement hazard 1.5.14
1.5 Drawing-in or trapping hazard
1.6 Impact hazard Moving parts of electrical, 1.3 4.2.1 5.6
hydraulic and pneumatic
equipment
Mechanical handling device
1.9 High pressure fluid injectionPneumatic system, 1.3.2 4.2.1 5.2.3.4, 5.6.5,
or ejection hazard Hydraulic system 5.8.2
2.0 Electrical hazards due to:
2.1 Contact of persons with live Electrical equipment 1.5.1, 1.6.3 4.3 5.8.1
parts (direct contact)
2.2 Contact of persons with parts Electrical equipment 1.5.1 5.8.1
which have become live
under faulty conditions
(indirect contact)
4.0 Noise hazards
4.1 Hazards generated by noise Any area at the pneumatic 1.5.8 4.5 5.8.3
resulting in hearing losses press where there is a risk to
(deafness) hearing
8.0 Hazards generated by neglecting ergonomic principles in machinery design, as e.g. from:
8.1 Unhealthy postures or The working position and any 1.1.2 d), 1.1.5, 4.9 5.8.5
excessive effort area for controls, setting, 1.6.2, 1.6.4
8.2 Inadequate consideration of maintenance and handling 1.1.2 d), 2.2
hand-arm foot-leg anatomy
8.4 Inadequate local lighting 1.1.4 5.8.5.3,
7.2.2 e)
8.6Human error, human 1.1.2 d), 1.2.2, 4.9 5.4.4, 5.4.6.1,
behaviour 1.2.5, 1.2.8, 5.4.6.5, 5.4.7
1.5.4, 1.7
8.7 Inadequate design, location 1.2.2 5.4.6, 5.8.5.2
or identification of manual
controls
8.8 Inadequate design or location 1.7.1 5.8.5.2
of visual display units
(continued)
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Table 1 (concluded)
No. Hazards Danger zone Relevant Relevant Preventive
clauses in clauses in measures:
EN 292-2 EN 292- relevant
/A1:1995 1:1991 clauses in this
standard
10 Unexpected start-up, unexpected overrun/ over-speed
10.1 Failure/disorder of the control Tools and associated area: 1.2.7, 1.6.3 5.2 to 5.5
system
– between tools,
10.2 Restoration of the energy – moving slide/ram 1.2.6 5.4.1.1
supply after an interruption
– between the moving and the
fixed parts of the pneumatic
press,
– moving die cushions
10.3External influences on – moving work-piece ejectors 1.2.1, 1.5.11 5.4.1
electrical equipment
– moving guards
10.5 Errors in the software 1.2.1 5.4.3
10.6 Errors made by the operator 1.1.2 d), 1.2.2, 4.9 5.3, 7.2.2
(due to mismatch of 1.2.5, 1.2.8,
Outside tools area:
machinery with human 1.5.4, 1.7
– from hazardous situation of
characteristics and abilities,
falling objects
see 8.6 of Table 1)
13 Failure of the power supply 1.2.6 5.4.1.1
14 Failure of the control circuit
1.2.1, 1.2.3, 5.2 to 5.5
1.2.4, 1.2.5,
1.2.7, 1.6.3
15 Errors of fitting tools 1.5.4 4.9 5.3.17
16 Break-up during operation Mechanical, electrical, hydraulic 1.3.2 4.2.2 5.2.3.4,
and pneumatic equipment 5.2.3.7,5.2.3.8,
5.2.3.9, 5.4.5
17 Falling or ejected objects or Machine components 1.3.3 5.3.17, 5.3.17.1
fluids
Work-pieces and tools
19 Slip, trip and fall of persons All access and/or work at 1.5.15 4.2.3 5.7
(related to machinery) heights
Floor area around the
pneumatic press
5 Safety requirements and/or protective measures
5.1 Introduction
Pneumatic presses shall comply with the safety requirements and/or protective measures of this clause. In addition,
the pneumatic press shall be designed according to the principles of EN 292 for hazards relevant but not significant
which are not dealt with by this standard.
The methods or measures to be implemented to eliminate the significant hazards or reduce their associated risks
are detailed in this clause in the following manner:
basic design considerations for major press components or systems (see 5.2);
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safeguarding against mechanical hazards in the tools area under different modes of production (see 5.3 and
Tables 2, 3 and 4);
protection against hazards due to control system or control component failures (see 5.4);
safeguarding against hazards which can occur during tool setting, trial strokes, maintenance and lubrication
(see 5.5);
safeguarding against other hazards (see 5.6 to 5.8).
5.2 Basic design considerations
5.2.1 Prevention of unintended gravity fall during production (down-stroking press)
5.2.1.1 Where there is a risk of injury (mass of the mobile component exceeding 15 kg) measures shall be
provided to prevent injury from unintended gravity fall of the slide/ram in the production mode with manual or
automatic feed or removal (see Tables 2 and 3). Such a fall may be due to a failure of the pneumatic system,
mechanical failure or a failure of the electrical control system. The risk shall be prevented by a mechanical and/or a
pneumatic restraint device or a combination of the two. The restraint device(s) shall operate automatically and shall
be effective whenever the tool is stopped and operator access to the tools is possible.
5.2.1.2 The restraint device may consist of any of the following measures, provided that they are capable of
holding up the slide/ram:
a) return spring;
b) clamping device;
c) one, or if necessary, for flow consideration, two restraint valves fitted to the cylinder outlet.
NOTE 1 See also 5.4.1.2 and 5.4.1.3 for the control system requirements to prevent unintended strokes.
NOTE 2 Automatic monitoring of the check valve(s) is not required.
5.2.2 Prevention of gravity fall during maintenance or repair
Where there is a risk of injury (mass of the mobile component exceeding 15 kg), measures shall be provided to
prevent injury from a gravity fall of the slide/ram during maintenance or repair, either:
a) the mechanical restraint device as refered to 5.2.1 shall be designed to conform to 5.2.1.2 a or b; or
b) a scotch shall be provided for manual insertion into the press.
Where the mechanical restraint device or the scotch is not capable of absorbing the entire press force, it shall be
interlocked to the press control so that the closing stroke cannot be performed while the device is in position and
the press slide/ram is retained in the up position according to EN 1037.
5.2.3 Pneumatic systems
5.2.3.1 Pneumatic system shall be designed in accordance with the requirements of EN 983 and in addition.
5.2.3.2 Filters, pressure regulators and water separators shall be provided.
5.2.3.3 Devices shall be provided to ensure that the permitted range of working pressure is maintained (see
7.2.2).
5.2.3.4 Pressurized transparent bowls (e.g. glass, plastic) shall be protected to prevent injury from flying
particles without affecting visibility.
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SIST EN 13736:2003
EN 13736:2003 (E)
5.2.3.5 All piping, pipe connector, passages, surge or storage tanks and cored or drilled holes, shall be free
from burrs or foreign matter which might cause damage to valves (see 5.3.4.2.3 of EN 983:1996).
5.2.3.6 Each run of piping shall, where practicable, be continuous from one piece of apparatus to another.
Precautions shall be taken to prevent damage by thermal expansion. Rigid piping shall be securely supported at
frequent intervals to avoid vibration or movement. Care shall be taken to avoid kinking of flexible pipes used to
carry fluids. Such kinking can cause traps which prevent the fluid exhausting.
5.2.3.7 Where a drop in pressure can lead to unintended hazardous motion of the slide/ram, pipes and pipe
connectors shall be chosen to prevent such a loss of pressure. Such pipe connectors shall not be made with, glued
rings or similar devices.
5.2.3.8 Operating valves shall be fitted to a plate or to the cylinder. This is to avoid undesirable effects from
vibration which can affect both valves and piping.
5.2.3.9 Control valves and other control components (e.g. regulators, manometers) shall be mounted in
positions which provide accessibility and avoid damage (see 5.2.1 of EN 983:1996).
5.2.3.10 Where valves are manually or mechanically (as distinct from electrically) operated, the arrangements
for restoring the valves shall automatically move the valve to the safe position (see also 5.4.7).
NOTE The safe position can be the open or closed position of a valve, depending upon the well-tried principles in the
pneumatic circuit.
5.2.3.11 Where valves or other parts of the press control system require lubrication, visible automatic means of
lubrication shall be provided to introduce the oil into the air line in suitable form (see 7.2.2 l) and o)).
5.2.3.12 Where silencing systems are fitted, they shall be provided and installed in accordance with the valve
manufacturer´s instructions for use in safety systems and shall not affect safety functions.
5.2.3.13 Pneumatic systems which include air receiver or air reservoir shall allow the pressure to fall when the
pressure generating unit is stopped. If this is impossible,
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