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GB 20775-2006: Fused Deposition Modeling machines -- Technical requirements for safeguarding
GB 20775-2006
GB
NATIONAL STANDARD OF THE
PEOPLE’S REPUBLIC OF CHINA
ICS 25.080.99
J 59
Fused Deposition Modeling Machines – Technical
Requirements for Safeguarding
ISSUED ON: DECEMBER 28, 2006
IMPLEMENTED ON: JULY 1, 2007
Issued by: General Administration of Quality Supervision, Inspection and
Quarantine;
Standardization Administration of the People’s Republic of China.
Table of Contents
Foreword ... 3
1 Scope ... 4
2 Normative References ... 4
3 Terms and Definitions ... 5
4 List of Hazards ... 6
5 Safeguarding Requirements and Measures ... 6
6 Usage Information (See 7.10 for Inspection) ... 10
7 Inspection of Safeguarding Requirements ... 12
Appendix A (Informative) List of Hazards Relevant to this Standard ... 16
Fused Deposition Modeling Machines – Technical
Requirements for Safeguarding
1 Scope
This Standard specifies the safeguarding requirements, measures, usage information and other
technical requirements for safeguarding of fused deposition modeling machines; and also
stipulates the inspection requirements for safeguarding requirements.
This Standard applies to fused deposition modeling machines (hereinafter referred to as
"machines").
2 Normative References
The provisions in following documents become the provisions of this Standard through
reference in this Standard. For dated references, the subsequent amendments (excluding
corrigendum) or revisions do not apply to this Standard, however, parties who reach an
agreement based on this Standard are encouraged to study if the latest versions of these
documents are applicable. For undated references, the latest edition of the referenced document
applies.
GB 2894 Safety signs (GB 2894-1996, neq ISO 3864:1984)
GB 5226.1 Safety of machinery - Electrical equipment of machines--Part 1:General
requirements (GB 5226.1-2002, IEC 60204-1:2000, IDT)
GB/T 14896.7-2004 Non-traditional machine tools - Terminology - Part 7: Rapid
prototyping machines
GB/T 15706.1-1995 Safety of machinery - Basic concept, general principles for design -
Part 1: Basic terminology, methodology (eqv ISO/TR 12100-1:1992)
GB/T 15706.2-1995 Safety of machinery - Basic concepts, general principles for design -
Part 2: Technical principles and specifications (eqv ISO/TR 12100-2:1992)
GB/T 16769-1997 Metal-cutting machine tools--Measurement method of sound pressure
level
GB/T 18569.1-2001 Safety of machinery - Reduction of risks to health from hazardous
substances emitted by machinery - Part 1: Principles and specifications for machinery
manufacturers (eqv ISO 14123-1:1998)
5.1.2 Risks shall be eliminated or reduced through design as much as possible, including the
use of the following measures alone or in combination:
--- Choose appropriate design structures to avoid or reduce risks;
--- Reduce the need for operators to intervene in danger zones to limit their exposure to
hazards.
5.1.3 For hazards that cannot be avoided or adequately limited by design, safeguarding devices
shall be used to protect personnel.
5.1.4 The operator shall be informed through effective means of the remaining risks and certain
hazards that are inconvenient to protect due to insufficient guards. If it can be stated in the
product instruction manual, warning signs or plates shall also be set up at dangerous locations
when necessary.
5.2 Mechanical hazards and safeguarding (see 7.2 for inspection)
5.2.1 The easily accessible parts of the machine shall not have sharp edges, sharp corners, sharp
edges, etc. that can cause personal injury, so as to avoid the risk of punctures and cuts.
5.2.2 Under predetermined working conditions, the machine or its components shall not
accidentally overturn.
5.2.3 Reliable limiting measures shall be taken for the reciprocating parts of the machine. Each
motion axis shall be equipped with reliable electrical and mechanical double limit devices to
prevent the risk of slipping.
5.2.4 The machining area of the machine shall be equipped with an interlocking protective
cover. For machines with a closed structure in the working area, the molding chamber shall be
equipped with an interlocking door.
5.2.5 When the interlocking guard is opened, the machine shall stop working or cannot be
started; and it shall be ensured that it cannot be started before the guard is closed. If the door of
the molding chamber is open, the machine cannot process to prevent the risk of collision when
the nozzle runs at high speed.
5.2.6 The nozzle clamping device shall be safe and reliable to ensure that the nozzle does not
fall or be thrown out during high-speed movement, causing a risk of projection.
5.2.7 Multiple different safeguarding devices shall be considered in greatly hazardous locations
to avoid common cause failure. Such as high temperature protection measures, electrical and
mechanical double limit devices for machine movement axis, etc.
5.3 Safeguarding device (see 7.3 for inspection)
5.3.1 Safeguarding devices are provided for the involved mechanical or other hazards. It shall
satisfy to:
--- Meet the required mechanical strength and stiffness, and have reliable performance;
--- Do not increase any additional hazards (such as causing pinching, shearing, etc.);
--- Can be fixed firmly and reliably.
5.3.2 Frequently disassembled guards shall be easy to assemble and disassemble, and their mass
shall not exceed 6 kg. The opening force of the guards shall be no greater than 40 N.
5.4 Control systems and devices (see 7.4 for inspection)
5.4.1 The control and manipulation system of the moving parts of the machine (referred to as
the control system) shall be functionally reliable and ensure that all functions do not interfere
with each other. It shall be able to withstand the expected workload and external influences,
control interruption and damage to the information carrier, and shall not lead to the emergence
of dangerous situations.
5.4.2 When setting up control devices, additional hazards caused by mis-operation shall be
taken into consideration. Control devices prone to mis-operation shall be designed with fault
tolerance in mind.
5.4.3 The machine shall be equipped with a working state selection switch for each control
function, and each position is only allowed to correspond to one control method or working
state (such as automatic control or adjustment, inspection). Other methods (such as code control)
can also be used to select working state.
5.4.4 A "stop" control device shall be set near each "start" control device. Each operating
position of the machine shall be equipped with an emergency stop device. Emergency stop
devices shall comply with the relevant provisions of GB 5226.1.
5.4.5 The installation height of instruments for frequent observation of readings is generally 0.7
m~1.7 m. The installation height of instruments whose readings are not frequently observed is
allowed to be 0.3 m~2.5 m.
5.5 Electrical hazards and safeguarding (see 7.5, 7.11 for inspection)
5.5.1 The protection level of the electrical box (cabinet) shall comply with the relevant
provisions of GB 5226.1.
5.5.2 The machine shall be reliably grounded, the grounding insulation resistance shall be no
less than 1 MΩ, and meet the continuity requirements of the protection circuit.
5.5.3 The electrical equipment (including components) in the machine molding chamber shall
be electrical products with additional requirements for heat resistance (see the relevant
provisions of GB 5226.1).
5.5.4 ...