BS EN 869:2006 pdf download
BS EN 869:2006 pdf download.Safety of machinery一 Safety requirements for pressure metal diecasting units.
— movement of the ancdlary equipment; movement of the iniection system;
— movement of the por operated guards:
— movement of the toggles and holding-up devices:
— movement of the tool clamping devices;
— movement of the tie bar pulling devices,
Some principal examples of mechanical hazards and danger zones are Shown fl 1-igure A.4.
The bursting of reservoirs, pipelines and flexible hoses containing pressurised fluids can cause hazards
4.3 Electrical hazardsicontrol system
4.3.1 Electrical hazards at diecasting machines can occur. e. g.. by
— electrical contact, direct or indirect;
— external influences on electrical equipment;
— damage by thermal radiation or other phenomena such as projection of molten metal partides.
4.3.2 Failures which cause unexpected machine movements can occur in the electric/electronIc control
system and/or in the hydraulic or pneumatic control system
4.4 Thermal hazards
Heat hazards which can occur at diecasting machines by:
— spraying or flowing out of molten metal. e. g..
— out of the parting-line of the die (see Figures A.5, A.6 and A.?); or
— between shot sleeve and plunger (see Figures A,5 and A.6); between nozzle and die (see Figure A.7);
— bursting of slugs:
— contact with structural components of the machine which are heated by the process;
— contact with ancillary equipment which are used to heat the walking substances or dies; release of hot operating fluids:
— heat radiated from furnaces.
4.5 FIre hazards
Fire hazards result from the presence of a combination of molten metal, heating devices, hot surfaces and combustible material, e. g.. flammable greases, flammable hydraulic fluids and presswized combustible release agents in case of a line break
4.6 Noise hazards
Noise generated by pressure metal diecasting units can result in:
permanent hearing lss;
tinitus;
tredness, stress etc:;
other efects such as loss of balance, loss of awareness;
interference with speech communicatin;
inability to hear acoustic warning signals.
1.7 Hazards caused by gases, vapours, fumes and dusts
Hazards caused by dangerous gases, vapours, fumes and dust can occur at diecasting machines, e. g..
by use of lubricants;
by use of release agents;
by fumes, vapours and dust given off when melting and holding some types of metal, e. g. lead aloys;
during cleaning.
4.8 Hazards generated by neglecting ergonomic principles in machinery design
Health can be impaired by neglecting ergonomic principles. Possible causes of injury are:
4.8.1 incorrect liting of heavy loads due to the design of the machine, e. g.. during
setting up the diecasting machine;maintenance of the diecasting machine; manual removing of the castings.
4.8.2 work with repettive motion, e. g.manual feeding of molten metal; manual removing of the castings.
4.8.3 poor working postures due to, e. g. wrong height of operating panel; wrong position of operating panel; poor access for maintenance and stting-up.
4.10 Falls from heights
Thãs hazard can occur at diecasting machines when people work above ground level or over pits either during
normal operation, setting-up or for maintenance purposes.
4.11 Particular hazards with regard to cold-chamber diecasting machines
4.11.1 BurstIng of slugs
Slugs can burst, if they are not sufficiently solidified before being ejected from the shot sleeve.
4.11.2 Injection drive area
In the case of cold-chamber diecasting machines metal flashing and mechanical hazards can occur in the infection drive area between shot sleeve and plunger.
The principal danger areas for spraying metal are shown in Figures A. 5 and A.6.
4.12 Particular hazards of diecasting machines with vertical closing movement
Hazards can occur on diecasting machines with a vertical closing movement because the die can fall under its
own weight.
4.13 Particular hazards with regard to hot-chamber diecastlng machines
4.13.1 Nozzle
Metal spraying can occur it the nozzle is not firmly sealed to the die or to the gooseneck.
The principal danger zones for hazards caused by metal spraying are shown in Figure A.7.
4.13.2 InItiation of the casting process du• to a fault In th. control system Metal spraying can occur if a fault causes metal to be injected with the die open.
