ROHM Tool clamping units - Manual (Page 12)

3. Safety requirements and rules and regulations
for the use of tool clamping units
1. Qualification of Operating Personnel
Personnel inexperienced in the handling of clam-
ping equipment may be in particular danger of in-
jury from the clamping actions and forces as a
result of inappropriate conduct, especially during
set-up work.
For this reason the clamping devices may only be
operated, set-up or repaired by personnel with
special training or with many years of experience
in this field.
2. Danger of Injury
For technical reasons this assembly may contain
individual parts with sharp edges. Always proceed
with utmost caution when working with the assem-
bly to prevent the risk of injury!
2.1 Contained forces!
Moving parts pre-tensioned with pressure
springs, tension springs or any other springs
or elastic elements constitute a potential dan-
ger due to the forces they contain. Underesti-
mation of these forces can cause serious in-
jury resulting from uncontrollable, flying com-
ponents travelling at the speed of projectiles.
Prior to executing any further tasks, these con-
tained forces must be released. For this re-
ason the respective assembly drawings must
always be procured prior to dismantling such a
device and such potential hazards detected.
Should the discharge of such contained forces
not be possible without any potential hazard,
such elements should only be dismantled by
authorised
RÖHM personnel.
2.2 Exceeding the Permissible Speed
This tool clamping unit is designed for use in a
machine spindle. The centrifugal forces resul-
ting from excessive speeds or rotational
speeds may result in individual parts beco-
ming detached and constituting a potential
danger for personnel or objects in the vicinity.
Operation at higher speeds than those speci-
fied for this device is not permissible for the
above-mentioned reasons.
The maximum speed and operating force/
pressure are on the assemble drawing and
may not be exceeded. Therefore the maxi-
mum speed of the machine used should not
be higher than the tool clamping unit and must
therefore be limited.
Exceeding permissible values even once can
cause damage and constitutes a latent source
of danger, even if this is not immediately appa-
rent. In such cases the manufacturer must be
notified immediately so that the functionality
and operational safety of the device can be
checked. Only then can the continuing safe opera-
tion of the device be ensured.
2.3 Balance error:
Balance error: a balance error causes a centrifu-
gal force in a rotating spindle which disturbs the
smooth running of the tool mounting. This out-of-
balance effects the work process and the life of
the spindle bearing arrangement. Consequently,
other risks can result from an inadequate rotation
alignment, s. 6.2 No. e) of Standard EN 1550.
This applies in particular in the case of high
speeds or when asymmetrical tool mountings are
used. In order to compensate for undesired centri-
fugal forces as well as to prevent damage arising
from this, the symmetrical mass equilibrium must
be restored with the goal being that no centrifugal
forces act upon the spindle bearing arrangement.
The whole spindle must be dynamically coun-
terbalanced with built-in tool clamping and
clamped workholding when operating at high
speeds (balance master) in accordance with
DIN ISO 1940.
2.4 Calculat. the clamp. forces (holding forces):
for optimal operation the active surface of the in-
terface must be sufficiently braced. The increase
in force of the spring set occurs by means of a
wedge gearing. The efficiency is essentially deter-
mined by friction levels and results in a minimum
force transfer of i=3.
During spindle rotation the tool clamping unit and
the tool mounting are subject to the centrifugal for-
ces acting upon them, which, according to the
speed of rotation, always leads to a small increase
in clamping forces (holding forces).
2.5 The use of different/other tool shanks:
The use of different/other tool shanks: this tool
clamping unit is designed for the clamping of a
specific tool shank. Accordingly, it may only be
used with those tool shanks it has been designed
for. Failure to do so could lead to damage to
equipment or personal injury as a result of insuffi-
cient clamping forces or improper clamp stroke
setting.
Therefore, if other or similar tool shanks are to be
clamped using the same tool clamping unit, the
written authorization of the manufacturer will be
required.
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