SCHUNK 1487754, Assembly And Operating Manual

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22 01 | Matrix-Plate SMPL | Assembly- and Operating Manual | en-US | 0489081
Users must verify these theoretical values in relation to the
respective application by carrying out their own tests.
The material, cutting material, machine data (speed, feed, cutting
speed) etc. all need to be taken into account.
The process parameters must always be selected such that the
machining forces are kept as low as possible and safe processing
with sufficient buffer is always possible.
Calculating and Assessing the Clamping Situation
Specialist personnel should always check whether a vacuum can
be used effectively with clamping or handling devices.
With large clamping areas, very large clamping and holding forces
can be achieved, while with small clamping areas, the forces must
be correspondingly smaller.
This requires a certain amount of experience and clear judgment.
The following factors must be considered when using vacuum
clamping systems:
• Contact surfaces wetted with cooling lubricant can significantly
reduce the friction coefficients.
• Size of the clamping area (available clamping area in mm
2
)
• Available vacuum (vacuum in mbar)
• Available suction volume of the vacuum generator (suction
volume in m
3
/h)
• Type, properties and condition of the workpiece (porous, firm,
hard, soft, tough, brittle, air-permeable)
• Type, properties and condition of the tool (prescribed cut data,
tool diameter, cutting forces)
• Processing speed (speed in rpm, feed in mm/min, feed per
tooth)
• Machining cross-sections (infeed depth, chip volume)
• The point of application of the clamping force is at the center of
gravity of the workpiece. This can result in an unfavorable
leverage effect of the machining force especially with elongated
workpieces.
The vacuum clamping force cannot be increased or multiplied at
will. Therefore, the specialist personnel responsible should select
the processing parameters such that the cutting forces acting on
the workpiece are minimal.