20. FUNCTIONS FOR HIGH SPEED
CUTTING B–63522EN/02
NC FUNCTION
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In fine HPCC mode, the feedrate is controlled automatically by
look–ahead operation for blocks. The feedrate is determined according
to the conditions listed below. If a specified feedrate exceeds the
determined feedrate, acceleration/deceleration before interpolation is
performed to achieve the determined feedrate.
(1)Change in feedrate along each axis in a corner and specified
permissible feedrate change amount
(2)Expected acceleration on each axis and specified permissible
acceleration
(3)Change in expected cutting load from the direction of movement along
the Z–axis
Specified tool path
Tool path not under
AI high–precision
contour control
Tool path under
AI high–precision
contour control
Machining error reduced by
deceleration by acceleration rate
Machining error reduced
by deceleration by
feedrate difference
Fig. 20.9
To enable this function, set the following parameters:
Parameter No. 8410 : Permissible feedrate difference used to determine
the feedrate by difference in feedrate at a corner
Parameter No. 8470 : Determines the permissible acceleration used to
determine the feedrate by acceleration
For details, see the explanation of the parameters.
Feedrate control method