1222 HEIDENHAIN Technical Manual iTNC 530 HSCI
If the learning process is ended during a learning step, either via the EXIT
LEARNING soft key or because the programmed time (FN17 - ID622) has
expired, the control immediately begins regulating the feed rate adaptively.
The value determined up to that point is used as the spindle reference value,
and is entered in <NAME>.H.AFC.DEP. This is useful if it can be seen that the
spindle power will not increase significantly any further in this step.
General
information about
controlling
The maximum spindle power was determined for each learning and machining
step. By changing the feed-rate factor within programmable limits (e.g. 70%
to 130%), the software continuously attempts to match the momentary
spindle power to the reference value during machining.
This way the feed rate can be increased for areas where only a small amount
of material is being cleared, and a slower feed rate can be used when there is
more material than usual or the cutter is becoming dull. This protects the
spindle drive and the tool from overload. If a disturbance in the process occurs
during machining, a programmable switch-off reaction is performed. This
occurs if the feed rate falls below the minimum feed-rate factor (e.g. 70%) at
the reference spindle load. You can then assume that the cutter has become
dull or has broken. If the feed rate falls below the defined value of 30% of the
programmed feed rate, an NC stop is performed. This defined error reaction
cannot be influenced, and occurs independently of the programmed overload
reaction.
Controlling can be switched off and on again via soft key at any point during
machining. Controlling is also always switched off if the value set for the
override potentiometer is manually reduced by more than 10%. The
potentiometer is then effective again instead of AFC. Adaptive feed control
must then be switched on again via soft key. A potentiometer value less than
or equal to 50% is also always effective, i.e. AFC is inactive then. If the
potentiometer value exceeds these 50% while AFC is on, then AFC becomes
active again. The maximum spindle power that occurs while under control is
ascertained and saved for evaluation later. The machining time of each
machining section is also saved.
The events AFC ON, AFC OFF, potentiometer manually changed -> AFC OFF
are entered in the log of the iTNC.
If a change to another tool (not replacement tool) takes place within an active
cut, the error message "Faulty assignment of tool/cut no." is issued and an NC
stop is initiated.
If AFC detects at the beginning of a cut that the tool and the associated cut
number do not match, it stops instead of executing an automatic teach-in cut
(NC stop) and the error message "Faulty assignment of tool/cut no." is issued.
After NC start has been pressed again, a teach-in cut is carried out with the
new tool.
In both cases the user can either cancel with internal stop and correct the
cause of the error message, or continue with the actual data by pressing NC
start.
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