
B–63522EN/02
9. SPINDLE FUNCTIONS
NC FUNCTION
121
In machine tools having two spindles (such as a lathe), the speeds of the
two spindles sometimes have to match. This requires when a workpiece
held on the first spindle is transferred to the second spindle while the
spindles are rotating, and when acceleration/deceleration is performed
while a workpiece is being held by the first and second spindles.
When a workpiece having a different figure is transferred between the
spindles, the rotation phases (rotation angles) of the spindles must also
match.
The serial interface spindle synchronization control function is provided
to provide synchronization control for two spindles.
You can perform spindle orientation simply by mounting a position coder
on the spindle. Stoppers or pins for physically stopping the spindle at a
specified position are not necessary. A spindle can be instantly oriented,
even when rotating at high speed, thereby greatly reducing the orientation
time.
Spindle output switching switches between the two windings, one for low
speed and the other for high speed, incorporated into the special spindle
motors. This ensures that the spindle motor demonstrates stable output
characteristics over a wide range.
When one–path control or two CPUs with two–path control is performed,
up to four serial spindles can be connected.
The third serial spindle operates as an ordinary third analog spindle. For
the third, as well as the first and second serial spindles, all the functions
supported by the serial spindle control unit (spindle orientation, spindle
output switching, and spindle switching) can be used.
When the third spindle orientation function is used, stop–position
external–setting type orientation can also be performed for the third
spindle.
When the fourth spindle orientation function is used, stop–position
external–setting type orientation can also be performed for the fourth
spindle.
In simple spindle synchronous control mode, the second spindle can be
controlled as a slave axis of the first spindle.
Thus, control based on the Cs contour axis control function, rigid tapping
function, and spindle positioning function (T series) can be exercised over
the second spindle, under the control of the first spindle.
Note, however, that unlike spindle synchronous control, simple spindle
synchronous control does not guarantee synchronization between the first
and second spindles.
To realize simple spindle synchronous control, two serial spindle
systems, both of which support two–spindle connection, are required.
Moreover, both spindles must be fitted with the spindle–related hardware,
such as detectors, required for the functions used with simple spindle
synchronous control (Cs contour axis control function, rigid tapping
function, and spindle positioning function (T series)).
9.12
SPINDLE
SYNCHRONIZATION
CONTROL
9.13
SPINDLE
ORIENTATION
9.14
SPINDLE OUTPUT
SWITCHING
9.15
THREE/FOUR
–SPINDLE SERIAL
OUTPUT
9.16
SIMPLE SPINDLE
SYNCHRONOUS
CONTROL