1947 Made Wagner Lathe Converted into CNC Machine with SINUMERIK
FMNC and SIMODRIVE 611U/1FT6 Servomotors
Wagner Lathe was a manual machine where its spindle
and feed axis were driven by 100kW-DC motor-powered table from Ward-Leonard
group. The main drive was fitted using mechanical front coupling.
Table gear change is manually performed.
Spindle and feed axis (X.W.Z) have dependent movement. The feed
mechanism was based on a feed shaft driven by a gear from the main
drive. All feeds selection and controls were manually done.
The machine is very old and all the electrical and hydraulic equipment
is in poor condition.
Expected performance:
The customer will be using this turning lathe to perform grinding
works on polyurethane-coated steel rolls for paper industry. The
smooth spindle rotation would be expected in very low speed typically
2-4 RPM while doing grinding works for 40 tons roll weight in average.
The carriage had to perform the change of feed direction without
stopping the roll rotation. This would require independent-driven
axis with separate axis motor. Table speed and carriage feeds (X,
Z and W axes) to be freely programmable and controlled from an Operator
Panel mounted on the carriage. In addition, the axes must have a
precise movement, to ensure the expected accuracy.
The spindle would be programmed in rotations/minute and the feeds
would programmed in mm/minute and mm/rotation. CNC Conversion Package
CNC Design has supplied the following package to enable the customer
meets the expected performance:
Implementing mechanical conversion to enable independent-drive axis
for X, W, and Z. This comprised of replacement of lead screws on
X and W axis with proper sized ball screws preloaded in factory,
fitting new Siemens 1FT6 servomotors with integrated Alpa gearboxes.
The 20 meters long rack and pinion mechanism for Z axis has been
reused in conjunction with new 1FT6 servomotor with integrated-backlash-free
gearbox. All mechanical works and parts related to this action have
been performed by CNC Design.
Supplying a
new Siemens AC Asychronous motor from 1PH7 series with reduced
power down to 78 kW (earlier 100kW DC motor). This sizing
would be enough in the case of independent feed drives. Spindle
encoder has been allowed to ensure accurate measurement of
spindle speed and position.
Providing more accurate tool movement by
mounting Heidenhain linear scale with associated Digital Read
Out display for tool manual adjustment.
On top all all these actions, CNC Design
has designed, installed and commissioned a new Siemens CNC
control from SINUMERIK FMNC series in conjunction with world
wide proven SIMODRIVE 611U to perform required grinding tasks.
The new operator panel has been mounted on the machine to
provide operator with easy operation of the machine.
CNC Design has completed this project in
less than 12 weeks and the machine has been performed its
newly injected CNC grinding tasks successfully in early of
year 2002.
Click here
for associated Recommendation Letter from the customer.
