Expansion of the Chevalier range of CNC surface grinding
machines, brings new levels of programming flexibility,
with variable graphics simulation for grinding and wheel
dressing, where the speed of review sequences can be
varied by the operator.
Smart surface grinders
THE Smart II - Series of multi-function, 3-axis machines has been
developed for surface, form, step, slicing and profile grinding parts as
diverse as turbine blades, punches, graphite electrodes and ceramics
and production batch work such as automotive cam followers and
valve stems. With the new control and software, the machines can also
be programmed to produce different slots with varying depths and
pitches on the same part. In addition, with the inclusion of a CNC
rotary table giving speeds up to 33revs/min, the machines can be used
to create cylindrical grinding cycles as well.
Key to the flexibility of the Smart-II Series is the simple graphicsbased
conversational control that incorporates a wide range of macros
for grinding and wheel dressing including compensation with full
grinding and wheel dressing simulation. The simulation cycles use the
electronic handwheels for manual axis movements to provide the
facility whereby forward or reverse display of the program paths can
be viewed. The speed the handwheels are rotated in either direction,
governs the speed of the execution of the simulation cycle.
There are four automatic graphic modes for dressing: table type
with single point diamond or diamond roller, overhead diamond
roller or full profile dressing. Further advantage of the Chevalier
The top-selling production cylindrical grinder in the Toyoda
range is now available in the UK from the 600 Centre.
Angle head grinder
DEVELOPED for high speed batch
and production grinding at
45m/sec wheelspeed, the latest
Multi-Task Toyoda GL4A-S11 angle
head cylindrical grinding machine
uses Toyoda STAT hydrostatic and
hydrodynamic bearing technology
for wheelhead and table slideways.
Controlled by Fanuc 21i TB control
with Toyoda developed ‘assistance’
menu software, the machine
specification includes a complete
suite of canned cycles for setting,
grinding, dressing and
maintenance. It has a swing of
320mm with 630 mm between
centres which can accept a load of
150kg and grind parts up to 300mm
diameter.
Central to its heritage and
performance as a production
machine is the heavily ribbed cast
iron box-type construction which is
may 2008
designed so the working area is
very close to the operating position
for ease of loading and unloading.
The slide-aside guarding gives
excellent access with an opening of
over 1,200mm and the swivel, high
specification Fanuc 21i TB control
provides an ideal ergonomic
operation for setting and operation.
The high performance 45m/sec
wheelhead utilises STAT spindle
bearing technology, a hybrid of
hydrostatic and hydrodynamics
giving higher stability, rigidity and
durability than conventional
bearings. The bearing is adjustment
free, eliminates any flutter and
provides excellent damping due to
the pressurised oil film that ensures
no metal to metal contact. The 30°
angle approach, 455 by 100 by
127mm wheel is powered by
7.5kW motor. The wheelhead has a
system is the automatic wheel compensation that can even be executed
in profile dressing mode; while pre-set dressing cycles can be initiated
at anytime during the grinding cycle. Once the dressing cycle is
complete, additional finish or ‘patch’ passes can be made without
having to repeat the complete cycle.
The new machine range spans the Smart II-818, 1224 and 1640
providing table sizes of 200 by 460mm, 300 by 600mm and 400 by
1000mm and table loadings up to 670kg. The maximum distance
from table surface to spindle centre is 406mm on the smallest
machine, 630mm on the 1224 and 630mm on the larger machine.
Grinding wheel sizes are 203 by 12.7 by 31.75mm, 355 by 50 by 127mm
and 355 by 50 by 127mm.
The machine is built on a single T-shaped base casting giving
maximum rigidity with hardened and ground double Vee ways and
Turcite-B coated longitudinal and crossfeed guideways between base,
saddle and table. There is a range of options for the spindle
specification from 1.5 to 11.25 kW depending on the machine size with
further options for oil or air cooling. Additional options include linear
scales, automatic wheel balancing, single disc dresser and a paper filter
coolant system. www.dugard.com
15m/min rapid traverse rate and
minimum increment of 0.0001 mm.
A live/dead spindle workhead with
MT4 taper has a 21 to 500revs/min
speed range with manual tailstock
while the table has a 900mm
working stroke, 10° swivel and a
rapid feed rate of 15m/min.
The grinding control system
assist menu developed by Toyoda
has a full range of canned
operational cycles with set up
guidance, dressing and wheel
change prediction. Included in the
specification is Marposs in-process
gauging, size control and an
automatic lateral locator. As
options gap elimination and spline
auto-sizing for diameters between 5
and 80mm can be specified as well
as inverter wheel speed control.
www.600centre.co.uk
grinding
MWP
47
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