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The A99E-CD high-speed horizontal machining center from Makino is the
company’s most flexible and adaptive aerospace manufacturing machine. The
multi-purpose A99E-CD can cut up to 75 percent off cycle times of both milling
and grinding production operations due to its utilization of Continuous Dress
(CD) creep feed grinding technology on the same machine as conventional
high-speed milling processes.
The A99E-CD can mill, bore, drill, tap and turn, as well as grind, using a
patented grinding process. This potent resource combination can further reduce
up to 90 percent of cycle time through combined milling and grinding operations.
Grinding and Continuous Dressing
Continuous Dressing is a vital productivity enhancement. Dressing the wheel
with each revolution always ensures that a fresh, abrasive edge is exposed.
And, it eliminates the buildup of substrate material and saves on grinding wheel
life and improves grinding wheel profile quality.
The new grinding process requires close coordination between the machine, the
coolant supply and the composition of the grinding wheel. The machine positions
the coolant supply nozzle precisely at the proper orientation and adjusts
coolant pressure ahead of the grinding wheel in the process.
The centrifugal force of the rotating wheel then forces the coolant to come
out of the wheel through the grind, keeping the abrasive edges clean, cool and
sharp. The result is a process that enables grinding to achieve far greater
metal removal rates than milling in many hard to machine materials.
Benefits and Advantages
The A99E-CD can remove metal at a rate up to 11 cubic inches (28 cm) per
minute on very tough nickel-based alloys. With 36 kW of power, it can also
remove 11 cubic inches (180 cc) of stock with a process performance rating of Qw
300. Milling is at 12,000 rpm on a spindle with a 4-inch (230 mm) extension,
which includes an 8,000 rpm continuous dress spindle and a 13.8-inch (350 mm)
vertical spindle travel path.
With X, Y and Z-axis travels of 49 x 31 x 49 inches (1,250 x 800 x 1,250 mm),
the A99E-CD allows rapid traverse and maximum cutting feedrate 1,968 ipm (50,000
mm/min). The 31.5 inch (800 mm) square pallet has a maximum workzone of 43.3
inches of depth x 47.2 inches of height (1,100 x 1,200 mm) and accepts loads up
to 3,960 lbs. (1,800 kg).
A99E-CD Features
The rigid, one-piece bed with three-point leveling allows for accurate and
stable machining. Makino’s core cooled spindle and ball screws, as well as
thermal regulation of the CD motor and casing, helps protect both the workpiece
and the machinery.
Tool capacity on the A99E-CD is 25 for 300-mm grinding wheels, up to 29 for
150-mm dressing wheels and up to 32 for 100-mm cutting tools in the ATC. It can
handle 11.8 inches (300 mm) in cutting and grinding tool diameter, 5.9 inches
(150 mm) in dressing roll diameter and can also handle a maximum tool length of
23.6 inches (600 mm) and maximum tool weight of 66 lbs (30 kg).
Advanced data management technology and Makino’s proprietary, next generation
Super Geometric Intelligence (SGI.3) servo control deliver the lowest cycle
times available.
A 5-axis rotary table is optional on the A99E-CD. This allows 0.001 degree
positioning in 5 axes, and an 83.3-rpm maximum rotation speed. Additional
options include:
- programmable coolant nozzle
- automatic coolant nozzle changer
- EROWA pallet workpiece interface
- high-accuracy orientation and clamping for a broaching or turning tool
Makino is a global provider of advanced machining technology and application
support for the metalcutting and die/mold industries, dedicated to driving out
more costs from your manufacturing operation than any other competitive
machine tool manufacturer. Makino manufacturing and service centers are
located in the United States, Japan, Germany, Singapore, Italy, France,
Korea, Taiwan, Turkey, China, Mexico, Brazil and India, and are supported
by a worldwide distributor network. For more information, call
1.800.552.3288, or visit Makino on the Web at
www.makino.com.
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