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Industrial_Information_-_High_Speed_Milling_Machines

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					Title:
Industrial Information - High Speed
Milling Machines

Word Count:
586

Summary:
High speed machining is a proven st
ipulation characterized by low cutt
ing forces and high metal removal.
High Speed Milling is a technique u
sed in the CNC Milling Industry tha
t combines high spindle speeds with
 increased feed rates. This results
 in a high chip-forming rate and lo
wer milling forces, producing an im
proved surface quality and closer t
olerances. In high speed milling, t
he electronics can make all the dif
ference. The right CNC coupled with
 other elements of the co...


Keywords:
cnc milling machine,bridgeport mill
ing machine,used milling machine,mi
ni milling machine,vertical milling
 machine
Article Body:
High speed machining is a proven st
ipulation characterized by low cutt
ing forces and high metal removal.
High Speed Milling is a technique u
sed in the CNC Milling Industry tha
t combines high spindle speeds with
 increased feed rates. This results
 in a high chip-forming rate and lo
wer milling forces, producing an im
proved surface quality and closer t
olerances. In high speed milling, t
he electronics can make all the dif
ference. The right CNC coupled with
 other elements of the control syst
em can let a slower machine mill a
given form faster than a machine wi
th a higher top feed rate.

1. High Speed Uses

High-speed CNC milling is used, for
 example, to machine the titanium r
otors of the first high-pressure co
mpressor stages of the EJ200 engine
. High speed CNC milling allows cos
t-effective milling of the airfoil
geometry from the solid. By subsequ
ent finishing operations the planne
d surface finish is achieved. The C
NC milling which caters to high spe
ed must be structured with an axis
movement system that is suitable fo
r machining.

2. Axis Movement

The high-speed CNC milling machines
 required for the process must be f
itted with an axis movement system
suitable for machining blisks, whic
h should be at least 5 axes simulta
neously, depending on the milling t
ask involved and an efficiently hig
h-speed control system.

3. 3D Surfaces

High Speed CNC milling machines wor
king on 3D surfaces in any material
s produce a finer surface finish an
d higher accuracy in less time that
 the traditional milling machine. A
cceleration is the most critical fa
ctor that affects the high speed ma
chining. Since one or more axis are
 always increasing or decreasing ve
locity in a 3-D cut, ultimate feed
rate is directly related to acceler
ation

4. What Can A High Speed Control Pos
sibly Do?

A CNC milling machine which possess
es a higher structural stiffness ha
s a greater potential acceleration
rate. Box shaped high speed CNC mil
ling machine, like Bridge and Gantr
y is the mostly widely used types o
f High speed CNC milling tools. The
 overhead type Gantry exudes the hi
ghest stiffness, acceleration and a
ccuracy among other high speed CNC
milling tools. Due to its scalabili
ty, this machine type is available
in sizes to match the work piece, f
rom small to large.

In usual terms, it simply gives you
 the ability to finish one task fas
ter and move along to the next soon
er, making work output higher. In d
rilling and tapping, this can resul
t in faster hole-to-hole times, qui
cker spindle reversals for tapping,
 and substantial cycle-time reducti
ons. The most dramatic benefits, th
ough, come in 3D designs machining.
 Few, drilling and tapping jobs req
uire a million lines of machine cod
es. In molds, dies, patterns, and p
rototypes, complex surfaces compris
ing a million or more line segments
 are not at all uncommon. Saving ju
st a fraction of a second per move
can result in substantial cycle-tim
e improvements.

5. Downsides - When Is Fast Too Fast
?

But despite all these benefits, in
high milling, the tool path segment
s can be so short that a machining
center moving at a high feed rate c
an’t accelerate or decelerate fast
enough to make direction changes ac
curately. Corners may be rounded of
f and the work piece surface may be
 gouged. Look-ahead is one answer.
Look-ahead capability can let the C
NC read ahead a certain number of b
locks in the program, to anticipate
 sudden direction changes and slow
the feed rate accordingly.

6. Additional Benefits:

-   Improved accuracy
-   Better fit
-   Superior finish
-   Better life
-   Produce more work in less time
- Improving the accuracy and finish
- Reducing polishing and fitting tim
e
- Tools simply last longer because
their chip load is more consistent

				
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