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A few years ago
INTERNATIONAL developed, patented and introduced the MINICUT"
roughing End Mill to the metalworking industry. Until that time
the scope of development throughout the cutting tool industry
had been basically concentrated towards different and somewhat
better materials in order to obtain the higher levels of productivity.
The "MINICUT" however, presented a new chapter in cutting
tool evolution with a revolutionary geometric concept applied
to the cutting edge.
In fact the "MINICUT"
End Mill embodies three very particular geometric concepts.
- 1- Variable
radial rake angle with interrupted cut.
- 2- Undulated
flute face.
- 3- Sinusoidal
gullet and trailing faces.
When the cutting
edge comes in contact with the workpiece, the angle of attack
(or rake angle) being continuously different at each point of
the cutting edge, creates a shearing force along the width of
the chip formation while the interaction of this force with the
interrupted rake face obliges the chip to uncouple and evacuate
from the machining surface - therefore elimination of build up
on the cutting edges and reduction in recutting of chips.
The effect and
consequences of the sinusoidal gullet and trailing faces on the
formation of chips are explained as follows:
During chip formation,
as the chip begins to curl within the gullet space this geometry
provides less space in which to curl at the two extremities of
the interrupted cutting edge compared to the central portion.
The sinusoidal gullet in fact reaches its maximum amplitude at
the middle of the interrupted cutting edge. This uneven curling
space creates a springing effect on the chips and together with
the shearing force produce the phenomenon of chip ejection from
the work area as observed by the many users of "MINICUT"
End Mills.
It is this unique
geometry which enables the "MINICUT" to achieve better
machining capabilities over other types of roughing and finishing
high speed cutters used in the industry today.
What we obtain
then is:
- 1- Unique chip
formation.
2- Spontaneous ejection of chips.
3- Elimination of cyclical vibrations.
4- Superior surface finish.
5- Increased feeds and speeds.
6- Reduction in amperage utilization per spindle.
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