TAKAMAZRYU-GI

Contributing significantly to higher chip removal rate and cutting efficiency
Also enabling accurate coolant supply to the cutting pointand extended tool life

vol.18Wavy Nozzle®
Moving nozzle coolant jetter
Chip entanglement problems and conventional
measures to deal with chips
Measures against chips are a perennial issue in cutting.
Chips entangling with the tool or chuck can lead to reductionof yield because workpieces are scratched, lost time throughmachine stoppages to remove chips, reduction of tool life, orin the worst case, damage to the machine.
The standard measure to deal with chips is to introduce ahigh-pressure coolant system. Chips are blown away using asystem generating high-pressure coolant at 8 to 20 MPa.This
method undoubtedly has significant effects, but on compact
lathes it has the demerits of deteriorating cutting accuracy
and shortening machine life due to the vibration of the pump for
spraying the high-pressure coolant, and adversely affecting thefactory environment by generating oil mist.

Mechanism of chip entanglement(1)Start of cutting(2)Generation of chips(3)Chips rotate alongwith material

Resolving the Issue of Entanglement
When workpiece materials whose chips are generated unbroken
on lathes (e.g. aluminum and stainless steel), chips can bewound up as they are carried by the momentum of workpiecerotation and rotated together with the workpiece. This is themain cause of chip entanglement. Once chips have become entangled it is difficult to remove them however much coolant isapplied.
When Wavy Nozzle is used, chips are flushed in a fixed direction, so they do not follow the rotation of the workpiece andare expelled. The tendency of chips to become wrapped roundunder their own weight once they have extended beyond a certain
length is avoided, making it difficult for them to entangle.
To make it possible to deal with a variety of cutting shapes,
there is a feature whereby the operating angle and swing speedof the Wavy Nozzle can be adjusted, and the adjusted values are
stored in memory inside the Wavy Nozzle itself. Then, when thenozzle is actually operated, it can be controlled simply bycalling up the values from memory with M codes in the cutting
program. Using Wavy Nozzle does not lengthen the cycle time.

Other Effects of Using Wavy Nozzle
Swing jetting coolant with Wavy Nozzle not only suppresses
chip entanglement but also has the effect of making it easierfor the coolant to reach the cutting point. With simple sprayingof coolant, its supply to the cutting point can be restrictedby the pressure of the airflow generated by the rotation of theworkpiece. The swinging of the coolant by Wavy Nozzle ensuresthat it is supplied to the cutting point accurately. The factthat coolant strikes the cutting point properly can be expected
to have the effects of improving the surface roughness offinished faces and extending tool life.

Comparison of chips
Comparison with SUS303 (austenite stainless steel)<O.D. turning>(6)Chips entangled(5)Continue to wrap(4)Chips start to wrap
around once entangledaroundWavy Nozzle is a product that has been developed with a newconcept of oscillating the coolant while spraying it.
“Swing jetting” the coolant rather than blowing chips away
like a high-pressure coolant system guides the chips in one
direction and makes it hard for them to entangle.

●Conventional Standard Fixed Coolant

Large curls
Irregular curls

Inconsistent lengths
Sheared surface isserrated

Traces of applied force
on fracture surface●Wavy Nozzle Used (SWEEP Mode)

Small curls
Regular curls
Wavy Nozzle installed inside a TAKAMAZ XG-4. It is compact and takes up little space.
The nozzle swings in the directions indicated by the arrows.

Consistent lengths
Smooth fracture
Sheared surface is flat

Three optimized operation patterns for chip removal featured as standard:“FIX mode”, “SWEEP mode” and “KICK mode”.

“Wavy Nozzle” is a registered trademark of Minebea Co., Ltd. Japan trademark registration numbers: No. 5645210, No. 5645226