Two axes head

The equipment can be installed on the machine to follow particular machinings that with a fixed head would not be possible.

This head with two continuous head is controlled with a CNC as 4° and 5° working axis.

Therefore, assembled on a machine tool with 3 axes, it allows milling machinings with 5 axes, both interpolated in continuous movement and positioned, both in finishing and roughing.

The structure is particularly rigid in cast iron allows to carry tools with the following maximum features:

• Maximum weight: 30 Kg

• Maximum diameter: 400 mm

• Maximum length of the tool carrier from the head of the spindle: 450mm

These features can be reduced according to the type of electro-spindle assembled (please refer to its manual).

General description

The head with 5 axes with electro-spindle, controlled by CNC as 4° and 5° axis, was designed with new criteria and with the no-compromise philosophy which differentiate all STS creations.

The result is a head with exceptional features, capable of satisfying the most demanding customers.

Herewith are some of these features:

Rotating movement of the two axes controller by brushless TORQUE motors direct, which means 1 motor turn 1 axis turn; total absence of gaps

Axes support on pre-loaded bearings of large sizes always direct 1/1; complete absence of gaps

Position optical transducers with encoder at very high resolution assembled directly on the rotating devices, also direct 1/1; complete absence of gaps.

Hydraulic lock of the two axes.

• Max torque main axis with locked axes 2.500 Nm

• Max. torque secondary axis with locked axes 2.500 Nm

• Max torque main axis with unlocked axes 1.600Nm

• Max torque secondary axis with unlocked axes 1.600Nm

• Torque of main axis in continuous work (S1)800Nm

• Torque of secondary in continuous work (S1)  800Nm

• Continuous rotation, illimited in 1° axis +190° -190°

• Rotation of the 2° axis +95° -140° (50° undercut)

• Power for spindle motor max possible to be installed 140kW

• Max torque spindle possible to be installed 850Nm

• Structure in cast iron

• Automatic locking of the tool

• Cooling of the nozzles

• Cooling of taper centre ( optional)

• Cooling high pressure (optional)

• Air on nozzles (optional)

The continuous head with 2 axes, for each rotation axis, is formed by two parts that rotate in an independent movement, one compaired to the other.

The first axis, also called main or dragging as it drags the second axis, has the fixed part supportive with the carriage of the vertical axis.

The moving part is supportive with the fork that is the base for the second axis which is also called secondary or dragged.

The secondary axis has the fixed part supportive with the force and the rotating part transmits the movement to the housing of the electro-spindle.

All the motors are cooled with liquid that circulates in specific windings put around the axis motors, the spindle motors and the bearings of the spindle itself.

This liquid is taken from the refrigerating tank which equips the machine and conveyed in the same tank at the exit of the motors. This allows to have a lapse rate between the head and the atmosphere temperature even during the most difficult uses.

The thermal probe (3 in the motor of the main axis, 3+3 in motors of the secondary axis and 3 in the electro-spindle) allow to check instantly the temperature in each area.

The main axis is super symmetric compaired to its centre of rotation, to the secondary axis and to the electro-spindle. Therefore it is geometrically stable during the temperature variation and it is set so that possible thermal drifts can produce extensions towards the back part of the axis; this does not change the dimensional stability and precision of the machined piece.

The system with double bearing allows a great rigidity both on the rotation surface of the axis and on the endless slanting guiding principles that can occur, being a continuous head.

The secondary axis is super symmetric compaired to its centre of rotation and to the spindle; therefore it is geometrically stable during the temperature variation and it is set so that possible thermal drifts can produce extensions towards the two parts outside the axis; this does not change the dimensional stability and precision of the machined piece.

In particular the conformation with double motor, avoids deformations caused by lapse rates, it also eliminates the problem which would occur in dynamics and in particular in finishing and super-finishing acceleration.

The system with quadruple bearing, two for each side, allows a great rigidity both on the rotation surface of the axis and on the endless slanting guiding principles that can occur, being a continuous head.

Even with large dimensions, the head has an excellent capability of penetration thanks to the important type of bouncing from the point of the spindle to the sides of the head.

It is superior to those of many machines with horizontal or vertical fixed spindle.

The cables, all of last generation resistant to oils and chemicals, are positioned so that they react to the rotations of the axes with bendings along the wire guiding and not with torsions around its own axis.

This allows them a long life.

The oils, the fluids and the pneumatics are set in rotating distributors over dimensioned for working pressure and rotating speed, and this also allows to lengthen the wear life and reduce the maintenance.

The encoders, the motors, the bearings and the spindle are pressurized with micro-filtered air so that the impurities cannot penetrate and cause damages.

In conclusion this head:

• Allows to rough with great power (high static rigidity).

• Allows to position with great precision (detection with great resolution and direct).

• Allows to finish and super-finish with 5 axes with high speed and high dynamics (powerfull and direct motors).

• It is precise and stable also on long machinings thanks to thermal stability.

• It is repeatable in time thanks to the absence of any mechanical device, which can gain gaps.

• It has great capability of penetration thanks to an important bounce between the point of the spindle and the heads sides.

• It has great reliability in time and needs very little maintenance based on all the design precautions..

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Ultimo aggiornamento: 27-11-09