Fidia at the 2004 BIEMH

The search for precision is an ongoing process in the workshops dealing with the metal. Customers demand ever lower tolerances in the machined parts. Often the response to this need is in the machine tool used for machining. But the machine, as the same cutting tool, is prone to deteriorate with the passage of time.

In most of the machining centers and milling conventional 3 axis, the deterioration can offset relatively easy with the use of managed by the numerical control devices that guide with precision by means of orders the linear displacement of the machine. However, for machines that have more than 3 axles and specifically for those who use bi-rotativos heads, the calibration process is more complicated.

Design of machining centres equipped with bi-rotativos head implies that any inaccuracy of the machine are underscores even more, since the end of the tool is relatively far from the moving parts of the machine. Any deviations from tolerances is multiplied by the distance and the accumulation of errors resulting from the setting in the combination of multiple axes.

Usually the method required for the verification of a cuatro-cinco head rotating bi-axis machining center involves the use of sophisticated ground-based interferometers lasers and loss of productive time to correct the deviation of the axis due to wear or other causes. In the vast majority of the workshops this calibration is carried out by subcontractors.

Fidia will present a new device for measuring and calibration for machines equipped with bi-rotativos heads. The device has been developed to solve the problem of calibration in the 5-axis heads in general: added value for the numeric controls Fidia, available also in their machining centers.

The objective of Fidia with this new development is to establish a simple, automated process in the correction of the bi-rotary heads, and can be used for simple and easy way for the operator of the machine when deemed necessary. The cycle of calibration, configurable according to the type of head and the requirements of the user, uses a maximum of 40 minutes for a full calibration and minutes for the measurement of specific axes. It can be used by inexperienced personnel through a simple interface and fast implementation of measurement and calibration of automatic cycles.

For its operation, you must set the HMS device on the desk of the machine comfortable through some magnets. Then, you must activate the interface and move the machine until the pattern tool hosted on the mandrel makes contact with the three sensors of the device.

From this moment, cycle calibration for the centered car is done via automatic procedures of control numeric (the cycle time is 10 minutes). During this cycle of auto-centrado CNC recognizes the position of the field of the tool pattern according to the information received from the sensors. Once this cycle, the machine is ready for its measurement and calibration.

Automated cycles included in the software of CNC Fidia algorithms allow, through a series of checks, determine any deviations from the tolerance of the axes. The CNC made, in this case, the necessary compensation and shows the graphs in real-time what is happening in the cycle. For any analysis or additional documentation, the numerical control can generate reports of investigations and corrective actions. The range of precision of this measurement system is comparable to the retrieved using laser interferometers.