Dr. Johannes Heidenhain Gmbh

Johannes Heidenhain Gmbh

Frieder Kohler

Matthias Fauser

Norbert Kerner

Alfons Baumgartner

Andreas Balleisen

Josef Schoenhuber

Stefan Maier

Berhard Wastlhuber

Martin Pohl

Josef Schönhuber

In a method for controlling a milling machine, a milling operation is able to be monitored on the basis of a temporally variable parameter of a numerical control in that the parameter is monitored for the exceeding or undershooting of a limit value during the milling operation. The method includes filtering out the tooth-meshing frequency in the time characteristic of the parameter (Iqnom).

Method and device for controlling a milling machine

A numerical control for operating a machine tool having a plurality of axes, includes a drive controller for each axis to be actuated, the drive controllers being able to be parameterized via machine parameters and thus adaptable to the most varied applications. Variable control values and machine parameters are selectable via tapping points in the drive controllers in order to be used as arguments or parameters of a user-defined function for calculating an output value, which is used for function-dependent influencing of one of the drive controllers.

Numerical control

A controller structure for more than two drive units coupled mechanically to a movable element includes a position measuring device for determining an actual position of the movable element and a position controller for calculating a setpoint speed from a setpoint position and the actual position, the position measuring device and the position controller jointly serving all drive units. Each drive unit, however, has a speed controller of its own. The drive units are configured either as master or as slave, individual drive units also being able to assume both functions. A torque-master-slave controller ensures a compensation of the torques between the drive units.

Controller structure for multiple mechanically coupled drive units

Based on the realization that, at the instant a holding brake in the drive of a machine tool is actuated, it may not be necessary to precisely observe the setpoint values, it may be provided to adapt control parameters in the controller of the drive such that, given an engaged holding brake, oscillations may be avoided or substantially reduced. By applying a correction value to the controller, it may be possible to prevent the adaptation of the control parameters from resulting in a change at the output of the controller.

Method for actuating a holding brake

A position transducer is connected to merely one input circuit. The outputs of the input circuit are connected, transmitted or routed, in part, to a first and to a second counter circuit. For the counting process, the first counter circuit uses the digital signals of the input circuit, while the second counter circuit generates digital signals from the analog signals and uses them for the counting process. It is, thus, possible, in spite of a not fully two-channel processing of the signals of a position transducer, to set up a reliable position monitoring using only one position transducer.

Device for reliable position monitoring

A method for generating nominal position values for a position control loop of a numerically continuous-path controlled machine. The method includes presetting nominal position values with a defined interpolator clock rate, digitally filtering the preset nominal position values and transmitting the digitally filtered nominal position values to a position control loop, which with them controls motion of a machine on a path curve at a defined position control clock rate. Adjusting the digitally filtering nominal position values as a function of dynamic characteristics of the machine and adjusting an interpolator clock rate as a function of the dynamic characteristics of the machine.

Method and circuitry for producing nominal position values for a closed loop position control of a numerically continuous-path controlled machine

An arrangement for generating command variables for control loops of a numerically controlled machine that includes an interpolator unit for providing position set points with a defined interpolator scanning rate and a precision interpolator unit. The precision interpolator unit includes a scanning rate converter and a downstream-connected low-pass filter, wherein the precision interpolator unit is arranged downstream of the interpolator unit, which generates command variables at an output side from position set points at an input side for one or several downstream-connected control loops, wherein the precision interpolator unit generates command variables in a time pattern of the control loops with a control loop scanning rate.

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Lauter, Germany

Frieder Kohler