Siemens Aktiengesellschaft

Tom Tolkmitt

Klaus Hertinger

Peter Bauer

Andreas Uhlich

Heino De Levie

Curd Weber

Horst Stiehler

Jürgen Müller

Albrecht Speck

A method for avoiding an unwanted collision between a tool and a workpiece in a machine tool is disclosed, wherein when a parts program starts to run, the determination of setpoint movement values for controlling a relative movement between tool and workpiece is started based on the parts program and a determination of the material removal at the workpiece by the tool is started based on the determined setpoint movement values. It is then checked whether a tool model overlaps with a workpiece model. When an overlap is detected, the relative movement between tool and workpiece is slowed down until the relative movement stops. A related facility employing the method for controlling a machine tool is also disclosed. Unwanted collisions between a tool and a workpiece in a machine tool can thus be avoided, while attaining short machining times for the workpiece.

Method for avoiding an unwanted collision between a tool and a workpiece in a machine tool

A method for controlling several master axes in a machine, for example a production machine includes the steps of defining profiles of desired values for a plurality of master axes, determining for each master axis a current desired value and also a current desired value for a slave axis using a logic combination rule, controlling a first drive in accordance with the current desired value of the slave axis, and if the dynamics controlling the first drive exceeds an upper dynamics limit, starting at the next clock pulse to modify determination of the current desired values for at least one of the master axes, and controlling the first drive with a reduced dynamics until the reduced dynamics falls below a lower dynamics limit.

Controlling a slave drive with dynamic determination of the dynamics of the master axis

A control device for controlling a machine tool which can be used to drive tools includes a memory for storing a movement limit value which is respectively assigned to the tools and is specific to the respective tool. A desired value generating unit generates desired values for controlling the movement of the tool. The desired values are limited by a limiting unit on the basis of the assigned movement limit value in such a manner that the movement limit value is not exceeded when moving the tool.

Control device for controlling a machine tool which can be used to drive tools

A method for controlling the rotation speed of a slave drive is described, where a reference rotation speed and a reference position is provided to a controller. The controller determines an estimated acceleration curve for the slave drive based on an instantaneous rotation speed, an instantaneous position and a maximum rotation-speed-dependent acceleration of the slave drive. The estimated acceleration curve for the slave drive is hereby determined so that after a compensation time, the rotation speed of the slave drive is equal to the reference rotation speed and the position of the slave drive is also equal to an expected reference position, which is determined by the controller based on the reference position, the reference rotation speed and the compensation time.

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Fürth, Germany

Tom Tolkmitt