Walter Ag

Walter Maschinenbau Gmbh

Thomas Engelfried

Christian Dilger

Heinz Häckh

A method for calibration of grinding and/or erosion machines assumes an initial calibration process and corresponding re-calibration processes. Calibration of the machine is performed with a reference piece and a reference tracer in an initial calibration process. Grinding tests follow the first tracing process from all directions during which tests deviations are determined and made ineffective with the iterative procedure. The machine-internal measuring system is calibrated immediately after performing the machining tests and thereby immediately after the initial referencing of the machining apparatus whereby the machine tracer and a test piece is traced from all coordinate directions and the resulting position values are stored. Subsequent re-calibrations supply measured values, which are compared to the stored values whereby correction values are determined then from the deviations for additional machining of workpieces.

Calibration procedures and such using an erosion and grinding machine

A machine for machining a workpiece with at least one revolving or rotating tool has a work spindle with a shaft (), whose temperature is monitored by means of at least one temperature sensor (). The temperature sensor is detected in contactless fashion. The sensor () is preferably a radiation-sensitive sensor, which detects the temperature radiation output. by the shaft (). In triggering the positioning drive mechanisms, the control unit () of the machine () takes into account the temperature expansions of the shaft () that result from the temperature changes in the shaft. The positioning drive mechanisms serve to position a tool (), carried by the shaft (), relative to the workpiece (). A machining precision is thus achieved that is independent of the temperature and temperature changes of the machine () overall, of temperature changes in the coolant&#x2014;lubricant, and of temperature changes in the tool () and the shaft (), that can all be caused by the power converted at the machining site.

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Baltmannsweiler, Germany

Thomas Engelfried