Position measuring device and method for correcting thermal expansion, in particular in a processing machine, and a processing machine, in particular a machine tool
AssigneeDr. Johannes Heidenhain GmbH
InventorsMartin Seichter, Andreas Hager
Life of this patent
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Abstract
A position measuring device that includes a first element having a material measure and a temperature measuring unit with a sensor, the temperature measuring unit is unable to be displaced relative to the material measure. A second element having a scanning head, and an electronic correction device that determines a temperature-corrected position value, wherein the first element is displaced in relation to the second element.
Claims19
A position measuring device, comprising:
- a first element comprising:
- a material measure;
- and
- a temperature measuring unit comprising a sensor, said temperature measuring unit is unable to be displaced relative to said material measure;
- a second element comprising:
- a scanning head;
- and
- an electronic correction device that determines a temperature-corrected position value;
- and
- wherein said first element is displaced in relation to said second element.
A method for position measurement by a position measuring device comprising a first element and a second element, wherein said first element is displaced in relation to said second element in a measuring direction, the method comprising:
- activating a sensor of a temperature measuring device extending along said measuring direction in said first element, for determining a temperature of said sensor;
- determining an uncorrected position of a scanning head assigned to said second element in relation to a material measure assigned to said first element;
- and
- correcting said determined uncorrected position of said scanning head relative to said material measure, based on said determined temperature of said sensor.
A processing machine, comprising:
- a first machine element;
- a second machine element that is displaced relative to said first machine element;
- a position measuring device, comprising:
- a first element attached to said first machine element so as to being unable to be displaced relative to said first machine element, said first element comprising:
- a material measure;
- and
- a temperature measuring unit comprising a sensor, said temperature measuring unit is unable to be displaced relative to said material measure;
- a second element fixedly connected with said second machine element so as to being unable to be displaced relative to said second machine element, said second element comprising:
- a scanning head;
- and
- an electronic correction device that determines a temperature-corrected position value;
- and
- wherein said first element is displaced in relation to said second element.
Dependencies are inferred from the claim text.