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Metoda badania dokładności sond impulsowych w obrabiarkach CNC z zastosowaniem wzorca przestrzennego

Michał Jankowski

Abstract

In this PhD thesis a method of testing touch trigger probes for CNC machine tools, based on using a moving spatial master artifact is presented. This method allows to determine the uni-directional repeatability, the triggering radius variation and the average triggering ra-dius of the tested probe. The proposed method can be realized by the use of a small, lightweight, portable setup which allows to perform tests both in a laboratory as well as in the workspace of a machine tool, without dismounting the probe from the spindle. This allows to significantly shorten the time during which the probe is excluded from work. An example of a practical realization of the developed method is the built measure-ment setup which allows to use exchangeable master artifacts of various shapes. An inner hemisphere shaped master artifact is used to test the spatial characteristics of probes, a gauge ring is used to test characteristics in the surface perpendicular to the probe's axis, and for test-ing of the characteristics in the surfaces containing the probe's axis - a ring shaped artifact with a cut along the side. The values of uncertainty for determining the tested parameters were calculated separately for two dimensional and three dimensional master artifacts. In or-der to verify the operation of the setup, there were performed comparative tests in stabilized laboratory conditions and directly in an industrial environment, where the probe was tested in a machine tool's workspace, using various master artifacts. The measurements performed with the use of the setup are automated to a high degree thanks to the use of a program written in the LabVIEW environment, which controls the oper-ation of the setup, determines the values of the tested parameters and allows the numerical correction of the master artifact's surface form deviations. The developed and built measurement setup was used to test a number of touch trigger probes of various operating principles. Based on the results it was concluded that a significant factor influencing the operation of the probes for CNC machines is the delay resulting from processing and the wireless transmission of the triggering signal. Based on this, the theoretical model which describes the operation of probes for coordinate measuring machines was modi-fied so that it also describes the operation of probes for CNC machine tools. In the thesis it was also showed that, from a probe user's point of view, the triggering radius variation, which refers only to the triggering points, is a parameter more important than the pre-travel variation, which is also influenced by the measuring tip's neutral position.
Record ID
WUTd808ec738b0d448d86b46fcd36be9280
Diploma type
Doctor of Philosophy
Author
Title in Polish
Metoda badania dokładności sond impulsowych w obrabiarkach CNC z zastosowaniem wzorca przestrzennego
Language
(pl) Polish
Certifying Unit
Faculty of Mechatronics (FM)
Discipline
mechanical engineering / (technology domain) / (technological sciences)
Status
Finished
Start date
14-11-2014
Defense Date
17-11-2014
Title date
26-11-2014
Supervisor
Internal reviewers
Eugeniusz Ratajczyk Eugeniusz Ratajczyk,, Faculty of Mechatronics (FM)
External reviewers
Jerzy Sładek, prof. Jerzy Sładek, prof. ,, External affiliation of publication: Politechnika Krakowska im. Tadeusza Kościuszki
Pages
136
Keywords in English
trigger probes for CNC machine tools
Abstract in English
In this PhD thesis a method of testing touch trigger probes for CNC machine tools, based on using a moving spatial master artifact is presented. This method allows to determine the uni-directional repeatability, the triggering radius variation and the average triggering ra-dius of the tested probe. The proposed method can be realized by the use of a small, lightweight, portable setup which allows to perform tests both in a laboratory as well as in the workspace of a machine tool, without dismounting the probe from the spindle. This allows to significantly shorten the time during which the probe is excluded from work. An example of a practical realization of the developed method is the built measure-ment setup which allows to use exchangeable master artifacts of various shapes. An inner hemisphere shaped master artifact is used to test the spatial characteristics of probes, a gauge ring is used to test characteristics in the surface perpendicular to the probe's axis, and for test-ing of the characteristics in the surfaces containing the probe's axis - a ring shaped artifact with a cut along the side. The values of uncertainty for determining the tested parameters were calculated separately for two dimensional and three dimensional master artifacts. In or-der to verify the operation of the setup, there were performed comparative tests in stabilized laboratory conditions and directly in an industrial environment, where the probe was tested in a machine tool's workspace, using various master artifacts. The measurements performed with the use of the setup are automated to a high degree thanks to the use of a program written in the LabVIEW environment, which controls the oper-ation of the setup, determines the values of the tested parameters and allows the numerical correction of the master artifact's surface form deviations. The developed and built measurement setup was used to test a number of touch trigger probes of various operating principles. Based on the results it was concluded that a significant factor influencing the operation of the probes for CNC machines is the delay resulting from processing and the wireless transmission of the triggering signal. Based on this, the theoretical model which describes the operation of probes for coordinate measuring machines was modi-fied so that it also describes the operation of probes for CNC machine tools. In the thesis it was also showed that, from a probe user's point of view, the triggering radius variation, which refers only to the triggering points, is a parameter more important than the pre-travel variation, which is also influenced by the measuring tip's neutral position.
Thesis file
  • File: 1
    praca_doktorska_Michal_Jankowski.pdf
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Citation count
2

Uniform Resource Identifier
https://repo.pw.edu.pl/info/phd/WUTd808ec738b0d448d86b46fcd36be9280/
URN
urn:pw-repo:WUTd808ec738b0d448d86b46fcd36be9280

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