| Zugriffsnummer | 35152 |
| Dokumenttyp | Konferenzartikel |
| Peer Review | unbekannt |
| Sprache | Englisch |
| Titel | Reliable measurements of the diametrical dimension over balls |
| Autor(in); Institution |
Wedmann, Achim; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
Kniel, Karin; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
Stein, Martin; 5.3, Koordinatenmesstechnik, PTB-Braunschweig
Härtig, Frank; 1, Mechanik und Akustik, PTB-Braunschweig
|
| Quelle/Jahr | International Conference on Gears:(2015) |
| Schriftenreihe | VDI-Berichte: 2255 |
| Availability | [CD-ROM] |
| ISBN | 978-3-18-092255-3 |
| Verlag | Düsseldorf: VDI-Verlag |
| Konferenzangaben | International Conference on Gears 2015, Garching, 05-07, October, 2015, Germany |
| Freie Schlagworte | gear metrology ; diametrical dimension over balls ; self-centering probing ; probe quantification ; gap measurement artifact |
| Zusammenfassung | Due to very high accuracy requirements placed on gears, measurements of the manufactured parts during the production process are indispensible. Often tactile measuring instruments are used, since they provide highest accuracy and universal properties. For the diametrical dimension over balls, the measurement points are determined in two opposite tooth spaces in double-flank contact. In the following, this process is referred to as gap measurement. In order to compensate systematic errors from the measuring process the substitution method can be used. This method offers a practical application for reducing the measurement uncertainty by comparison measurements with a calibrated measurement standard which is similar to the workpiece in form and dimension. In general, gap measurements are performed in the self-centering probing mode. In order to keep the measurement uncertainty as small as possible, the exact knowledge of the probe condition and the surveillance of the sensitive probing process in the gap are necessary. In addition to the quality of the gear, also stability and characterization of the probing system are crucial points. The common measuring routines in coordinate metrology use single-point contacts to describe the probe characteristics. However, in this particular measurement task the stylus is in double-flank contact. The occurring forces result in elastic deformations and significant length measuring deviations. In addition, wear and tear or adhesions of dirt are often detected only insufficiently and are, thus, not taken into account in the measuring process. In order to check any length measuring deviations resulting from this by a probe or a probe configuration, a novel measurement standard, the so-called gap measurement standard, has been developed at PTB. The principle of the gap measurement standard is that at least two (or four) calibrated precision balls are arranged on a thermally invariant base plate in such a way that one (or two) gaps are formed. The diameter and the distances of the balls can be calibrated with small measurement uncertainties by means of a laser-interferometric measuring system. Using this measurement standard, the important parameters of the probe characteristic for gap measurements are detected and the influences from the self-centering probing process are compensated. In this article, the most important probe influences by measuring the diametrical dimension over balls are discussed, and solutions for a reduction of the uncertainty components are shown. |
