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Measurement technology for the machine-integrated determination of form deviations in optical surfaces

: Schmitt, R.; Doerner, D.; Pfeifer, T.


CIRP Annals. Manufacturing Technology 55 (2006), No.1, pp.559-562
ISSN: 0007-8506
Journal Article
Fraunhofer IPT ()

Quality inspection of ultra precise mold inserts is conducted outside the manufacturing machine by using phase-shifting interferometers (PSI). Reworking or a local correction of form deviations is difficult, because the mold inserts have to be repositioned in the machine tool. A promising way to overcome this problem is the machine-integration of the measurement system. But due to the sensitivity of PSI methods a direct integration into the machine tool is possible only to a limited extend. A FFT-based measurement technique was developed with reduced sensitivity. It was applied in a injection molding machine for form testing of a clamped mold insert with 80 degrees C process temperature.