EN ISO 25178
DIN EN ISO 25178 | |
---|---|
Area | Geometrical product specification (GPS) |
title | Surface quality: flat |
Brief description: | see text |
Latest edition | 2010-2018 |
ISO | 25178 |
The DIN EN ISO 25178 series of standards deals with surface roughness measurement . This allows a large number of new evaluations to better describe the functions of the surface.
This standard was drawn up by the Technical Committee TC213 of the WG16 working group of ISO .
It is the first international standard to take into account the measurement and specification of 3D surface textures. In detail, the standard defines 3D texture parameters and the associated operators for their determination. It also describes the applicable measurement technology, calibration methods and physical calibration standards, as well as the calibration software required for this.
A fundamentally new component of the standard is the coverage of non-contact measurement methods, which are already widespread in industry, but which previously lacked a standard to carry out quality audits according to EN ISO 9001 . For the first time, the standard introduces 3D surface characterization in areas in which 2D profilometers have been standardized by standards for over 30 years. The same applies to the associated surface metrology, which is not limited to mechanical scanning processes, but also includes confocal microscopes or interferometers .
DIN EN ISO 25178 - parts
This standard is divided into the following parts:
- Part 1: Specification of surface properties (as of December 2016)
- Part 2: Terms and surface parameters (as of September 2012)
- Part 3: Specification operators (deals with the default settings of the filters, as of November 2012)
- Part 6: Classification of methods for measuring surface quality (as of June 2010)
- Part 70: Measuring standards (as of June 2014)
- Part 71: Software standards (as of January 2018)
- Part 72: XML file format x3p (definition of the XML file format x3p for storage and exchange of profile and topography data, as of November 2017)
- Part 600: (Draft) Metrological features for surface topographical measurement methods (Draft from June 2017)
- Part 601: Features of contact measuring devices (with button) (as of January 2011)
- Part 602: Features of non-contact measuring devices (with chromatic confocal probe ) (January 2011)
- Part 603: Features of non-contact measuring devices (phase-shifting interferometric microscopy ) (February 2014)
- Part 604: Features of non-contact measuring devices ( white light interferometry ) (as of December 2013)
- Part 605: Features of non-contact measuring devices (point autofocus sensor) (as of June 2014)
- Part 606: Features of non-contact measuring devices ( focus variation ) (as of December 2016)
- Part 607: Features of non-contact measuring devices ( confocal microscopes ) (as of March 2019)
- Part 701: Calibration and standards for contact measuring devices (with button) (January 2011)
Parameters in EN ISO 25178-2
This part deals with the possible parameters. These include:
- Height parameters
- Spatial parameters
- Hybrid parameters
- Functions and related parameters
- Mixing parameters
Methods in EN ISO 25178-6
Part 6 of the series of standards deals with the available methods for measuring roughness, e.g. B.
- Profile method (see DIN EN ISO 25178-601)
- Phase shift interferometry
- Interferometric roundness profile measurement
- Optical differential profilometry
- Coherent scanning interferometry
- Confocal microscopy
- Chromatic confocal microscopy (see DIN EN ISO 25178-602)
- Strip light projection
- Focus varying microscopy
- Digital holographic microscopy
- Point autofocus profilometry
- Angle-resolved scanning electron microscopy
- SEM stereoscopy
- Scanning tunneling microscopy
- Atomic force microscopy
- Totally integrated spread
- Angle resolving scattering
- Parallel plate capacity method
- Pneumatic measuring system
Roughness value S a
EN ISO 25178 defines the surface-related roughness value using the arithmetic mean :
where is the considered surface and the profile height. The profile height and its integral are measured using the methods mentioned above.
Web links
- ISO / TC 213 - Dimensional and geometrical product specifications and verification. In: Standards catalog on the ISO website. ISO, accessed on June 29, 2016 (English, also contains the ISO 25178 standards with links to details and indirect access to the table of contents of the individual standards).
- DIN EN ISO 25178-2: 2012-09 - Geometrical product specifications (GPS) - Surface quality: Areal - Part 2: Terms and surface parameters. German version EN ISO 25178-2: 2012. In: Webshop. Beuth Verlag , accessed on June 29, 2016 (an example of access to the German version of a standard, online only the table of contents can be accessed freely).