Overview
SIST EN ISO 16610-22:2026 is an international standard developed by CEN, focusing on Geometrical Product Specifications (GPS) - Filtration - Part 22: Linear profile filters: Spline filters. This standard defines the use and implementation of linear spline filters for the filtration of surface profiles. The aim is to provide a consistent approach to separating large-scale and small-scale lateral components within surface profiles, which is crucial for accurate surface analysis and control in quality assurance processes.
Spline filters, as described in this standard, play a significant role in the field of surface metrology. They allow for the precise separation of different scales of surface features, facilitating improved measurement and analysis in manufacturing, research, and quality control environments. The methodologies specified can be applied to both open and closed profiles, such as those encountered in roundness measurements.
Key Topics
- Definition of Linear Spline Filters: The standard establishes the theoretical and practical framework for linear spline filters, distinguishing how they operate on surface profiles by separating large- and small-scale components.
- Application to Open and Closed Profiles: The concepts are applicable not only for open profiles but also for closed profiles, with particular relevance to roundness filtration.
- Profile Component Separation: Details are given on how the spline filter algorithm decomposes a profile into its constituent parts, enhancing the evaluation of surface characteristics.
- Transmission Characteristics: The standard explains the transmission characteristics for both large-scale and small-scale components, a critical aspect for filter selection and implementation.
- Tension Parameter (β): The influence of the tension parameter is highlighted, providing users with flexibility to adjust the filter’s behavior according to the specific application requirements.
- Filter Designation: A specific designation system (FPLS) for spline filters is introduced for clarity and standardization in documentation and communication.
Applications
The practical applications of SIST EN ISO 16610-22:2026 span various sectors that require precise surface measurement and filtration, including:
- Quality Control in Manufacturing: Spline filters are utilized to ensure surface finishes meet stringent specifications by removing unwanted scales of surface texture or form, relevant in industries like automotive, aerospace, and precision engineering.
- Roundness and Form Measurement: The extension of spline filter concepts to closed profiles is particularly useful for roundness assessment, commonly applied in the measurement of cylindrical and spherical components.
- Metrology and Surface Analysis: Laboratories and R&D settings benefit from standardized filtration methods when conducting comparative studies or ensuring measurement traceability.
- Surface Texture Characterization: Detailed analysis of machined, ground, or turned surfaces leverages spline filtration to isolate process signatures and effects of tool wear.
In Annex A of the standard, concrete examples illustrate the spline filter’s application to varied surface profiles, while Annex B demonstrates the effect of adjusting the tension parameter on the filter’s performance.
Related Standards
For comprehensive understanding and correct implementation, SIST EN ISO 16610-22:2026 references and complements several other important standards:
- ISO 16610-1:2015: Geometrical product specifications (GPS) - Filtration - Part 1: Overview and basic concepts
- ISO 16610-20:2015: GPS - Filtration - Part 20: Linear profile filters: Basic concepts
- ISO 16610-21: Linear profile filters: Gaussian filters
- ISO/IEC Guide 99: International vocabulary of metrology - Basic and general concepts and associated terms (VIM)
Together, these standards form an integrated approach to surface profile filtration, offering a robust framework for surface metrology, profile filtering, and geometric product specification tasks.
By adhering to SIST EN ISO 16610-22:2026, organizations can achieve better measurement reliability, clearer communication of specifications, and enhanced product consistency in line with international best practices.
