ISO 13565

ISO 13565. It is an international standard from the International Organization for Standardization that specifies the evaluation of surface texture for surfaces possessing stratified functional properties, such as those produced by honing or plateau honing. The standard is part of the broader Geometrical Product Specifications framework and addresses the need to characterize surfaces where deep valleys and a fine plateau coexist, which is critical for functions like lubrication retention and load-bearing capacity. Developed by technical committee ISO/TC 213, it provides a method based on filtering the measured profile to separate and analyze these different strata independently.

Overview

The standard was developed to address the limitations of traditional surface roughness parameters, like those defined in ISO 4287, when applied to complex surfaces common in high-performance engineering. Such surfaces, often created by processes like honing or laser texturing, feature a plateau of fine texture above deeper valleys or grooves. The methodology within this standard uses a robust filtering technique, the *Rk family* of parameters, to differentiate between the upper plateau and the lower valley components of the surface. This allows engineers and metrology professionals to obtain a more functionally relevant description of the surface, which is crucial for predicting performance in applications involving friction, wear, and lubrication.

Parts of the standard

The standard is divided into multiple parts, each detailing a specific aspect of the characterization process. Part 1 provides the general introduction and defines the terms and concepts related to surfaces having stratified functional properties. Part 2 specifies the procedure for calculating height characteristics based on the linear material ratio curve, which is central to deriving the *Rk* parameters. Part 3 describes the methodology for calculating material probability curves, offering a statistical approach to surface characterization. These parts work in conjunction with other foundational GPS standards, such as ISO 3274 for instrument characteristics and ISO 4288 for rules and procedures for profile assessment.

Surface texture parameters

The core of the standard introduces a set of parameters derived from the material ratio curve, also known as the Abbott-Firestone curve. The key parameters include *Rk* (core roughness depth), *Rpk* (reduced peak height), and *Rvk* (reduced valley depth). *Mr1* and *Mr2* are the material ratios that define the boundaries of the core roughness profile. These parameters provide a quantitative description of the plateau's load-bearing capability and the valleys' capacity to retain lubricant or debris. This analytical framework is a significant advancement over simple amplitude parameters like Ra or Rz, as defined in ISO 4287.

Applications

This standard is critically applied in industries where surface functionality directly impacts product life and performance. The primary field is automotive engineering, particularly for characterizing cylinder liners, crankshaft journals, and piston ring surfaces manufactured by plateau honing. It is also essential in the aerospace industry for evaluating bearing surfaces and in hydraulics for assessing the seals and pumps. The parameters help in quality control during manufacturing at companies like Volkswagen or Bosch, and in research at institutions like the Physikalisch-Technische Bundesanstalt.

Relationship to other standards

ISO 13565 is an integral component of the Geometrical Product Specifications system developed by ISO/TC 213. It specifically complements ISO 4287 (surface texture terms and parameters) and ISO 4288 (profile method rules). Its filtering and evaluation concepts have influenced later standards, including parts of the ISO 25178 series for areal surface texture measurement. The standard also interfaces with national standards, such as those from DIN in Germany or ASME in the United States, ensuring global harmonization in surface metrology practices for critical engineering components.

Category:ISO standards Category:Metrology Category:Engineering terminology