British Standards Institution

Source:: ISO
Committee:: MCE/7 - Rolling bearings
Categories:: Information management | Standardization. General rules | Engineering | Mechanical systems and components | Bearings | Bearings. General

Scope

Establish a common vocabulary for finished silicon nitride rolling elements surface imperfections, along with descriptions and characteristics, and provide example pictures of specified surface imperfections. Rolling elements stands for balls and rollers. Imperfections defined in this document correspond to patterns found on finished rolling elements before use. Deviations from the geometric product specifications (GPS) are not dealt with in this document. This document does not give criteria for the acceptance limits of these imperfections. The identification of an imperfection is done by the different actors involved in the manufacturing, mounting or final using of the silicon nitride parts, depending on the technical specifications and the criticality of the application.

Purpose

In ISO 26602 (ISO equivalent of the ASTM F2094 (balls) and F2730 (rollers)), there is no paragraph related to imperfections. Practically, silicon nitride element suppliers, bearing manufacturers and final customers do not use the same definition for imperfections.The aim of this new standard is to agree on a common vocabulary for all imperfections found on silicon nitride rolling elements, without giving criteria for acceptability of these indications. This is done in order to make communication between all the partners easier and more efficient.Acceptability criteria are typically defined in the specifications of final customers and/or bearing suppliers and/or silicon nitride part manufacturers depending on the applications.

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Please email further comments to: debbie.stead@bsigroup.com

Standard timeline

1. Proposal

Proposal start date:

14/04/2022

Proposal end date:

05/06/2022

2. Draft

3. Public Comments

4. Comment Resolution

5. Approval

6. Publication

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Standards Development

ISO/PWI 3643 Rolling bearings â Definitions of imperfection of silicon nitride rolling elements

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