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GB/T 42539-2023 English PDF

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US$544.00 · In stock
Delivery: <= 5 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 42539-2023: Rolling bearings - Ceramic bearings balls - Determination of the strength by notched ball test
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 42539-2023	544	Add to Cart	5 days	Rolling bearings - Ceramic bearings balls - Determination of the strength by notched ball test	Valid

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Basic data

Standard ID: GB/T 42539-2023 (GB/T42539-2023)
Description (Translated English): Rolling bearings - Ceramic bearings balls - Determination of the strength by notched ball test
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: J11
Classification of International Standard: 21.100.20
Word Count Estimation: 29,294
Date of Issue: 2023-05-23
Date of Implementation: 2023-12-01
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 42539-2023: Rolling bearings - Ceramic bearings balls - Determination of the strength by notched ball test

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
ICS 21:100:20 CCSJ11 National Standards of People's Republic of China Ceramic balls for rolling bearings Strength determination (notched ball test) bynotched baltest (ISO 19843:2018, IDT) Released on 2023-05-23 2023-12-01 Implementation State Administration for Market Regulation Released by the National Standardization Management Committee

foreword

This document is in accordance with the provisions of GB/T 1:1-2020 "Guidelines for Standardization Work Part 1: Structure and Drafting Rules for Standardization Documents" drafting: This document is equivalent to ISO 19843:2018 "Determination of Strength of Ceramic Balls for Rolling Bearings (Notched Ball Test)": Please note that some contents of this document may refer to patents: The issuing agency of this document assumes no responsibility for identifying patents: This document is proposed by China Machinery Industry Federation: This document is under the jurisdiction of the National Rolling Bearing Standardization Technical Committee (SAC/TC98): This document is drafted by: Luoyang Bearing Research Institute Co:, Ltd:, Jiangsu Lixing General Steel Ball Co:, Ltd:, Renben Co:, Ltd: The main drafters of this document: Zhang Bowen, Wen Chaojie, Sha Xiaojian, Liu Bin, Du Xiaoyu:

Introduction

To determine the strength of a part, test specimens are usually specially prepared and subjected to a bend test: The measured value of the standard sample in the ceramic bending test can only be converted into the measured value of the common sample under limited conditions: Since the surface accuracy of the ceramic ball is not changed, the notched ball test can be used as a part test for quality control: In addition, the processing and The impact of usage can also be quantified: This test is applicable to process improvement and material research and development, quality assurance, description and selection of material characteristics, and determination of design parameters: ceramics The determination of the ball strength value is carried out under the following conditions: a) the material has linear elasticity (stress-strain relationship); b) The material is homogeneous and isotropic: This test is carried out in a laboratory with precision processing equipment, measuring instruments and testing machines: The processing of the notch and the measurement of parameters are performed by experienced Rich operators do it carefully: Ceramic balls for rolling bearings Strength determination (notched ball test)

1 Scope

This document specifies the method for measuring the strength of finished ceramic balls for bearings with a ball diameter of 3 mm to 50 mm: Silicon nitride is preferred for ceramic balls (Si3N4) made: Note 1: The requirements for pretreated ceramic ball silicon nitride materials are given in ISO 26602: The requirements for finished silicon nitride ceramic balls are given in ISO 3290-2: Note 2: See references for other ceramic ball strength determination methods: Poisson's ratio has a slight influence on the results of the strength test, so in the calculation, the typical silicon nitride ceramics used as bearing rolling elements are included in the The Poisson's ratio of the materials used ranged from 0:15 to 0:35: This test can also be used for ceramic balls made of other ceramic materials, but the previous coefficients in this document may not apply: Note 3: The method for determining the Poisson's ratio of isotropic materials is given in ISO 17561: Due to the brittle fracture properties of ceramic materials (affected by imperfections), test results may scatter significantly for a set of nominally identical samples: Note 4: Further statistical analysis methods are given in ISO 20501:

2 Normative references

The contents of the following documents constitute the essential provisions of this document through normative references in the text: Among them, dated references For documents, only the version corresponding to the date is applicable to this document; for undated reference documents, the latest version (including all amendments) is applicable to this document: ISO 463 Geometric product specification (GPS) Design and metrological characteristics of mechanical indicating gauges for dimensional measuring equipment Note: GB/T 39547-2020 Design and metrological characteristics of mechanical indicators (ISO 463:2006, IDT) ISO 3290-2 Rolling bearing balls Part 2: Ceramic balls (Rolingbearings-Bals-Part 2: Ceramicbals) Note: GB/T 308:2-2010 Rolling bearing balls Part 2: Ceramic balls (ISO 3290-2:2008, IDT) ISO 3611 Geometric product specification (GPS) Dimensional measuring equipment: Design and metrological characteristics of external micrometers [Geomet- Note: GB/T 6406-2016 Superabrasive particle size inspection (ISO 6106:2013, MOD) ISO 7500-1:2018 Inspection of static uniaxial testing machines for metallic materials - Part 1: Force measurement by tensile and/or compressive testing machines machines-Part 1: Tension/compression testing machines-Calibration and verification of the force-measuring system) Note: GB/T 16825:1-2008 Inspection of static uniaxial testing machines - Part 1: Inspection and calibration of force measuring systems of tensile and (or) compressive testing machines (ISO 7500-1:2004, IDT) ISO 20501 Weibull statistical analysis method for strength data of fine ceramics (advanced ceramics, advanced technical ceramics) [Fine Note: GB/T 40005-2021 Weibull statistical analysis method for strength data of fine ceramics (ISO 20501:2019, MOD) ......

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Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 42539-2023_English be delivered?

Answer: Upon your order, we will start to translate GB/T 42539-2023_English as soon as possible, and keep you informed of the progress. The lead time is typically 3 ~ 5 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 42539-2023_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 42539-2023_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.