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GBZ32332.2-2015: Rolling bearings—Explanatory notes on ISO 281—Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses
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| GB/Z 32332.2-2015 | English | 889 |
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Rolling bearings—Explanatory notes on ISO 281—Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses
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GB/Z 32332.2-2015
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Basic data | Standard ID | GB/Z 32332.2-2015 (GB/Z32332.2-2015) | | Description (Translated English) | Rolling bearings��Explanatory notes on ISO 281��Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses | | Sector / Industry | National Standard | | Classification of Chinese Standard | J11 | | Classification of International Standard | 21.100.20 | | Word Count Estimation | 42,445 | | Date of Issue | 2015-12-31 | | Date of Implementation | 2016-04-01 | | Regulation (derived from) | State Standard Announcement 2015 No.43 | | Issuing agency(ies) | General Administration of Quality Supervision, Inspection and Quarantine of the People's Republic of China, Standardization Administration of the People's Republic of China | GBZ32332.2-2015: Rolling bearings—Explanatory notes on ISO 281—Part 2: Modified rating life calculation, based on a systems approach to fatigue stresses
---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.
Rolling bearings-Explanatory notes on ISO 281-Part 2. Modified rating life calculation, based on a systems approach to fatigue
ICS 21.100.20
J11
People's Republic of China national standardization of technical guidance documents
Rolling bearing ISO 281 notes
Part 2. Based on fatigue stress system
Method of revision of rated life calculation
Rolingbearings-ExplanatorynotesonISO 281-Part 2.
Modifiedratinglifecalculation, basedonasystemsapproachofatiguestresses
(ISO /T R1281-2.2008, IDT)
2015-12-31 release
2016-04-01 implementation
General Administration of Quality Supervision, Inspection and Quarantine of People's Republic of China
China National Standardization Administration released
Directory
Foreword Ⅲ
Introduction IV
1 Scope 1
2 Normative references 1
3 symbol 1
4 reliability life correction coefficient a1 2
4.1 General 2
4.2 Derivation of reliability of life correction factor 2
5 life correction factor aISO background 5
5.1 General 5
5.2 Lubrication coefficient ηb 6
5.3 Pollution coefficient ηc 8
5.4 Test Results 11
5.5 Conclusion 14
5.6 According to the literature [5] formula (19.a), the practical application of pollution coefficient 14
5.7 Differences between the life correction factors in [5] and ISO 281 19
6 ISO 4406 used in A.4 and A.5 of ISO 281 [3] Background information on cleanliness code area 19
6.1 General 19
6.2 After filtering oil line 21
6.3 oil bath 21
6.4 oil mist pollution factor of 21
Effect of wear 22
7.1 Common definitions 22
7.2 Wear abrasive 22
7.3 slight wear 22
7.4 Wear on the fatigue life of 22
7.5 Fatigue with less effect on fatigue life 22
7.6 Adhesive wear 23
Effect of Corrosive Environment on Rolling Bearing Life 25
8.1 General 25
8.2 hydrogen on the impact of reduced life 25
8.3 Corrosion 26
9 sets of bearings fatigue load limit 28
Effect of bearing size 28
9.2 Calculation of roller bearing fatigue load limit, the fatigue load limit divided by the basic static load rating relationship 30
Effect of hoop stress, temperature and particle hardness on bearing life 31
10.1 Hoop stress 31
10.2 Temperature 31
10.3 Contamination Particle hardness 32
Relationships between κ and Λ
11.1 Viscosity ratio κ 32
11.2 Oil film thickness and the ratio of the integrated surface roughness Λ 32
Theoretical Calculation of 11.3 Λ
References 35
Foreword
GB /Z 32332 "Rolling on ISO 281 Notes" is divided into the following two parts.
--- Part 1. Basic dynamic load rating and basic rated life;
--- Part 2. Amendment of rated life calculation based on fatigue stress system method.
This section GB /Z 32332 Part 2.
This section drafted in accordance with GB/T 1.1-2009 given rules.
This section uses the translation method is equivalent to using ISO /T R1281-2.2008 "Bearing ISO 281 Notes Part 2
Revised rated life calculation for fatigue stress system method "and ISO /T R1281-2.2008/Cor.1.2009.
The documents of our country that are consistent with the corresponding international documents that are normative references in this section are as follows.
--- GB/T 18854-2002 Hydraulic fluid automatic particle counter calibration (ISO 11171.1999, MOD)
This section also made the following editorial changes.
--- Incorporation into the contents of the International Standard Technical Corrigendum ISO /T R1281-2.2008/Cor.1.2009, the provisions of these provisions have been passed
The vertical double line (║) over the margin of the outer margin is marked.
This part is proposed by China Machinery Industry Federation.
This part of the National Standardization Technical Committee Rolling Bearings (SAC/TC98) centralized.
This part of the drafting unit. Luoyang Bearing Research Institute Co., Ltd., Shanghai Fischer Bearing Technology Co., Ltd..
The main drafters of this section. Li Fei snow, Zhao Lianchun.
Introduction
Since the release of ISO 281.1990 [25], there have been many reports on contamination, lubrication, material fatigue loading limits, installation of internal stresses, quenching
Fire stress and other effects on bearing life knowledge. Therefore, it is now possible to consider more fully the factors that affect the fatigue load.
The practical application in this respect is given for the first time in ISO 281.1990/Amd.2.2000, which specifies how new knowledge should be harmonized
Is used in the life formula, but the disadvantage is that the effects of pollution and lubrication are given only in a general way. ISO 281.2007 This amendment alone
Incorporates and provides a practical way to account for the effects of lubrication conditions, contaminated lubricants, and the fatigue load on the bearing material on the bearing life.
This part of GB /Z 32332 compiles the background information used in the process of drafting ISO 281.2007 for reference and may be amended
ISO 281, to ensure the applicability of the standard.
Industry has long been confirmed, the use of the basic rating life L10 as a bearing performance criteria is satisfactory, the life expectancy is 90% reliability,
Commonly used high-quality materials, good processing quality and normal operating conditions related to life expectancy.
However, for many applications, people have begun to want to calculate the life expectancy at different levels of reliability and/or under specified lubrication and contamination conditions
Under more accurate life calculation. It has been found that the use of contemporary high quality bearing steels, under good operating conditions and rolling below a certain Hertz
Body contact stress operation, if not exceed the fatigue limit of the bearing steel, the bearing can reach much longer than L10 life. Conversely, if it is bad
Under operating conditions, the bearing life will be lower than the L10 life.
The systematic method of fatigue life calculation has been used in ISO 281.2007. The method attributed all the influence factors to the rolling elements
The additional stresses that occur at the contact points and below the contact areas can have an impact on the life of the system due to changes and interactions of related factors
Be considered.
Rolling bearing ISO 281 notes
Part 2. Based on fatigue stress system
Method of revision of rated life calculation
1 Scope
In addition to the reliability life correction factor a1, ISO 281.2007 also incorporates a life-time correction factor
aISO . These coefficients are used in amending the nominal life formula.
Lnm = a1aISO L10 (1)
ISO 281.2007 gives the value of a1 for a range of degrees of reliability and for the estimation of aISO based on the systematic method of correction
law. L10 is the basic rated life.
This section GB /Z 32332 gives additional background information on the derivation of a1 and aISO .
Note. The derivation of aISO is based primarily on the theory presented in [5], which also deals with the equivalence of the pollution coefficient eC to other factors considered when aISO is calculated
Complex theoretical background.
2 Normative references
The following documents for the application of this document is essential. For dated references, only the dated version applies to this article
Pieces. For undated references, the latest edition (including all amendments) applies to this document.
GB/T 6391-2010 Rolling bearings, rated dynamic load and rated life (ISO 281.2007, IDT)
ISO 11171 hydraulic drive fluid automatic particle counter calibration (Hydraulicfluidpower-Calibrationofauto-
maticparticlecountersforliquids)
3 symbol
The following symbols apply to this document. Some other symbols are specifically defined in the chapter or article they are used.
A. Proportional constant in the life formula derivation
aISO . Lifetime correction factor based on life-cycle calculation system approach
aSLF. The stress-life-span coefficient of the life-based computing system approach in [5] (as compared to the life-time correction coefficient aISO in ISO 281
with)
a1. reliability life correction factor
C. Basic dynamic load rating, N.
Cu. Fatigue load limit, N.
C0. Basic static load rating, N
c. Index in stress-life formula (c = 31/3 in [5] and ISO 281)
Dpw. Ball or roller set pitch diameter, mm
dV. Integral unit of volume, mm3
e Weibull index (ball bearings 10/9, 9/8 roller bearings)
eC. Pollution coefficient
Fr. Bearing radial load (bearing radial load component), N.
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