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GB/T 7308.3-2021: Plain bearings - Thin-walled half bearings with or without flange - Part 3: Measurement of peripheral length
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| GB/T 7308.3-2021 | English | 779 |
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Plain bearings - Thin-walled half bearings with or without flange - Part 3: Measurement of peripheral length
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GB/T 7308.3-2021
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Basic data | Standard ID | GB/T 7308.3-2021 (GB/T7308.3-2021) | | Description (Translated English) | Plain bearings - Thin-walled half bearings with or without flange - Part 3: Measurement of peripheral length | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J12 | | Word Count Estimation | 42,468 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | GB/T 7308.3-2021: Plain bearings - Thin-walled half bearings with or without flange - Part 3: Measurement of peripheral length
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Plain bearings - Thin-walled half bearings with or without flange - Part 3.Measurement of peripheral length
ICS 21.100.10
J12
National Standards of People's Republic of China
Sliding bearings have flanges or thin-walled bushes without flanges
Part 3.circumference measurement
(ISO 3548-3.2012,MOD)
Released on 2021-03-09
2021-10-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Table of contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Symbol 2
5 Inspection purpose 4
6 Inspection method 4
7 Selection and labeling of inspection methods 5
8 Measuring equipment 6
9 Technical requirements for measuring equipment 7
10 Measuring tools to determine the benchmark 8
11 Technical requirements for inspection mold 8
12 Requirements for calibration watts and comparison watts 13
13 Calibration value 15
14 Typical inspection procedures 16
15 State of the inspected bearing 17
16 Measurement error 17
17 Verification of the accuracy of the circumference compression under test load 18
18 Accuracy evaluation of inspection methods 18
19 Technical requirements on bearing drawings 20
20 Management requirements for inspection equipment 20
Appendix A (Normative Appendix) Determination of Calibration Values of Standard Inspection Modes-Method A 21
Appendix B (Normative Appendix) Determination of Calibration Value of Standard Inspection Mode---Method B 25
Appendix C (Normative Appendix) Determination of the calibration value of the work test model used alone 29
Appendix D (Normative Appendix) Determination of the calibration value of calibration watts or comparison watts 30
Appendix E (Normative Appendix) Repeatability, reproducibility and comparability testing and calculation 31
Appendix F (informative appendix) Verification method of circumference compression under measured load 33
Appendix G (informative appendix) Technical differences between this part and ISO 3548-3.2012 and their reasons 35
Foreword
GB/T 7308 ``Sliding bearings with flanges or thin-walled bearings without flanges'' is divided into the following three parts.
---Part 1.Tolerances, structural elements and inspection methods;
---Part 2.Measurement of bearing wall thickness and flange thickness;
---Part 3.Circumference measurement.
This part is Part 3 of GB/T 7308.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part uses the redrafting method to modify and adopt ISO 3548-3.2012 ``Sliding bearings with flanges or thin-walled bearings without flanges, Part 3
Minutes. Circumference Measurement.
Compared with ISO 3548-3.2012, this part has structural adjustments, adding Chapter 17 "Perimeter compression under inspection load"
"Verification of measurement accuracy" and Appendix F (informative appendix) "Verification method of circumference compression under measurement load".
Compared with ISO 3548-3.2012, there are technical differences in this part. The clauses involved in these differences have been passed through its outer margins.
The vertical single line (∣) is marked, and the corresponding technical differences and their reasons are listed in Appendix G.
This section also made the following editorial changes.
---The following symbols have been modified to be consistent with the symbols of GB/T 7308.1 and GB/T 7308.2.
● The symbol of higher degree is changed from a to h, aA to hA, and aB1 aB2 to hB;
● The symbol for the width of the flangeless bearing bush is changed from B to B1;
● The symbol of inspection die width (with flange bearing) is changed from B to Bcb1;
● The symbol for the width of the base of the inspection die is changed from B2 to Bcb2;
● The symbol of inspection die width (without flange bearing) is changed from B3 to Bcb3;
● The symbol of friction factor is changed from F to f;
● The width symbol of the flanged bearing bush except the flange thickness is changed from Z to B3 (including the symbols and dimensions in Figure 6, Table 7, and Table 10.
line);
● The wall thickness symbol on the top of the bearing bush is changed from stot to s3;
● The symbol of measurement uncertainty is changed from U to u;
● The sign of the fillet radius is changed from H to r.
---Corrected the error of the Hcb dimension guide line in Figure 6.
---Corrected the error of the Dms size guide line in Figure 7.
---Change the reproducibility condition 1 and condition 2 in Table 16, Table 17, E.2 to condition I and condition II, and the reproducibility calculation formula
|x1-x2| represents the difference between 1 and 2 of the measurement order.
--- In Appendix A, Figure A.1 and Figure A.6 are replaced with the text after the figure number is removed, and Figure A.2, Figure A.3, Figure A.4, and Figure A.5 are corrected in turn to
Figure A.1, Figure A.2, Figure A.3, Figure A.4.This adjustment corrected the original calculation format, the figure number in the calculation example, and the following figure.
The corresponding error.
---In Appendix B, Figure B.1 and Figure B.5 are replaced with the main text after the figure number is removed, and Figure B.2, Figure B.3, and Figure B.4 are sequentially corrected to Figure B.1, Figure B.2, and Figure B.4.
Figure B.3.This adjustment corrected the error that the calculation format in the original text and the figure number in the calculation example did not correspond to the following figure.
--- In E.1.5, Table 15 is corrected to Table 17, ISO original text is wrong.
--- In E.2, Table 14 is corrected to Table 16, and Table 15 is corrected to Table 17.The ISO original text is incorrect.
--- Added "Appendix F (informative appendix) verification method for circumference compression under measured load".
This part was proposed by China Machinery Industry Federation.
This part is under the jurisdiction of the National Sliding Bearing Standardization Technical Committee (SAC/TC236).
Drafting organizations of this section. China National Machinery Productivity Promotion Center, Yantai Dafeng Bearing Co., Ltd., Hangzhou Bearing Shijiazhuang Co., Ltd., Cheng
Dusheng Sanqiang Railway Fittings Co., Ltd., Lin'an Dongfang Sliding Bearing Co., Ltd.
This part is explained by the National Standardization Technical Committee of Sliding Bearings.
Sliding bearings have flanges or thin-walled bushes without flanges
Part 3.circumference measurement
1 Scope
This part of GB/T 7308 specifies the circumference measurement of flanged or non-flanged thin-walled bearings according to GB/T 27939, and explains all
The required inspection methods and measuring equipment.
The thin-walled bearing shell springs apart in a free state and is non-cylindrical. Therefore, the perimeter of the bearing bush can only be forced by special measuring equipment.
Measure under.
In addition, measurement equipment other than those shown in this section can also be used, but its measurement accuracy needs to be consistent with the provisions of Chapter 17.
This section applies to the measurement of flanged or flangeless thin-walled bearings, its specifications see GB/T 7308.1.
2 Normative references
The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article
Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document.
GB/T 7308.1 Thin-walled bearings with flanges or without flanges for sliding bearings-Part 1.Tolerances, structural elements and inspection methods
(GB/T 7308.1-2021, ISO 3548-1.2014, MOD)
GB/T 27939 Quality control technology and inspection of sliding bearing geometry and material quality characteristics (GB/T 27939-2011,
ISO 12301.2007, IDT)
3 Terms and definitions
The following terms and definitions apply to this document.
3.1
Peripherallength
The length of the circumference from one mating face to the other.
3.2
High degree of crushheight
Tight margin
Press the bearing bush with the specified inspection load F on the perimeter inspection die (hereinafter referred to as "inspection die") with a diameter of dcb and a height of Hcb
Among them, it exceeds the value of the theoretical perimeter of the die hole calibration.
see picture 1.
Note. In fact, the reference surface of the inspection mold is used as the reference for measuring h (see Figure 1).
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