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GB/T 7308.3-2021Plain bearings - Thin-walled half bearings with or without flange - Part 3: Measurement of peripheral length (English PDF)

滑动轴承有法兰或无法兰薄壁轴瓦第3部分:周长测量

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Issued by

State Administration for Market Regulation, China National Standardization Administration

Level / Type

National · Recommended

Issue date

March 9, 2021

Implementation date

October 1, 2021

Scope

GB/T 7308.3-2021 is the English-translated version of 滑动轴承有法兰或无法兰薄壁轴瓦第3部分:周长测量.

GB/T 7308.3-2021 is the Chinese standard "Plain bearings - Thin-walled half bearings with or without flange - Part 3: Measurement of peripheral length".

Its scope clause reads: 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. Its clauses include terms and definitions.

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Document preview — GB/T 7308.3-2021

National Standard of the People's Republic of China

Classification: J 12

Issued by: State Administration for Market Regulation, China National Standardization Administration

Foreword
1 Scope
2 Normative references
3 Terms and definitions
4 Symbol
5 Inspection purpose
6 Inspection method
7 Selection and labeling of inspection methods
8 Measuring equipment
9 Technical requirements for measuring equipment
10 Measuring tools to determine the benchmark
11 Technical requirements for inspection mold
12 Requirements for calibration watts and comparison watts
13 Calibration value
14 Typical inspection procedures
15 State of the inspected bearing
16 Measurement error
17 Verification of the accuracy of the circumference compression under test load
18 Accuracy evaluation of inspection methods
19 Technical requirements on bearing drawings
20 Management requirements for inspection equipment
Appendix A (Normative Appendix) Determination of Calibration Values of Standard Inspection Modes-Method A
Appendix B (Normative Appendix) Determination of Calibration Value of Standard Inspection Mode---Method B
Appendix C (Normative Appendix) Determination of the calibration value of the work test model used alone
Appendix D (Normative Appendix) Determination of the calibration value of calibration watts or comparison watts
Appendix E (Normative Appendix) Repeatability, reproducibility and comparability testing and calculation
Appendix F (informative appendix) Verification method of circumference compression under measured load
Appendix G (informative appendix) Technical differences between this part and ISO 3548-3.2012 and their reasons

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).

GB/T 18329.1 | GB/T 2889.6 | GB/T 35087 | GB/T 2889.7 | GB/T 7948 | GB/T 7308.2 | […]

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This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 71 pages — is available in the English PDF.

Referenced standards

Normative references

ISO 3548 · ISO 12301.2007

Cited by

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