GB/T 7308.2-2021 in English
VALIDPlain bearings—Thin-walled half bearings with or without flange—Part 2:Measurement of wall thickness and flange thickness
- Issued on:2021-03-09
- Implemented on:2021-10-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$272.00
| Standard No: | GB/T 7308.2-2021 |
| Document status: | VALID |
| Title in English: | Plain bearings—Thin-walled half bearings with or without flange—Part 2:Measurement of wall thickness and flange thickness |
| Title in Chinese: | 滑动轴承 有法兰或无法兰薄壁轴瓦 第2部分：轴瓦壁厚和法兰厚度测量 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 1~3 business days |
| Issued on: | 2021-03-09 |
| Implemented on: | 2021-10-01 |
| ICS Classification: | 21.100.10-Plain bearings |
| Chinese Classification: | J12-Sliding bearing |
| Professional Classification: | GB-National Standard |
| Related Topics: | Flange test method
Thickness measurement bush GB/T 7308.2 GB/T 7308.2-2021 wall thickness Pipe wall thickness measurement Pipe wall thickness measuring instrument measurement requirements How to measure pollen polar and equatorial axes Motor shaft extension flange indian flange Thick wall bearing inspection |
《GB/T 7308.2-2021滑动轴承 有法兰或无法兰薄壁轴瓦 第2部分:轴瓦壁厚和法兰厚度测量》由TC236（全国滑动轴承标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Interpretation of the core content of the standard
GB/T7308.2-2021 is a special standard for the measurement of thin-walled bearings of sliding bearings, which focuses on standardizing the measurement technology system of wall thickness and flange thickness. This standard establishes a complete measurement methodology for flange bearings with an outer diameter of less than 250mm and flangeless bearings with an outer diameter of less than 500mm.
Key technical differences
| Comparison dimensions | ISO35482:2009 | GB/T7308.2-2021 |
|---|---|---|
| Scope of application | Flange types are not clearly distinguished | Flange (≤250mm)/no flange (≤500mm) |
| Measurement method | Uniform measurement system | Separate flange/no flange measurement chapter |
| Measuring equipment | Uncertainty limits are not specified | Added Table 6 classification limit requirements |
| Appendix content | Non-drawing marking specifications | New normative appendix A |
Measurement method system
1. Wall thickness measurement principle
Adopt the radial vertical measurement principle and obtain the minimum wall thickness value s3 through single/double-sided contact measurement. In special cases, it is necessary to avoid interference areas such as oil holes and markings. Typical cases include:
- Diesel engine bearings need to bypass the oil tank when measuring
- High-speed rail bearings need to deal with the steel back deformation area separately
2. Measurement method classification
| Method type | Applicable conditions | Distribution of measurement points |
|---|---|---|
| Circumferential line measurement | B1≤15mm single line, 15-90mm double line, >90mm three lines | Axial distance according to Table 2/3 |
| Axial line measurement | Preferably used for flangeless bearings | For Do≤150mm, use method A/B |
| Point measurement | For B≤90mm, take 3-6 points, for B>90mm, take 15 points | Angle α2=25° |
Key implementation points
- Equipment selection: Match the measuring head radius according to the requirements of Table 5 (metal lining 3±0.2mm, plastic lining 5±0.2mm)
- Load control: Maintain 0.8-2.5N measuring pressure according to GB/T27939, and take the lower limit for soft materials
- Uncertainty control:
- Do≤80mm: uε≤0.002mm
- 150-500mm: uε≤0.004mm
- Calibration cycle: It is recommended to verify the equipment every 500 measurements or 3 months
Technology evolution analysis
Compared with the 2009 version of the ISO standard, the main breakthroughs of this standard are reflected in:
- Reconstruction of measurement system: Separate the flange/flangeless bearing measurement methods to solve the measurement error caused by the mixed use of the original standards
- Quantification of equipment accuracy: The concept of measurement uncertainty limit is introduced for the first time to promote the upgrading of industry testing equipment
- Improvement of engineering adaptability: Through the drawing marking specifications in Appendix A, the standard requirements and production drawings are seamlessly connected
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