GB/T 25364.2-2021 in English
VALIDTurbocharger seal rings—Part 2:Inspection measuring principles
- Issued on:2021-12-31
- Implemented on:2022-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$156.00
《GB/T 25364.2-2021涡轮增压器密封环 第2部分：检验方法》由TC177（全国内燃机标准化技术委员会）归口，主管部门为中国机械工业联合会。
Introduction
Core changes in the standard revision
| Technical dimensions | 2010 version | 2021 version | Upgrade points |
|---|---|---|---|
| Test items | 7 items | 16 items | 9 new items such as light sealing and residual magnetic induction intensity |
| Measurement accuracy | H6 ring gauge | H5 ring gauge | Roundness requirement ≤0.0001d1 |
| Elasticity test | Single method | Steel belt/iron hoop dual method | Add digital display device requirement |
Details of key testing technologies
1. Light sealing test
Use standard ring gauge with 400-500lx illumination light source, and require the light transmission rate to be blocked ≥95%. Notes during testing:
- Ring gauge diameter tolerance H5
- Rotation is allowed to eliminate the influence of surface roughness
- Optical magnification equipment is prohibited
2. Innovation in elastic force measurement
| Parameters | Measurement method | Accuracy requirements |
|---|---|---|
| Tangential elastic force | Steel belt method/iron hoop method | ±0.5N |
| Radial elastic force | Specialized digital instrument | Stroke resolution 0.01mm |
Implementation suggestions
Enterprise Upgrade Path
- Equipment Transformation: Purchase H5-level standard ring gauges and digital dynamometers
- Testing Process: Establish a database for comparison before and after high-temperature tests
- Staff Training: Focus on training the 9 newly added testing methods
Technology Evolution Analysis
The 2021 version of the standard reflects three major trends: ① From static testing to operating condition simulation (new 600℃ high-temperature test) ② From geometric parameters to material properties (hardness disappearance rate) ③ From visual inspection to quantitative indicators (residual magnetic induction intensity). These changes respond to the technical requirements for the development of turbochargers to high speed (≥200,000 r/min) and high temperature (≥800℃) operating conditions.
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