GB/T 38761-2020 in English
VALIDGeometrical product specifications(GPS)—Characteristics and conditions—Definitions
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
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《GB/T 38761-2020产品几何技术规范（GPS） 特征和条件 定义》由TC240（全国产品几何技术规范标准化技术委员会）归口，主管部门为国家标准化管理委员会。
Introduction
Analysis of the core content of the standard
| Feature type | Definition points | Application scenarios |
|---|---|---|
| Independent feature | Shape, size, direction, and position do not affect each other | Single element quality control |
| Regional feature | Orientation feature in the form of maximum distance | Deviation control of non-ideal elements |
| Metrology feature | Dimension/gap evaluation based on assembly simulation | Functional assembly verification |
Technology evolution analysis
This standard is modified to adopt ISO 25378:2011. The main technical differences include:
- Referenced documents are replaced with equivalent national standards (such as GB/T 24637.1 replacing ISO 17450-1)
- Add localized application cases for typical elements such as cylindrical surface and plane
- Strengthen the application requirements of statistical tolerance in batch conditions
Implementation suggestions
Shape feature measurement process:Filter→fit→Evaluate maximum distance, it is recommended to use the least squares fitting criterion
Assembly feature selection:It is recommended to use metrology gap features for floating contact scenarios, and regional position features for fixed contact
Standard framework comparison
| Version | Core changes | Technical impact |
|---|---|---|
| ISO 25378:2011 | Definition of basic terms | Establish an international common framework |
| GB/T 38761-2020 | Add metrological feature classification | Strengthen assembly function verification |
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