GB/T 38760-2020 in English
VALIDGeometrical product specifications(GPS)—Features utilized in specification and verification
- Issued on:2020-04-28
- Implemented on:2020-11-01
- File Format:PDF
- Delivery:Via email within 5 business days
$650.00
| Standard No: | GB/T 38760-2020 |
| Document status: | VALID |
| Title in English: | Geometrical product specifications(GPS)—Features utilized in specification and verification |
| Title in Chinese: | 产品几何技术规范(GPS) 规范和检验中使用的要素 |
| Language: | English |
| File Format: | Electronic (PDF) |
| Delivery: | Via email within 5 business days |
| Issued on: | 2020-04-28 |
| Implemented on: | 2020-11-01 |
| ICS Classification: | 17.040.30-Measuring instruments |
| Chinese Classification: | J04-Basic standards and general methods |
| Professional Classification: | GB-National Standard |
| Related Keywords: | nominal surface model → skin surface
surface model system geometrical product specifications skin surface model five-layer surface model architecture |
| Related Topics: | Product Geometry Technology
elements Elements English Product Geometry Specifications Calipers GBT38760 GB/T 38760-2020 Chinese drug inspection technology The difference between product specifications and inspection programs |
《GB/T 38760-2020产品几何技术规范（GPS） 规范和检验中使用的要素》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
Interpretation of the core content of the standard
This standard defines the common terminology system of workpiece geometric elements and establishes a complete concept chain from nominal surface models to actual inspection elements. The main technical breakthroughs include:
| Element type | Defining features | Application scenarios |
|---|---|---|
| Component elements | Actual surface or model part | Contact function analysis |
| Derived elements | Generated through center/offset operations | Benchmark establishment |
| Fitting elements | Ideal elements that meet constraints | Assembly simulation |
Analysis of key technologies
1. Surface model system
The standard establishes a five-layer surface model architecture: nominal surface model → Skin surface model→Discrete surface model→Sampling surface model→Actual surface. Among them:
- Nominal model: Ideal geometry defined by design (continuous infinite points)
- Skin surface model: Virtual representation of physical interface
- Discrete model: Finite point set + interpolation algorithm
2. New definition of dimensional elements
For the first time, the requirements of single parameter family and monotonic inhibition are clarified:
Example: When a ring is used as a dimensional element, the condition is met only when the cross-sectional diameter is changed with a fixed median diameter; if the cross-sectional diameter is changed with a fixed median diameter, the definition is not met.
Implementation Suggestions
Industrial Applications
- CAD systems need to support automatic generation of skeleton elements
- Measuring instruments should distinguish between algorithm differences between standard elements and inspection elements
Software Development
It is recommended to use object-oriented design to implement feature class inheritance relationships:
GeometricFeature ├─IdealFeature │ ├─SizeFeature │ └─SituationFeature └─NonIdealFeature ├─FilteredFeature └─RealFeature
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