GB/T 24635.1-2020 in English
VALIDGeometrical product specifications (GPS)—Coordinate measuring machines (CMM):Technique for determining the uncertainty of measurement—Part 1:Overview and metrological characteristics
- Issued on:2020-12-14
- Implemented on:2021-07-01
- File Format:PDF
- Delivery:Via email within 1~3 business days
$214.00
《GB/T 24635.1-2020产品几何技术规范（GPS） 坐标测量机（CMM） 确定测量不确定度的技术 第1部分：概要和计量特性》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
GB/T24635.1-2020, as the programmatic document of the uncertainty assessment series of standards for coordinate measuring machines, establishes the framework of the metrological characteristics system of coordinate measuring machines, and clarifies the three major source classifications of uncertainty for specific tasks:
- Measurement equipment factors: mechanical structure geometric errors, detection system errors, etc.
- Measurement planning factors: sampling strategies, algorithm selection, etc.
- External factors: ambient temperature, workpiece clamping, etc.
Analysis of the metrological characteristics system
| Characteristic type | Control elements | Calibration requirements |
|---|---|---|
| Basic metrological characteristics | Indication error, repeatability | Requires regular verification |
| Dynamic characteristics | Scanning speed response | Calibration according to frequency of use |
| Environmental adaptability | Temperature compensation accuracy | Calibration when the environment changes |
Comparison of uncertainty assessment technologies
Four key technologies recommended by the standard and their applicable scenarios:
- Sensitivity analysis method: Applicable to simple geometric feature measurement
- Multiple measurement strategy (GB/T24635.2): Reduce random errors through statistical methods
- Standard parts comparison method (GB/T24635.3): Suitable for routine detection with standard instruments
- Computer simulation (GB/T24635.4): Handle complex measurement scenarios
Implementation suggestions
Enterprise application path
It is recommended to establish a measurement uncertainty management system according to the following steps:
| 1. Equipment documentation | Record all metrological characteristic parameters of coordinate measuring machine |
| 2. Error source identification | Refer to Appendix B to establish an error source checklist |
| 3. Method selection | Select evaluation technology according to the complexity of the measurement task |
Automotive parts inspection case
In the measurement of the bore diameter of an engine cylinder, the standard ball calibration piece combined with simulation technology was used to reduce the uncertainty from ±3.2μm to ±1.8μm
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