GB/T 34874.3-2017 in English
VALIDGeometrical product specifications (GPS)-X-ray three dimensional size measuring machines-Part 3:Acceptance and reverification tests
- Issued on:2017-11-01
- Implemented on:2018-05-01
- File Format:PDF
- Delivery:Via email within 5 business days
$301.00
《GB/T 34874.3-2017产品几何技术规范（GPS） X射线三维尺寸测量机 第3部分：验收检测和复检检测》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
GB/T 34874.3-2017 Standard Overview
GB/T 34874.3-2017 specifies the acceptance inspection and re-inspection inspection methods for three-dimensional dimension measuring machines based on the principle of X-ray computed tomography (CT), and is applicable to industrial CT measuring machines with three-dimensional geometric dimension measurement functions. The standard clarifies the metrological characteristics, detection errors, length measurement errors and their experimental inspection requirements.
Comparison of standard frameworks
| Dimensions | Description of content | Specification requirements |
|---|---|---|
| Metrology characteristics | Detection shape error, detection size error, full detection size error, length measurement error | Specify the maximum permissible error (MPE) value to ensure that the measurement accuracy meets the requirements |
| Testing conditions | Environmental conditions (temperature, humidity, vibration), operating conditions (equipment calibration, parameter setting) | Must meet the conditions specified in the manufacturer and user contract to ensure the validity of the test results |
| Measurement mode | Single field of view measurement mode (St), multi-field of view stitching measurement mode (Tr) | Test in different modes separately to ensure that the measurement error is within the allowable range |
Implementation suggestions
Case analysis: Practical application of shape error detection
During the detection process, 25 representative points on the standard sphere are selected, and the sphere is fitted using the least squares method. The difference between the maximum distance and the minimum distance is calculated as the detection shape error. For example, a standard sphere with a calibrated diameter is used to ensure that its surface roughness and shape error are both less than 20% of the maximum allowable error (P_F,MPE) of any specified shape detection.
Measurement uncertainty assessment
In actual detection, the uncertainty introduced by the standard, environmental factors, equipment calibration errors and the influence of software calculation methods need to be considered. The validity and reliability of the measurement results are ensured through the Class A and Class B assessment methods.
Technology evolution and standardization background
This standard is Part 3 of GB/T34874 "Product Geometry Technical Specification (GPS) X-ray Three-dimensional Dimension Measuring Machine", which follows the internationally accepted product quality inspection standards. Its formulation background is based on the rapid development of industrial CT measurement technology, aiming to unify the acceptance and re-inspection inspection methods to ensure the comparability and consistency of the measurement results.
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