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GB/T 34874.6-2020: Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 6: Testing method of workpieces
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Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 6: Testing method of workpieces
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GB/T 34874.6-2020
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Basic data | Standard ID | GB/T 34874.6-2020 (GB/T34874.6-2020) | | Description (Translated English) | Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 6: Testing method of workpieces | | Sector / Industry | National Standard (Recommended) | | Classification of Chinese Standard | J04 | | Classification of International Standard | 17.040.30 | | Word Count Estimation | 18,115 | | Date of Issue | 2020-04-28 | | Date of Implementation | 2020-08-01 | | Quoted Standard | GB/T 16857.1; GB/T 18779.1; GB/T 34874.3; GB/T 34881; JJF 1001 | | Issuing agency(ies) | State Administration for Market Regulation, China National Standardization Administration | | Summary | This standard specifies the method for workpiece inspection by X-ray three-dimensional measuring machine based on the principle of computed tomography (CT). This standard applies to industrial CT measuring machines with three-dimensional geometric dimension measurement functions. | GB/T 34874.6-2020: Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 6: Testing method of workpieces
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Geometrical product specifications (GPS)-X-ray three dimensional size measuring machines--Part 6. Testing method of workpieces
ICS 17.040.30
J04
National Standards of People's Republic of China
Product Geometric Technical Specification (GPS)
X-ray three-dimensional measuring machine
Part 6. Workpiece inspection methods
2020-04-28 release
2020-08-01 implementation
State Administration of Market Supervision and Administration
Issued by the National Standardization Management Committee
Contents
Foreword Ⅲ
1 Scope 1
2 Normative references 1
3 Terms and definitions 1
4 Classification of detection tasks 1
5 Measurement procedure 2
5.1 Tomography imaging 2
5.2 3D image reconstruction 2
5.3 Contour extraction and surface reconstruction 2
5.4 Geometric size detection 2
5.5 Comparison of nominal and actual values 3
5.6 Wall thickness analysis 3
6 Workpiece size detection method 3
6.1 Overview 3
6.2 Device selection 3
6.3 Preparation for measurement 3
6.4 Measurement and analysis 4
6.5 Measurement report 4
6.6 Equipment verification 4
Appendix A (informative appendix) Influencing factors of the testing process 5
Appendix B (informative appendix) The effect of the tested workpiece material on the detection results of the X-ray 3D dimension measuring machine 9
Appendix C (informative appendix) Relationship with GPS matrix model 11
Reference 12
Foreword
GB/T 34874 "Product Geometric Technical Specification (GPS) X-ray Three-dimensional Dimension Measuring Machine" is divided into 6 parts.
--- Part 1. Vocabulary;
--- Part 2. General technical requirements and applications;
--- Part 3. Acceptance testing and re-inspection testing;
--- Part 4. Evaluation of measurement uncertainty;
--- Part 5. Extraction and fitting of feature elements;
--- Part 6. Workpiece detection methods.
This part is Part 6 of GB/T 34874.
This section was drafted in accordance with the rules given in GB/T 1.1-2009.
This part is proposed and managed by the National Product Geometry Technical Standardization Technical Committee (SAC/TC240).
This section was drafted by. Guangdong Academy of Metrology, China Machine Productivity Promotion Center, China Academy of Metrology, Shandong Metrology
Academy of Sciences, Tianjin University, China Jiliang University, Carl Zeiss (Shanghai) Management Co., Ltd.
The main drafters of this section. Shi Yushu, Ming Cuixin, Zhang Xinyu, Cao Cong, Zhang Yong, Pi Lei, Zhang Shu, Hu Xiaodong, Zhao Jun, Hu Jiacheng, Han Dingzhong,
Zhu Yue.
Product Geometric Technical Specification (GPS)
X-ray three-dimensional measuring machine
Part 6. Workpiece inspection methods
1 Scope
This part of GB/T 34874 stipulates that the X-ray three-dimensional dimension measuring machine based on the principle of computer tomography (CT) performs the workpiece
Method of detection.
This section applies to industrial CT measuring machines with three-dimensional geometric measurement functions.
2 Normative references
The following documents are essential for the application of this document. For dated references, only the dated version applies to this article
Pieces. For the cited documents without date, the latest version (including all amendments) applies to this document.
GB/T 16857.1 Technical Specification for Geometrical Quantity of Products (GPS) Acceptance Testing and Re-inspection Testing of Coordinate Measuring Machines Part 1. Vocabulary
GB/T 18779.1 Technical Specification for Product Geometric Quantity (GPS) Measurement and Inspection of Workpieces and Measuring Equipment Part 1. Inspection according to specifications
Judgment rules for pass or fail
GB/T 34874.3 Product Geometric Technical Specification (GPS) X-ray 3D Dimensional Measuring Machine Part 3. Acceptance Inspection and Re-inspection
Testing
GB/T 34881 Product Geometric Technical Specification (GPS) Coordinate Measuring Machine Inspection Uncertainty Evaluation Guide
JJF1001 General Measurement Terms and Definitions
3 Terms and definitions
GB/T 16857.1, GB/T 18779.1, GB/T 34881 and JJF1001 and the following terms and definitions apply to this
file.
3.1
Dimensionalmeasurement
The geometric parameters of the workpiece geometry (for example, shape and position) are determined by measurement.
3.2
Nominal/actual value comparison nominal/actual value comparison
Digital-to-analog comparison
Compare the geometric characteristics of two data sets, one of which is used as a reference data set (nominal value), and the other is used as the evaluated data set (real
Interval).
3.3
Surface extraction
Surface composition process from CT voxel data.
4 Classification of detection tasks
When using X-ray three-dimensional size measuring machine to inspect the workpiece, the inspection tasks are classified based on the basic characteristics of the workpiece to be measured.
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