GB/T 34874.6-2020Geometrical product specifications (GPS)—X-ray three dimensional size measuring machines—Part 6: Testing method of workpieces (English PDF)
产品几何技术规范（GPS） X射线三维尺寸测量机 第6部分：工件的检测方法
This is a limited preview
Buy now to download the full PDF (15 pages)
Need quotation for your management?
Get a formal quotation for GB/T 34874.6-2020 in 30 minutes.
Issued by
SAMR; SAC
Level / Type
National · Recommended
Issue date
April 28, 2020
Implementation date
August 1, 2020
Scope
GB/T 34874.6-2020 is the English-translated version of 产品几何技术规范（GPS） X射线三维尺寸测量机 第6部分：工件的检测方法.
GB/T 34874.6-2020 is the Chinese standard "Geometrical product specifications (GPS)—X-ray three dimensional size measuring machines—Part 6: Testing method of workpieces".
Its scope clause reads: 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. Its clauses include terms and definitions; classification of detection tasks.
Found what you need?
Document preview — GB/T 34874.6-2020
National Standard of the People's Republic of China
- ICS
- 17.040.30
- Classification
- J 04
Issued by: State Administration for Market Regulation; Standardization Administration of the PRC
Contents
- Foreword
- 1 Scope
- 2 Normative references
- 3 Terms and definitions
- 4 Classification of detection tasks
- 5 Measurement procedure
- 5.1 Tomography imaging
- 5.2 3D image reconstruction
- 5.3 Contour extraction and surface reconstruction
- 5.4 Geometric size detection
- 5.5 Comparison of nominal and actual values
- 5.6 Wall thickness analysis
- 6 Workpiece size detection method
- 6.1 Overview
- 6.2 Device selection
- 6.3 Preparation for measurement
- 6.4 Measurement and analysis
- 6.5 Measurement report
- 6.6 Equipment verification
- Appendix A (informative appendix) Influencing factors of the testing process
- Appendix C (informative appendix) Relationship with GPS matrix model
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
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.
......
This preview omits tables, figures, formulas and parts of the technical clauses. The complete document — 15 pages — is available in the English PDF.
Similar standards
How to Download GB/T 34874.6-2020
- 1
Add to cart
Click "Download PDF" on this page and choose "Buy this standard". You can add more standards before checkout.
- 2
Checkout
Enter your email and billing details. Payment is processed securely by Stripe (cards or bank transfer). Prefer bank details? Request a quotation (min. order $300).
- 3
Instant delivery (0–9 sec)
Delivery is automatic: within seconds of payment you'll receive an email with a secure download link. The link stays valid for 72 hours.
- 4
Invoice included
A tax invoice is attached to the confirmation email. Need a custom invoice? Contact us.
Related Standards
GB/T 34874.1-2025 — Geometrical product specifications (GPS) - X-ray three dimensional size measuring machines - Part 1: Vocabulary
GB/T 34874.3-2017 — Geometrical product specifications (GPS)—X-ray three dimensional size measuring machines—Part 3: Acceptance and reverification tests
GB/T 34874.4-2025 — Geometrical product specifications (GPS) — X-ray three dimensional size measuring machines — Part 4: Evaluation of uncertainty in measurement
Secure payment via Stripe
Payments accepted
GB/T 34874.6-2020
$240.00