GB/T 24635.4-2020 in English

VALID

Geometrical product specifications (GPS)—Coordinate measuring machines (CMM):Technique for determining the uncertainty of measurement—Part 4:Evaluating task-specific measurement uncertainty using simulation

Issued on:2020-12-14
Implemented on:2021-07-01
File Format:PDF
Delivery:Via email within 5 business days

Price(USD)： $430.00
$418.00

Standard No:	GB/T 24635.4-2020
Document status:	VALID
Title in English:	Geometrical product specifications (GPS)—Coordinate measuring machines (CMM):Technique for determining the uncertainty of measurement—Part 4:Evaluating task-specific measurement uncertainty using simulation
Title in Chinese:	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4部分：应用仿真技术评估特定任务的测量不确定度
Language:	English
File Format:	Electronic (PDF)
Delivery:	Via email within 5 business days
Issued on:	2020-12-14
Implemented on:	2021-07-01
ICS Classification:	17.040.10-Limits and fits
Chinese Classification:	J04-Basic standards and general methods
Professional Classification:	GB-National Standard
Related Keywords:	measurement uncertainty evaluating task-specific measurement uncertainty coordinate measuring machines measurement part actual measurement verification
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《GB/T 24635.4-2020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4部分：应用仿真技术评估特定任务的测量不确定度》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

Analysis of the core content of the standard

This part specifies the technical framework for evaluating the measurement uncertainty of specific tasks of coordinate measuring machines through simulation technology, mainly including:

UES software specification: requires the clarification of 13 types of declaration items such as applicable machine models, environmental conditions, and probe types
Input parameter requirements: the required input quantities and acquisition methods for the performance characterization of coordinate measuring machines need to be described in detail
GUM conformity: ensure that the uncertainty assessment complies with the requirements of the JJF1059.1 guideline

Comparison of key technical requirements

Elements	ISO/TS15530-4 requirements	GB/T 24635.4 adjustments
Reference Standards	ISO10360-1	Equivalent to GB/T16857.1
Uncertainty Assessment	GUM Guide	Replaced by JJF1059.1
Definition of Terms	ISO/IEC Guide 99	Adopting JJF1001-2011

Implementation Points and Case Studies

UES Verification Methods

Standard Appendix C details 4 types of verification methods:

Physical testing method: actual measurement verification using calibrated workpieces (Appendix D example)
Computer-aided verification: generating reference values by simulating the measurement process (Appendix E flow chart)
Long-term statistical study: accumulating historical data to evaluate stability (Appendix G data example)

A typical case shows that when measuring a three-leaf circle using 7 points, the uncertainty reported by UES should cover 95% of the measurement error.

Association with GPS matrix model

This standard belongs to the general GPS standard, affecting the six characteristic links of size, shape, position, etc. in the matrix model:

Measuring equipment link: Standardize the metrological characteristics of coordinate measuring machine
Calibration link: Provide standardized method for uncertainty assessment
Conformity determination link: Support the qualified determination rules of GB/T18779.1

More samples: GB 50021-2001(2009) JJG 21-2008 DL/T 368-2010

Sample only — not a preview of GB/T 24635.4-2020

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