GB/T 40681.7-2026Statistical methods in monitoring process capability and performance - Part 7: Capability of measurement processes (English PDF)

Foreword

This document complies with the provisions of GB/T 1.1-2020 "Standardization Work Guidelines Part 1: Structure and Drafting Rules of Standardization Documents".

Drafting.

This document is Part 7 of GB/T 40681, "Statistical Methods for Monitoring Production Process Capacity and Performance". GB/T 40681 has been published.

The following section.

---Part 2: Process Capability and Performance of Time-Dependent Process Models;

---Part 4: Process Capability Estimation and Performance Measurement;

---Part 5: Process Capability and Performance Estimation Based on Counting Characteristics;

---Part 6: Capacity Analysis of Multivariate Normal Processes;

---Part 7: Measurement Process Capability.

This document is a modified version of ISO 22514-7:2021 "Statistical methods in process management – Capability and performance – Part 7: Measurement processes".

ability".

The technical differences between this document and ISO 22514-7:2021, and the reasons therefor, are as follows.

---Replace ISO 3534-1 and ISO 3534-2 with the normatively referenced GB/T 3358.1 and GB/T 3358.2 respectively.

The referenced GB/T 6379 (all parts) replaces ISO 5725 (all parts), and the normative reference GB/T 27418-2017 is used.

Replace ISO/IEC Guide 98-3.2008 to adapt to my country's technical conditions and increase operability;

--- Symbols that did not appear in the main text of section 4.1 have been removed;

---Change t1-alpha2 in 4.1 to t1-alpha2,nu;

---Use the formula uMPE= in Tables 1 and 10 M2 PE1 3 ± M2 PE2 Change to M PE1 M2PE2

---The formula Cpreal= in 10.1 C2pobs-2.25·Q2MP changed to Cpreal=1/C2pobs-2.25·Q2MP;

---Change the null hypothesis under Table 13 in section 12.2 to an assumption about the population;

---The summation subscript for the test statistic in section 12.2 has been changed;

---Change "X" in step 5 of 12.3.3 to " ".

The following editorial changes have been made to this document.

---A note has been added in 9.3 to explain the meaning of Cp here;

---Incorporates the revisions from ISO 22514-7:2021/Amd1.2024;

---ISO 17450-2 has been replaced by GB/T 24637.2 (see Introduction and 5.1) for informational purposes;

---ISO 10360-2 has been replaced with GB/T 16857.2 (see 5.3.2) for informational reference;

---ISO 10360-5 has been replaced with GB/T 16857.5 (see 5.3.2) for informational reference;

---ISO 11095-2010 has been replaced by GB/T 22554-2010 (see 7.1.3.4, A.1.1, References);

---ISO 22514-2 has been replaced by GB/T 40681.2 (see 9.3), which is cited in the informational reference.

---ISO 2854 has been replaced by GB/T 4889-2008 (see B.1), which is cited as informative.

---Figure A.1 in Appendix A has been modified;

---The residuals in Appendix A.1.2 were changed to bias, and the data in Table A.2 were changed accordingly;

---The subscripts of some data in Table B.2 were changed, and "x" was changed to "y";

---The subscripts of certain symbols in Table B.3 have been changed.

Please note that some content in this document may involve patents. The issuing organization of this document assumes no responsibility for identifying patents.

This document was proposed and is under the jurisdiction of the National Technical Committee on Standardization of Statistical Methods Application (SAC/TC21).

Introduction

Process capability analysis is a commonly used statistical tool in statistical process control, used to describe whether a production or processing process meets product quality requirements.

Capacity. The GB/T 40681 series of standards, "Statistical Methods for Monitoring Production Process Capacity and Performance," is proposed to consist of eight parts.

---Part 1: General Principles and Concepts. This section aims to describe the fundamental principles governing the capability and performance of manufacturing processes.

---Part 2: Process Capability and Performance of Time-Dependent Process Models. The aim is to provide parameters for product or process characteristics when they are related to...

When time is relevant, this is a method for estimating the process capability or performance statistics of this characteristic.

---Part 3: Equipment Performance Study Based on Component Measurement Data. The aim is to provide data for continuous production of components under repetitive conditions.

A statistical method for the short-term process capability of equipment.

---Part 4: Process Capability Estimation and Performance Measurement. The purpose is to provide commonly used methods for measuring process capability and performance.

---Part 5: Process Capability and Performance Estimation of Counting Characteristics. The aim is to provide a method for calculating the process capability and performance of counting characteristics.

Methods for performance metrics.

---Part 6: Capability Analysis of Multivariate Normal Processes. The aim is to provide a set of process or product characteristics that follow a multivariate normal distribution.

Statistical methods for process performance and capability.

---Part 7: Measurement Process Capability. The purpose is to provide verification of whether the measurement system and process can meet specific measurement requirements.

program.

---Part 8: Equipment Performance Analysis of Multi-State Production Processes. The aim is to provide verification of the short-term capability of the production process, i.e., the equipment...

Methods for performance indexing.

The purpose of a measurement process is to generate measurement results based on the defined characteristics of a part or process. The capability of a measurement process is determined by the statistical properties of the measured values.

The measurements are obtained through a measurement process that operates in a predictable manner.

Capability and performance indices are calculated based on measurement results. Before ensuring these indices have practical significance, it is necessary to first analyze the...

The uncertainty is evaluated using the measurement process uncertainty. The actual measurement uncertainty should be kept within a sufficiently small range.

If the measurement process is used to determine whether a product characteristic conforms to a specification, then the uncertainty of the measurement process must be compared with the specification itself.

Comparison. If the measurement process is used for process control of a certain characteristic, then the uncertainty of the measurement process should be compared with the process variation (or process variation).

Compare the differences. For both cases, acceptable limits should be specified.

The quality of the measurement result is determined by the uncertainty of the measurement process. This uncertainty is based on the understanding of the measurement process and is determined by multiple measurements.

It is defined by statistical characteristics or estimated values of characteristics.

The method described in this document addresses the measurement uncertainty of measuring equipment (for more information on the measurement uncertainty of measuring equipment, see [link to document]).

GB/T 24637.2). Therefore, these are only valid when both the known method uncertainty and specification uncertainty are smaller than the measurement uncertainty of the measuring equipment.

This method is applicable only if the estimated uncertainty is known. This document describes a method for defining and calculating the capability index of a measurement process based on the estimated uncertainty. GB/T 27418 the method given in "Evaluation and Expression of Measurement Uncertainty" is the basis of this method.

Statistical methods for monitoring production process capacity and performance Part 7: Measurement Process Capability

1 Scope

This document specifies the verification procedures for measurement systems and processes, used to determine whether a given measurement process can meet a specific measurement task.

The requirement is to compare the defined capability index (CMS, CMP) or capability ratio (QMS, QMP) with the acceptance criteria.

Note. This document follows the technical approach of GB/T 27418, establishing a basic simplified procedure for evaluating the capability index of actual measurement processes, covering uncertainty.

The representation and synthesis methods of components.

This document is primarily applicable to simple one-dimensional measurement processes, and requires that both the known method uncertainty and specification uncertainty be lower than those of the measuring equipment.

The measurement uncertainty is small. It is also applicable to similar situations where process capability or performance is evaluated through measurement. This document is not applicable to complex...

Geometric measurement processes, such as the measurement of surface texture and position relying on multiple measurement points or simultaneous measurements in multiple directions.

2 Normative references

The contents of the following documents, through normative references within the text, constitute essential provisions of this document. Dated citations are not included.

For references to documents, only the version corresponding to that date applies to this document; for undated references, the latest version (including all amendments) applies.

This document.

GB/T 3358.1 Statistical vocabulary and symbols - Part 1: General statistical terminology and terminology used for probability (GB/T 3358.1-2009, ISO 3534-1:2006, IDT) GB/T 3358.2 Statistical vocabulary and symbols - Part 2: Applied statistics (GB/T 3358.2-2009, ISO 3534-2) 2006, IDT) GB/T 6379.1 Accuracy (Correctness and Precision) of Measurement Methods and Results - Part 1: General Principles and Definitions (GB/T 6379.1-2004, ISO 5725-1:1994, IDT) GB/T 6379.2 Accuracy (correctness and precision) of measurement methods and results - Part 2: Determining the repeatability of standard measurement methods Basic methods for sex and reproducibility (GB/T 6379.2-2004, ISO 5725-2:1994, IDT) GB/T 6379.3 Accuracy (Correctness and Precision) of Measurement Methods and Results - Part 3: Precision of Standard Measurement Methods Intermediate metrics (GB/T 6379.3-2012, ISO 5725-3:1994, IDT) GB/T 6379.4 Accuracy (Correctness and Precision) of Measurement Methods and Results - Part 4: Determining the Correctness of Standard Measurement Methods Basic methods for measuring (GB/T 6379.4-2006, ISO 5725-4:1994, IDT) GB/T 6379.5 Accuracy (Correctness and Precision) of Measurement Methods and Results - Part 5: Determining the Precision of Standard Measurement Methods Alternative methods for measuring degree (GB/T 6379.5-2006, ISO 5725-2:1998, IDT) GB/T 6379.6 Accuracy (Correctness and Precision) of Measurement Methods and Results - Part 6: Practical Application of Accuracy Values (GB/T 6379.6-2009, ISO 5725-6:1994, IDT) GB/T 27418-2017 Evaluation and expression of measurement uncertainty (ISO/IEC Guide 98-3.2008, MOD) Note. The content referenced in GB/T 27418-2017 is not technically different from the content referenced in ISO/IEC Guide 98-3.2008.

3 Terms and Definitions

The terms and definitions defined in GB/T 3358.1, GB/T 3358.2, and GB/T 6379 (all parts), as well as the following terms and definitions, apply to this document.