JJF 1950-2021 English PDF

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JJF 1950-2021: Calibration Specification for Thread Gauge Scanners
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
JJF 1950-2021	379	Add to Cart	4 days	Calibration Specification for Thread Gauge Scanners	Valid

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Basic data

Standard ID: JJF 1950-2021 (JJF1950-2021)
Description (Translated English): Calibration Specification for Thread Gauge Scanners
Sector / Industry: Metrology & Measurement Industry Standard
Classification of Chinese Standard: A52
Word Count Estimation: 16,159
Issuing agency(ies): State Administration for Market Regulation

JJF 1950-2021: Calibration Specification for Thread Gauge Scanners

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Calibration Specification for Thread Gauge Scanners National Metrology Technical Specification of the People's Republic of China Specification for calibration of thread gauge scanning gauges Published on 2021-12-28 2022-06-28 Implementation Released by the State Administration for Market Regulation Specification for calibration of thread gauge scanning gauges Focal Point. National Technical Committee on Geometric Length Measurement Main drafting unit. China Institute of Metrology Participating in the drafting unit. Shenzhen Zhongtu Instrument Technology Co., Ltd. The Netherlands IAC Geometry Engineers This specification entrusts the National Technical Committee of Geometry and Length Measurement to be responsible for the interpretation The main drafters of this specification. Wang Weinong (China Institute of Metrology) Pei Limei (China Institute of Metrology) Ren Guoying (China Institute of Metrology) Wei Hengzheng (China Institute of Metrology) Participating drafters. Ma Junjie (Shenzhen Zhongtu Instrument Technology Co., Ltd.) ReginaldGalestien (The Netherlands IAC Geometry Engineers)

Table of contents

Introduction (Ⅱ) 1 Scope(1) 2 References (1) 3 Terms and Definitions(1) 4 Overview(1) 5 Metrology Characteristics(2) 6 Calibration Conditions(2) 6.1 Environmental conditions (2) 6.2 Standard for calibration (3) 7 Calibration items and calibration methods (3) 7.1 Preparations (3) 7.2 Radial measurement indication error ΔD (3) 7.3 Detection error(3) 7.4 Taper measurement indication error ΔTP, ΔTR (4) 7.5 Indication error of cone diameter measurement ΔTDP, ΔTDR (4) 7.6 Thread parameter measurement indication error (4) 8 Expression of calibration results (5) 9 Recalibration interval(5) Appendix A Raw Record Format(6) Appendix B Example of Format of Inside Page of Calibration Certificate(9) Appendix C Radial Measurement Indication Error Measurement Uncertainty Evaluation Example(10) Appendix D Recommended Standard Diameter Fitting Series(11)

Introduction

JJF 1071-2010 "Rules for the Compilation of National Metrology Calibration Standards", JJF 1001-2011 "General Metrology Terms and Definition" and JJF 1059.1-2012 "Measurement Uncertainty Evaluation and Representation" together constitute the revision of this calibration specification The basic series of specifications. This specification refers to GB/T 19600-2004 "Technical Specification for Product Geometric Quantity (GPS) Surface Structure Profile Method" The measurement characteristics and methods in "Calibration of Contact (Stylus) Instruments", combined with the working principle of the thread gauge scanning measuring instrument The combination and calibration method of the metrological characteristics are determined. This specification is published for the first time. Specification for calibration of thread gauge scanning gauges

1 Scope

This specification applies to the thread gauge scanning measuring instrument (hereinafter referred to as the thread scanner) calibration.

2 Reference documents

This specification references the following documents. JJF 1071-2010 Rules for Compilation of National Metrology and Calibration Specifications ISO 14253-1.2017 Technical Specification for Geometric Quantities of Products (GPS) Measurement Inspection of Workpieces and Measuring Equipment For dated references, only the dated version applies to this specification; for undated references The latest version (including all amendments) applies to this specification.

3 Terms and Definitions

3.1 Indication error of radial measurement The indication error of the thread scanner in the diameter direction of the thread gauge being measured. 3.2 Detection error When scanning an ideal straight line or curve, the size and shape indication error measured by the thread scanner. by measuring The dimensional measurement indication error and its variation of the quasi-cylinder at different positions are evaluated. 3.3 Indication error of taper measurement The thread scanner measures the indication error of the taper of the smooth cone gauge. Using the error of the diameter change over the specified length (mm/mm) expression. 3.4 Indication error of cone diameter measurement When the thread scanner measures the smooth cone gauge, the diameter at the installation base surface (large end face of ring gauge, small end face of plug gauge) indication error.

4 Overview

The thread scanner uses a fixture to position the thread gauge, so that the shaft section of the thread gauge and the probe of the thread scanner are aligned. The needle movement planes coincide. The probe scans the profile surface on the axial section of the thread gauge, and collects the scan trajectory of the probe. point set, and perform segmentation processing and mathematical calculation on the point set to obtain a single pitch diameter, pitch diameter, pitch, flank of the thread The data of parameters such as angle and taper can also obtain the value of the effective diameter. The size of the plane of motion of the probe depends on the radial and axial travel of the thread scanner. Depending on the design, probe, fixture configuration and software, the thread gauge size, ......

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