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JJF 1839-2020 English PDF

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JJF 1839-2020: Calibration Specification for Tyre Uniformity Testing Machines
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Basic data

Standard ID JJF 1839-2020 (JJF1839-2020)
Description (Translated English) Calibration Specification for Tyre Uniformity Testing Machines
Sector / Industry Metrology & Measurement Industry Standard
Classification of Chinese Standard A53
Classification of International Standard 17.160
Word Count Estimation 17,157
Date of Issue 2020-07-02
Date of Implementation 2021-01-02
Quoted Standard GB/T 18506-2013; HG/T 4799-2015
Regulation (derived from) Announcement No. 29 (2020) of the State Administration for Market Regulation
Issuing agency(ies) State Administration for Market Regulation
Summary This standard applies to the calibration of car tires and truck tire uniformity testing machines (hereinafter referred to as testing machines).

JJF 1839-2020: Calibration Specification for Tyre Uniformity Testing Machines

---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 tire uniformity testing machine) National Metrology Technical Specifications of the People's Republic of China Calibration specification for tire uniformity testing machine 2020-07-02 released 2021-01-02 implementation Issued by the State Administration for Market Regulation Calibration specification for tire uniformity testing machine Focal point. National Technical Committee of Vibration and Shock Speed Measurement Main drafting unit. Zhongce Rubber Group Co., Ltd. Soft Control Co., Ltd. Double Star Group Co., Ltd. Beijing Rubber Industry Research and Design Institute Co., Ltd. Participated in the drafting unit. Fengshen Tire Co., Ltd. Wanli Tire Co., Ltd. Triangle Tire Co., Ltd. China National Accreditation Center for Conformity Assessment This specification entrusts the National Technical Committee of Vibration and Shock Speed Measurement to be responsible for the interpretation The main drafters of this specification. Liu Xinzhong (Zhongce Rubber Group Co., Ltd.) Yu Mingjin (Soft Control Co., Ltd.) Zang Yunhong (Double Star Group Co., Ltd.) Wang Xiguang (Beijing Rubber Industry Research and Design Institute Co., Ltd.) Participating drafters. Ji Xinsheng (Fengshen Tire Co., Ltd.) Li Guohua (Wanli Tire Co., Ltd.) Wang Bogang (Triangle Tire Co., Ltd.) Zhang Youwen (China National Accreditation Center for Conformity Assessment)

table of Contents

Introduction (Ⅱ) 1 scope (1) 2 Reference documents (1) 3 Terms and measurement units (1) 3.1 Uniformity (1) 3.2 Taper effect (1) 3.3 First harmonic of radial force (1) 3.4 First harmonic of lateral force (1) 4 Overview (1) 5 Measurement characteristics (2) 5.1 Test speed (2) 5.2 Test air pressure (2) 5.3 Force test system (2) 5.4 Repeatability of testing machine without tire removal (2) 5.5 Test machine tire unloading measurement repeatability (2) 6 Calibration conditions (3) 6.1 Environmental conditions (3) 6.2 Measurement standards or other equipment (3) 7 Calibration items and calibration methods (3) 7.1 Calibration of test speed (3) 7.2 Calibration of test air pressure (3) 7.3 Calibration of force test system (4) 7.4 Calibration of repeatability of testing machine without tire removal (4) 7.5 Calibration of test machine tire unloading measurement repeatability (5) 8 Calibration result expression (5) 9 Recalibration interval (6) Appendix A Calibration Record of Tire Uniformity Tester (7) Appendix B. Calibration certificate (calibration report) content (10) Appendix C Evaluation Example of Calibration Uncertainty of Indication Error of Force Test System (11)

Introduction

JJF 1001 "General Measurement Terms and Definitions", JJF 1059.1 "Measuring Uncertainty Evaluation and Expression", JJF 1071 "Rules for Compiling National Metrology and Calibration Specifications" and GB/T 6326 "Tire Terms and Definitions" together constitute The basic series of standards for the formulation of this specification. The main technical reference for the preparation of this specification is GB/T 18506-2013 "Automobile Tire Uniformity Test Method" and HG/T 4799-2015 "Tire Uniformity Inspection Machine". This specification is released for the first time. Calibration specification for tire uniformity testing machine

1 Scope

This specification applies to the calibration of car tires and truck tire uniformity testing machines (hereinafter referred to as testing machines).

2 Reference documents

This specification refers to the following documents. GB/T 18506-2013 Test method for uniformity of automobile tires HG/T 4799-2015 tire uniformity inspection machine For dated reference documents, only the dated version applies to this specification; for undated reference documents, The latest version (including all amendments) is applicable to this specification.

3 Terms and units of measurement

3.1 Uniformity Under static and dynamic conditions, tire circumferential characteristics are constant performance, including tire mass imbalance, dimensional deviation and force fluctuation. Note. The uniformity of this specification refers only to the fluctuation of tire force. [GB/T 18506-2013,3.1] 3.2 Taper effect The lateral force deviation that does not change the direction of the tire rotation. [GB/T 18506-2013,3.3] 3.3 First harmonic of radial force The maximum peak-to-peak value of the first harmonic of tire radial force fluctuations. [GB/T 18506-2013,3.5] 3.4 First harmonic of lateral force The maximum peak-to-peak value of the first harmonic of tire lateral force fluctuations. [GB/T 18506-2013,3.6]

4 overview

The testing machine is used for fully automatic measurement of the uniformity index of car tires and truck tires, and can realize the Tire classification. The testing machine is mainly composed of tire lubrication device, conveying device, testing device and so on. Working principle of testing machine Management. After the tire is loaded and inflated, the drum is close to the tire (or the tire is close to the drum) and a certain load is applied to it. Load, rotating the tire, due to factors such as the uneven material of the tire, causing the tire to produce fluctuations in radial force and lateral force. This fluctuation is measured by the load cell and converted into an electrical signal. Through continuous measurement of the electrical signal, the computer system The electrical signal is processed to obtain various parameters of uniformity, which are displayed and recorded by the system. The principle of the testing machine is shown in Figure 1.

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