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JJG 944-2013 English PDF

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JJG 944-2013: Verification Regulation of Metallic Webster Hardness Testing Machines
Status: Valid

JJG 944: Evolution and historical versions

Standard ID	Contents [version]	USD	STEP2	[PDF] delivered in	Standard Title (Description)	Status	PDF
JJG 944-2013	English	439	Add to Cart	4 days [Need to translate]	Verification Regulation of Metallic Webster Hardness Testing Machines	Valid	JJG 944-2013
JJG 944-1999	English	439	Add to Cart	4 days [Need to translate]	Verification Regulation of Metallic Webster Hardness Testing Machine	Obsolete	JJG 944-1999

PDF similar to JJG 944-2013

Standard similar to JJG 944-2013

JJG 882 GB/T 36126 GB/T 1885 JJG 126 JJG 948 JJG 942

Basic data

Standard ID	JJG 944-2013 (JJG944-2013)
Description (Translated English)	Verification Regulation of Metallic Webster Hardness Testing Machines
Sector / Industry	Metrology & Measurement Industry Standard
Classification of Chinese Standard	A53
Classification of International Standard	17.100
Word Count Estimation	19,159
Older Standard (superseded by this standard)	JJG 944-1999
Quoted Standard	JJG 113-2003; GB/T 4340.1
Regulation (derived from)	AQSIQ Announcement No. 74 of 2013
Issuing agency(ies)	General Administration of Quality Supervision, Inspection and Quarantine
Summary	This standard applies to: measurement range (0 ~ 20) HW metal Webster Hardness (hereinafter referred to as hardness) initial verification, testing and use of the follow-up examination.

JJG 944-2013: Verification Regulation of Metallic Webster Hardness 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.
Verification Regulation of Metallic Webster Hardness Testing Machines State verification procedures People's Republic of China Webster metal hardness tester Issued on. 2013-05-13 2013-11-13 implementation The State Administration of Quality Supervision, Inspection and Quarantine released Metal Webster Hardness test procedures Machines Replacing JJG 944-1999 Focal point. the National Technical Committee on Metering hardness force value The main drafting units. China Aviation Industry Corporation Beijing Great Wall Measurement and Testing Technology Institute The study China Institute of Metrology Shanghai Measurement and Testing Technology Research Institute Participated in the drafting. Changchun Research Institute of Machinery Co., Ltd. Shenyang Star Test Instrument Co., Ltd. This procedure hardness values measured force commissioned by the National Technical Committee is responsible for interpretation The main drafters of this procedure. Shi Wei (China Aviation Industry Corporation Beijing Great Wall Institute of Measurement and Testing Technology) Xu (China Aviation Industry Corporation Beijing Great Wall Institute of Measurement and Testing Technology) Zhang Feng (China Institute of Metrology) Yu Weiliang (Shanghai Institute of Measurement and Testing) Drafters participate. ROCKETS (Changchun Research Institute of Machinery Co., Ltd.) Zhang Fenglin (Shenyang Star Test Instrument Co., Ltd.)

Introduction (Ⅱ) 1 Scope (1) 2. References (1) 3 Overview (1) 3.1 Principle (1) 3.2 Structure and Type (1) 3.3 Purpose (2) 4 metering performance requirements (2) 4.1 hardness limit on the range of indication (2) 4.2 Performance measurement instruction means (2) 4.3 needle pressing (3) 4.4 hardness indication error and Repeatability (3) 5 General technical requirements (3) 5.1 Appearance (3) 5.2 General Performance (3) 5.3 The measurement instruction detecting means (4) 6 Control of measuring instruments (4) 6.1 Verification condition (4) 6.2 Verification of measuring instruments (4) 6.3 Verification Project (4) 6.4 Verification Methods (5) 7 test results processing (6) 8 test cycle (6) Appendix A standard technical requirements and Vickers hardness test blocks (7) Appendix B of aluminum alloy Webster hardness value (HWA) and Rockwell hardness (HRE) in terms of (9) Appendix C mild steel material Vickers hardness value (HWB) and Rockwell hardness (HRE) in terms of (10) Appendix D Webster Hardness test record format (11) Appendix E calibration certificate/test results in the notice page format (12)

Introduction

The regulations drafted in accordance with the rules JJF1002-2010 "national verification procedures write rules" given. The procedures in place JJG 944-1999 "Webster metal hardness tester", compared with JJG 944-1999, the main technical Changes are as follows. --- Increased introduction; --- References JJG 113-2003, GB/T 4340.1 and other documents (see Chapter 2); --- Modified formula (see 31, 1999 version 1.3.); --- The term "measuring indicator means" Replace the original term "indicator" (see 3.2 1, 1999 edition of 1.1); --- Increasing the instrument structure diagram, hardness type, main technical parameters and use (see 3.2.1 and 3.2.2); --- Canceled on "indenter displacement amount" of Technical Requirements (1999 edition 2.3); --- Increased "performance measurement indicating device" and "general performance" related to the technical requirements (see 4.2 and 5.2); --- Indication hardness test adds to the low hardness range indication testing requirements and revised the two adjacent indentation And the distance between the center and the center of the indentation hardness blocks from the edge of the technical specifications (see 6.4. 7.2, 1999 edition 4.7.2 and 4.7.3); --- Revised standard Vickers hardness test block surface roughness and surface parallel to the surface of the support of technical indicators; according to Durometer hardness range and type of provision of uniformity standard Vickers hardness block (see Appendix A, 1999 edition of attachment Record A); --- The "aluminum and aluminum alloys HW and HRE conversion table" to "aluminum alloy Webster hardness value (HW) and Luo Hardness value (HRE) conversion table "(see Appendix B, 1999 edition of Appendix B); --- The "hard and soft steel and aluminum HW HRE conversion table" to "soft steel Vickers hardness value (HW) and Rockwell Hardness value (HRE) conversion table "(see Appendix C, 1999 edition of Appendix C); --- Added Appendix D Webster Hardness test recording format; --- Increased appendix E Calibration Certificate page style; --- Added Appendix F test results in the notice page style. Metal Webster Hardness test procedures

1 Scope

The order applies to the measurement range (0 ~ 20) HW metal Webster Hardness (hereinafter referred to as hardness) of Initial verification, use and subsequent verification check. 2. References This procedure references the following documents. JJG 113-2003 standard metal Rockwell hardness block GB/T 4340.1 metallic materials - Vickers hardness test - Part 1. Test methods For dated references, only the dated edition applies to this procedure; undated reference documents Member, the latest edition (including any amendments) applies to this procedure.

3 Overview

3.1 Principle The basic principle of Vickers hardness test is the use of a shaped steel indenter, test force generated by the biasing spring Pressed into the surface of the sample, the pressure foot plane of bonding with the surface of the specimen closely, measuring the relative pressure needle pressure foot flat projecting length Degrees to 0.0125mm extension length represents a Vickers hardness units, symbols of HW. When the pressure needle projecting length When zero is defined as the full-scale 20HW, the Vickers hardness according to formula (1). HW = 20- L0.0125 (1) Where. HW --- Webster hardness, HW; L --- pressure needle extension length, mm. Note. "HW" is a common symbol Vickers hardness, specific Vickers hardness values depending on the hardness scale, respectively, with the symbol HWA and HWB shows hardness values A and B Webster hardness measurements. 3.2 Structure and Type 3.2.1 hardness structure Hardness, part of the urging spring, measuring devices, indicating mainly by the press pin, shown in Figure 1. 3.2.2 durometer type and technical parameters Hardness of the type, purpose and main technical parameters are shown in Table 1.

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